6-10 | Thermox Series 2000 WDG-IV / IVC / IVCM
Process Pressure Checks
To check that you entered the process pressure correctly, select Process Pressure from the
Setup key. Also ensure that the calibration process pressure equals normal operating process
pressure. Calibration should only be performed under these conditions for highest accuracy.
Cell Checks
If the cell fails when you rst begin
to use the analyzer:
It is likely that there is a leak in the sensor plumbing
or an improper calibration gas setup, and there is not
a problem with the cell itself (see the “Leak Check”
section later in this chapter for help on how to check
for leaks; see the “Calibration/Aspirator Air Checks”
section earlier in this chapter for help on checking
your calibration gas setup).
If the analyzer has been operating
for some time and you feel the oxy-
gen reading is inaccurate:
First check by running a known calibration gas to veri-
fy the analyzer’s response. If the analyzer responds to
the calibration gas correctly, it indicates either leaking
or plugged plumbing.
If your analyzer doesn’t respond
properly to the calibration gas:
This may indicate a problem with the cell. Before
replacing the cell, put the analyzer through a primary
calibration and see if this improves the response of
the analyzer. If this doesn’t work, check for leaks or
plugged plumbing.
If this doesn’t solve the problem, replace the cell, then run another primary calibration.
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