White Stablity Temperature Humidity Test Chamber High and Low Tempearture Storage c
Application
The chamber used to test the performance of materials in various environments and to test the heat, cold,
dry and moisture resistance of various materials. For electronic, electrical appliances, mobile phones,
communications, meters, vehicles, plastic products, metals, food, chemicals, building materials, medical,
aerospace and other products used for testing quality. Meet the standards: GB/T5170.5-2008,
GB/T10586-2006, GB/T2423.1-2008 Test A, GB/T2423.2-2008 Test B, GB/T2423.3-2006 Test Ca,
GB/T2423 .4-2008 Test Db
Main technical specification
| Temp. range | -20℃ ～ +150℃ |
| Temp. deviation | ≤±2.0℃ |
| Temp. fluctuation | ±0.5℃ |
| Temp. uniformity | ≦2.0℃Overall average |
| Heating and cooling rate | +20℃↓ -40℃ 1°C/min (no-load) -40℃↑ +40℃ 3°C/min (no-load) |
| Chamber size | Interior size :W 700 × IH 750 × ID 800 mm Exterior size :W 980 × EH 1936 × ED 1735 mm |
| Humidity range | 20%R.H.～98%R.H |
| Door | Single door,Left open , heating wire is installed at the door frames to prevent condensation at low temperatures |
| Obverstion Window | With 1 set 460 × 560mm (width × height) observation window, |
| Lighting Device | 1 PC 11W/AS220V installed in the inspection window |
Other specification
| Chamber Structure |
| 1. Composed | Overall structure and chamber was composed of three parts as below Insulation box, separate refrigeration units, and electrical control cabinet. |
| 2. Door | Heating wire was installed at the door frames to prevent condensation at low temperatures. |
| 3. Cable port | Φ50mm*2 located on both sides (each*1) with rubber stopper and plastic cover |
| 4. Lighting device | 11W/AC220V *1 located on observation window |
| 5.Water outlet hole | Available for drain the condensate water |
| 6. Sample holder | Two layers of stainless steel sample holder. |
| 7.Mobile Casters | Mobile Casters *4 with foot cups |
Photos show
Control method
Balanced temperature and humidity control system (BTHC) controls SSR in a P.I.D. mode so that the
system's heating humidification amount is equal to the heat and moisture loss, so it can be used stably for
a long period of time.
Slow cooling and solutions
1. Analysis of Non-refrigeration of Constant Temperature and Humidity Chamber and Solution to
Temperature and Humidity Test Chamber Failure
First of all, look at whether the constant temperature and humidity test chamber is running at low
temperature for a long time. When the programmable constant temperature and humidity test chamber
finishes the low temperature operation, the evaporator freezes. It is better to perform drying at about 60°C
for about 30 minutes. Open the door, this time can solve the problem that the constant temperature and
humidity box does not cool.
2. Constant temperature and humidity box electrical appliances, circuits are operating normally. Since the
temperature of the constant temperature and humidity chamber cannot be maintained, it is observed
whether the refrigeration compressor can be started during the operation of the test chamber and the
compressor can be started during the operation of the environmental test equipment. Shanghai Hairui
Instrument Co., Ltd. explains that from the main power supply to each compression The electrical circuit of
the machine is normal, and there is no problem with the electrical system.
3. There is no problem with the electrical system and check the refrigeration system again. First of all, it is
checked that the exhaust and suction pressures of low-temperature (R23) compressors of the two sets of
refrigeration units are lower than normal and the suction pressure is in a pumped-out state, indicating that
the amount of refrigerant in the main refrigeration units is insufficient.
