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The temperature control process of constant temperature and humidity test chamber
Constant temperature and humidity test chamber is mainly used to test the characteristics of raw materials under different conditions on the machinery and equipment, its testing is not the same as raw material of low temperature resistant, high temperature resistance, resistance to dry and its characteristics of the water. The temperature control process of the constant temperature and humidity test chamber is how? To allow the jester to explain for everybody below: a: the process of temperature rise, constant temperature and humidity test of warming in the oven is mainly choose high-power resistance wire, as stipulated by the environmental test chamber is very big, temperature and constant temperature and humidity and temperature of the test chamber system software is divided into two humidification and dehumidification system. Cooling process: cooling cooling, constant temperature and humidity test chamber of 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, ultra-low temperature stainless steel sink because everybody should do the experiment of cryogenic temperature 55 ℃, unipolar cooling cannot consider meets the requirements, and constant temperature and humidity test chamber refrigeration methods generally choose cascade refrigeration. Three, humidification process: constant temperature and humidity test chamber and wet vapor pressure in fact is the process of ascension, the beginning of humidifying method is to constant temperature and humidity test chamber wall since the water spray, according to the control surface saturation pressure for the water temperature control. Box wall produce very big surface, the surface of the water on the surface to the box based on diffusion method to add water vapor pressure box outside air humidity rise in environmental test chamber, it appeared in the 1950 s. Because at that time the environmental humidity control is mainly with contacts with liquid silver electricity conductivity table to carry out simple switch quantity adjustment, in view of the of the big water tank temperature control weak adaptive capacity, and manipulation of cohesive process longer, do not consider variations and dampness of humidification quantity regulation more must more key is in the box wall under the condition of flowing, inevitably there are water spray on the sample of the sample produce different levels of environmental pollution. Four, the dehumidification process: constant temperature and humidity test chamber of dehumidification method has two kinds: mechanical equipment cooling dehumidification and dry manic dehumidification. 1, mechanical equipment cooling dehumidification of 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. 2 using the pump, air dryer desiccant is to pull the gas in the experiment box, 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 constant temperature and humidity test chamber choose before a dehumidification method method, a way of dehumidification, after can 0 ℃ temperature, of the following applicable places with special requirements, but cost too expensive. The interpretation of the above is the temperature control process of constant temperature and humidity test chamber, 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 ( Website top right corner) For consultation, we will wholeheartedly provide high quality service for you! Tags: & nbsp constant temperature and humidity test chamber
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1. ISO 5402-1: Specifies the flexometer method for testing leather flex resistance under repeated bending.
2. ISO 17694: Defines test methods for footwear upper and lining flex resistance, simulating real-world bending stress to assess long-term durability.
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