GE XMO2, User Manual

Page: 17 / 196

September 2007
1-8 Features and Capabilities
The Sample System
A sample system is mandatory for use with the XMO2 transmitter.
The specific design of the sample system depends on the conditions
of the sample gas and the requirements of the application. At a
minimum, the sample system should include a sample gas flowmeter
and a gas flow regulator valve.
In general, the sample system must deliver a clean, representative
sample of the gas mixture to the XMO2 transmitter at a temperature,
pressure, and flow rate that are within acceptable limits. The standard
XMO2 transmitter sample gas conditions are as follows:
•
-20° to +40°C (-4° to +104°F), at the standard measurement cell
operating temperature of 45°C (113°F)
•
atmospheric pressure
•
1.0 SCFH (500 cc/min) flow rate
GE offers sample systems for a wide variety of applications. A typical
sample system for use with the XMO2 transmitter is shown in
Chapter 2,
Installation . For assistance in designing your own sample
system, please consult the factory.
IMPORTANT:
ATEX compliance with EN 50104 requires both:
•
Fast Response calibration of the XMO2 transmitter
•
Pressure Compensation of the XMO2 or constant control of the
sample system pressure.
Long Cables (optional)
GE provides a standard 10 ft (3 m), 4-conductor, color-coded cable
with each XMO2 to connect to the power input and the analog output.
Optional cables are available in lengths up to 450 ft (137 m) as P/N
X4(*), where * specifies the length in feet. For longer cables or to use
your own cable, refer to Chapter 2,
Installation , for
recommendations.
Power Supply (optional)
The XMO2 requires 24 VDC input power at a maximum start-up
current of 1.2 A. The GE PS5R-C24 power supply may be used to
convert 100-240 VAC to the required 24 VDC.
The TMO2D Display/
Controller (optional)
The GE TMO2D Display/Controller provides a two-line x 24-
character back-lit LCD display for the XMO2’s 4-20 mA analog
output signal. It also permits display and option programming via its
keyboard. Additional features include: recorder outputs, a real time
clock, alarm relays, and relays for driving sample system solenoids
for automatic zero and span calibration. For more information on the
TMO2D, please consult the factory.