Oxymitter 5000
8-22
Instruction Manual
IM-106-350, Rev 2.2
July 2008
HEATER NOT OPEN,
BUT UNABLE TO REACH
736°C SETPOINT
The temerature setpoint of 736°C can not be reached because the Oxymitter
5000 has an "autotune" function for establishing heater control parameters.
Probes mounted into processes that operate at above 600°C may have a
hard time controlling the temperature with the "autotune" function enabled.
To disable the autotune function, conduct the following procedure with the
LOI.
1. Select System.
2. Select Parameters.
3. Select Auto Tune?
4. Select No to disable the Auto Tune function.
CALIBRATION PASSES
BUT STILL READS
INCORRECTLY
There are a few fault conditions where no alarm indication is present and the
probe passes calibration but the O
2
reading may still be incorrect.
Probe passes calibration, but still appears to read high
There may be a leak that is permitting ambient air to mix with the process
gases. Since many combustion processes are slightly negative in pressure,
ambient air can be sucked into the cell area, biasing the O
2
reading upward.
1. Make sure that the calibration gas line is capped tightly between
calibrations. If autocal is used make sure the check valve is seating
properly.
2. If an abrasive shield is installed to protect the entire probe from
particulate erosion, a leak in the probe flange gasket can allow ambient
air to migrate down the annular space between the probe and shield,
and then into the cell. Always install a new probe flange gasket when
reinstalling a probe.
There may be a leak inside the probe itself, permitting the reference air
(20.95% O
2
) to mix with the process gases at the cell. To confirm this leak
condition instrument air will need to be connected for reference. Pressurize
the inside (reference side) of the probe by plugging the reference air exhaust
port with your finger for 1 minute. The O
2
reading should decrease slightly. If
the O
2
reading increases during this test there is a leak inside the probe.
1. Acid condensation inside the probe can degrade the red silicon tube
(32, Figure 9-3) that carries the cal gas to the cell. Remove housing (25)
to inspect this hose. (See Section 9: Maintenance and Service). Black
Viton™ material is optionally available with greater chemical resistance.
Figure 8-18. Probe Leakage
Paths
BOTTOM VIEW
38730098
PROBE HEAD
Corrugated
Seal
Reference Air
Exhaust Port
Probe
Flange
Gasket
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