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• User Guide for Environmental Test Equipment

  Apr 26, 2025

  1. Basic Concepts Environmental test equipment (often referred to as "climate test chambers") simulates various temperature and humidity conditions for testing purposes.                                                                                    With the rapid growth of emerging industries such as artificial intelligence, new energy, and semiconductors, rigorous environmental testing has become essential for product development and validation. However, users often face challenges when selecting equipment due to a lack of specialized knowledge.   The following will introduce the basic parameters of the environmental test chamber, so as to help you make a better choice of products.   2. Key Technical Specifications (1) Temperature-Related Parameters 1. Temperature Range   Definition: The extreme temperature range in which the equipment can operate stably over long periods.   High-temperature range:  Standard high-temperature chambers: 200℃, 300℃, 400℃, etc.  High-low temperature chambers: High-quality models can reach 150–180℃. Practical recommendation: 130℃ is sufficient for most applications.   Low-temperature range: Single-stage refrigeration: Around -40℃. Cascade refrigeration: Around -70℃. Budget-friendly options: -20℃ or 0℃.                                         2. Temperature Fluctuation   Definition: The variation in temperature at any point within the working zone after stabilization.   Standard requirement: ≤1℃ or ±0.5℃.   Note: Excessive fluctuation can negatively impact other temperature performance metrics.   3. Temperature Uniformity   Definition: The maximum temperature difference between any two points in the working zone.   Standard requirement: ≤2℃.   Note: Maintaining this precision becomes difficult at high temperatures (>200℃).   4. Temperature Deviation   Definition: The average temperature difference between the center of the working zone and other points.   Standard requirement: ±2℃ (or ±2% at high temperatures).   5. Temperature Change Rate   Purchasing advice: Clearly define actual testing requirements. Provide detailed sample information (dimensions, weight, material, etc.). Request performance data under loaded conditions.(How many produce you going to test once?) Avoid relying solely on catalog specifications.   (2) Humidity-Related Parameters 1. Humidity Range   Key feature: A dual parameter dependent on temperature.   Recommendation: Focus on whether the required humidity level can be maintained stably.   2. Humidity Deviation   Definition: The uniformity of humidity distribution within the working zone.   Standard requirement: ±3%RH (±5%RH in low-humidity zones).   (3) Other Parameters 1. Airflow Speed   Generally not a critical factor unless specified by testing standards.   2. Noise Level   Standard values: Humidity chambers: ≤75 dB. Temperature chambers: ≤80 dB.   Office environment recommendations: Small equipment: ≤70 dB. Large equipment: ≤73 dB.   3. Purchasing Recommendations Select parameters based on actual needs—avoid over-specifying. Prioritize long-term stability in performance. Request loaded test data from suppliers. Verify the true effective dimensions of the working zone. Specify special usage conditions in advance (e.g., office environments).

  hot Tags : Climate Test Chamber Environmental Test Chamber) Reliability Testing Testing Cost Optimization Balance technical terms with buyer intent keywords emerging industry applications

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• Summary for LED Testing Conditions

  Apr 22, 2025

  What is LED? A Light Emitting Diode (LED) is a special type of diode that emits monochromatic, discontinuous light when a forward voltage is applied—a phenomenon known as electroluminescence. By altering the chemical composition of the semiconductor material, LEDs can produce near-ultraviolet, visible, or infrared light. Initially, LEDs were primarily used as indicator lights and display panels. However, with the advent of white LEDs, they are now also employed in lighting applications. Recognized as the new light source of the 21st century, LEDs offer unparalleled advantages such as high efficiency, long lifespan, and durability compared to traditional light sources. Classification by Brightness: Standard Brightness LEDs (made from materials like GaP, GaAsP) High-Brightness LEDs (made from AlGaAs) Ultra-High-Brightness LEDs (made from other advanced materials) ☆ Infrared Diodes (IREDs): Emit invisible infrared light and serve different applications.   LED Reliability Testing Overview: LEDs were first developed in the 1960s and were initially used in traffic signals and consumer products. It is only in recent years that they have been adopted for lighting and as alternative light sources. Additional Notes on LED Lifespan: The lower the LED junction temperature, the longer its lifespan, and vice versa. LED lifespan under high temperatures: 10,000 hours at 74°C 25,000 hours at 63°C As an industrial product, LED light sources are required to have a lifespan of 35,000 hours (guaranteed usage time). Traditional light bulbs typically have a lifespan of around 1,000 hours. LED streetlights are expected to last over 50,000 hours.                         LED Testing Conditions Summary: Temperature Shock Test Shock Temp. 1 Room Temp Shock Temp. 2 Recovery Time Cycles Shock Method Remarks -20℃(5 min) 2 90℃(5 min)   2 Gas Shock   -30℃(5 min) 5 105℃(5 min)   10 Gas Shock   -30℃(30 min)   105℃(30 min)   10 Gas Shock   88℃(20 min)   -44℃(20 min)   10 Gas Shock   100℃(30 min)   -40℃(30 min)   30 Gas Shock   100℃(15 min)   -40℃(15 min) 5 300 Gas Shock HB-LEDs 100℃(5 min)   -10℃(5 min)   300 Liquid Shock HB-LEDs   LED High-Temperature High-Humidity Test (THB Test) Temperature/Humidity Time Remarks 40℃/95%R.H. 96 Hour   60℃/85%R.H. 500 Hour LED Lifespan Testing 60℃/90%R.H. 1000 Hour LED Lifespan Testing 60℃/95%R.H. 500 Hour LED Lifespan Testing 85℃/85%R.H. 50 Hour   85℃/85%R.H. 1000 Hour LED Lifespan Testing   Room Temperature Lifespan Test 27℃ 1000 Hour Continuous illumination at constant current   High-Temperature Operating Life Test (HTOL Test) 85℃ 1000 Hour Continuous illumination at constant current 100℃ 1000 Hour Continuous illumination at constant current   Low-Temperature Operating Life Test (LTOL Test) -40℃ 1000 Hour Continuous illumination at constant current -45℃ 1000 Hour Continuous illumination at constant current   Solderability Test Test Condition Remarks The pins of the LED (1.6 mm away from the bottom of the colloid) are immersed in a tin bath at 260 °C for 5 seconds.   The pins of the LED (1.6 mm away from the bottom of the colloid) are immersed in a tin bath at 260+5 °C for 6 seconds.   The pins of the LED (1.6 mm away from the bottom of the colloid) are immersed in a tin bath at 300 °C for 3 seconds.     Reflow soldering oven test 240℃ 10 seconds   Environmental test (Conduct TTW solder treatment for 10 seconds at a temperature of 240 °C ± 5 °C) Test Name Reference Standard Refer to the content of the test conditions in JIS C 7021 Recovery Cycle Number (H) Temperature Cycling Automotive Specification -40 °C ←→ 100 °C, with a dwell time of 15 minutes  5 minutes 5/50/100 Temperature Cycling   60 °C/95% R.H, with current applied   50/100 Humidity Reverse Bias MIL-STD-883 Method 60 °C/95% R.H, 5V RB   50/100  

