Watlow Immersion Heater

Electrical connection: The electrical connection must comply with the national electrical specifications, and the specifications of the power cord should be selected according to the power and voltage of the heater to ensure sufficient current carrying capacity, while also taking waterproof and dustproof measures. The installation of terminal boxes should avoid direct exposure to rainwater or corrosive liquids. If installed outdoors or in humid environments, additional protective measures should be taken.

（2） Maintenance points

Regular cleaning: Disassemble the heater regularly (e.g. every 3 months), clean the surface of the components of dirt, sediment, and other impurities to prevent affecting heat transfer efficiency. When cleaning, a soft bristled brush or specialized cleaning agent can be used to avoid scratching the protective cover of the component with sharp tools, which can lead to increased corrosion.

Status check: Check whether the protective sheath of the component is corroded, deformed, leaking, etc. If the sheath is found to be damaged, the component should be replaced in a timely manner to prevent the medium from infiltrating the interior and damaging the electrical components. At the same time, check the sealing performance of the terminal box to ensure that no moisture or dust enters, whether the electrical connections are tight, and whether there are any looseness or oxidation phenomena.

Calibration of temperature monitoring equipment: Regularly (e.g. every 6 months) calibrate temperature monitoring and control equipment such as thermostats and thermocouples to ensure the accuracy of temperature measurement and control. If the accuracy deviation of the equipment exceeds the allowable range, it should be adjusted or replaced in a timely manner.

Maintenance records: Establish a maintenance record file to record the maintenance time, content, problems discovered, and solutions taken for each maintenance, in order to track the usage status of the heater, predict possible failures in advance, and develop a reasonable maintenance plan.

Safety precautions

Prevent dry burning: Before running the heater, it is necessary to ensure that the medium has reached the specified liquid level and that the components are completely immersed in the medium. It is strictly prohibited to start the heater without medium or with insufficient medium liquid level to avoid dry burning causing component damage or even fire. Low level sensor can be installed to achieve low level protection. When the liquid level is lower than the set value, the heater power supply will be automatically cut off.

Explosion proof safety: In environments with explosive gases or dust, explosion-proof terminal boxes must be selected, and the installation of heaters must comply with explosion-proof regulations to avoid electrical sparks causing explosions. Regularly inspect the explosion-proof sealing surface. If damage or aging is found on the sealing surface, the sealing components should be replaced in a timely manner to maintain the explosion-proof performance.

Temperature control: It is strictly prohibited to operate beyond the maximum working temperature of the heater. Based on the characteristics and process requirements of the heated medium, the temperature control of the thermostat should be set reasonably to avoid overheating, decomposition or deterioration of the medium. For heat sensitive media, an over temperature protection device should be equipped to further improve safety.

Electrical safety: The grounding of the heater must be reliable to prevent leakage accidents. When conducting maintenance or overhaul, it is necessary to first cut off the power supply and hang a "Do Not Close" sign to avoid accidental power on and personal injury.