Common faults and solutions of constant temperature and humidity test chamber

NOKI Chamber am9:27

Common problems and treatment of constant temperature and humidity test chamber:

Because the volume of the constant temperature and humidity test chamber is relatively large, it is not convenient to move or move, and the power circuit is complicated. When common faults occur, customers are usually unable to start. To better customers can quickly distinguish and deal with common faults by themselves, the details are described below. Some common problems and solutions for the maintenance of constant temperature and humidity test chambers. When the temperature and humidity controller displays information and the temperature is abnormal, please check the overheating protection device of the operation panel. Are the constant temperature and humidity test chamber set at 150℃? Please check if the circulation system motor in the main room is damaged and not running. Check if the intermediate relay of the temperature part is damaged and short-circuited. If the electric heater is not damaged, please use the AC gear of the three-purpose watt-hour meter, and open the working voltage gear to the position of 600 amperes. Put the red and black rods on the middle relay with the wire number marked as T to communicate with each other. , Set the temperature preset value of the temperature part to 0℃. At this time, the indicator light of the intermediate relay of the temperature part is not easy to flicker. If the measured working voltage value does not change, staying below 10V means that the intermediate relay is damaged and shows a short-circuit fault. Happening.

Common failures of refrigeration in high and low-temperature test chambers:

At first glance, it refers to querying the marked values ​​of each instrument and equipment, such as vapor pressure, temperature, current, etc., querying the operation and maintenance records of machinery and equipment, and querying the condition of frost or condensate on the surface of the breathing tube and air-conditioning evaporator.

The second listening means listening to the sound of the refrigeration compressor of the alternating high and low-temperature box, listening to the fluidity of the refrigerant in the expansion valve of the air conditioner, and listening to the operating conditions and abnormal phenomena of the machinery and equipment reflected by the manager.

The third touch is to touch the heating and cooling levels of the system software pipelines and related components, and the vibration conditions of the machinery and equipment during operation.

Analysis refers to the application of relevant basic theories of refrigeration equipment to analyze common fault conditions that appear, distinguish, and find the cause.

Method of applying constant temperature and humidity test chamber

  • High temperature:

Introduction: The high-temperature experiments described in this specification apply to two types of test products, heat rejection, and non-heat rejection. The purpose of this high-temperature experiment is only to specify the adaptability of parts, machinery, and equipment, or other commodities in the application or storage of high-temperature natural environment standards.

This high-temperature experiment cannot be used to comment on the temperature transition resistance of the experimental sample and the professional ability during the temperature transition period. In this type of situation. It is reasonable to choose experiment N: temperature transition experiment method.

The high-temperature experiment method is divided into non-exhaust heat experiment sample high-temperature experiment: experiment Ba: sudden temperature change; experiment Bb, temperature gradient. Heat rejection experiment sample high-temperature experiment: experiment Bc: sudden temperature change; experiment Bd: temperature gradient. This experimental method is generally used for experimental samples that can achieve a stable temperature during the standard experimental period.

  • Ultra-low temperature:

Introduction: The ultra-low temperature experiments involved in this specification can be used for two types of experimental samples, non-heat rejection, and heat rejection. Regarding the non-exhaust heat test products, the tests Aa and Ab do not violate the initial release specifications. This specification is only used to evaluate or clarify the adaptability of electric welders and electronic equipment (including parts, machinery and equipment, and other commodities) to storage and/or application under ultra-low temperature natural environment standards.

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