  hot Tags : Climate Test Chamber Thermal Shock Chamber Temperature and Humidity test for LED Rapid Thermal Cycling Chamber Simulation Chamber Aging Test Chamber

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• IEC 68-2-18 Test R and Guidance: Water Testing

  Apr 19, 2025

  Foreword The purpose of this test method is to provide procedures for evaluating the ability of electrical and electronic products to withstand exposure to falling drops (precipitation), impacting water (water jets), or immersion during transportation, storage, and use. The tests verify the effectiveness of covers and seals in ensuring that components and equipment continue to function properly during or after exposure to standardized water exposure conditions.   Scope  This test method includes the following procedures. Refer to Table 1 for the characteristics of each test.   Test Method Ra: Precipitation  Method Ra 1: Artificial Rainfall         This test simulates exposure to natural rainfall for electrical products placed outdoors without protection. Method Ra 2: Drip Box         This test applies to electrical products that, while sheltered, may experience condensation or leakage leading to water dripping from above.   Test Method Rb: Water Jets Method Rb 1: Heavy Rain         Simulates exposure to heavy rain or torrential downpours for products placed outdoors in tropical regions without protection. Method Rb 2: Spray         Applicable to products exposed to water from automatic fire suppression systems or wheel splash.            Method Rb 2.1: Oscillating Tube            Method Rb 2.2: Handheld Spray Nozzle Method Rb 3: Water Jet         Simulates exposure to water discharge from sluice gates or wave splash.   Test Method Rc: Immersion Evaluates the effects of partial or complete immersion during transportation or use.  Method Rc 1: Water Tank Method Rc 2: Pressurized Water Chamber   Limitations Method Ra 1 is based on natural rainfall conditions and does not account for precipitation under strong winds. This test is not a corrosion test. It does not simulate the effects of pressure changes or thermal shock.   Test Procedures General Preparation Before testing, specimens shall undergo visual, electrical, and mechanical inspections as specified in the relevant standards. Features affecting test results (e.g., surface treatments, covers, seals) must be verified. Method-Specific Procedures Ra 1 (Artificial Rainfall): Specimens are mounted on a support frame at a defined tilt angle (refer to Figure 1). Test severity (tilt angle, duration, rainfall intensity, droplet size) is selected from Table 2.  Specimens may be rotated (max. 270°) during testing. Post-test inspections check for water ingress. Ra 2 (Drip Box): Drip height (0.2–2 m), tilt angle, and duration are set per Table 3. Uniform dripping (200–300 mm/h) with 3–5 mm droplet size is maintained (Figure 4). Rb 1 (Heavy Rain): High-intensity rainfall conditions are applied per Table 4. Rb 2.1 (Oscillating Tube): Nozzle angle, flow rate, oscillation (±180°), and duration are selected from Table 5. Specimens rotate slowly to ensure full surface wetting (Figure 5). Rb 2.2 (Handheld Spray): Spray distance: 0.4 ± 0.1 m; flow rate: 10 ± 0.5 dm³/min (Figure 6). Rb 3 (Water Jet): Nozzle diameters: 6.3 mm or 12.5 mm; jet distance: 2.5 ± 0.5 m (Tables 7–8, Figure 7). Rc 1 (Water Tank): Immersion depth and duration follow Table 9. Water may include dyes (e.g., fluorescein) to detect leaks.  Rc 2 (Pressurized Chamber): Pressure and time are set per Table 10. Post-test drying is required.   Test Conditions Water Quality: Filtered, deionized water (pH 6.5–7.2; resistivity ≥500 Ω·m). Temperature: Initial water temperature within 5°C below specimen temperature (max. 35°C for immersion).   Test Setup  Ra 1/Ra 2: Nozzle arrays simulate rainfall/dripping (Figures 2–4). Fixtures must allow drainage.  Rb 2.1: Oscillating tube radius ≤1000 mm (1600 mm for large specimens). Rb 3: Jet pressure: 30 kPa (6.3 mm nozzle) or 100 kPa (12.5 mm nozzle).   Definitions Precipitation (Falling Drops): Simulated rain (droplets >0.5 mm) or drizzle (0.2–0.5 mm). Rainfall Intensity (R): Precipitation volume per hour (mm/h). Terminal Velocity (Vt): 5.3 m/s for raindrops in still air. Calculations:           Mean droplet diameter: D v≈1.71 R0.25 mm.             Median diameter: D 50 = 1.21 R 0.19mm.             Rainfall intensity: R = (V × 6)/(A × t) mm/h (where V = sample volume in cm³, A = collector area in dm², t = time in minutes).   Note: All tests require post-exposure inspections for water penetration and functional verification. Equipment specifications (e.g., nozzle types, flow rates) are critical for reproducibility.  

