CAI 700M - Page 58

700M HFID 6-2-15
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1. Zero Range 1 Purging – Allows time for the zero gas to flush out any residual gases
that may still be present in the detection path.
2. Zero Range 1 Calibrating – The calculated averaged zero is set as the new offset value,
as long as it is within the Maximum Calibration Error limits.
3. Zero Range 1 Verifying – The analyzer verifies that the calibrated zero value has not
deviated outside the operator-set allowable Maximum Verifying Error.
4. Span Range 1 Purging – Allows time for the span gas to flush out any residual zero gas
that may still be present in the detection path.
5. Span Range 1 Calibrating – The calculated averaged span is set as the new gain value,
as long as it is within the Maximum Calibration Error limits.
6. Span Range 1 Verifying – The analyzer verifies that the calibrated span value has not
deviated outside the operator-set allowable Maximum Verifying Error.
7. Purging With Sample – Introduces sample gas back into the analyzer and clears out any
remaining gases so the current measurements will not be affected by any residual
calibration gases.
After these steps, if the calibration is successful, the display will briefly indicate Calibration
Finished in place of Calibration in Progress at the top of the screen. After a successful
calibration is completed, the analyzer will return to the Measure Screen.
If the calibration is unsuccessful, the display will briefly indicate Could Not Calibrate in the
Current Status line. At the same time, you will be alerted to whether an error occurred in the zero
or span portion of the calibration (for example, Span Gas Deviation Error!). The analyzer will
then return to the Measure Screen and will revert to the last successful calibration values. A
calibration error is set and will remain until cleared by a successful calibration.
To view the verifying zero or span deviations, go to the AutoCal Deviations menu under
Calibration Factors. To view or change the maximum allowable calibration tolerances, see
Deviation Limits.