Features and Capabilities 1-1
September 2007
Introduction This chapter introduces you to the features and capabilities of the GE
Sensing XMO2 Thermoparamagnetic Oxygen Transmitter. The
following specific topics are discussed:
• Basic Features - a brief discussion of the XMO2 Transmitter’s
basic features and capabilities
• Theory of Operation - details on the sensor’s construction and
how the measurements are made
• System Components - a description of the available XMO2
options and the required sample system
Note: The XMO2 technical specifications and ordering information
can be found in Chapter 8, Specifications and Factory Data.
Basic Features The XMO2 Transmitter measures the concentration of oxygen in the
0-100% range in a variety of gas mixtures, and it provides a 4-20 mA
analog output signal that is proportional to the oxygen concentration.
In performing these measurements, the microprocessor-based XMO2
provides automatic oxygen signal compensation for background gas
composition and/or pressure variations. In addition, the XMO2 is
equipped with Fast-Response software, real-time error detection, and
push-button field calibration.
The XMO2 Transmitter offers several unique design features:
• Ultra-stable thermistors and a measuring cell that is temperature-
controlled at 45°C (113°F) provide excellent zero and span
stability, as well as a high tolerance to ambient temperature
variations. Optional measurement cell operating temperatures of
60°C (140°F) and 70°C (158°°F) are available for special
applications.
• The measurement cell design is resistant to contamination and
relatively tolerant of sample gas flow rate variations. As it has no
moving parts, the XMO2 performs reliably under the shock and
vibration found in many industrial applications.
• The XMO2’s unique “bridge-within-a-bridge” measurement
circuit and microprocessor-based operation automatically
compensate the oxygen signal for variations in the magnetic and
thermal properties of the background gas that would otherwise
cause measurement errors.
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