Teledyne GFC-7001T - Trace CO Analyzer - Manual (Page 69)

Getting StartedTeledyne API – Model T300/T300M CO Analyzer
Teledyne Analytical Instruments 69
Figure 3-26: Pneumatic Connections – Option 50H: Zero/Span Calibration Valves
S AMPLE G AS S OURCE
Attach a sample inlet line to the sample inlet port. The SAMPLE input line should not
be more than 2 meters long.
 Maximum pressure of any gas at the sample inlet should not exceed 1.5 in-Hg above
ambient pressure and ideally should equal ambient atmospheric pressure.
 In applications where the sample gas is received from a pressurized manifold, a vent
must be placed on the sample gas before it enters the analyzer.
C ALIBRATION G AS S OURCES
SPAN GAS
 Attach a gas line from the source of calibration gas (e.g. a TAI’s T700E Dynamic
Dilution Calibrator) to the SPAN inlet.
Z ERO AIR
 Zero air is supplied internally via a zero air scrubber that draws ambient air through
the IZS inlet.
I NLET P RESSURE R ATING /C ONSIDERATION
This instrument has no significant internal restriction other than the flow control device
and pressure sensor shown in Figure 3-20. Sample must be introduced to the inlet fitting
at a fraction of a PSI above ambient pressure, just enough to drive the flow to the proper
value range.
If a pressurized source is used, both the zero air supply and sample gas line MUST be
vented in order to ensure that the gases input do not exceed the maximum inlet pressure
of the analyzer as well as to prevent back diffusion and pressure effects. These vents
should be: