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
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