Appendix B. Typical Applications
60 XMTC User’s Manual
B.1.2 Equipment (cont.)
The sample system consists of needle valves for selection and isolation of sample, zero, and span gases, a needle valve
for flow control, a filter/coalescer, a 2-port XMTC transmitter, a pressure gauge, a flowmeter, and a sample pump. All
components are mounted on a painted steel plate.
Note: A TMO2D or XDP display package is typically used. A GE moisture analyzer can be used when the H
2
measurement is to be made in conjunction with a moisture measurement.
B.1.3 Basic Operating Procedure
The H
2
content is continuously monitored at the inlet, hot zone, and/or effluent of the furnace. A sample gas flow rate
of 0.5 SCFH (250 cc/min) is established. The sample system should be located in an area cooler than 50
o
C (122
o
F), and
the tubing leading to the sample system should be at least 5 ft (1.5 m) long to insure proper cooling of the sample gas.
For this application the required calibration gases are:
• Zero gas - N
2
(99.95 % minimum purity)
• Span gas - 10.0 or 25.0% H
2
in N
2
, or H
2
(99.95 % minimum purity)
A typical XMTC Calibration Data Sheet is shown in Figure 57 below.
Figure 57: A Typical XMTC Calibration Data Sheet
XMTC CALIB RATIO N SHEET
THERMAL CONDUCTIVITY TRANSMITTER
Serial Number TC-102
Part Number XMTC-22-2
Range, % 0 to 25% H
2
Output 4 to 20 mA
PC Board 703-1095
Work Order: PCI 90403
Calibration Date: September 18, 2000
Point %H
2
* H
2
, mA
1 0.00 4.00
2 25.00 20.00
*Calibration is with Hydrogen (H
2
) in Nitrogen (N
2
)
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