AMI Analyzer Manual
Installation Procedure
10
any liquids from getting to the analyzer. Any liquids fall back into the pipeline, thus minimizing maintenance
issues. Also, the Liquid Rejection Probe acts to prevent the problems that arise when the source of the gas
is shut off while the downstream compressor continues to run, thus pulling a vacuum on the line. Normally
this would cause air to be drawn into the line through the analyzer vent, but the Liquid Rejection Probe
contains a very sensitive check valve that prevents this.
5. Connect the sample line with ¼” stainless steel tubing.
Use stainless tubing only to connect the sample to the analyzer. Other materials are normally not robust
enough. Normally ¼” tubing is adequate unless the sample run is very long and the source pressure low – in
this case you may have to use wider tubing.
You should have some kind of blocking valve on the sample port. If you use a Demister, use at least a half
inch ball valve at its base.
6. Turn the Sample/Span/Off valve to the Off position.
The Sample/Span/Off valve is to the lower right of the grey faceplate above. This valve contains a metering
valve in its center. If you turn the Sample/Span/Off valve to the off position, it will stop either sample or
span gas from flowing into the analyzer – but the exhaust is still connected to the atmosphere so when you
have a sensor in the analyzer it is not sealed off by this valve. At this point in this procedure you shouldn’t
have the sensor in place yet. Don’t use the metering valve to shut off the flow (as it is a fine adjustment
valve)!
7. Pressurize the sample line to line pressure (1 – 150psig).
The exact pressure doesn’t matter – we want enough so that you can easily see leaks in the following step.
8. Leak check every fitting and weld from the analyzer inlet to the sample tap.
Use a liquid soap solution such as “Snoop™” or similar. Don’t spray it on! You are looking for little bubbles
that appear after a while, indicating a leak. Even the tiniest leak will allow oxygen to enter the gas stream,
no matter what the pressure inside the line is. Check absolutely every possible source including welds, valve
packing, fittings both around the tube and the nut, and anything else that might leak.
9. Connect the vent line to outside, running slightly downhill all the way.
Particularly if the analyzer and gas is warmer than the environment, any water vapor in the gas will tend to
condense in the vent line. If the line runs uphill, or has a low point, water will collect and potentially freeze,
stopping the flow. If the sample gas is flammable, the vent must go to a safe area.
Also take precautions that insects don’t make nests in the exhaust line. You may need some sort of a grill
over it.
10. Adjust the sample flow to approximately 1 SCFH with the Flow control valve located in the middle
of the Sample/Span/Off valve.
The Flow Control Valve is the metering valve in the middle of the Sample/Span/Off valve. It is a sensitive
needle valve – so don’t try to use it to shut off the flow. Turn the main valve to the OFF position for this.
Содержание 210BR
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Страница 24: ...AMI Analyzer Manual Analyzer Description 21 Drawings Figure 7 Outline Drawing Figure 8 Flow schematic ...
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