- III. Maintenance points1. Daily maintenance (weekly)• Clean the surface: wipe the dust on the outer shell with a dry soft cloth, and do not rinse with water; clean the air inlet filter (detachable) to prevent dust accumulation from affecting the air volume (the air pressure indicator will go out when the filter is blocked).
• Electrical inspection: Check whether the terminal is loose or hot (if the terminal changes color, tighten or replace it in time), and measure the insulation resistance of the heating tube (≥2MΩ, use 500V megohmmeter).
2. Regular inspection (every 500 hours or half a year)
• Heating element: Disassemble the air duct to check whether the surface of the heating tube is scaled (such as the surface of the electric heating tube is burnt black), which can be lightly removed with fine sandpaper. If it is serious, it needs to be replaced (the life of the heating tube is usually 3000~5000 hours).
• Fan maintenance: Add high temperature resistant grease (model: lithium grease No. 1, temperature resistance ≥120℃) to the bearing, and test the fan speed (measured with a tachometer, the deviation should not exceed ±10% of the rated value).
• Temperature control system: calibrate the temperature sensor (compared with the standard thermometer, if the error exceeds ±2℃, it needs to be replaced), and check whether the PLC program parameters are offset.
3. Maintenance in special scenarios
• Corrosive environment: If used in spraying and chemical workshops, it is necessary to check whether the anti-corrosion coating (such as Teflon coating) on the surface of the heating tube is peeling off every month, and the inner wall of the air duct needs to be sprayed with anti-corrosion paint (acid and alkali resistant).
• High dust environment: Increase the frequency of filter cleaning (once every 3 days), and install a cyclone dust collector if necessary to prevent dust accumulation from causing short circuits.
IV. Safety protection measures
1. Overload and over-temperature protection
• Double protection devices must be installed:
◦ Thermostat over-temperature alarm: The set value is usually the target temperature + 10~15℃ (such as the target is 80℃, the alarm value is set to 95℃), and the heating power is automatically cut off when triggered.
◦ Thermal fuse: Installed near the heating element (temperature resistance 180~220℃). When the thermostat fails, the fuse will blow and cut off the circuit (cannot be reset, need to be replaced manually).
2. Explosion-proof and fire-proof requirements
• If used in flammable and explosive places (such as paint drying), explosion-proof heaters (compliant with Ex d IIB T4 explosion-proof level) must be selected, the heating tube must be wrapped with a stainless steel explosion-proof net, and the air duct interface must be flameproof.
• Fire extinguishers (dry powder or CO₂ fire extinguishers) must be configured nearby, and welding, cutting and other hot work are prohibited when the equipment is running.
3. Operator training
• New employees must receive training and be familiar with the "Emergency Stop Process" in the equipment manual (such as pressing the emergency stop button → cutting off the power → turning on ventilation).
• Non-professionals are prohibited from disassembling the thermostat and changing the circuit parameters to avoid equipment failure due to setting errors.
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Post time: Aug-11-2025
