Blog

• 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

  Read More
• 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

  Read More
• 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

  Read More
• 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

  Read More
• 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

  Read More
• 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

  Read More
• 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

  Read More
• Pharmaceutical Stability Testing Guidelines

  Mar 08, 2025

  Introduction:To ensure the quality of pharmaceutical products, stability testing must be conducted to estimate their shelf life and storage conditions. Stability testing primarily investigates the impact of environmental factors such as temperature, humidity, and light on the quality of pharmaceuticals over time. By studying the degradation curve of the product, the effective shelf life can be determined, ensuring the efficacy and safety of the drug during its use.     Storage Conditions for Pharmaceuticals General Storage Conditions Test Type Storage Conditions(Note 2) Long-term Testing 25°C ± 2°C / 60% ± 5% RH or 30°C ± 2°C / 65% ± 5% RH Accelerated Testing 40°C ± 2°C / 75% ± 5% RH Intermediate Testing (Note 1) 30°C ± 2°C / 65% ± 5% RH   Note 1: If the long-term testing condition is already set at 30°C ± 2°C / 65% ± 5% RH, intermediate testing is not required. However, if the long-term condition is 25°C ± 2°C / 60% ± 5% RH and significant changes are observed during accelerated testing, intermediate testing should be added. The evaluation should be based on the criteria for "significant changes." Note 2: For impermeable containers such as glass ampoules, humidity conditions may be exempt unless otherwise specified. However, all test items specified in the stability testing protocol must still be performed for intermediate testing. Accelerated testing data must cover at least six months, while intermediate and long-term stability testing must cover a minimum of twelve months.         Storage in Refrigerators Test Type Storage Conditions Long-term Testing 5°C ± 3°C Accelerated Testing 25°C ± 2°C / 60% ± 5% RH Storage in Freezers Test Type Storage Conditions Long-term Testing -20°C ± 5°C Accelerated Testing 5°C ± 3°C     Stability Testing for Formulations in Semi-Permeable Containers For formulations containing water or solvents that may experience solvent loss, stability testing should be conducted under low relative humidity (RH) conditions when stored in semi-permeable containers. Long-term or intermediate testing should be performed for 12 months, and accelerated testing for 6 months, to demonstrate that the product can withstand low RH environments. Test Type Storage Conditions Long-term Testing 25°C ± 2°C / 40% ± 5% RH or 30°C ± 2°C / 35% ± 5% RH Accelerated Testing 40°C ± 2°C / ≤25% RH Intermediate Testing (Note 1) 30°C ± 2°C / 35% ± 5% RH   Note 1: If the long-term testing condition is set at 30°C ± 2°C / 35% ± 5% RH, intermediate testing is not required. Calculation of Water Loss Rate at 40°C The following table provides the water loss rate ratio at 40°C under different relative humidity conditions: Substitute RH (A) Reference RH (R) Water Loss Rate Ratio ([1-R]/[1-A]) 60% RH 25% RH 1.9 60% RH 40% RH 1.5 65% RH 35% RH 1.9 75% RH 25% RH 3.0 Explanation: For aqueous pharmaceuticals stored in semi-permeable containers, the water loss rate at 25% RH is three times that at 75% RH.     This document provides a comprehensive framework for conducting stability testing under various storage conditions to ensure the quality, efficacy, and safety of pharmaceutical products throughout their shelf life.   These experiments can be achieved through our high and low temperature humid heat test chamber, more customized requirements please contact us.

  hot Tags : Pharmaceutical Stability Testing Chamber medicine storage test chamber Stability Evaluation Test Chamber Pharmaceutical Quality Test Chamber Drug Temperature Test Chamber

