A thermal laboratory is usually made up of factories, equipment bases, and auxiliary equipment and control systems.
Heating is done by electric heating resistance wire or electric tube; In addition to natural heating for hot and cold heating without heating, ventilation devices are often used to provide air for forced circulation. The air supply mode is mainly top side supply and bottom side return or full orifice top supply and bottom side return, which is very important for the uniformity of the whole air room. ‘text.
The control system now generally adopts PID mode, so the heating power is automatically adjusted to control the deviation between the actual temperature and the set temperature, realizing steeples adjustment and small temperature fluctuation; The display part has also been upgraded from the previous digital display mode to an LCD touch screen, which is clear, beautiful and convenient to use. In addition, the cover of the equipment is made of wool or polyurethane foam, which has low heat resistance. Thermocouple, platinum resistor and thermistor are used for temperature sensing and accurate measurement.
How to choose a thermal laboratory?
1.It must be required that the end of the test meets the maximum test of the possibility of failure of the product, that is, the high box or the low box or the hot cold box will meet the temperature limit. Specific to the test requirements.
2.The selection of the laboratory should follow the principle that the sample volume does not exceed 1/5 of the working volume of the laboratory.
3.In order to ensure the uniformity of the temperature of the test area, the diffusion method is selected either forced or negative according to the temperature of the sample. When using large samples or testing many samples at the same time, the test results from different conditions will be very different.
4.There are two ways to measure the temperature of a sample: a down-flow sensor and a down-flow sensor. The location and control system of the temperature control sensor can be selected, and the appropriate equipment will be selected according to the research requirements.
5.In order to prevent the sample from absorbing or giving off heat due to heat radiation or conducting heat to the test area, heating or cooling of the equipment should not affect the sample.
6.It’s easy to save and check. Automatic counters, indicating lights, recording equipment, automatic stops and other equipment should be installed during the cycle test.
7.To facilitate the installation of the sample, the sample can be placed or hung, and the performance of the sample will not change due to changes in surface and low temperature.
8.Leads the hole to lead the test light in the equipment industry.
9.There should be safeguards against damage checks and security tested by users. For example, inspection windows and lights are used, as well as protection devices such as seasonal failure, water shortage, heat protection and fire protection.
10.If the monitoring function is necessary.
Be careful when using the heat lab
1.Temperature and humidity changes will occur in ups and downs during the bulk sampling test, so the sampling location should be carefully considered. It should be kept as central as possible to the laboratory work area.
2.Be careful to confirm the temperature of the test sample in the test area.
3.In order to keep the temperature in the temperature zone constant, it is necessary to ensure that the minimum change of the temperature of the environment under test and the power of the equipment is as possible, to ensure that the test test is not produced.
4.The radiation heats up and does not heat up, to ensure the stability of the temperature in the test area. When the end of the test comes out of the laboratory temperature, quickly removing the sample will create unnecessary stress on the sample and may produce unexpected results.
5.Therefore, the test sample must be good enough to reach the room before it is removed.
Conclusion
Environmental testing is a process that can add value to a product, which cannot be ignored. As one of the most important environmental tests, temperature-dependent environmental tests are used in many places, which improve the environmental flexibility and reliability of military products. And ordinary people, and leads directly to an increase in the stock market.
