Temperature and Humidity Chamber Is Kind Of Cold Hot Thermal Shock Chamber

Temperature and Humidity Chamber is used to test the material structure and composite material, can withstand the range in the continuous environment of extreme low temperature or extreme high temperature, and to test the chemical change of thermal expansion and contraction caused by it. A kind of testing mechanical instrument which can accurately test temperature and humidity. In addition, the high and low temperature humidity thermal shock test box is also called Cold and Hot Thermal Shock Chamber.

Precautions for production and use of infrared forehead thermometers

I. What is the function of Temperature and Humidity Chambers?
1. Cooling function: The compressor is the heart and blood of the refrigeration system. The test instrument inhales low-temperature and low-pressure gas to become high-temperature and high-pressure gas, and form liquid through condensation, and release heat. After the instrument’s fan takes away heat, the instrument is a hot air factor. Then, it passes through the throttling to become low-pressure liquid, and then it passes through the evaporator to become low-temperature and low-pressure gas back to the compressor.

2. Humidifying and dehumidifying function: The refrigeration system is the factor to complete the dehumidification system. The evaporator is placed in the Cold and Hot Thermal Shock Chamber, because it is relatively cold, the high humidity gas in the equipment will condense into liquid when it meets cold objects, and after so many cycles, the high humidity gas in the equipment will be reduced, so as to achieve the purpose of dehumidification.

3. Heating function: Heating settings is one of the key factors in determining whether the Temperature and Humidity Chamber has heating or not. When the controller receives the heating indication, it will output voltage to the relay, about 3-12 volts direct current is added on the solid state relay, the AC end is equivalent to wire connection, and the contactor will also be attracted at the same time, the heater has two sides of voltage to make it heat, and the heat is brought to the box through the circulating fan, so the instrument will heat up, and the temperature will quickly reach the preset value set by the customer.

II. How to control temperature and humidity in Temperature and Humidity Chamber?
Temperature and Humidity Chamber is placed in the specified temperature and humidity according to the product’s ability to resist high temperature, low temperature and humidity, so the high and low temperature humidity hot and cold test box has heating, cooling, humidification and dehumidification abilities. The heating device of the high and low temperature humidity hot and cold test box is the key to determine whether the high and low temperature humidity hot and cold test box is heated or not. When the controller receives the heating instruction, it will output voltage to the relay, about 3-12 volts direct current is added on the solid state relay, the AC end is equivalent to wire connection, and the contactor will also be attracted at the same time; the heater has two sides of voltage to make it heat, and the heat is brought to the box through the circulating fan, so the instrument will heat up, and the temperature will quickly reach the preset value set by the customer; the controller regulates the heating output by connecting and disconnecting the solid state relay; we can adjust the heating output by observing the screen in the high and low temperature humidity hot and cold test box; this is the temperature control above 89 degrees, and How to control the temperature stability below 89 degrees? The Temperature and Humidity Chamber is heating the output on one side through the solid state relay; on the other hand, cooling is achieved by the compression refrigeration cycle; the temperature is constant. Cooling is an important link in the high and low temperature humidity hot and cold test box and an important parameter to judge the performance of a high and low temperature humidity hot and cold test box. It includes four components: compressor, condenser, throttling device and evaporator.

The refrigerator is the heart of the refrigeration system, which sucks in low temperature and low pressure gas and becomes high temperature and high pressure gas. Through condensation of heat into liquid, it is discharged by the fan, so the reason of hot air under the high and low temperature humid heat test box is the hot air, then through throttling to low pressure liquid, and then through the evaporator into low temperature and low pressure gas at last return to the compressor; refrigerant absorbs heat in the evaporator to complete vaporization, so as to achieve the purpose of cooling and complete the process of cooling down the Temperature and Humidity Chamber 

The moisturizing system of the high and low temperature humidity test box is almost the same as the heating system. It is the process of heating water into steam by the heater to achieve the purpose of moisturizing the high and low temperature humid heat test box. The dehumidification system of the high and low temperature humid heat test box is also completed by the refrigeration system. The evaporator is placed in the Cold and Hot Thermal Shock Chamber. The relatively cold air will condense into liquid when it meets the cold objects. In this way, the high humidity air in the box will be very little, so as to achieve the purpose of dehumidification.

The Cold and Hot Thermal Shock Chamber is suitable for testing the humid and temperature resistance of electrical and electronic products, components, parts and materials under different temperature and humidity conditions, and also for testing the various performance parameters of the tested products.
1. Over temperature alarm The equipment is equipped with a separate over temperature protection temperature controller. The over temperature alarm is generally the following problems:
(1) due to the operation failure caused by the low setting of the over temperature protection temperature controller, it is only necessary to adjust the over temperature protection temperature controller;
(2) the temperature value displayed on the instrument has exceeded the original set temperature value. This may be caused by the breakdown of the temperature control element, the instrument fault or the control circuit fault.

2. Overpressure alarm
(1) The pressure value set by the internal pressure controller of the equipment is incorrect. If it is lower than 1.8 Mpa, it should be adjusted.
(2) If there are ashes on the condenser, the heat exchange effect is not good, and then the condenser of the Cold and Hot Thermal Shock Chamber can be cleaned.
(3) The failure of other refrigeration systems in the equipment will also lead to the problem of overpressure alarm.

3. Water shortage alarm
The water shortage alarm of the equipment usually comes from the water shortage of the moisturizing water tank:
(1) when the moisturizing water tank is filled with water for the first time, the water level has not reached.
(2) If there are blockages in the water supply pipe, it can be dredged.
(3) The normal temperature of the water shortage protection temperature controller should be 110°C.

Lisun Instruments Limited was found by LISUN GROUP in 2003. LISUN quality system has been strictly certified by ISO9001:2015. As a CIE Membership, LISUN products are designed based on CIE, IEC and other international or national standards. All products passed CE certificate and authenticated by the third party lab.

Our main products are Goniophotometer, Integrating Sphere, Spectroradiometer, Surge Generator, ESD Simulator Guns, EMI Receiver, EMC Test Equipment, Electrical Safety Tester, Environmental Chamber, Temperature Chamber, Climate Chamber, Thermal Chamber, Salt Spray Test, Dust Test Chamber, Waterproof Test, RoHS Test (EDXRF), Glow Wire Test and Needle Flame Test.

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