The problem

Refrigerator thermostats pass only an action-temperature check at the factory, then drift, stick or fail on the appliance within months; a 210240-cycle loaded endurance run is impossible by hand, and the high/low temperature plus pneumatic cycling condition is beyond ordinary life testers.

Capability

10 stations tested simultaneously; load voltage AC220V to AC250V/50Hz plus/minus 0.5 percent via double-wound isolation transformer; basic current 2A/5A (COS0.5 plus/minus 0.1) and inrush 10A/20A (COS0.75 plus/minus 0.1), current accuracy 5 percent; pneumatic system 1-7kg (0.1-0.7MPa) settable, accuracy 0.5 percent of 1MPa full scale, resolution 0.01MPa, fill/vent rate under 0.01MPa/min, proportional valve programmable or manual; actuation rate 6 cycles/min, T0-T9 sequential pulses, on/off ratio 1S:9S; cycle count 0-999999 programmable with power-fail protection; climate chamber -40 to +150C, 95 percent RH, ramp 2-3C/min, fluctuation under plus/minus 0.5C, deviation under plus/minus 2.0C; test condition +60C/1.5h/95 percent RH and -30C/1.5h, 0.5h transition, 101.32kPa; acceptance: mid-range temperature characteristic shift under 3C after test; automatic detection of pressure shift, contact welding, open contacts and current drop with alarm; leakage and grounding protection; AC220V, max 3.5KW.

Key specifications

• 工位配置：10工位，可同时对10只冰箱温控器进行压力动作耐久试验
• 负载电压：AC220V变AC250V/50Hz±0.5%，双绕组隔离变压器隔离供电
• 负载电流：基本电流2A/5A（COSΦ=0.5±0.1）；冲击电流10A/20A（COSΦ=0.75±0.1）；电流精度5%
• 气压系统：试验压力1～7kg（0.1～0.7MPa）可调；压力精度0.5%×1MPa满量程；传感器分辨率0.01MPa
• 压力速率：充气/排气速率可调，求取动作压力时＜0.01MPa/min；比例调节阀支持参数编程设定或人工调节
• 动作速率：6次/min，T0～T9脉冲顺序导通；通断比1S:9S（单负载）；接通/断开温度检测速率6分钟/只
• 试验次数：0～999999次可编程；动作次数、状态等数据断电程序保护
• 环境模拟：高低温湿热试验箱设计范围-40～+150℃、湿度95%；升温速率2～3℃/min；波动度≤±0.5℃（空载）；温度偏差≤±2.0℃
• 试验工况：高温+60℃/1.5h/湿度95%+低温-30℃/1.5h、温度转换0.5h为一循环，试验气压101.32kPa
• 合格判定：试验后测中间档温度特性，前后之差＜3℃且各部位运行无异常；允许多次轻微粘接、不允许重粘接，不允许膜盒疲劳泄漏

Applications

Type testing and endurance sampling at refrigerator/freezer thermostat plants; loaded life verification of vapour-pressure thermostats; incoming and supplier batch audits; third-party thermostat endurance testing

About the manufacturer

Guangdong Endurance Electronic Equipment Co., Ltd provides non-standard customization, drawing confirmation, factory acceptance, on-site installation and commissioning, operation training and lifetime technical service; 12-month warranty and lifetime spare parts supply. Tel: 0760-88500902 / 13416787649. Web: en.zsnaili.com.