Analysis of the use of cold and thermal shock test chamber and the cause of failure
1. The thermal shock test chamber should be cleaned once during the use. Generally, this time is 3 months. For air-cooled cooling of the refrigeration system, the condenser fan should be regularly checked and the condenser should be installed. Decontamination and dedusting is carried out to ensure good ventilation and heat transfer performance; for water-cooled cooling of the refrigeration system, in addition to ensuring that the water inlet pressure and inlet water temperature are within the specified range, the corresponding flow rate must also be ensured, and the condenser should be periodically The interior is cleaned and descaled to obtain its continuous heat transfer performance.
2. If the thermal shock test chamber is used for a long period of low temperature, each time a cycle is completed, the temperature should be set to 110 degrees, and the door should be opened for two hours for a small time. At the same time, it should be adhered to after the completion of each test, set the temperature near the ambient temperature, work for about 30 minutes, then cut off the power supply and wipe the inner wall of the working chamber.
3. Regularly clean the evaporator: Due to the different cleanliness level of the sample, under the effect of forced air circulation, a large number of small particles such as dust will be condensed on the evaporator, and should be cleaned regularly. Low temperature test chamber circulation fan, condenser fan cleaning and calibration: similar to the cleaning evaporator, due to the different working environment of the test chamber, small particles such as dust will be condensed on the circulating fan and condenser fan, which should be carried out regularly. Cleaning.
4, hot and cold impact test box waterway, humidifier cleaning: If the water path is not smooth, the humidifier scaling is likely to cause the humidifier to dry, may damage the humidifier, so the waterway, humidifier must be cleaned regularly.
5. When using the thermal shock test chamber , if it needs to be moved, it should be carried out under the guidance of technical personnel to avoid damage to the equipment. If the customer relocates, be sure to have a professional electrician to confirm that the circuit is correct and then start up, otherwise Will burn out equipment related components.
6. Long-term shutdown is not used. It should be energized every half month regularly. The power-on time is not less than 1 hour. It is tested whether the equipment related parts are running normally. The thermal shock test chamber is mainly used in various production industries to meet the reliability test of various industries. R & D and manufacturing of the instrument, in the actual operation failure is inevitable, in order to avoid the failure of high and low temperature impact test chamber will affect the entire production system, the maintenance staff should find out the relevant fault problems in a timely manner.
Failure analysis of the thermal shock test chamber:
The first fault problem:
Whether the test box used in the system uses electric meters to measure, indicate and control the temperature. If the answer is affirmative, it means that the measured quantity of the system meter has a certain hysteresis.
The second fault problem:
The thermal shock test chamber system usually does not have a limit indication value, so once the limit temperature value occurs, it can generally be judged as a temperature meter system failure. Temperature instrumentation systems are rarely subject to sudden changes, which are due to the hysteresis of the system itself, so sudden temperature changes are mostly due to thermocouples, RTDs, compensating wire breaks or transmitter amplifier failures.
The third fault problem:
The thermal shock test chamber is used if it exhibits rapid vibration of temperature values, mostly because of improper adjustment of the control parameter PID. If there is a slow fluctuation in the test instrument, the cause is mostly the process operation problem. If the process operation is excluded, the instrument itself is faulty.
The fourth fault problem:
The problem of the system itself generally shows that there is no change of the control signal. According to the condition of these control signals, the fault can be judged. If the input signal of the system regulating valve is unchanged, the diaphragm of the valve head diaphragm is leaked, and the signal of the system regulating valve positioner is unchanged. If the fault occurs in itself or the system regulator output signal fails, the regulator itself will malfunction.
1. The thermal shock test chamber should be cleaned once during the use. Generally, this time is 3 months. For air-cooled cooling of the refrigeration system, the condenser fan should be regularly checked and the condenser should be installed. Decontamination and dedusting is carried out to ensure good ventilation and heat transfer performance; for water-cooled cooling of the refrigeration system, in addition to ensuring that the water inlet pressure and inlet water temperature are within the specified range, the corresponding flow rate must also be ensured, and the condenser should be periodically The interior is cleaned and descaled to obtain its continuous heat transfer performance.
2. If the thermal shock test chamber is used for a long period of low temperature, each time a cycle is completed, the temperature should be set to 110 degrees, and the door should be opened for two hours for a small time. At the same time, it should be adhered to after the completion of each test, set the temperature near the ambient temperature, work for about 30 minutes, then cut off the power supply and wipe the inner wall of the working chamber.
3. Regularly clean the evaporator: Due to the different cleanliness level of the sample, under the effect of forced air circulation, a large number of small particles such as dust will be condensed on the evaporator, and should be cleaned regularly. Low temperature test chamber circulation fan, condenser fan cleaning and calibration: similar to the cleaning evaporator, due to the different working environment of the test chamber, small particles such as dust will be condensed on the circulating fan and condenser fan, which should be carried out regularly. Cleaning.
4, hot and cold impact test box waterway, humidifier cleaning: If the water path is not smooth, the humidifier scaling is likely to cause the humidifier to dry, may damage the humidifier, so the waterway, humidifier must be cleaned regularly.
5. When using the thermal shock test chamber , if it needs to be moved, it should be carried out under the guidance of technical personnel to avoid damage to the equipment. If the customer relocates, be sure to have a professional electrician to confirm that the circuit is correct and then start up, otherwise Will burn out equipment related components.
6. Long-term shutdown is not used. It should be energized every half month regularly. The power-on time is not less than 1 hour. It is tested whether the equipment related parts are running normally. The thermal shock test chamber is mainly used in various production industries to meet the reliability test of various industries. R & D and manufacturing of the instrument, in the actual operation failure is inevitable, in order to avoid the failure of high and low temperature impact test chamber will affect the entire production system, the maintenance staff should find out the relevant fault problems in a timely manner.
Failure analysis of the thermal shock test chamber:
The first fault problem:
Whether the test box used in the system uses electric meters to measure, indicate and control the temperature. If the answer is affirmative, it means that the measured quantity of the system meter has a certain hysteresis.
The second fault problem:
The thermal shock test chamber system usually does not have a limit indication value, so once the limit temperature value occurs, it can generally be judged as a temperature meter system failure. Temperature instrumentation systems are rarely subject to sudden changes, which are due to the hysteresis of the system itself, so sudden temperature changes are mostly due to thermocouples, RTDs, compensating wire breaks or transmitter amplifier failures.
The third fault problem:
The thermal shock test chamber is used if it exhibits rapid vibration of temperature values, mostly because of improper adjustment of the control parameter PID. If there is a slow fluctuation in the test instrument, the cause is mostly the process operation problem. If the process operation is excluded, the instrument itself is faulty.
The fourth fault problem:
The problem of the system itself generally shows that there is no change of the control signal. According to the condition of these control signals, the fault can be judged. If the input signal of the system regulating valve is unchanged, the diaphragm of the valve head diaphragm is leaked, and the signal of the system regulating valve positioner is unchanged. If the fault occurs in itself or the system regulator output signal fails, the regulator itself will malfunction.
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