XMTC User’s Manual
1
Chapter 1. Features and Capabilities
Chapter 1. Features and Capabilities
1.1 Introduction
This chapter introduces you to the features and capabilities of the GE
XMTC Thermal Conductivity Transmitter
. The
following topics are discussed:
•
Basic features of the XMTC thermal conductivity transmitter
•
Theory of operation
•
A system description of the XMTC, available options, and sample systems Information on optional
components is also provided, including a 24 VDC power supply, extra cable, and the TMO2D-TC Display.
•
A brief discussion of typical XMTC applications
XMTC technical specifications can be found in Chapter 5,
Specifications
. Ordering information can be found in
Appendix A,
Supplemental Information
.
1.2 Basic Features
•
The XMTC is a transmitter that measures the thermal conductivity of a binary (or pseudo-binary) gas mixture
containing hydrogen, carbon dioxide, methane or helium, and provides a 4-20 mA signal proportional to the
concentration of one of the gases in the mixture. It offers several unique design features:
•
Ultra-stable thermistors and a temperature-controlled measuring cell (55°C/131°F standard, 70°C/158°F
optional) provide excellent zero and span stability, as well as tolerance of ambient temperature variations.
•
The measuring cell design makes it highly resistant to contamination and flow vibrations. Since it has no
moving parts, the transmitter can handle the shock and vibration found in many industrial applications.
•
A 2-port version for measurement of zero-based gas mixtures using a sealed reference gas (air or nitrogen) and
a 4-port version for measurement of zero-suppressed gas mixtures (and some other special calibrations) using a
flowing reference gas are available.
•
The XMTC modular construction means that the unit can be field-calibrated quickly and easily. If desired, the
plug-in measuring cell can be replaced with a pre-calibrated spare in minutes.
•
The XMTC transmitter, with weatherproof or explosion-proof packaging, is designed to be installed as close as
possible to the process sample point. It can be located up to 4000 ft (1200 m) from a display or recorder, using
inexpensive unshielded cable.
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