Magnetic flap level remote transmission
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The magnetic flap level transmission drops suddenly, and then adjusting the zero point and range on-site has no effect. Is the circuit board broken?
“The “magnetic flap level gauge” belongs to the category of on-site instruments； ““Remote transmitters” and flap level gauges are not part of the same system. The instrumentation staff should be contacted to confirm the handling on-site.
Most magnetic flap level gauges with remote transmission are reed switch level gauges attached to the outside of the float. As the float inside the buoy moves up and down with changes in liquid level, the position of the magnet located within the float changes, which in turn alters the state of the magnetic switch in the reed switch (from open to closed). Only those reed switches that are within the range of influence of the magnet remain closed, while all others remain open, thereby changing the resistance value of the circuit. The lower the liquid level, the higher the resistance value; the higher it is, the lower the resistance (with the outlet at the top). Since the circuit operates with a constant current, it can be converted into signals such as 4–20 mA HART through current/voltage conversion. This type of remote magnetic flap level gauge has a high failure rate; we generally do not use reed switch-based remote transmission of this kind.
What are the common faults for this? For this kind of thing
If everything appears fine on-site, then there is a problem with the switching of the reed switch
We don’t use reed switches very often these days