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.
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