  Read More
• Introduction to Solar Simulation Irradiation Test Chamber

  Mar 07, 2025

  The Solar Simulation Irradiation Test Chamber, also known as the "sunlight radiation protection test device," is categorized into three types based on test standards and methods: air-cooled xenon lamp (LP/SN-500), water-cooled xenon lamp (LP/SN-500), and benchtop xenon lamp (TXE). The differences among them lie in test temperature, humidity, accuracy, duration, etc. It is an indispensable testing instrument in the series of aging test chambers.   The test chamber utilizes an artificial light source combined with G7 OUTDOOR filters to adjust the system's light source, simulating the radiation found in natural sunlight, thereby meeting the requirements for solar simulators as stipulated in IEC 61646. This system light source is employed to conduct light aging tests on solar cell modules in accordance with IEC 61646 standards. During the testing, the temperature on the back of the modules must be maintained at a constant level between 50±10°C. The chamber is equipped with automatic temperature monitoring capabilities and a radiometer to control the light irradiance, ensuring it remains stable at the specified intensity, while also controlling the duration of the test.   Within the solar simulation irradiation test chamber, the period of ultraviolet (UV) light cycling typically shows that photochemical reactions are not sensitive to temperature. However, the rate of any subsequent reactions is highly dependent on the temperature level. These reaction rates increase as the temperature rises. Therefore, it is crucial to control the temperature during UV exposure. Additionally, it is essential to ensure that the temperature used in accelerated aging tests matches the highest temperature that materials would experience when directly exposed to sunlight. In the solar simulation irradiation test chamber, the UV exposure temperature can be set at any point between 50°C and 80°C, depending on the irradiance and ambient temperature. The UV exposure temperature is regulated by a sensitive temperature controller and a blower system, which ensures excellent temperature uniformity within the test chamber.   This sophisticated control over temperature and irradiance not only enhances the accuracy and reliability of the aging tests but also ensures that the results are consistent with real-world conditions, through this Solar Simulation Irradiation Test Chamber, which can provide valuable data for the development and improvement of solar cell technologies.

  hot Tags : Xenon Lamp Weathering Test Chamber UV Aging Test Chamber Accelerated Weathering Test Chamber Solar Simulation Irradiation Test Chamber Solar Simulation Test Chamber

  Read More
• Overview and Features of UV Aging Test Chamber

  Mar 06, 2025

  This product is designed for the fluorescent ultraviolet (UV) lamp method in laboratory light source exposure testing of various materials. It is primarily used to evaluate the changes in materials when exposed to outdoor conditions, as well as for durability testing of new material formulations and products.   This UV Aging Test Chamber utilizes fluorescent UV lamps that optimally simulate the UV spectrum of sunlight. Combined with temperature and humidity control devices, it replicates the effects of sunlight (UV spectrum), high temperature, high humidity, condensation, and dark cycles, which cause material damage such as discoloration, loss of brightness, reduced strength, cracking, peeling, chalking, and oxidation. Additionally, the synergistic effect of UV light and moisture weakens or nullifies the material's resistance to light or moisture, making it widely applicable for assessing the weather resistance of materials. This test chamber offers the best simulation of sunlight's UV spectrum, low maintenance and operational costs, ease of use, and high automation with programmable controllers for automatic test cycle operation. It also features excellent lamp stability and high reproducibility of test results.   The humidity system consists of a water tank and a humidification system. Through the mechanism of moisture condensation, the exposed surface of the sample is wetted, simulating rain, high humidity, and condensation, which, in conjunction with UV light and dark cycles, creates an optimal testing environment. The chamber is equipped with safety protection systems, including water shortage prevention, dry burn protection, over-temperature protection, short-circuit protection, and overload protection, located on the electrical control panel and inside the electrical control cabinet. Upon entering an alarm state, the equipment automatically cuts off the power to the working system, halts operation, and emits an audible alert to ensure the safety of both the equipment and the operator.

  hot Tags : UV Aging Test Chamber Fluorescent Ultraviolet Lamp UV Spectrum Simulation Accelerated Weathering Test Chamber

  Read More
• Ultraviolet Light Accelerated Aging Test chamber: Humid Condensation Environment and Water Spray System

