The temperature uniformity of the constant temperature and humidity test chamber is unqualified

NOKI Chamber am10:18

The temperature uniformity of the constant temperature and humidity test chamber is unqualified

The temperature uniformity of the constant temperature and humidity test box is a key performance index of the machine and equipment, and this index value immediately harms the result of the experiment. So what caused the temperature uniformity to not reach the standard specification?

1. The difference of the overall test objectives in the working room of the constant temperature and humidity chamber: If the working room of the constant temperature and humidity chamber is equipped with a test sample that is considered to harm the overall internal convective heat transfer, it will definitely harm the uniformity of the internal temperature to a certain level, That is, the temperature uniformity. Such as LED lighting products, the product itself has luminescence and heat, which becomes a heat load, so the temperature uniformity is very harmful.

2. Difficulties in the overall planning make it difficult for the internal structure and overall planning of the indoor space of the constant temperature and humidity test box to achieve a symmetrical structure, and such different structures will definitely cause deviations in the internal temperature uniformity. This key is reflected in the overall planning of sheet metal parts and the processing level of sheet metal parts, such as the overall planning of the air duct, the placement direction of the heating tube, the output power of the centrifugal fan, etc., which will endanger the temperature uniformity of the box body.

3. Due to the different structure of the inner cavity of the constant temperature and humidity test box, the temperature of the inner cavity of the test chamber will also be uneven, which will endanger the convective heat transfer in the working room and produce deviations in the uniformity of the internal temperature.

Constant temperature and humidity test box can not quickly cool down the enumeration method

1. Because the temperature and humidity are persistent or the ultra-low temperature cannot be reached, investigate whether the refrigeration unit can be restarted during the entire operation of the machine and equipment, and the refrigeration unit can be restarted during the entire operation of the machine and equipment, indicating the home of each refrigeration compressor The electrical appliances and routes are all normal, and there is no doubt about the software level of the matching and operating electronic components.

2. Touch the exhaust pipe and breathing pipe of the R404 refrigeration compressor of the main generator set with your hands (pay attention to scalding or freezing, touch it gently first), if you find that the temperature of the exhaust pipe of the refrigeration compressor is not high, The temperature of the return bronchus line is not very cold (no frost), which also indicates that the refrigeration unit lacks refrigerant.

3. In the whole process of application, the door of the test box cannot be closed normally;

4. Working temperature is too high: If the room temperature is too high, you need to find ways to lower the working temperature, such as installing central air-conditioning in the room or turning on the bottom partition to blow with a cooling fan, and then achieve the actual effect of reducing temperature.

Non-standard constant temperature and humidity test chamber-HF-8015

Analysis and Solution of Common Alarms in Constant Temperature and Humidity Test Chamber

Analysis and solutions of common alarms in constant temperature and humidity chambers and constant temperature and humidity test chambers

1. Why are some customers helpless about the alarm of the constant temperature and humidity chamber/constant temperature and humidity test chamber?

Answer: In fact, machinery and equipment have an alarm function. It is the actual operation of the actual operation staff during the actual operation. When there is an error in the actual operation, it will alarm and automatically disconnect the switching power supply to stop working. In this chapter, I will analyze several possible aspects of the constant temperature and humidity test chamber alarm and solutions together with everyone:

1. Overheating alarm in the box

Alarm reason: The sensor in the sample area and the safety passage are equipped with overheat protection equipment, and the actual operation control panel is equipped with overheat protection equipment. When the temperature in the pilot area exceeds the allowable temperature set on the control panel, constant temperature and humidity test The box shuts down and alarms.

Solution: Be sure to set the highest temperature 10℃ made by TH before the machinery and equipment can work.

2. The sample overheating maintenance alarm:

Alarm reason: when the temperature in the test area exceeds the maintenance temperature set by the control panel, the machine will shut down and give an alarm

Solution: Make sure that the common faults are cleared and the machine equipment can operate normally after calibration. The overheating maintenance of the test product is divided into limited maintenance and low-limit maintenance, and the customer can set it as necessary.

3. Centrifugal fan over temperature alarm:

Alarm reason: When the electromagnetic coil of the centrifugal fan is overheated, the machine and equipment will shut down and give an alarm

Solution: The equipment must be repaired only after the common faults are cleared.

When the constant temperature and humidity test chamber is in operation, the failure English display information alarm and solutions:

1. The alarm display information is DRY HEAT, it is that the centrifugal fan is broken, and the temperature cannot be controlled. At this time, the centrifugal fan should be removed and replaced.

2. The alarm constant temperature and humidity test box displays the information WETHEAT, which is caused by the blockage of the tap water pipe, which causes the temperature to be abnormal. At this time, it needs to be cleared and the tap water pipe is passed.

3. The alarm display information is R23H, which is high pressure maintenance. At this time, the cooler should be cleared or the refrigerant leakage is more serious, and it should be reported to the manufacturer immediately

4. The alarm display information is REFERR1, which is refrigeration compressor 1 over-current protection. At this time, the cooler should be cleared or the refrigerant leakage is serious, and it should be reported to the manufacturer immediately

5. Alarm REFERR2, it is the refrigeration compressor 2 over-current protection. At this time, the cooler should be cleared or the refrigerant leakage is more serious, and it should be reported to the manufacturer immediately

6. The alarm display information is that the water tank of the WATERRPE water tank is low, and the centrifugal water pump is broken. Here you need to check whether the water storage tank is low. If it is, please fill in the water flow (above 2/3, more than 10L, or replace the centrifugal pump)

7. Alarm NO POWER switching power supply is under-phase, zero-line and live-wire. At this time, check whether it is under-phase or reverse-phase installation and whether the supply of switching power supply is normal. If the phase is under phase, check whether the route is caused by the line at this time. If it is, please repair it. If the phase is reversed, check whether the line of the constant temperature and humidity test box is incorrectly inserted during installation. Please replace the two adjacent power plugs to remove them.

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