  hot Tags : Environmental Test Chamber Environmental Test Chamber Artificial Rainfall Test Environmental Test Chamber Spray Test Environmental Test Chamber Immersion Test Climate chamber Environmental Test Chamber IP Code Testing

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• IEC 68-2-66 Test Method Cx: Steady-State Damp Heat (Unpressurized Saturated Vapor)

  Apr 18, 2025

  Foreword   The purpose of this test method is to provide a standardized procedure for evaluating the resistance of small electrotechnical products (primarily non-hermetic components) by high and low temperature and humid environmental test chamber.     Scope   This test method applies to accelerated damp heat testing of small electrotechnical products.    Limitations   This method is not suitable to verify external effects for specimens, such as corrosion or deformation.     Test Procedure 1. Pre-Test Inspection   Specimens shall undergo visual, dimensional, and functional inspections as specified in the relevant standards.   2. Specimen Placement   Specimens shall be placed in the test chamber under laboratory conditions of temperature, relative humidity, and atmospheric pressure.   3.Bias Voltage Application (if applicable)   If bias voltage is required by the relevant standard, it shall be applied only after the specimen has reached thermal and humidity equilibrium.   4. Temperature and Humidity Ramp-Up   The temperature shall be raised to the specified value. During this period, air in the chamber shall be displaced by steam.   Temperature and relative humidity must not exceed specified limits.   No condensation shall form on the specimen.   Stabilization of temperature and humidity shall be achieved within 1.5 hours. If the test duration exceeds 48 hours and stabilization cannot be completed within 1.5 hours, it shall be achieved within 3.0 hours.   5. Test Execution   Maintain temperature, humidity, and pressure at specified levels as per the relevant standard.   The test duration begins once steady-state conditions are reached.   6. Post-Test Recovery   After the specified test duration, chamber conditions shall be restored to standard atmospheric conditions (1–4 hours).   Temperature and humidity must not exceed specified limits during recovery (natural cooling is permitted).   Specimens shall be allowed to fully stabilize before further handling.    7. In-Test Measurements (if required)   Electrical or mechanical inspections during the test shall be performed without altering test conditions.   No specimen shall be removed from the chamber before recovery.    8. Post-Test Inspection After recovery (2–24 hours under standard conditions), specimens shall undergo visual, dimensional, and functional inspections per the relevant standard.                                                                 ---   Test Conditions Unless otherwise specified, test conditions consist of temperature and duration combinations as listed in Table 1.   ---   Test Setup 1. Chamber Requirements   A temperature sensor shall monitor chamber temperature.   Chamber air shall be purged with water vapor before testing.   Condensate must not drip onto specimens.     2. Chamber Materials Chamber walls shall not degrade vapor quality or induce specimen corrosion.     3. Temperature Uniformity Total tolerance (spatial variation, fluctuation, and measurement error): ±2°C.   To maintain relative humidity tolerance (±5%), temperature differences between any two points in the chamber shall be minimized (≤1.5°C), even during ramp-up/down.     4. Specimen Placement Specimens must not obstruct vapor flow.   Direct radiant heat exposure is prohibited.   If fixtures are used, their thermal conductivity and heat capacity shall be minimized to avoid affecting test conditions.   Fixture materials must not cause contamination or corrosion.     3. Water Quality   Use distilled or deionized water with:   Resistivity ≥0.5 MΩ·cm at 23°C.   pH 6.0–7.2 at 23°C.   Chamber humidifiers shall be cleaned by scrubbing before water introduction.     ---   Additional Information Table 2 provides saturated steam temperatures corresponding to dry temperatures (100–123°C).   Schematic diagrams of single-container and double-container test equipment are shown in Figures 1 and 2.   ---   Table 1: Test Severity | Temp. (°C) | RH (%) | Duration (h, -0/+2) |   temperature relative humidity Time (hours, -0/+2) ±2℃ ±5% Ⅰ Ⅱ Ⅲ 110 85 96 192 408 120 85 48 96 192 130 85 24 48 96 Note: Vapor pressure at 110°C, 120°C, and 130°C shall be 0.12 MPa, 0.17 MPa, and 0.22 MPa, respectively.    ---   Table 2: Saturated Steam Temperature vs. Relative Humidity   (Dry temperature range: 100–123°C) Saturation Temp(℃) Relative Humidity(%RH) 100% 95% 90% 85% 80% 75% 70% 65% 60% 55% 50% Dry Temp (℃)                         100   100.0 98.6 97.1 95.5 93.9 92.1 90.3 88.4 86.3 84.1 81.7 101   101.0 99.6 98.1 96.5 94.8 93.1 91.2 89.3 87.2 85.0 82.6 102   102.0 100.6 99.0 97.5 95.8 94.0 92.2 90.2 88.1 85.9 83.5 103   103.0 101.5 100.0 98.4 96.8 95.0 93.1 92.1 89.0 86.8 84.3 104   104.0 102.5 101.0 99.4 97.7 95.9 94.1 92.1 90.0 87.7 85.2 105   105.0 103.5 102.0 100.4 98.7 96.9 95.0 93.0 90.9 88.6 86.1 106   106.0 104.5 103.0 101.3 99.6 97.8 96.0 93.9 91.8 89.5 87.0 107   107.0 105.5 103.9 102.3 100.6 98.8 96.9 94.9 92.7 90.4 87.9 108   108.0 106.5 104.9 103.3 101.6 99.8 97.8 95.8 93.6 91.3 88.8 109   109.0 107.5 105.9 104.3 102.5 100.7 98.8 96.7 94.5 92.2 89.7 110   110.0 108.5 106.9 105.2 103.5 101.7 99.7 97.7 95.5 93.1 90.6 (Additional columns for %RH and saturated temp. would follow as per original table.)    ---   Key Terms Clarified: "Unpressurized saturated vapor": High-humidity environment without external pressure application.   "Steady-state": Constant conditions maintained throughout the test.  

  hot Tags : Test Chamber Temperature Sensor Damp Heat Test Chamber Temperature & Humidity Test Chamber Single-container/Double-container Equipment Accelerated Damp Heat Test

