Refrigeration system is one of the important part of the constant temperature and humidity
testing-equipment' target='_blank'>test chamber, generally all mechanical equipment refrigeration freezing method and its auxiliary liquid nitrogen refrigeration, mechanical equipment cooling steam shrink used refrigeration, their key by the refrigeration compressor, condenser, throttle valve tissue and air conditioning evaporator.
To be done - if we test the temperature of the ultra-low temperature
55 ℃, single-stage refrigeration can't conform to the requirements, and constant temperature and humidity test chamber refrigeration methods generally choose cascade refrigeration.
Constant temperature and humidity box of the refrigeration system consists of two part, each part is called part of high temperature and cryogenic, each part is a relatively separate refrigeration system.
High temperature part of knowing the volatile digestion and absorption in the medium is derived from the part of cryogenic refrigerant of calorific value and the gasification;
Part of ultra-low temperature evaporation of refrigerant from the refrigeration target (
In the experiment box gas)
Endothermic reaction for refrigerating capacity.
High temperature part and cryogenic part is to use a volatile middle cooler contact, it is part of the high temperature cooler, is also part of the cryogenic cooler.
Constant temperature and humidity test chamber of relative refrigeration system, heating system is relatively simple.
It key composed of high-power resistance wire, as stipulated by the environmental test chamber temperature speed greatly, and environmental test chamber heating system output power is relatively large, and in the environmental test chamber of blank is also set up the electric heater.
Constant temperature and humidity test chamber of the automatic control system is the key of integrated environmental test chamber, it is a decision of environmental test chamber temperature, speed, precision and so on key parameter values.
Nowadays environmental test chamber panel selection of most of the PID control is also a small number of control method of PID controller design and phase composition.
Because most of the automatic control system belongs to the scope of the mobile phone software, and this part of the whole process in the application is generally not easy to appear problem.
Constant temperature and humidity test chamber of the sensor system is mainly temperature and temperature sensor.
Temperature sensor is used more platinum electric group and heat resistance.
Environmental humidity measurement method has two kinds: dry moisture meter method and solid electronic sensor measurement immediately.
Because of the wet area ball method measuring accuracy is not high, the constant temperature and humidity box now is gradually replace wet area ball with solid sensor to carry out the precise measurement of the ambient humidity.
Constant temperature and humidity test chamber exhaust air breathing system generally have the centrifugal fan of the cooling fan and drives the motor running.
It presented the experiment box in the circulation system of the gas.
Constant temperature and humidity test chamber temperature system is divided into humidification and dehumidification of two subsystem.
Generally choose steam humidification humidification method, will immediately bottom pressure steam into the laboratory space humidification.
This kind of humidification way humidification work ability, speed faster, humidification dexterous manipulation, especially when in minus temperature is very easy to complete mandatory humidification.
Dehumidification method has two kinds: mechanical equipment cooling dehumidification and dry manic dehumidification.
Mechanical equipment of cooling dehumidification is basic principle of desiccant evaporative cooling to the moisture content of the following, make more than saturated moisture content of water vapor coagulation dissolution, as environmental humidity is reduced.
Air dryer desiccant is to use the gas in the pump will experiment box draw out, and the dry gas is introduced into manic, moist air will be sent to other recyclable dry mania in dry rashness, after the dry mania and sent to the box, so for dehumidification cycle system.
Now the vast majority of integrated environmental test chamber is chosen before a dehumidification method method, a way of dehumidification, after can make the following moisture content do zero degrees Celsius.
Suitable for places with special requirements, but cost too expensive.
The interpretation of the above is the constant temperature and humidity test chamber of main system function principle, hope can help you, if you want to learn more about information of constant temperature and humidity test chamber, welcome to the online consulting service or call the company service hotline (
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For consultation, we will wholeheartedly provide high quality service for you!
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