GE 000 gpd Operation And Maintenance Manual page 36

SYMPTOM
Electrical machine shut
down
(continued)
Conductivity drifts or
changes after calibration
Display is blank
pH reading is off by more
than 1pH unit
TROUBLESHOOTING
POSSIBLE CAUSES
Motor starter overloaded,
heater tripped.
Calibration may have been
done before the reading stabi-
lized
The stable line may contain
electrical noise
Turbine meter not spinning
Monitor not powered
Probe calibrated using span or
the pH probe is bad
31
REMEDIES
Turn the switch OFF; let the
heater(s) cool.
When calibrating, wait at
least 15 seconds to 1-1/2
minutes for reading to stabi-
lize.
To reduce electrical noise,
use grounded metal fittings
on the inlet and outlet of
the monitor plumbing.
Check meter for spin.
Open the front panel.
Look at the yellow LEDs
on the rear power board.
Are they ON? If yes, check
ribbon cable. Is it properly
seated? If no, does the unit
have power?
Re-initialize calibration.
Recalibrate using zero
only. Replace pH sensor.