Basic Operating Procedure - GE XMTC User Manual

B.2.2 Equipment (cont.)
The sample system consists of inlet needle valves for sample, zero, span, and reference gases; a 4-port explosion-proof
XMTC; two pressure gauges; and two flowmeters. All components are mounted on a painted steel plate. A pump may
be needed to draw a sample through the sample system.
Note: A TMO2D or XDP display package is typically used. A GE moisture analyzer display package can be used
when the H measurement is to be made in conjunction with a moisture measurement.
2
B.2.3 Basic Operating Procedure
The H purity is continuously monitored at the generator. A sample gas flow of 0.5 SCFH (250 cc/min) is established.
2
A hydrogen reference gas flow of 0.4 SCFH (200 cc/min) is sufficient for proper operation. The sample system should
be located in an area cooler than 50
(1.5 m) long to insure proper cooling of the sample gas.
For this application the required calibration gases are as follows:
•
Zero gas - 80.0% H
•
Span gas - H (minimum 99.95 % purity)
2
•
Reference gas - same as span gas
A typical XMTC Calibration Data Sheet is shown in Figure 59 below.
XMTC User's Manual
o o
C (122 F), and the tubing leading to the sample system should be at least 5 ft
in N
2 2
XMTC CALIBRATION SHEET
THERMAL CONDUCTIVITY TRANSMITTER
XMTC Transmitter
Serial Number
Part Number
Range, %
Output
PC Board
Work Order:
Calibration Date:
*Calibration is with Hydrogen (H
Figure 59: Typical XMTC Calibration Data Sheet
TC-135
XMTC-42-1
80 to 100% H in N
2 2
4 to 20 mA
703-1095
PCI 94445
September 1, 2000
Point %H * H
2
1 80.00
2 90.00 11.62
3 100.00 20.00
) in Nitrogen (N
2
Appendix B. Typical Applications
, mA
2
4.00
)
2
65