GE XMO2, User Manual

Page: 43 / 196

Field Calibration 4-1
September 2007
Introduction
This chapter provides information on calibrating the XMO2 in the
field using either a one-gas (offset gas) method or a two-gas (zero gas
and span gas) method. The following specific topics discussed:
•
factory calibration procedures
•
updating the factory calibration
•
required calibration materials
•
Getting the XMO2 ready and locating the calibration switches.
•
How to perform a one-gas (Offset Gas) Pushbutton or RS232
Digital Communication calibration.
•
How to perform a two-gas (Zero and Span Gas) Pushbutton or
RS232 Digital Communication calibration.
Factory Calibration
Procedures
Prior to shipment, your XMO2 was calibrated at the factory for the
%O
2
range specified at the time of purchase. The following standard
%O
2
ranges are available:
•
0 to 1%
•
0 to 25%
•
0 to 2%
•
0 to 50%*
•
0 to 5%
•
0 to 100%*
•
0 to 10%
•
80 to 100%*
•
0 to 21%
•
90 to 100%*
* Pressure compensation is required
In addition, your XMO2 was calibrated at the factory for the
compensation signal specified at the time of purchase. The following
standard compensation signals are provided:
•
Background Gas Compensation - the standard factory calibration
uses N
2
and CO
2
as the background gases.
•
Pressure Compensation - the standard factory calibration is for
atmospheric pressure (700-800 mm of Hg).
Note:
Compensation signals are available for special background
gases and/or special pressure ranges. For availability,
pricing, and delivery, 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.