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• Constant Temperature and Humidity Chamber Selection Guide

  Apr 06, 2025

  Dear Valued Customer,   To ensure you select the most cost-effective and practical equipment for your needs, please confirm the following details with our sales team before purchasing our products:   Ⅰ. Workspace Size The optimal testing environment is achieved when the sample volume does not exceed 1/5 of the total chamber capacity. This ensures the most accurate and reliable test results.   Ⅱ. Temperature Range & Requirements Specify the required temperature range. Indicate if programmable temperature changes or rapid temperature cycling is needed. If yes, provide the desired temperature change rate (e.g., °C/min).   Ⅲ. Humidity Range & Requirements Define the required humidity range. Indicate if low-temperature and low-humidity conditions are needed. If humidity programming is required, provide a temperature-humidity correlation graph for reference.   Ⅳ. Load Conditions Will there be any load inside the chamber? If the load generates heat, specify the approximate heat output (in watts).   Ⅴ. Cooling Method Selection Air Cooling – Suitable for smaller refrigeration systems and general lab conditions. Water Cooling – Recommended for larger refrigeration systems where water supply is available, offering higher efficiency.    The choice should be based on lab conditions and local infrastructure.                                                 Ⅵ. Chamber Dimensions & Placement Consider the physical space where the chamber will be installed. Ensure the dimensions allow for easy access room, transportation, and maintenance.   Ⅶ. Test Shelf Load Capacity If samples are heavy, specify the maximum weight requirement for the test shelf.   Ⅷ. Power Supply & Installation Confirm the available power supply (voltage, phase, frequency). Ensure sufficient power capacity to avoid operational issues.   Ⅹ. Optional Features & Accessories     Our standard models meet general testing requirements, but we also offer: 1.Customized fixtures 2.Additional sensors 3.Data logging systems 4.Remote monitoring capabilities 5.Specify any special accessories or spare parts needed.   Ⅺ. Compliance with Testing Standards Since industry standards vary, please clearly specify the applicable testing standards and clauses when placing an order. Provide detailed temperature/humidity points or special performance indicators if required.   Ⅺ. Other Custom Requirements If you have any unique testing needs, discuss them with our engineers for tailored solutions.   Ⅻ. Recommendation: Standard vs. Custom Models Standard models offer faster delivery and cost efficiency. However, we also specialize in custom-built chambers and OEM solutions for specialized applications.   For further assistance, contact our sales team to ensure the best configuration for your testing requirements.                                                                                                                                 GUANGDONG LABCOMPANION LTD                                                                                                                      Precision Engineering for Reliable Testing

  hot Tags : Thermal Cycling Test Chamber Environmental Test Chamber Constant Temperature and Humidity Chamber Programmable Temperature and Humidity Chamber Custom Environmental Testing Equipment Temperature and Humidity Stability Chamber

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• Precautions for Using an Oven in the Studio

  Mar 22, 2025

  An oven is a device that uses electric heating elements to dry objects by heating them in a controlled environment. It is suitable for baking, drying, and heat treatment within a temperature range of 5°C to 300°C (or up to 200°C in some models) above room temperature, with a typical sensitivity of ±1°C. There are many models of ovens, but their basic structures are similar, generally consisting of three parts: the chamber, the heating system, and the automatic temperature control system. The following are the key points and precautions for using an oven:   Ⅰ. Installation: The oven should be placed in a dry and level area indoors, away from vibrations and corrosive substances.   Ⅱ. Electrical Safety: Ensure safe electrical usage by installing a power switch with sufficient capacity according to the oven's power consumption. Use adequate power cables and ensure a proper grounding connection.   Ⅲ. Temperature Control: For ovens equipped with a mercury contact thermometer-type temperature controller, connect the two leads of the contact thermometer to the two terminals on the top of the oven. Insert a standard mercury thermometer into the vent valve (this thermometer is used to calibrate the contact thermometer and monitor the actual temperature inside the chamber). Open the vent hole and adjust the contact thermometer to the desired temperature, then tighten the screw on the cap to maintain a constant temperature. Be careful not to rotate the indicator beyond the scale during adjustment.   Ⅳ. Preparation and Operation: After all preparations are complete, place the samples inside the oven, connect the power supply, and turn it on. The red indicator light will illuminate, indicating that the chamber is heating up. When the temperature reaches the set point, the red light will turn off and the green light will turn on, indicating that the oven has entered the constant temperature phase. However, it is still necessary to monitor the oven to prevent temperature control failure.   Ⅴ. Sample Placement: When placing samples, ensure they are not too densely packed. Do not place samples on the heat dissipation plate, as this may obstruct the upward flow of hot air. Avoid baking flammable, explosive, volatile, or corrosive substances.   Ⅵ. Observation: To observe the samples inside the chamber, open the outer door and look through the glass door. However, minimize the frequency of opening the door to avoid affecting the constant temperature. Especially when working at temperatures above 200°C, opening the door may cause the glass to crack due to sudden cooling.   Ⅶ. Ventilation: For ovens with a fan, ensure the fan is turned on during both the heating and constant temperature phases. Failure to do so may result in uneven temperature distribution within the chamber and damage to the heating elements.   Ⅷ. Shutdown: After use, promptly turn off the power supply to ensure safety.   Ⅸ. Cleanliness: Keep the interior and exterior of the oven clean.   Ⅹ. Temperature Limit: Do not exceed the maximum operating temperature of the oven.   XI. Safety Measures: Use specialized tools to handle samples to prevent burns.   Additional Notes:   1.Regular Maintenance: Periodically inspect the oven's heating elements, temperature sensors, and control systems to ensure they are functioning correctly.   2.Calibration: Regularly calibrate the temperature control system to maintain accuracy.   3.Ventilation: Ensure the studio has adequate ventilation to prevent the buildup of heat and fumes.   4.Emergency Procedures: Familiarize yourself with emergency shutdown procedures and keep a fire extinguisher nearby in case of accidents.   By adhering to these guidelines, you can ensure the safe and effective use of an oven in your studio.

