Great Plains Industries FM-300H Manuale d'uso - Pagina 12
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3. Remove the battery and, if neces-
sary, clean corrosion from the bat-
tery terminals. (Figure 11) To prevent
corrosion from condensation, coat
the terminals with petroleum jelly.
TROUBLESHOOTING
SYMPTOM
A. METER IS NOT
ACCURATE
B. READOUT
FADED OR
BLANK
12
Figure 11
PROBABLE CAUSE
1. Field Calibration not
performed properly
2. Factory Calibration not
suitable for liquid being
measured
3. Meter operated below
minimum flowrate
4. Meter partially clogged
with dried liquid
®
5. Teflon
tape or other
material in flow path
6. Nutator misaligned
1. Batteries weak, dead
or not connected
2. Battery terminal
corroded
3. Computer defective
4. Install the new battery.
When the battery is installed cor-
rectly, the computer powers on au-
tomatically. Check the readout to
make sure normal meter functions
have resumed before assembling
again. If necessary, seat the battery
again.
5. Make sure the coverplate gasket is
in good condition and properly seat-
ed. Replace, if needed.
6. Replace the battery cover. Torque
the screws to 9 to 10 in. lbs.
End of Season
To ensure proper operation, the meter
should be cleaned prior to extended
periods of inactivity and at the end of the
season before storage. Disconnect the
battery before storage.
CORRECTIVE ACTION
Field calibrate again or select Factory
Calibration.
Perform a Field Calibration according
to Calibration Section.
Increase flowrate. See Specifications
Section.
Remove meter. Disassemble and care-
fully clean dried chemical from the
nutator. Make sure the nutating disc
moves freely. Assemble again.
Remove meter. Clear material from flow
path and seal fittings. Install again.
Disassemble meter and install nutator
again. Ensure O-ring and retainer clips
are in place.
Replace battery. Install again, making
sure the gasket seats evenly around
the coverplate.
Clean corrosion from the terminals.
Contact the factory.