High and low temperature coolant tester is a device used to test the performance of various materials, parts or products in high and low temperature environments. However, in the process of use, sometimes there will be low-voltage alarm and other faults, affecting the normal conduct of the test. This paper will discuss the causes of low pressure alarm of high and low temperature coolant tester and the corresponding troubleshooting methods.

　　First, low-voltage alarm cause analysis

　　1, insufficient coolant: when the coolant level is lower than the minimum required by the equipment, the low pressure alarm will be triggered. Check the coolant tank to make sure there is enough coolant in it.

　　2, coolant leakage: coolant leakage in the equipment will also lead to low pressure alarm. In this case, the coolant system, including piping, joints, and seals, needs to be inspected to identify and repair leaks.

　　3, pump failure: coolant pump abnormal work may lead to low pressure alarm. At this time, it is necessary to check the working state of the pump to ensure its normal operation.

　　4, sensor failure: pressure sensor or its line failure may lead to false low voltage alarm. In this case, you need to check the function of the sensor and its connection line to ensure that it works properly.

　　5, control system failure: equipment control system failure may also lead to low-voltage alarm. In this case, the control system needs to be inspected and repaired.

　　2. Troubleshooting methods

　　1, check the coolant level: when the equipment sends a low pressure alarm, first check the coolant level in the coolant tank. If the liquid level is too low, the coolant should be added to the specified liquid level in time.

　　2, check the coolant system: if the coolant is sufficient, but there is still a low pressure alarm, there may be a leak in the coolant system. At this time, pipes, joints and seals should be inspected to find and repair leaks.

　　3, check the working status of the pump: confirm whether the coolant pump is working normally. If the pump fails, it should be replaced or repaired in time.

　　4, check the sensor and its line: check the pressure sensor and its connection line to ensure that it works normally. If the sensor or its wiring is found to be faulty, it should be replaced or repaired.

　　5, check the control system: if the above checks are normal, it may be the control system of the equipment is faulty. At this time, the control system should be inspected and repaired to ensure its normal operation.

　　6, preventive maintenance: In order to avoid the recurrence of similar failures, preventive maintenance should be carried out regularly on the equipment, including checking the status of the coolant system, pumps, sensors and control systems, and timely replacement of worn or aging parts.

　　7, operation training: to ensure that the operator is familiar with the equipment operating procedures and common troubleshooting methods. Regular training to improve the skill level of operators, so that they can better cope with various fault situations.

　　8, establish fault records: In order to facilitate the tracking of the operating status and fault history of the equipment, a fault record system should be established. Record the occurrence time, cause, and handling method of each fault for analyzing device performance and improving maintenance policies.

　　9, Maintain contact with suppliers: maintain good communication with equipment suppliers, timely access to equipment technical support, spare parts supply and maintenance services and other resources, to ensure that the equipment in the event of failure can be timely and effective treatment.