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General Troubleshooting
Your system may pass calibrations
yet still seem to be reading incor-
rect oxygen levels.
Leaks can lead to inaccurate read-
ings especially if operating under
a significant pressure or vacuum.
Check that all compression fitting
and pipe thread connections are
leak tight.
6-8 | Thermox CG1000 Oxygen Analyzer
Leak Check
Sniff the fittings with another gas using a piece of tygon or
plastic tubing with a 1/8" stainless steel nozzle to apply the
gas from a cylinder. Using stainless steel prevents problems
that might occur with plastic melting the nozzle on hot sensor
components.
Connect a vacuum pump to the outlet of the sensor (should
not exceed 5 psi) and apply a low PPM calibration gas to the
inlet of the sensor. This pulls the low calibration gas into the
sensor.
Allow the gas to stabilize and then measure the cell millivolts
from the front panel display. Remove the top cover and spray
100% oxygen over the sample inlet plumbing and if the cell
millivolt decrease, it indicates a leak in the plumbing. If you
cannot view the analyzer display, apply a volt meter the Cell
+ and Cell - connections on the backplane board to see if the
cell millivolts change, indicating a leak.
Do not spray gas on the reference side of the cell.
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