User guide

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4.3 TROUBLE SHOOTING
TABLE I. TROUBLE SHOOTING GUIDE
OBSERVATION PROBABLE CAUSE REMEDY
Flow trip level continually drifting
downward with constant flow.
Coating forming on wetted surface
of transducer.
1. Clean transducer periodically.
2. Adjust trip potentiometer
clockwise until layer build-up
stabilizes.
After switch has been operating properly:
Relay trips with flow above trip level and
cannot be adjusted using SECTION 3.3
instructions. Relay does not trip when
flow falls below trip level and cannot be
adjusted using SECTION 3.3 instructions.
Bad electronic component. Contact factory.
Relay cannot be made to trip by adjusting
"Trip" potentiometer.
1. Initial flow rate estimate was
too low or too high.
2. Flow media change.
1. Check flow conditions.
2. Contact factory.
LED is not lit and relay stays in alarm
condition (N.C. contact is made).
1. No power to electronics.
2. Blown fuse.
1. Check incoming power.
2. Replace fuse with ½ Amp fast
acting fuse (fuse is in PCB
socket).
3. Contact factory.
!! CAUTION: The electronics are not protected against condensed liquid water inside the
enclosure. If conduit is used, be sure conduit is dry or sealed at the instrument to prevent conduit
condensation from entering the enclosure.