General Troubleshooting - Ametek Dycor CG1000-RTP User Manual

General Troubleshooting

General Troubleshooting
Your system may pass calibrations
yet still seem to be reading incorrect
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 | Dycor CG1000-RTP 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 any prob-
lems that might occur with plastic melting the nozzle on hot
sensor components.
Connect a vacuum pump to the outlet of the analyzer
(vacuum should not exceed 5 psig) and apply a low PPM
calibration gas to the inlet of the analyzer. This pulls the low
calibration gas into the sensor.
Allow the gas to stabilize and then measure the cell mil-
livolts. Remove the top cover and spray 100% oxygen over
the sample inlet plumbing. If the cell millivolt decreases,
it indicates a leak in the plumbing. If you cannot view the
analyzer display, use a volt meter on Cell + and Cell - con-
nections 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.