  hot Tags : Laboratory Precision Drying Oven Industrial High-Temperature Heating Oven Electric Temperature Controlled Oven Digital Forced Convection Oven Vacuum Laboratory Drying Oven Programmable Hot Air Circulation Oven

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• Accelerated Environmental Testing Technology

  Mar 21, 2025

  Traditional environmental testing is based on the simulation of real environmental conditions, known as environmental simulation testing. This method is characterized by simulating real environments and incorporating design margins to ensure the product passes the test. However, its drawbacks include low efficiency and significant resource consumption.   Accelerated Environmental Testing (AET) is an emerging reliability testing technology. This approach breaks away from traditional reliability testing methods by introducing a stimulation mechanism, which significantly reduces testing time, improves efficiency, and lowers testing costs. The research and application of AET hold substantial practical significance for the advancement of reliability engineering.   Accelerated Environmental Testing Stimulation testing involves applying stress and rapidly detecting environmental conditions to eliminate potential defects in products. The stresses applied in these tests do not simulate real environments but are instead aimed at maximizing stimulation efficiency.   Accelerated Environmental Testing is a form of stimulation testing that employs intensified stress conditions to assess product reliability. The level of acceleration in such tests is typically represented by an acceleration factor, defined as the ratio of a device's lifespan under natural operating conditions to its lifespan under accelerated conditions.   The stresses applied can include temperature, vibration, pressure, humidity (referred to as the "four comprehensive stresses"), and other factors. Combinations of these stresses are often more effective in certain scenarios. High-rate temperature cycling and broadband random vibration are recognized as the most effective forms of stimulation stress. There are two primary types of accelerated environmental testing: Accelerated Life Testing (ALT) and Reliability Enhancement Testing (RET).   Reliability Enhancement Testing (RET) is used to expose early failure faults related to product design and to determine the product's strength against random failures during its effective lifespan. Accelerated Life Testing aims to identify how, when, and why wear-out failures occur in products.   Below is a brief explanation of these two fundamental types.   1. Accelerated Life Testing (ALT) : Environmental Test Chamber Accelerated Life Testing is conducted on components, materials, and manufacturing processes to determine their lifespan. Its purpose is not to expose defects but to identify and quantify the failure mechanisms that lead to product wear-out at the end of its useful life. For products with long lifespans, ALT must be conducted over a sufficiently long period to estimate their lifespan accurately.   ALT is based on the assumption that the characteristics of a product under short-term, high-stress conditions are consistent with those under long-term, low-stress conditions. To shorten testing time, accelerated stresses are applied, a method known as Highly Accelerated Life Testing (HALT).   ALT provides valuable data on the expected wear mechanisms of products, which is crucial in today's market, where consumers increasingly demand information about the lifespan of the products they purchase. Estimating product lifespan is just one of the uses of ALT. It enables designers and manufacturers to gain a comprehensive understanding of the product, identify critical components, materials, and processes, and make necessary improvements and controls. Additionally, the data obtained from these tests instills confidence in both manufacturers and consumers.   ALT is typically performed on sampled products.   2. Reliability Enhancement Testing (RET) Reliability Enhancement Testing goes by various names and forms, such as step-stress testing, stress life testing (STRIEF), and Highly Accelerated Life Testing (HALT). The goal of RET is to systematically apply increasing levels of environmental and operational stress to induce failures and expose design weaknesses, thereby evaluating the reliability of the product design. Therefore, RET should be implemented early in the product design and development cycle to facilitate design modifications.     Researchers in the field of reliability noted in the early 1980s that significant residual design defects offered considerable room for reliability improvement. Additionally, cost and development cycle time are critical factors in today's competitive market. Studies have shown that RET is one of the best methods to address these issues. It achieves higher reliability compared to traditional methods and, more importantly, provides early reliability insights in a short time, unlike traditional methods that require prolonged reliability growth (TAAF), thereby reducing costs.

  hot Tags : Environmental Test Chamber AET chamber Four Comprehensive Stresses chamber Product Reliability Evaluation QUV Accelerated Weathering Tester Environmental Stress Screening

