3-7
Trace Oxygen Analyzer Installation 3
Teledyne Analytical Instruments
is keyed to fit only one way into the receptacle. Do not force it in. The other
end of the cable is made of four separate wires. These should be connected
to the terminal strip on the analysis unit as follows:
Red: #1
Black: #2
Green: #3}The green and white connectors can be
White: #4 interchanged, but be consistent.
Refer to the Final Assembly, Dwg. C-64641.
3.4 Gas Connections
Gas connection instructions depend on the specific External Probe used
and any special requirements of the process being monitored.
The standard Model 3190 External Probe has inlet and outlet fixtures
only. Calibration gasses must be tee'd into the sample inlet through appropri-
ate valves. ¼ inch tube fittings are used. For metric installations, ¼ inch to 6
mm adapters are supplied.
In general, sample flow and pressure must not create significant
backpressure past the sensor. For the standard probe, 2 scfh is the nominal
recommended flowrate.
The pressure required will depend on the sampling system. When
venting into a constant pressure, such as the atmosphere, controlling input
pressure is simple. If you are venting into a system of varying pressure, then
some form of pressure regulation is required.
3.5 Installation Checklist
Before connecting the instrument to the power source and turning it on,
make sure you have:
•Correctly installed the Sample and Exhaust gas lines
•Opened the isolation valves
•Checked for leaks
•Set the sample pressure to 5–10 psig, nominal
Once the above checks have been made, you can connect to the power
source. The instrument is now ready for operation.