Thermal shock impact testing chamber working principle

Thermal shock impact testing chamber is a simulation of high temperature and low temperature impact of environmental testing equipment, the test equipment used to test the material structure or composite materials, in an instant conversion can withstand very high temperature or very low temperature test,that can be detected in a short time,if test sample will thermal expansion and contraction lead to   chemical or physical damage. But with a good test equipment, you do not know how it works, that a pity. Here, we take a look at what is the working principle of thermal shock impact testing chamber?

Three boxes thermal shock impact testing chamber working principle:Test products are placed in test box,it adopt upper,middle and lower box structure,the upper box is high temperature box,the middle box is test box,the lower box is low temperature box.The upper high temperature box and lower low temperature box are able to set the test temperature and extreme temperature condition .When use low temperature chamber test,the low temperature door be opened with test chamber to test working space,and process low temperature test.Switch to the high temperature test,the door of low temperature box door is closed ,the high temperature box and test box to be a new test working space,the mechanical action of switch can be completed in less than 1s,and the temperature can be fast stable.During the whole test processing,the sample is not moved at all and no need operator intervention.

Two boxes thermal shock impact test chamber working principle:the test products are placed in the basket,the motor driver basket movement to complete the high and low temperature switching temperature transformation,the test samples are moving with the basket.Two box type equivalent put sample into the high temperature zone and low temperature zone.So,with the real three box thermal shock impact test chamber is not same and get the “thermal impact” result will not be same.

RT-310A Thermal shock impact testing chamber(3 boxes)

RT-310B Thermal shock impact testing chamber(2 boxes)

What items can replace the constant temperature and humidity test chamber wet ball gauze?

Constant temperature and humidity test chamber suitable for electronic, electrical, communications, instrumentation, vehicles, plastic products, metal, food, chemical, building materials, medical, aerospace and other products for quality testing purposes. Wet ball gauze as constant temperature and humidity test chamber important sensing components, is essential, then, what items can replace the constant temperature and humidity test chamber wet ball gauze ?

Wet ball gauze (wet bulb) have certain requirements, you can use advanced wet tissue instead it, but not any gauze can be substituted, because the relative humidity reading is based on the difference between temperature and humidity, strictly speaking also related with the local Atmosphere Pressure, wind speed.

Wet bulb temperature indication value is related with inhalation of water and the surface evaporation . These are directly closely related with the quality of gauze, so the weather provides that the wet ball gauze must be flax woven into a special "wet ball gauze." Otherwise it is difficult to ensure constant temperature and humidity test chamber wet bulb thermometer showed the correctness of the value, that is, the correctness of humidity. In addition, the placement of wet ball gauze is also clearly defined, gauze length: 100mm, tightly wrapped sensor probe, the probe from the humidity cup 25-30mm, gauze immersed in the cup, so as to ensure the correctness of control equipment and humidity accuracy.

How to choose water-cooled xenon lamp or air-cooled xenon lamp test chamber?

Xenon lamp test chamber is widely used to test materials and products of light stability and anti-aging, because the xenon arc lamp is very close to the complete spectrum including ultraviolet (UV), visible light and infrared (IR) solar spectrum. In order to obtain accurate and reproducible test results, all photostability or aging performance tests must control the quality of the light. Changes in light intensity will affect the rate of material damage. Changes in the energy distribution of the surface spectrum will affect the degradation of the material speed and type.

In 1918,appeared the world's first rotating drum xenon lamp aging test chamber, which uses a carbon arc lamp as a light source, light source or lamp placed vertically in the instrument center, surrounded by a filter system. The test specimen was mounted facing the light source and rotated like a conveyer belt around the center lamp. Since the first World War, this chamber has also been improved, but the basic design principle has not changed. The most common test chamber lamp cooling system using water cooling, this type of test chamber is called "water-cooled xenon arc chamber."

In recent years, the emergence of a new type of static sample placement xenon lamp chamber, in the top of the test room installed one or more air-cooled xenon lamp. In this system, the filter is flat and placed in the lower part of the lamp tube with a reflector system on the top and side of the chamber to enhance the uniformity of the irradiance. The test sample is mounted on a sample tray underneath the lamp vessel. The tray is slightly tilted at a small angle to allow water flow, and this type of chamber is called "air-cooled xenon arc chamber".

Regardless of the type of chamber, there are control systems that control the intensity of light "irradiance", temperature and relative humidity, except for the way the lamp cools and the sample area. The water-cooled xenon arc test chamber sampler area is the fixture, The sample area of the air-cooled xenon arc test chamber is pallet-like and is suitable for any regular and irregular sample items.

Paint, paint, rubber, plastic, adhesives, fabrics and other industrial sample can be sliced to do the test, suitable for selection of water-cooled xenon arc test chamber. Automotive, cosmetics, universities, research and other units of the shape of the test items are not fixed, suitable for air-cooled xenon arc test chamber.