Common faults and solutions of capacitive liquid level gauge

The principle of the capacitive liquid level gauge is that when the measured medium dips and the height of the measuring electrode changes, its capacitance changes. The change of the liquid level medium height is converted into a standard current signal, which is transmitted to the operation control room for centralized display, alarm or automatic control by secondary instruments or computer devices. During use, if the instrument has no current output, check whether the '+' and '- lead wires of the signal processor are loose or fall off, and whether the instrument indicates whether the fixed thread of the meter head and the fixed column are loose or not, and the contact is poor. If the above occurs The problem should be reinforced immediately. If the indicator of the instrument is zero, hold a metal tool by hand and touch the 'sensor' terminal of the signal processor, the indicator of the instrument should increase, otherwise it indicates that the instrument's signal processor is damaged. At this time, the instrument's signal processor should be checked. Replace. If the indicator is full, remove the signal processor 'sensor' lead. If the indicator light is still full, the signal processor is damaged. If the indicator returns to zero, the insulation of the sensor may be poor. When the insulation is not good The sensor should be replaced immediately. Check the sensor method: remove the sensor lead wire from the signal processor. Use a 500V shaker or a 500-type multimeter to measure the resistance between the sensor lead wire and the metal tower wall, which should be greater than 10M ohms, otherwise Indicates that the sensor is poorly insulated. Discrimination and elimination of interference: If the instrument works normally in the laboratory and the indication value fluctuates and indicates a certain liquid level value in the field, it can be judged that the instrument is disturbed except for the capacitive liquid level gauge. The stick-type liquid level gauge is a commonly used non-contact liquid level instrument. It does not need to open holes in the container to be measured, and the ultrasonic probe can be attached to the bottom of the storage tank to complete the measurement. The external stick-type level gauge adopts explosion-proof design and can be widely used. Applicable to various working conditions.
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