WARNING
Failure to observe precautionary signs may result in serious injury or death to personnel.
Observe all precautionary signs posted on the certified explosion-proof equipment.
Consult your company's polices and procedures and other applicable documents to
determine wiring and installation practices that are appropriate for hazardous areas.
4.3.4
Sample system requirements
Line length
If possible, avoid long sample lines. In long flow sample lines, velocity
can be increased by decreasing downstream pressure and using
bypass flow via a fast loop.
NOTICE
Stream switching requires a sample pressure of 20 psig (1.38 barg).
Sample line tubing material
•
Use sulfur-inert tubing for H
2
S streams; for all other applications,
use stainless steel tubing.
•
Ensure tubing is clean and free of grease.
Dryers and filters
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 gas
chromatograph (GC). The GC includes a 2-micron filter.
•
Use ceramic or porous metallic type filters. Do not use cork or felt
filters.
NOTICE
Install the probe/regulator first, immediately followed by the
coalescing filter and then the membrane filter.
Pressure regulators and
flow controllers
•
Use stainless steel wetted materials.
•
Parts should be rated for sample pressure and temperature.
Pipe threads and dressings
Use PTFE tape. Do not use pipe thread compounds or pipe dope.
Valving
•
Install a block valve downstream of sample takeoff point for
maintenance and shutdown.
•
The block valve should be a needle valve or cock valve type, of
proper material and packing, and rated for process line pressure.
Installation and start-up
Reference Manual
June 2022
2-3-9000-744
54
Emerson.com/Rosemount
Summary of Contents for Rosemount 700XA
Page 1: ...Reference Manual 2 3 9000 744 Rev L June 2022 Rosemount 700XA Gas Chromatograph ...
Page 6: ...TxD TD or Sout Transmit data or signal out 6 ...
Page 30: ...Overview Reference Manual June 2022 2 3 9000 744 30 Emerson com Rosemount ...
Page 100: ...Installation and start up Reference Manual June 2022 2 3 9000 744 100 Emerson com Rosemount ...
Page 182: ...Operation and maintenance Reference Manual June 2022 2 3 9000 744 182 Emerson com Rosemount ...
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