AMI Analyzer Manual
Expanded Installation Procedure
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23
Sample Handling:
Figure 6 Flow Schematic of the 201RSP.
This analyzer expects to see ambient inlet pressure. It contains an integral needle valve and flowmeter for
controlling and observing the sample flow. It also contains solenoid valves that seal off the sensor when
power fails, and also that can select between the sample and a span calibration gas.
The span gas should be at the same pressure as the sample – i.e. ambient pressure. See the diagram above
for how to accomplish this. The idea is that when you span the analyzer you flow some span gas out of the
bypass flow meter so that the inlet to the analyzer is at ambient pressure. If you don’t do this, the pump will
fight the span tank regulator and you may have a random pressure on the sensor, which will ruin the
calibration, and possibly the sensor as well. Make sure that you turn off the span gas cylinder valve when
you are not using it – otherwise you may lose all the span gas if you have a tiny leak in the system
somewhere.
