
3 Installation
3.4Gas Line Connections
All of the gas lines to the system hook up at the back of the unit (see Figure
CAUTION: Do not put any torque on the tubes welded on the sampling system.
Check that each of the lines is hooked up to the correct connection. The lines should be connected in the following order (from left to right):
3.4.1. Span Gas In
Provide at least one sample gas of a known oxygen concentration. Using
3.4.2. Instrument Air (Compressed Air Fitting)
The gas pressure
CAUTION: Pressure higher than 80 psig can damage the solenoid valves.
3.4.3. Sample Gas In
Hook up the sample gas to the sample gas inlet. When the sample gas flows through the optional oxygen scrubber, the sample gas becomes the zero gas and can be used for calibration.
Note: Sample and span gas pressure should be between 5 and 10 psig and within ±2 psi of each other. A substantial difference in the span and sample gas pressures will cause a sudden change in gas flow rate.
3.4.4. Vent
The vent transports the sample or span gas out of the system after exposure to the
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