Oil bath pot 6 major troubleshooting and troubleshooting
1, the whole power supply abnormality maintenance mode:
Check if the power socket has power, whether the fuse is intact, and whether the power switch has fault. This fault is mostly caused by the power switch. The power indicator light is on, but the temperature controller has no screen display. Check whether the temperature controller output is normal. Generally, such a fault is caused by a transformer on the temperature controller or a virtual soldering phenomenon during use.
2 , the meter is set, the display is normal but not heated:
First, judge from the screen display, first turn on the power, adjust the set temperature to more than 20 °C above the design temperature, and then observe whether the heating indicator is on. If it is bright, it indicates that the heating tube is broken or the relay contact is in use for a long time. The middle contact is ablated, causing it to be unable to be connected, so it cannot be heated, it needs to be replaced, and it can also be checked by a multimeter. The inspection method is to turn off the power supply, and use a multimeter resistance file (10 ohms) to determine whether the resistance is small (oil bath heating tube) The resistance is generally <100 ohms. If the resistance is large, the heating tube must be broken, the resistance is normal, and the relay is mostly damaged.
3, instrument settings, display are normal, but the heating is continued when the temperature reaches the set temperature:
For the first use of the oil bath pot due to the use of microcomputer PID control method, there will be over-temperature phenomenon, but the over-temperature generally does not exceed 10 ° C, the first use needs to be self-tuning after the effect is better, observe whether the heating indicator is reaching the setting After the temperature is extinguished, if it is off, the temperature controller is normal, just replace the relay. If the heating indicator is always on, the temperature controller is broken and needs to be replaced.
4 , after using the oil bath for a period of time, the temperature is not added:
Most of the heating tube resistance is increased or the connection line with the heating pipe is corroded, resulting in a large contact resistance. The former needs to replace the heating tube, the latter cuts the wire at the joint, and cleans the rust part of the heating pipe joint. The two methods of judging can be done by visual inspection.
5, set temperature, decreased temperature display, the actual temperature in the heated state:
K sensor is applicable, PT100 sensor will not have this phenomenon, this phenomenon occurs in the replacement of new sensors, just need to change the positive and negative sensors. If the meter screen displays 000 or 999, etc., the sensor is open or shorted and can be replaced.
6, super-heated oil bath pan does not circulate Troubleshooting:
The super constant temperature oil bath has a circulation function. If it is found that the circulation pump does not turn, this phenomenon is mostly no capacity of the capacitor, and it can be replaced. (Judgement method: turn on the power switch, turn on the circulating pump power supply, turn the motor shaft by hand, If it turns, it means the capacitor is bad. If it does not turn, the motor is faulty.
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