Page 10
Measurement Troubleshooting (cont)
Symptom
Probable Cause
Corrective Action
Expected Result
Noisy reading
during gas
calibration
Calibrating gas flow
restricted generating
pressure pulses
Make sure calibration gas
flows freely
Stabilized reading
Noisy readings
during
measurement
Improperly mounted
protection cap or
membrane on CO
2
or O
2
sensor
Turn off purge gas and check
membrane and protection
cap mounting procedure.
Restart purge
Stabilized reading
Leaking solenoid valve in
CO
2
sensor
Check purge outlet. No gas
bubble should evolve during
the measurement ramp
If solenoid leaks (more than 1
bubble in 15 seconds), return
sensor to Orbisphere
Grounding mismatch
between Orbisphere
instrument and electronic
accessories (plotter,
terminal)
Plug all accessories and
instrument into same mains
terminal
Stabilized reading
Calibration out of
bounds
Wrong membrane model;
pierced/torn membrane;
or two membranes
superimposed
Replace membrane
Calibration constant should be
±50% of default value
Wet protection cap
Blow grill with compressed air
and let dry, carefully, in dry
gas flow for one hour
Wrong calibration values
entered against actual
calibration fluid or
pressure
Check that gas concentration
or pressure fit the entered
numerical data and units
Содержание ORBISPHERE 3624
Страница 1: ...Operator Quick Guide ORBISPHERE 3624 Revision F 03 10 2008...
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