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• HUMIDITY & TEMPERATURE TEST CHAMBER OPERATIONAL GUIDELINES

  Mar 19, 2025

  1.Equipment Overview The Humidity & Temperature Test Chamber, also known as an Environmental Simulation Testing Apparatus, is a precision instrument requiring strict adherence to operational protocols. As a Class II electrical device compliant with IEC 61010-1 safety standards, its reliability (±0.5°C temperature stability), precision (±2% RH humidity accuracy), and operational stability are critical for obtaining ISO/IEC 17025 compliant test results. 2.Pre-Operation Safety Protocols 2.1 Electrical Requirements  Power supply: 220V AC ±10%, 50/60Hz with independent grounding (ground resistance ≤4Ω)  Install emergency stop circuit and overcurrent protection (recommended 125% of rated current)  Implement RCD (Residual Current Device) with tripping current ≤30mA 2.2 Installation Specifications  Clearance requirements:        Rear: ≥500mm        Lateral: ≥300mm        Vertical: ≥800mm  Ambient conditions:       Temperature: 15-35°C       Humidity: ≤85% RH (non-condensing)       Atmospheric pressure: 86-106kPa     3.Operational Constraints 3.1 Prohibited Environments  Explosive atmospheres (ATEX Zone 0/20 prohibited)  Corrosive environments (HCl concentration >1ppm)  High particulate areas (PM2.5 >150μg/m³) Strong electromagnetic fields (>3V/m at 10kHz-30MHz) 4.Commissioning Procedures 4.1 Pre-Start Checklist  Verify chamber integrity (structural deformation ≤0.2mm/m)  Confirm PT100 sensor calibration validity (NIST traceable)  Check refrigerant levels (R404A ≥85% of nominal charge)  Validate drainage system slope (≥3° gradient) 5.Operational Guidelines 5.1 Parameter Setting  Temperature range: -70°C to +150°C (gradient ≤3°C/min)  Humidity range: 20% RH to 98% RH (dew point monitoring required >85% RH)  Program steps: ≤120 segments with ramp soak control  5.2 Safety Interlocks  Door-open shutdown (activation within 0.5s)  Over-temperature protection (dual redundant sensors)  Humidity sensor failure detection (auto-dry mode activation) 6.Maintenance Protocol 6.1 Daily Maintenance  Condenser coil cleaning (compressed air 0.3-0.5MPa)  Water resistivity check (≥1MΩ·cm)  Door seal inspection (leak rate ≤0.5% vol/h)  6.2 Periodic Maintenance  Compressor oil analysis (every 2,000 hours)  Refrigerant circuit pressure test (annual)  Calibration cycle:         Temperature: ±0.3°C (annual)         Humidity: ±1.5% RH (biannual) 7.Failure Response Matrix Symptom Priority Priority Immediate Action Technical Response Uncontrolled heating P1 Activate emergency stop Check SSR operation (Vf <1.5V) Humidity oscillation P2 Initiate auto-dry cycle Verify dew point sensor calibration Condenser frost P3 Reduce humidity setpoint Check expansion valve (ΔT 5-8°C) Water level alarm P2 Refill with DI water Conduct float switch resistance test 8.Decommissioning & Disposal  Refrigerant recovery per EPA 608 regulations  PCB disposal compliant with RoHS Directive 2011/65/EU  Steel components recycling (≥95% recovery rate) 9.Compliance Standards  Safety: UL 61010-2-011, EN 60204-1  EMC: FCC Part 15 Subpart B, EN 55011  Performance: ASTM D4332, IEC 60068-3-5  

  hot Tags : Constant Temperature and Humidity Test Chamber Safe Operation for chamber Troubleshooting for chamber Calibration and Inspection for chamber Electrical Safety of chamber

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• Environmental Testing Methods

  Mar 15, 2025

  "Environmental testing" refers to the process of exposing products or materials to natural or artificial environmental conditions under specified parameters to evaluate their performance under potential storage, transportation, and usage conditions. Environmental testing can be categorized into three types: natural exposure testing, field testing, and artificial simulation testing. The first two types of testing are costly, time-consuming, and often lack repeatability and regularity. However, they provide a more accurate reflection of real-world usage conditions, making them the foundation for artificial simulation testing. Artificial simulation environmental testing is widely used in quality inspection. To ensure comparability and reproducibility of test results, standardized methods for basic environmental testing of products have been established.   Below are the environmental tests methods that can achieve by using environmental test chamber: (1) High and Low Temperature Testing: Used to assess or determine the adaptability of products to storage and/or use under high and low temperature conditions.   (2) Thermal Shock Testing: Determines the adaptability of products to single or multiple temperature changes and the structural integrity under such conditions.   (3) Damp Heat Testing: Primarily used to evaluate the adaptability of products to damp heat conditions (with or without condensation), particularly focusing on changes in electrical and mechanical performance. It can also assess the product's resistance to certain types of corrosion.   Constant Damp Heat Testing: Typically used for products where moisture absorption or adsorption is the primary mechanism, without significant respiration effects. This test evaluates whether the product can maintain its required electrical and mechanical performance under high temperature and humidity conditions, or whether sealing and insulating materials provide adequate protection.   Cyclic Damp Heat Testing: An accelerated environmental test to determine the product's adaptability to cyclic temperature and humidity changes, often resulting in surface condensation. This test leverages the product's "breathing" effect due to temperature and humidity changes to alter internal moisture levels. The product undergoes cycles of heating, high temperature, cooling, and low temperature in a cyclic damp heat chamber, repeated as per technical specifications.   Room Temperature Damp Heat Testing: Conducted under standard temperature and high relative humidity conditions.   (4) Corrosion Testing: Evaluates the product's resistance to saltwater or industrial atmospheric corrosion, widely used in electrical, electronic, light industry, and metal material products. Corrosion testing includes atmospheric exposure corrosion testing and artificial accelerated corrosion testing. To shorten the testing period, artificial accelerated corrosion testing, such as neutral salt spray testing, is commonly used. Salt spray testing primarily assesses the corrosion resistance of protective decorative coatings in salt-laden environments and evaluates the quality of various coatings.   (5) Mold Testing: Products stored or used in high temperature and humidity environments for extended periods may develop mold on their surfaces. Mold hyphae can absorb moisture and secrete organic acids, degrading insulation properties, reducing strength, impairing optical properties of glass, accelerating metal corrosion, and deteriorating product appearance, often accompanied by unpleasant odors. Mold testing evaluates the extent of mold growth and its impact on product performance and usability.   (6) Sealing Testing: Determines the product's ability to prevent the ingress of dust, gases, and liquids. Sealing can be understood as the protective capability of the product's enclosure. International standards for electrical and electronic product enclosures include two categories: protection against solid particles (e.g., dust) and protection against liquids and gases. Dust testing checks the sealing performance and operational reliability of products in sandy or dusty environments. Gas and liquid sealing testing evaluates the product's ability to prevent leakage under conditions more severe than normal operating conditions.   (7) Vibration Testing: Assesses the product's adaptability to sinusoidal or random vibrations and evaluates structural integrity. The product is fixed on a vibration test table and subjected to vibrations along three mutually perpendicular axes.   (8) Aging Testing: Evaluates the resistance of polymer material products to environmental conditions. Depending on the environmental conditions, aging tests include atmospheric aging, thermal aging, and ozone aging tests.   Atmospheric Aging Testing: Involves exposing samples to outdoor atmospheric conditions for a specified period, observing performance changes, and evaluating weather resistance. Testing should be conducted in outdoor exposure sites that represent the most severe conditions of a particular climate or approximate actual application conditions.   Thermal Aging Testing: Involves placing samples in a thermal aging chamber for a specified period, then removing and testing their performance under defined environmental conditions, comparing results to pre-test performance.   (9) Transport Packaging Testing: Products entering the distribution chain often require transport packaging, especially precision machinery, instruments, household appliances, chemicals, agricultural products, pharmaceuticals, and food. Transport packaging testing evaluates the packaging's ability to withstand dynamic pressure, impact, vibration, friction, temperature, and humidity changes, as well as its protective capability for the contents.     These standardized testing methods ensure that products can withstand various environmental stresses, providing reliable performance and durability in real-world applications.

