Explosion proof high and low temperature circulation devices are widely used in flammable and explosive environments such as chemical and pharmaceutical industries. Their core function is to achieve precise temperature control through refrigeration and heating systems, ensuring safe and efficient experimentation or production. However, due to the complexity of the equipment and harsh operating conditions, common faults may affect performance and even pose safety hazards. This article systematically summarizes typical fault phenomena, causes, and solutions to help users quickly diagnose and maintain them.
1、 Electrical system malfunction
phenomenon descriptionThe device cannot start or suddenly shuts down during operation, accompanied by abnormal power indicator lights.
Possible reasonsPower connection failure, blown fuse, or damaged control system module.
solution：
•Check if the power cord is securely connected to ensure stable voltage.
•Replace the burnt fuse, and if the problem occurs repeatedly, check the circuit for a short circuit.
•Contact professional technicians to repair the controller or replace faulty modules, and avoid disassembling explosion-proof components on your own.
2、 Temperature control system malfunction
phenomenon descriptionThe temperature fluctuates greatly, unable to reach the set value, or displays abnormally.
Possible reasonsSensor drift, controller logic error, or poor environmental heat dissipation.
solution：
•Calibrate or replace the temperature sensor to ensure detection accuracy.
•Restart the control system and update the software to fix logical errors.
•Clean the cooling fan and ventilation openings to prevent dust accumulation from causing overheating.
3、 Abnormal refrigeration system
phenomenon descriptionCooling efficiency decreases, high/low pressure gauge readings are abnormal, or compressor noise increases.
Possible reasonsRefrigerant leakage, compressor wear or condenser blockage.
solution：
•Use a leak detector to locate the leak point, repair it, and refill the refrigerant.
•Check the condition of the compressor lubricating oil and replace worn bearings or motor components.
•Clean the condenser fins to ensure smooth airflow and avoid insufficient heat dissipation.
4、 Heating system malfunction
phenomenon descriptionSlow heating rate or inability to raise temperature, accompanied by abnormal odor.
Possible reasonsAging of electric heating elements, loose wiring, or failure of heat exchange in reaction vessels.
solution：
•After cutting off the power, check the resistance value of the heating element and replace the burnt parts.
•Tighten the electrical connection points to prevent arcing caused by poor contact.
•Clean the inner wall of the reaction vessel to eliminate contamination of the heat transfer medium.
5、 Circulating liquid pump problem
phenomenon descriptionInsufficient circulating fluid flow or severe pump body vibration.
Possible reasonsImpeller blockage, motor malfunction, or worn seals.
solution：
•Disassemble the pump body to remove foreign objects and ensure smooth rotation of the impeller.
•Test the motor winding and replace damaged insulation components.
•Update the mechanical seal to prevent leakage from causing a decrease in explosion-proof performance.
6、 Explosion proof structure failure
phenomenon descriptionLeakage at the sealing point of the shell or damage to the explosion-proof surface.
Possible reasonsSealing ring aging, external impact or corrosion.
solution：
•Regularly replace high-temperature resistant seals to ensure that the explosion-proof gap meets the standards.
•Check the integrity of the shell and repair any cracks or deformations.
•Choose stainless steel components in corrosive environments to extend their lifespan.
7Preventive maintenance recommendations
regular inspectionMonthly testing of explosion-proof performance, including airtightness and explosion-proof surface condition.
environmental controlMaintain good ventilation around the equipment to avoid the accumulation of dust or moisture.
Professional SupportComplex faults (such as compressor maintenance) need to be handled by authorized service providers to ensure the validity of explosion-proof certification.
Through systematic troubleshooting and standardized maintenance, the reliability of explosion-proof high and low temperature circulation devices can be significantly improved, ensuring operational safety in high-risk environments.