GE XMTC, User Manual

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XMTC User’s Manual 43
Chapter 4. Calibration
Chapter 4. Calibration
4.1 Introduction
This chapter provides information on calibrating the XMTC in the field using zero, span, and reference gases. The
following topics are discussed:
•
General considerations for calibration at the factory and in the field
•
What you will need before you begin calibrating
•
Getting the XMTC ready and locating the adjustment potentiometers
•
Calibrating the 2-Port (sealed reference gas) XMTC with zero and span gases
•
Calibrating the 4-Port (flowing reference gas) XMTC with zero, span, and reference gases
4.2 Gas Ranges and Types
The XMTC was calibrated at the factory for the range and gas mixture specified at the time of purchase. The following
standard ranges and gases are provided:
Note:
Calibrations can be performed for special ranges and gases upon request.
The XMTC requires recalibration every 2 to 6 months, depending on the application. The exact calibration interval will
depend on such factors as: components of the binary gas mixture, desired accuracy, range, and cleanliness of the
sample gas. You can recalibrate the XMTC for the same range and binary gas mixture as the previous calibration using
just the zero and span adjustments.
Ranges: 0-2% Gases: H
2
in N
2
0-5% He in Air
0-10% He in N
2
0-25% CH
4
in CO
2
(minimum range 0-10% CH
4
)
0-50% CO
2
in Air (minimum range 0-20% CO
2
)
0-100% CO
2
in N
2
(minimum range 0-20% CO
2
)
50-100%
80-100%
90-100%
95-100%
98-100%