In systems where the oil outlet temperature is regulated by a temperature control valve at the steam inlet of the heat exchanger, the stainless steel explosion-proof heater is used to help maintain stable oil temperature. On-site operation and maintenance personnel often encounter problems such as insufficient heating power, abnormal temperature, and low insulation. This article provides troubleshooting and handling solutions for common faults of the FBR-28 product.
First check whether the heating element and power supply circuit are open or have poor contact, then use a multimeter to measure the resistance value to determine whether the element is damaged. If the circuit is normal, check the set value of the temperature regulator and the status of the sensor. After long-term operation, scale may accumulate on the surface of the heating element, affecting heat dissipation, so the element group needs to be cleaned. The surface heating power of the FBR-28 is controlled within 1.5–2.5 W/cm² according to the power range, the working pressure is 0.6 MPa, and it is suitable for heating media such as mineral oil and water.
Focus on checking the function and settings of the temperature regulator, and confirm whether the temperature sensing probe is reasonably positioned and whether it is loose. If the regulator output is continuously on, replace the regulator or repair the control circuit. At the same time, confirm that the selected heater power matches the actual heat load to avoid continuous full-power heating under low-load conditions.
After disconnecting the power supply, check whether there are metal chips, oil stains, or other debris in the wiring device, and clean and dry it. Use a megohmmeter to measure the resistance from the heating element lead to ground. If the insulation has decreased due to moisture, low-temperature drying can be used. Check whether the cable sheath is damaged or crushed, and replace the cable if necessary. Seals in the explosion-proof cavity should be replaced promptly if aged to maintain the protection rating.
Cut off the power supply, depressurize the heater, and confirm that there is no internal pressure. Remove the fixing bolts of the heating element group, loosen the nuts, and pull out the old element. Install the new element in the reverse order, paying attention to aligning the sealing gasket and applying even tightening torque. After replacement, measure the insulation first, then energize for trial operation.
