Structural characteristics and precautions for use of constant temperature and humidity experimental box

The constant temperature and humidity test box is suitable for the test and detection of temperature and humidity change products in textile and clothing, electronics and electrical, food, plastic and rubber, automobile manufacturing, lamps, chemicals, building materials, chemical reactions,
etc.
The constant temperature and humidity experiment box has a large temperature and humidity control range, and can provide: constant high temperature test, high temperature and high humidity test, constant low temperature test, constant humidity and heat experiment box, high and low temperature humidity and heat combined cycle and other tests
.

Structural features of the constant temperature and humidity test box:
1.
The constant temperature and humidity test box is processed and formed by CNC machine tools, with a beautiful and novel appearance, and adopts a non-reaction handle, which is easy to operate
.

2.
The studio is made of imported mirror panel top-grade SUS304 stainless steel, and the outer tank of the box is sprayed with A3 steel plate
.

3.
The ultra-fine insulation cotton is filled between the outside of the box and the inner tank, which has a good temperature insulation effect, effectively reducing the temperature fluctuation rate in the experimental box, and with the tight sealing of anti-aging silicone rubber sealing strips, the box body is free of fog Leakage occurs
.

4.
Due to the harsh environment in the experimental box, in order to observe the situation in the experimental box clearly, Wuhan Shangshi chooses multi-layer tempered glass for the observation window, and sets up separate lighting lamps and fog brushes in the observation window to maintain good quality.
Observe the field of vision and monitor the test situation at any time
.
Of course, in order to collect test data, the box is specially equipped with a test hole with a diameter of 50mm, which can be connected to recorders, printers and computers
.


1.
When preparing
the environmental test of the constant temperature and humidity test box before use, be familiar with the sample performance, test conditions/test procedures and test techniques required for the test, and must be familiar with the technical performance of the test equipment used.
Familiar with the structure of the equipment, especially the operation and performance of the controller
.
Read the operation manual of the test equipment carefully to avoid the abnormal operation of the test equipment caused by the operation error, which will cause the damage of the test sample and the incorrect test data
.

2.
Reasonable selection of constant temperature and humidity test box test equipment
In order to maintain the normal operation of the test, appropriate test equipment should be selected according to the different conditions of the test product, and a reasonable ratio should be maintained between the test sample and the effective volume of the test box
.
For the test of the heating test sample, its volume should not be greater than one tenth of the effective volume of the experimental box
.
For non-heating test samples, the volume should not be greater than one-fifth of the effective volume of the experimental box
.
For example, when a 21` color TV is doing a temperature storage test, a one-cubic-volume experimental box can meet the requirements, but when it is powered on, it cannot meet the requirements, and it should be replaced with a larger experimental box.
Because the TV emits heat when it is working
.

3.
Correct placement of test
samples The placement position of the test samples in the Changfeng constant temperature and humidity experiment box should be more than 10cm away from the box wall, and multiple samples should be placed on the same plane as much as possible
.
The sample placement should not block the air outlet and return air outlet, and a certain distance should also be reserved for the temperature and humidity sensor
.
to maintain the correct test temperature
.

4.

There are certain requirements for the use of wet ball gauze (wet ball paper) in the wet heat test box.
Not any gauze can be used instead, because the reading of relative humidity is the difference between the root distance and the temperature and humidity.
Strictly speaking, it is also related to Local atmospheric pressure and wind speed at that time
.
The wet bulb temperature indication is related to the amount of water absorbed by the gauze and the evaporation of the surface
.
These are directly related to the quality of gauze.
Wet ball gauze is made of flax and uses "wet ball gauze"
.
In order to avoid the wet bulb thermometer (humidity) being incorrect, the gauze length of the wet bulb gauze should be: 100mm, the sensor probe should be tightly wound, the probe should be 20-30mm away from the humidity water cup, and the gauze should be immersed in the water cup to maintain the correctness of equipment control and humidity control.
correctness
.

5.
Correctly add the medium environment test in the constant temperature and humidity test box test
If there are certain requirements for the water used in the humid heat test box, the resistivity of the water used in the test box should not be lower than 500 ohms.
Generally, the resistivity of tap water is 10--100 ohms, the resistivity of distilled water is 100--10000 ohms, and the resistivity of deionized water is 10000-100,000 ohms.
Therefore, Distilled water or deionized water should be used for the damp heat test water, and it must be fresh, because water is easily contaminated by carbon dioxide and dust after contacting with air, and water has the property of dissolving many substances.
drop
.