GE XMTC, User Manual

Page: 76 / 126

Appendix B. Typical Applications
66 XMTC User’s Manual
B.2.4 How Previously Handled
The system (generator) was leak checked periodically. If a leak occurred between checks, an explosion could occur.
Moisture analyzers were also used for continuous analysis, since the presence of moisture in the H
2
is indirect evidence
of an air leak.
B.2.5 Permanent Installation
Continuous monitoring of the generator H
2
purity using the XMTC provides increased safety. A low H
2
reading alerts
plant personnel to a potential safety problem and allows them to locate the leak and correct the problem.
B.2.6 Specifications
Range:
80 to 100% H
2
in N
2
Operating Conditions:
Pressure: 0.5 to 75 psig
Temperature: +30° to +50
o
C (+86 to +122
o
F)
B.2.7 Detailed Operating Procedure
The following procedure details the start-up, operation, and calibration of the 4-port (Flowing Reference Gas) XMTC
sample system for the hydrogen purity applications shown in
Figure 58 on page 64 .
Needle valves N1 through N4 on the sample system drawing have the following functions:
•
N1 – controls the flow of the process sample gas
•
N2 – controls the flow of the zero calibration gas
•
N3 – controls the flow of the span calibration gas
•
N4 – controls the flow of the reference gas