Superheat reflects temperature difference between refrigerant vapor and saturation state at coil outlet. Stable superheat ensures safe evaporator running. Sensor aging, loose installation or thermal insulation damage will cause measured superheat value to drift away from real working condition. Xindacool controller supports manual superheat parameter checking, allowing on-site calibration of temperature and pressure sensors. A drifting superheat reading misleads expansion valve action. The valve may feed too much or too little liquid refrigerant into coil. Too low actual superheat brings risk of liquid return to compressor. Excessively high superheat wastes most of coil heat exchange surface. Sensor probe surface should be kept clean. Ice, dust or corrosion layer on probe weakens thermal contact with suction pipe. When replacing temperature or pressure sensors, use the same specification model. Different sensor characteristics cause reading deviation. Calibration work should be done under stable operating load. Do not perform calibration during defrost or product loading phase. Wiring resistance change over long operation also contributes to signal drift. Damaged shielding wire introduces signal interference. After calibration, keep system running for several hours and recheck readings. This confirms superheat maintains steady state under load. Seasonal ambient variation may slowly shift superheat working point. Annual maintenance should include sensor calibration routine.
Q: What will superheat drift bring to evaporator? A: Expansion valve receives wrong feedback and supplies improper refrigerant flow. Q: Why clean temperature sensor probe? A: Ice, dust and corrosion reduce thermal contact with suction pipe and distort readings. Q: When is the proper time for sensor calibration? A: When the refrigeration system works under stable thermal load. Q: What risk if real superheat is too low? A: Liquid refrigerant can flow back and damage compressor. Q: What happens with excessive superheat? A: Large portion of coil surface cannot be used for heat exchange. Q: Can different sensor models replace each other directly? A: No, mismatched sensor specifications create measurement deviation. Q: What else besides sensor aging causes signal drift? A: Wiring aging and electromagnetic interference from broken shielding cable. Q: How often to check and calibrate superheat sensors? A: Sensor calibration should be arranged during annual maintenance.
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Email:michelle@xindacool.com
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