Electrical Safety of chamber

• 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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