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3-4
3 Installation3 Installation
3 Installation3 Installation
3 Installation
TELEDYNE ANALYTICAL INSTRUMENTS
3.4 Gas Line Connections
All of the gas lines to the system hook up at the back of the unit (see Figure 3–1).
All of the fittings on the removable back panel are ¼ " male VCR type fittings, with the
exception of the compressed air inlet fitting. Use the wrenches provided to connect the
gas lines. Insert the gasket between the fitting and tighten the female and male nuts
until finger-tight; then, by holding the male nut with the wrench, tighten the female nut
with the second wrench by ¼ turn.
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
70-99 % of the range just one range above the range of interest is recommended. Any
range EXCEPT 0-1 ppm may be used to calibrate.
3.4.2. Instrument Air (Compressed Air Fitting)
The gas pressure (70–80 psi) needed to operate the pneumatic valves in the
analyzer can be supplied through this fitting.
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 Micro-Fuel Cell sensor.