  hot Tags : Vibration Test Chamber Environmental Testing Chamber High and Low Temperature Chamber Thermal Shock Chamber Cyclic Damp Heat Chamber Combined Environmental Test Chamber

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• Six Major Framework Structures and Operational Principles of Constant Temperature and Humidity Test Chambers

  Mar 13, 2025

  Refrigeration System The refrigeration system is one of the critical components of a comprehensive test chamber. Generally, refrigeration methods include mechanical refrigeration and auxiliary liquid nitrogen refrigeration. Mechanical refrigeration employs a vapor compression cycle, primarily consisting of a compressor, condenser, throttle mechanism, and evaporator. If the required low temperature reaches -55°C, single-stage refrigeration is insufficient. Therefore, Labcompanion's constant temperature and humidity chambers typically use a cascade refrigeration system. The refrigeration system is divided into two parts: the high-temperature section and the low-temperature section, each of which is a relatively independent refrigeration system. In the high-temperature section, the refrigerant evaporates and absorbs heat from the low-temperature section's refrigerant, causing it to vaporize. In the low-temperature section, the refrigerant evaporates and absorbs heat from the air inside the chamber to achieve cooling. The high-temperature and low-temperature sections are connected by an evaporative condenser, which serves as the condenser for the high-temperature section and the evaporator for the low-temperature section.   Heating System The heating system of the test chamber is relatively simple compared to the refrigeration system. It mainly consists of high-power resistance wires. Due to the high heating rate required by the test chamber, the heating system is designed with significant power, and heaters are also installed on the chamber's base plate.   Control System The control system is the core of the comprehensive test chamber, determining critical indicators such as heating rate and precision. Most modern test chambers use PID controllers, while a few employ a combination of PID and fuzzy control. Since the control system is primarily based on software, it generally operates without issues during use.   Humidity System The humidity system is divided into two subsystems: humidification and dehumidification. Humidification is typically achieved through steam injection, where low-pressure steam is directly introduced into the test space. This method offers strong humidification capacity, rapid response, and precise control, especially during cooling processes where forced humidification is necessary.   Dehumidification can be achieved through two methods: mechanical refrigeration and desiccant dehumidification. Mechanical refrigeration dehumidification works by cooling the air below its dew point, causing excess moisture to condense and thus reducing humidity. Desiccant dehumidification involves pumping air out of the chamber, injecting dry air, and recycling the moist air through a desiccant for drying before reintroducing it into the chamber. Most comprehensive test chambers use the former method, while the latter is reserved for specialized applications requiring dew points below 0°C, albeit at a higher cost.   Sensors Sensors primarily include temperature and humidity sensors. Platinum resistance thermometers and thermocouples are commonly used for temperature measurement. Humidity measurement methods include the dry-wet bulb thermometer and solid-state electronic sensors. Due to the lower accuracy of the dry-wet bulb method, solid-state sensors are increasingly replacing it in modern constant temperature and humidity chambers.   Air Circulation System The air circulation system typically consists of a centrifugal fan and a motor that drives it. This system ensures the continuous circulation of air within the test chamber, maintaining uniform temperature and humidity distribution.

  hot Tags : Constant Temperature and Humidity Chamber Test Chamber High-Precision Chamber Temperature Sensor Major Structures for Chamber Major Operation for Chamber

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• Analysis of Accessory Configuration in Refrigeration Systems for Environmental Test Equipment

  Mar 11, 2025

  Some companies equip their refrigeration systems with a wide array of components, ensuring that every part mentioned in textbooks is included. However, is it truly necessary to install all these components? Does installing all of them always bring benefits? Let's analyze this matter and share some insights with fellow enthusiasts. Whether these insights are correct or not is open to interpretation.   Oil Separator   An oil separator allows most of the compressor lubricating oil carried out from the compressor discharge port to return. A small portion of the oil must circulate through the system before it can return with the refrigerant to the compressor suction port. If the system's oil return is not smooth, oil can gradually accumulate in the system, leading to reduced heat exchange efficiency and compressor oil starvation. Conversely, for refrigerants like R404a, which have limited solubility in oil, an oil separator can increase the saturation of oil in the refrigerant. For large systems, where the piping is generally wider and oil return is more efficient, and the oil volume is larger, an oil separator is quite suitable. However, for small systems, the key to oil return lies in the smoothness of the oil path, making the oil separator less effective.   Liquid Accumulator   A liquid accumulator prevents uncondensed refrigerant from entering or minimally entering the circulation system, thereby improving heat exchange efficiency. However, it also leads to increased refrigerant charge and lower condensation pressure. For small systems with limited circulation flow, the goal of liquid accumulation can often be achieved through improved piping processes.   Evaporator Pressure Regulating Valve   An evaporator pressure regulating valve is typically used in dehumidification systems to control the evaporation temperature and prevent frost formation on the evaporator. However, in single-stage circulation systems, using an evaporator pressure regulating valve requires the installation of a refrigeration return solenoid valve, complicating the piping structure and hindering system fluidity. Currently, most test chambers do not include an evaporator pressure regulating valve.     Heat Exchanger   A heat exchanger offers three benefits: it can subcool the condensed refrigerant, reducing premature vaporization in the piping; it can fully vaporize the return refrigerant, reducing the risk of liquid slugging; and it can enhance system efficiency. However, the inclusion of a heat exchanger complicates the system's piping. If the piping is not arranged with careful craftsmanship, it can increase pipe losses, making it less suitable for companies producing in small batches.   Check Valve   In systems used for multiple circulation branches, a check valve is installed at the return port of inactive branches to prevent refrigerant from flowing back and accumulating in the inactive space. If the accumulation is in gaseous form, it does not affect system operation; the main concern is preventing liquid accumulation. Therefore, not all branches require a check valve.   Suction Accumulator   For refrigeration systems in environmental testing equipment with variable operating conditions, a suction accumulator is an effective means to avoid liquid slugging and can also help regulate refrigeration capacity. However, a suction accumulator also interrupts the system's oil return, necessitating the installation of an oil separator. For units with Tecumseh fully enclosed compressors, the suction port has an adequate buffer space that provides some vaporization, allowing the omission of a suction accumulator. For units with limited installation space, a hot bypass can be set up to vaporize excess return liquid.   Cooling Capacity PID Control   Cooling capacity PID control is notably effective in operational energy savings. Moreover, in thermal balance mode, where temperature field indicators are relatively poor around room temperature (approximately 20°C), systems with cooling capacity PID control can achieve ideal indicators. It also performs well in constant temperature and humidity control, making it a leading technology in refrigeration systems for environmental testing products. Cooling capacity PID control comes in two types: time proportion and opening proportion. Time proportion controls the on-off ratio of the refrigeration solenoid valve within a time cycle, while opening proportion controls the conduction amount of the electronic expansion valve. However, in time proportion control, the lifespan of the solenoid valve is a bottleneck. Currently, the best solenoid valves on the market have an estimated lifespan of only 3-5 years, so it's necessary to calculate whether the maintenance costs are lower than the energy savings. In opening proportion control, electronic expansion valves are currently expensive and not easily available on the market. Being a dynamic balance, they also face lifespan issues.

