General Troubleshooting - Ametek Dycor CG1100 Series 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.
The 24-Volt DC-to-DC converter
can be easily checked to ensure if it is
working properly by disconnecting
the power from the 24-Volt board to
the analog board and attaching the
power connector directly from the
analyzer to the analog board.
6-6 | Dycor CG1100 Oxygen Analyzer
Leak Check
Sniff the fittings with 100% oxygen 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
problems 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 Psi) and apply a low PPM
calibration gas to the inlet of the analyzer. This pulls the low
calibration gas into the sensing portion of the analyzer.
Allow the gas to stabilize and then measure the cell mil-
livolts. using a voltmeter, measure across cell + (TB4, Pin
1) to cell- (TB4, Pin 2) on the analog board. Remove the top
cover and spray 100% oxygen over the sample inlet plumb-
ing. if the cell millivolts decrease, it indicates a leak.
Do not spray gas on the reference side of the cell.
24-Volt Converter
Remove the power connector from TB3 on the analog
board.
Remove the power connector from the bottom of the 24-Volt
converter board and plug it into the TB3 connector on the
analog board.
Power is now connected directly from the analyzer. if the
analyzer operates using this connection, then the 24-Volt
converter board must be replaced.