Install Manifold And Purge Line - Emerson Rosemount 700XA Reference Manual

Carrier gas installation and maintenance
June 2022
Valve
V-1
V-2
V-3
V-4
B.2

Install manifold and purge line

To install and purge the dual-bottle carrier gas manifold, proceed as follows:
Procedure
1. Install manifold as shown in
2. Back off pressure regulator (counter clockwise) fully.
3. Open cylinder valve for Carrier Cylinder 1.
4. Open the shut-off valve attached to the carrier regulator.
5. Regulate pressure out of the cylinder to 20 psig (137.9 kPa); then close the cylinder
6. Open V-1 (bleed valve) and let the carrier gas bleed to atmosphere until both
7. Repeat
8. Purge the line to V-3 by repeating
9. With valves 1-4 closed, open both cylinder valves and regulate both carriers to
10. Open V-2 and V-3 simultaneously; then turn both cylinder valves off and let the
11. Repeat
12. Close V-3; leave V-2 open.
13. Open the cylinder valve of Carrier Cylinder 1 and, with carrier gas flowing at 10 psig
14. Slowly regulate Carrier Cylinder 1 to 110 psig (6.9 to 758.4 kPa).
15. Open V-3 and slowly regulate Carrier Cylinder 2 to 100 psig (689.4 kPa).
16. Leak-check all of the fittings carefully.
17. Let the GC run overnight before calibrating.
264
Carrier gas cylinder
Carrier Cylinder 1
Carrier Cylinder 1
Carrier Cylinder 2
Carrier Cylinder 2
tubing to the gas chromatograph (GC), but do not connect.
The pressure indicator will read the cylinder pressure.
valve.
gauges read 0 psig; then close V-1.
Step 4 and Step 5
valve V-4 and Carrier Cylinder 2.
approximately 10 psig (68.9 kPa).
carrier gasses bleed through the line to the GC until all gauges read 0 psig.
Step 8 and Step 9
(68.9 kPa) or below, connect the carrier line to the GC.
By doing this, all but 100 pounds of Carrier Cylinder 1 will be used before any of
Carrier Cylinder 2 is used. When Carrier Cylinder 1 gets to 100 pounds, replace the
cylinder.
Valve description
Bleed valve
Block valve
Block valve
Bleed valve
Figure B-1. Close all valves and tighten all fittings. Run
twice to purge the line to V-2.
Step 2 through Step
twice to purge the line to the GC.
Reference Manual
2-3-9000-744
6; but this time, use bleed
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