Replace Carrier Cylinder; Calibration Gas For Btu Analysis - Emerson Rosemount 700XA Reference Manual

Reference Manual
2-3-9000-744
B.3

Replace carrier cylinder

To replace one carrier cylinder without interrupting gas chromatograph (GC) operation:
Procedure
1. Turn cylinder valve off.
2. Back off on cylinder pressure regulator until handle turns freely.
3. Remove cylinder.
4. Attach new cylinder to regulator.
5. Open cylinder valve for Carrier Cylinder 1.
6. Open the shut-off valve attached to the carrier regulator.
7. Regulate pressure out of the cylinder to 20 psig (1.4 BarG); then close the cylinder
8. Repeat
9. Open V-1 (bleed valve) and let the carrier gas bleed to atmosphere until both
10. Repeat
11. Leak-check the fitting.
12. Open the appropriate block valve to the analyzer (V-2 or V-3) and regulate outlet
B.4

Calibration gas for BTU analysis

The calibration gas used for BTU analysis should be blended of gases specified as primary
standards. Primary standard gases are blended using weights that are traceable to the
National Institute of Standards and Technology (NIST). For other applications, blend the
calibration gas to the specifications detailed in the analyzer's Application Data Sheets.
The calibration gas should not have any component that could drop out at the coldest
temperature to which the gas will be subjected. A typical blend for a temperature of 0 °F
(-17.7 °C) is listed in the following table. No dropout will occur in this calibration gas if it is
blended at a pressure below 250 psig (1723.7 kPa).
Gas
Nitrogen
Carbon Dioxide
Methane
Propane
Isobutane
N-butane
Neopentane
Rosemount 700XA
The pressure indicator will read the cylinder pressure.
valve.
Step 6 and Step 7
gauges read 0 psig (0 BarG); then close V-1.
pressure to appropriate level.
See Step 14 and Step 15
Mole Percent
2.5
0.5
Balance
1.0
0.3
0.3
0.1
Carrier gas installation and maintenance
twice to purge the line to V-2.
of Install manifold and purge
June 2022
line.
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