  hot Tags : Environmental Test Chamber accessory configuration in test chamber system components of the temperature chamber constant temperature/humidity control system optimization for test chamber application of components in test chamber

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• Constant Temperature and Humidity Test Chamber, High and Low Temperature Alternating Humidity Test Chamber: Differences Between Humidification and Dehumidification

  Mar 10, 2025

  To achieve the desired test conditions in a constant temperature and humidity test chamber, it is inevitable to perform humidification and dehumidification operations. This article analyzes the various methods commonly used in Labcompanion constant temperature and humidity test chambers, highlighting their respective advantages, disadvantages, and recommended conditions for use. Humidity can be expressed in many ways. For test equipment, relative humidity is the most commonly used concept. Relative humidity is defined as the ratio of the partial pressure of water vapor in the air to the saturation vapor pressure of water at the same temperature, expressed as a percentage. From the properties of water vapor saturation pressure, it is known that the saturation pressure of water vapor is solely a function of temperature and is independent of the air pressure in which the water vapor exists. Through extensive experimentation and data organization, the relationship between water vapor saturation pressure and temperature has been established. Among these, the Goff-Gratch equation is widely adopted in engineering and metrology and is currently used by meteorological departments to compile humidity reference tables. Humidification Process   Humidification essentially involves increasing the partial pressure of water vapor. The earliest method of humidification was to spray water onto the chamber walls, controlling the water temperature to regulate the surface saturation pressure. The water on the chamber walls forms a large surface area, through which water vapor diffuses into the chamber, increasing the relative humidity inside. This method emerged in the 1950s.   At that time, humidity control was primarily achieved using mercury contact conductivity meters for simple on-off regulation. However, this method was poorly suited for controlling the temperature of large, lag-prone water tanks, resulting in long transition processes that could not meet the demands of alternating humidity tests requiring rapid humidification. More importantly, spraying water onto the chamber walls inevitably led to water droplets falling on the test samples, causing varying degrees of contamination. Additionally, this method posed certain requirements for drainage within the chamber.   This method was soon replaced by steam humidification and shallow water pan humidification. However, it still has some advantages. Although the control transition process is lengthy, the humidity fluctuations are minimal once the system stabilizes, making it suitable for constant humidity tests. Furthermore, during the humidification process, the water vapor does not overheat, thus avoiding the addition of extra heat to the system. Additionally, when the spray water temperature is controlled to be lower than the required test temperature, the spray water can act as a dehumidifier.   Development of Humidification Methods   With the evolution of humidity testing from constant humidity to alternating humidity, there arose a need for faster humidification response capabilities. Spray humidification could no longer meet these demands, leading to the widespread adoption and development of steam humidification and shallow water pan humidification methods.   Steam Humidification   Steam humidification involves injecting steam directly into the test chamber. This method offers rapid response times and precise control over humidity levels, making it ideal for alternating humidity tests. However, it requires a reliable steam source and can introduce additional heat into the system, which may need to be compensated for in temperature-sensitive tests.   Shallow Water Pan Humidification   Shallow water pan humidification uses a heated water pan to evaporate water into the chamber. This method provides a stable and consistent humidity level and is relatively simple to implement. However, it may have slower response times compared to steam humidification and requires regular maintenance to prevent scaling and contamination.   Dehumidification Process   Dehumidification is the process of reducing the partial pressure of water vapor in the chamber. This can be achieved through cooling, adsorption, or condensation methods. Cooling dehumidification involves lowering the temperature of the chamber to condense water vapor, which is then removed. Adsorption dehumidification uses desiccants to absorb moisture from the air, while condensation dehumidification relies on cooling coils to condense and remove water vapor.   Conclusion   In summary, the choice of humidification and dehumidification methods in constant temperature and humidity test chambers depends on the specific requirements of the tests being conducted. While older methods like spray humidification have their advantages, modern techniques such as steam humidification and shallow water pan humidification offer greater control and faster response times, making them more suitable for advanced testing needs. Understanding the principles and trade-offs of each method is crucial for optimizing test chamber performance and ensuring accurate and reliable results.

  hot Tags : Constant Temperature and Humidity Test Chamber Humidity Control test chamber Alternating Humidity Test Chamber Suitable Conditions for different chambers Dehumidification Methods for chambers

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