MODEL 1000 SEP 2005
INSTALLATION AND SETUP
3-13
3.1.6 Sample Systems Requirements
1
Observe Precautions and Warnings
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2
Plan Site Location
3
Obtain Supplies and Tools
4
Install Analyzer Wiring
Observe the following guidelines for installing GC sample systems:
Sample Line Length: If possible, avoid long sample lines. In case of a long sample line, flow
velocity can be increased by decreasing downstream pressure and using by-pass flow via a
speed loop.
Sample Line Tubing Material:
- Use stainless steel tubing for noncorrosive streams.
- Ensure tubing is clean and free of grease.
Dryers and Filters in Sample Line:
- Use small sizes to minimize time lag and prevent back diffusion.
- Install a minimum of one filter to remove solid particles. Most applications require
fine-element filters upstream of the Analyzer.
- Do use ceramic or porous metallic type filters. Do not use cork or felt filters.
Pressure Regulators and Flow Controllers in Sample Line: Do not use types containing cork or
felt filters, or absorbent diaphragms.
Pipe Threads, Dressing: Do use Teflon tape. Do not use pipe thread compounds (dope).
Valving:
- Install a block valve downstream of sample takeoff point for maintenance and
shutdown.
- Block valve should be gate valve or cock valve type, of proper material and packing,
and rated for process line pressure.
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