In the course of the use of the user encountered the following symptoms, according to the electrical contact water level meter manufacturers to provide the method of troubleshooting, electrical contact water level meter can not easily return to the factory to eliminate the failure.
There is no indication of the electrical contact water level gauge
After turning on the meter power, the panel LED light does not light, should check the internal working voltage of the instrument is normal (± 12V), the specific method for checking the fuse on the instrument is intact, the transformer is broken and other symptoms.
After power on red, there is little or no light
Check the electrical contact water level meter fault point corresponding to the comparator (LM324) operating voltage is normal, the corresponding crystal transistor is intact, whether Weld or broken.
After the media is immersed in the electrical contact, the corresponding display is not green
(Or add 19 100KΩ or less resistance), if the meter is not green, should check the transmitter AC 15V is normal, the table The internal potentiometer is intact, the comparator negative reference voltage is normal.
Measurement of the liquid level has reached the alarm position, the instrument is not alarm
Check the electrical contact water level alarm part of the alarm point corresponding to the crystal transistor is intact, whether the relay is damaged, with or without solder welding phenomenon.
Measuring the liquid level has been to the alarm position, the instrument alarm normal and the front of the light-emitting diode does not flash
Check the electrical contact water level meter circuit is working properly. Specific use of oscilloscope can check the time base circuit (NE555) of the three feet, should be a regular frequency pulse signal generation, while checking the corresponding transistor transistor is not intact.
Such as the above are normal after the electrical contact water level gauge can not work properly, can be directly back to the electrical contact water level gauge manufacturers for repair.
