XMTC User’s Manual 63
Appendix B. Typical Applications
B.1.6b Calibration
Refer to Chapter 4, Calibration, for the complete XMTC calibration procedure. The procedures below are only a
supplement to that procedure. These procedures show the valve configurations necessary to deliver the calibration
gases to the XMTC.
Zero Gas Calibration:
1. Fully close N1.
2. Fully open N2.
3. Adjust N4 until the flowmeter reads mid-scale. The pressure gauge should read 0 psig.
Allow enough time for the tubing to be cleared of the sample gas before making any adjustments to the transmitter.
Span Gas Calibration:
1. Fully close N2 (or N1).
2. Fully open N3.
3. Adjust N4 until the flowmeter reads mid-scale. The pressure gauge should read 0 psig.
Allow enough time for the tubing to be cleared of the zero (or sample) gas before making any adjustments to the
transmitter.
Returning to Standard Operation:
1. Fully close N3 (or N2).
2. Fully open N1.
3. Adjust N4 until the flow meter reads mid-scale. The pressure gauge should read 0 psig.
After the system has come to equilibrium, the sample system should be checked periodically to insure that there is flow
through the flow meter.
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