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High and low temperature should be used with the process, there are many considerations, but also often need maintenance, 

This will prolong the life of the chamber, the test machine. The following describes the precautions and maintain constant temperature and humidity chamber

1. be sure to check the water before doing the test tube level is not too high, nor too little. The water overflow tube or low water wet absorbent cloth ball test is not normal, affecting the accuracy of the wet ball to keep the water level about six points full. Adjust the water level of the tube, adjust the level of the water box. Almost one in every two of three tests done on the need to check and add water. You can see the water in front of the water pipe, which did not, the machine will alarm and stop working.

2.the machine to machine side with test holes, using the test circuit when connected to the box.

3.the test when changes observed inside the situation, can be indoor light (LIGHT) switch is turned Ruoyu through window inside knowledge of the change of circumstances.

4.if the operation of the machine below 0 ℃, should try to avoid opening the door, because doing low, if open ice closed the door could easily lead to the phenomenon of internal evaporator and other parts of it, especially the lower the temperature the more serious condition, If it must be open, it should try to shorten the opening hours.

5. when the low temperature operation is completed, be sure to set the temperature of 60 ℃ purposes and dried for about half an hour, so as not to affect the determination of the time the next job or icing conditions.

6.the heat sink of ice machine (condenser) should be regularly maintained and kept clean.

7. humidification barrels into the water, it must complete the remaining discharge of air to water can not enter.

After the completion of the low temperature operation of the machine, without the above point 6 work, but also be sure to set normal temperature (30 ± 5 ℃) so that the temperature inside it at the time of shutdown to room temperature, so as not to affect the inside temperature is very low and generated icing, as well as window glass fogging phenomenon.

8. to operate them, unless absolutely necessary, do not open the door, it may result in the following consequences:

- The moisture out of the box outside temperature is very dangerous.

- The inside of the door still holding high temperature damage.

- Hot air may trigger a fire alarm malfunction.

9. please note that this machine must be safe indeed grounded to avoid electrostatic induction.

10. avoid close within three minutes and then turn on the frozen unit.

11. if the fever is placed inside the sample, the sample using the external power supply control, do not use direct power of this machine.

12. a circuit breaker, temperature overtemperature protection, provides native test product to the operator's safety, so please check regularly.

13.the correct means of wet gauze ball, in order to ensure that the correct amount of relative humidity. 

14. the absolute prohibition of tests of explosive, flammable and highly corrosive substance.

15.please read the control instructions and relevant instructions before operating constant temperature and humidity.