Explain the use steps, maintenance and maintenance of high and low temperature wet heat alternating test chamber

Selection, maintenance and maintenance of high and low temperature wet heat alternating test chamber :

The constant temperature and humidity test chamber is a high-low temperature alternating heat and humidity test chamber that combines high and low temperature test chambers and moist heat. It is more difficult to repair than other environmental test equipments and is representative.

High and low temperature wet heat alternating test chamber operating procedures

First, the use of high and low temperature wet heat alternating test chamber :

1. Place the test sample on the sample holder in the test chamber.

2. Turn on the power "ON" on the panel.

(1) If the test temperature is 50° humidity 95% time 5 hours, click “Directory” “Operational setting” in the upper left corner of the meter and then click “Fixed value” after “Running mode”, then click “Table of Contents” in the upper left corner to make an appointment. set up". The date adjustment is followed by (starting time) year, month, day, hour, and minute. Click on the number in the box, there are a lot of numbers below, and you need to click on it. Then click “ENT (Confirm)” to set the completion and return; if not, click “ESC (Back)” to make the appointment time to the end of the test. After setting it, click “ON” after the reservation setting. Finally, click on the "Directory" point in the upper left corner of the "Monitor Screen", and the "Directory", "Setting Stop", "Switch (Screen)" appears, and 2 rows of numbers appear in the box under the temperature. Point 40 and ENT, then click on the humidity box to display 2 rows of numbers, point 95 and ENT. Click "Run" in the lower right corner. The equipment can start the above test requirements.

(2) If the test temperature is: 40 degrees for 5 hours, and then the test temperature is 60 degrees for 3 hours, then 3 cycles:

Step 1: Click on the “Directory” “Operational Settings” in the upper left corner of the meter, then click “Program” after “Run Mode” and then click “Table of Contents” in the upper left corner to “Program Settings” and “Program Edit”. The program number will appear. (There is a memory function). Number of segments Temperature and humidity time TS1 TS2 TS3 TS4. There are 01-04 under the number of segments.

The second step, the third step, the fourth step, the fifth step, the sixth step, see the above steps and icons

Second, the high temperature and low temperature wet heat alternating test chamber use precautions:

1. Do not open the door under the premise of the test (be careful of burns).

2. It is not allowed to operate the machine by non-testers.

3. It is not allowed to work when the equipment has an alarm sound.

4. It is not possible to start the compressor frequently (to reduce the life of the compressor).

5, pay attention to the water tank can not be lacking, this will burn the heating tube.
6, can not change the parameters inside the instrument.
Third, the purchase, maintenance and maintenance of high and low temperature alternating heat and humidity test chamber

a) The structure of the high and low temperature alternating heat and humidity test chamber is composed of a box body, a wind circulation system, a refrigeration system, a heating system and a humidity control system. The air circulation system generally adopts a structure that can adjust the direction of air supply; the humidification system adopts two types of boiler humidification and surface evaporation; the cooling and dehumidification system adopts an air conditioning working condition refrigeration structure; the heating system adopts electric heating fin heating and electric furnace direct heating. Structure; temperature and humidity test method adopts dry and wet ball test method, and also uses humidity sensor direct measurement method; control and display operation interface adopts temperature and humidity separation independent and temperature and humidity combination controller.

b) Some common faults and troubleshooting methods for high and low temperature alternating heat and humidity test chambers

â—†High and low temperature alternating heat and humidity test chamber In the high temperature test, if the temperature change does not reach the test temperature value, the electrical system can be inspected and the faults can be eliminated one by one. If the temperature rises very slowly, it is necessary to check the air circulation system to see if the regulating baffle of the wind cycle is normal. On the contrary, check whether the motor of the wind cycle is running normally. If the temperature is too high, you need to set the PID setting parameters. If the temperature rises directly and the temperature is over-protected, then the controller fails and the control instrument must be replaced.

â—†The low temperature and low temperature alternating heat and humidity test chamber can not reach the test index, then you must observe the temperature change, the temperature drop is very slow, or the temperature has a rising trend after the temperature reaches a certain value, the former should check it. Whether to dry the working chamber before the low temperature test, keep the working chamber dry, and then put the test sample into the working room and then test it. If the test sample in the working room is placed too much, the wind in the working room cannot be fully circulated. After eliminating the above reasons, it is necessary to consider whether it is a fault in the refrigeration system. The rotor pump should be inspected by professional personnel of the manufacturer. The latter phenomenon is caused by the poor use of the equipment. The ambient temperature at which the equipment is placed and the location where it is placed (the distance between the rear of the cabinet and the wall) must meet the requirements (as specified in the operating instructions for the equipment).

â—†High and low temperature alternating heat and humidity test chamber In the damp heat test, the actual humidity will reach 100% or the actual humidity will be very different from the target humidity. The value is much lower. The former phenomenon may be caused by the drying of the gauze on the wet bulb sensor. Then, check whether there is water shortage in the water tank of the wet bulb sensor. The water level in the water tank is automatically controlled by a water level controller. Check whether the water supply system of the water level controller is normal and the water level controller works normally. Another possibility is that the wet gauze is hardened due to the long use time or the purity of the water supply, so that the gauze becomes hard and the gauze can not absorb moisture and is dry. The above phenomenon can be eliminated by replacing or cleaning the gauze. The latter phenomenon is mainly because the humidification system does not work. Check the water supply system of the humidification system, whether there is a certain amount of water in the water supply system, whether the water level control of the humidification boiler water level is normal, and whether the water level in the humidification boiler is normal. If everything above is normal, then check the electrical control system, which should be repaired by professional maintenance personnel.

â—†When the equipment suddenly fails during the test operation, the corresponding fault display prompt appears on the control meter and there is an audible alarm prompt. The operator can quickly check which type of fault is involved in the troubleshooting chapter of the operation of the equipment, and then ask the professional to quickly eliminate the fault to ensure the normal operation of the test. Other environmental testing equipment will have other phenomena in use, and it will be specific phenomena, specific analysis and elimination.

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