  Mar 05, 2025

  In many outdoor environments, materials can be exposed to humidity for up to 12 hours a day. Research shows that the main factor causing this outdoor humidity is dew, rather than rainwater. The Accelerated Aging Test chamber simulates the outdoor humid erosion through its unique condensation function. During the condensation cycle of the test, the water in the reservoir at the bottom   of the test chamber is heated to generate hot steam, which fills the entire test chamber. The hot steam maintains the relative humidity in the test chamber at 100% and keeps a relatively high temperature. The sample is fixed on the side wall of the test chamber, so that the test surface of the sample is exposed to the ambient air inside the test chamber. The outer side of the sample is exposed to the natural environment, which has a cooling effect, resulting in a temperature difference between the inner and outer surfaces of the sample. This temperature difference leads to the continuous generation of condensed liquid water on the test surface of the sample throughout the condensation cycle.   Since the exposure time to humidity during outdoor exposure can be as long as more than ten hours a day, a typical condensation cycle generally lasts for several hours. The Accelerated Aging Tester provides two methods for simulating humidity. The most widely used method is the condensation method, which is the best way to simulate outdoor humid erosion. All Accelerated Aging Tester models can run the condensation cycle. Because some application conditions also require the use of water spray to achieve the actual effect, some models can run both the condensation cycle and the water spray cycle. For certain applications, water spray can better simulate the final usage environmental conditions. Water spray is very effective in simulating the thermal shock or mechanical erosion caused by sudden temperature changes and the scouring of rainwater. Under certain actual application conditions, for example, in the sunlight, when the accumulated heat dissipates rapidly due to a sudden shower, the temperature of the material will change sharply, resulting in thermal shock, which is a test for many materials. The water spray of the chamber can simulate thermal shock and/or stress corrosion. The spray system has 12 nozzles, with 6 nozzles on each side of the test chamber. The spray system can run for a few minutes and then be turned off. This short period of water spraying can quickly cool the sample, creating the conditions for thermal shock. 

  hot Tags : Uv test chamber Ultraviolet Light Accelerated Aging Test chamber moist test chamber natural Env. test chamber

  Read More
• ALL ABOUT TEMPERATURE CHAMBERS: WHAT ARE THEY & HOW DO THEY WORK?

