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
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