Hach Ultra ORBISPHERE 3625, Руководство оператора

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80 of 90 Troubleshooting - 3625 Package Analyzer
Operator Manual
ORBISPHERE
9.4 Troubleshooting Guide
The following table lists possible problems, causes, and proposed solutions.
Symptom Possible cause Correction Sensor
Instrument
does not start.
No display or
backlight.
No power.
Incorrect voltage.
Check connections.
Check instrument voltage label on the
instrument rear panel.
-
Blown fuse. Unplug the instrument and replace the fuse. -
Downward
drift during
measurement.
Purge gas pressure
too low.
Adjust pressure at regulator to get over 3
bubbles per second from sensor exit tube
(immerged in water).
CO
2
Sample flow
stopped.
Correct and start a new test.
CO
2
Low reading.
Leak in purge gas. Check line for leaks with soapy water.
CO
2
Sample flow too low. Adjust sample flow according to procedure.
O
2
High reading.
Incorrect calibration
in gas (wet
membrane &
protection grille ?) Recalibrate the sensor according to
procedure.
O
2
CO
2
High/low
readings.
Calibration values
entered did not
match sample used.
Check that the entered numerical data and
units fit the gas concentration or pressure.
O
2
CO
2
Unstable
reading
during
calibration.
Calibration gas flow
restricted,
generating pressure
pulse.
Make sure calibration gas flows freely;
unscrew sensor collar ¼ turn to create a leak,
thus increasing gas flow during calibration.
CO
2
Calibration
impossible
Improperly mounted
protection cap or
membrane.
Sensor needs servicing.
O
2
CO
2
Leaking purge gas
solenoid valve in TC
sensor.
Check purge gas sequence. If purge gas
solenoid leaks during measurement phase
(more than 1 bubble in 15 seconds), the
sensor needs servicing.
CO
2
Erratic read-
ings.
Water condensation
into the thermal con-
ductivity element.
In Options menu, turn on Continuous Purge
mode overnight to dry the sensor cell.
Note:
Water condensation may seriously
damage the TC sensor cell.
CO
2
Forcing gas
pressure P3
≈
P4 during
measurement
cycle.
Product in manifold
electro valves.
Perform cleaning and testing of the manifold
valves.
-