  Mar 03, 2025

  Lab-companion, whom we committed to delivering high-quality environmental testing equipment that serves the diverse needs of various industries. As industry leaders, we offer a range of products that ensure reliable testing and quality assurance for your operations.   Our thermal chambers can operate within a temperature range of 0°C to + 200°C and a humidity range of 5% to 98% RH. These chambers provide stable, long-term test conditions, making them compliant with the ICH Q1A guideline and ideal for a multitude of applications.   Learn more about thermal chambers below and how they can help ensure longevity and reliability for all your testing needs.   WHAT ARE TEMPERATURE CHAMBERS? Temperature Chambers, often interchangeably referred to as Thermal Chambers, are specialized enclosures designed to create controlled thermal environments. These chambers enable precise temperature simulations ranging from extreme cold to elevated heat to provide a stable setting where researchers can test products or materials for their resilience, durability, and overall performance. The role of temperature chambers is pivotal in research and development phases across industries. Temperature chambers subject a product to various thermal conditions it is likely to encounter in the real world. This simulative testing is essential to quality assurance processes, ensuring that products meet the safety and performance standards required. By replicating various temperature scenarios, temperature chambers allow manufacturers and researchers to identify potential design flaws early, thus saving both time and resources in the long run.   HOW DO THERMAL CHAMBERS WORK? A thermal chamber is a complex assembly of various components that create a controlled thermal environment. At its core are heating and cooling systems that can generate the required temperatures. These systems often use electric heaters for heating and a combination of compressors and refrigerants for cooling. Insulation is critical to maintaining the chamber’s internal environment. Specialized materials help ensure that temperature changes are well-contained. Airflow management is also key; fans and ducts circulate the air to create uniform conditions throughout the chamber. The “brains” of a thermal chamber are its controls and sensors. These are responsible for monitoring the temperature and ensuring it remains within set parameters. Many thermal chambers utilize PID (Proportional-Integral-Derivative) controllers to maintain temperature accuracy. PID controllers continuously calculate the difference between the desired and current temperatures, making real-time adjustments to the heating and cooling systems to keep the temperature within a predefined range. All these components come together to power a system that can simulate a wide range of temperature conditions, making thermal chambers invaluable tools in product development and quality assurance processes.   TEMPERATURE CHAMBERS: INDUSTRIES AND APPLICATIONS Temperature or thermal chambers are versatile tools that find applications across numerous industries. Their role in simulating various temperature conditions makes them indispensable for research, development, and quality assurance. AUTOMOTIVE INDUSTRY In the automotive sector, thermal chambers test components like engines, batteries, and HVAC systems. These tests help manufacturers ensure that vehicles can withstand extreme weather conditions, be it the cold of a frigid winter or the heat of a scorching desert. ELECTRONICS INDUSTRY For electronics, thermal chambers help ensure that devices like smartphones, laptops, and other gadgets operate effectively across various temperatures. For example, humidity condition tests are crucial for consumer satisfaction and safety, ensuring that devices won’t fail when exposed to extreme conditions. MEDICAL/PHARMACEUTICAL INDUSTRY In the medical and pharmaceutical sectors, thermal chambers are essential for testing the stability and shelf-life of drugs and the reliability of medical devices. From vaccines to pacemakers, stability testing ensures these critical products operate safely and efficiently. AEROSPACE INDUSTRY The aerospace sector often utilizes thermal chambers to test components that will endure extreme conditions in space or high-altitude flight. Aerospace manufacturers must test everything from materials used in aircraft bodies to the electronics in satellite systems to ensure resilience, reliability, and safety.   TYPES OF TESTS CONDUCTED IN THERMAL CHAMBERS Thermal chambers are highly versatile and capable of performing an array of tests that simulate different environmental conditions. Some of the most common tests include: Thermal Cycling: This test exposes the subject to various temperatures, oscillating between cold and hot conditions, to assess its resilience and pinpoint any potential weaknesses. Thermal Shock: Here, the product is subjected to abrupt temperature changes to evaluate its ability to withstand sudden temperature fluctuations, a frequent cause of failure for numerous devices. High-Temperature Testing: This test assesses the subject’s ability to function in extremely high temperatures, often for extended periods. Low-Temperature Testing: This test evaluates how well a product can function at cold temperatures, often freezing or below. Temperature Humidity Testing: This test combines both temperature and humidity variables. While thermal chambers mainly focus on temperature conditions, they can often incorporate humidity settings to some extent. This is where they differ from humidity chambers, which primarily control moisture levels. If you’re looking for a chamber that controls temperature and humidity, Lab-companion offers specialized chambers that provide the best of both worlds.   EXPLORE LAB-COMPANION’S TEMPERATURE CHAMBERS When it comes to reliability and efficiency, our product catalog stands out for several compelling reasons: Accelerated Testing: With advanced heating and cooling systems, our chambers are designed for rapid temperature cycling, allowing for quicker test completion without compromising the accuracy of results. Reliable Results: The chambers are equipped with cutting-edge sensors and controls, ensuring that you receive consistent and reliable data throughout the testing process. Cost-Efficiency: Investing in a high-quality temperature chamber like those offered by us can significantly reduce long-term testing costs. Their durability and low maintenance requirements make them a cost-effective choice for any organization. Customizable Settings: Lab-companion offers a high degree of customization, allowing you to tailor the testing environment according to the specific needs of your product, further enhancing the accuracy of your tests.   Understanding the ins and outs of temperature chambers is essential for anyone involved in product development, research, or quality assurance across various industries. These chambers play a crucial role in simulating different environmental conditions, enabling organizations to rigorously test their products for safety, reliability, and durability. From automotive and electronics to aerospace and pharmaceuticals, the applications are as diverse as they are crucial. If you’re looking to elevate your testing processes, you can’t afford to overlook the value of a top-tier temperature chamber. Contact us at the bottom of the page for more information.    

  hot Tags : thermal chamber temperature chamber Environmental Testing Chamber Customizable chamber humidity chamber

  Read More