Detcon P-1000 - Manual (Page 20)

P-1000
Portable Model 1000 H2S Analyzer Rev. 1.0 Page 16 of 24
Figure 14 Auto Span Sequence
4) From the calibration menu “1-Zero Cal 2-Span Cal” proceed into the span adjust function by holding the
programming magnet stationary over “PGM 2” for 3 seconds. The display will ask for the application of
the target gas and concentration. The display reads “Apply XXPPM Span Gas” (The ‘X’s indicate the
concentration requested).
5) Apply the calibration span gas at a flow rate of 500cc/min.. When the sensor response exceeds 10% of the
applied test gas, the display will change to “Auto Span Test” for a period of 2 minutes.
If sensor response does not exceed 10% of applied gas after 1 minute, the menu “1-Abort Span / 2-Continue
Span” appears. This gives the user an opportunity to verify proper span gas delivery and concentration before
continuing forward. If it is desirable to “Abort Span” and try again, then that choice may be exercised.
6) After two minutes, the message will change to “Auto Span Adjust” for an additional 30 seconds. During
this period, the sensor will analyze the signal for stability. The criterion for stability is signal drift within
±2% of full scale in 30 seconds. If met, the message changes to “Auto Span Complete”.
7) If not met, up to 4 additional 30 second stability check periods are administered. If all 5 stability checks
fail then the unit returns to Normal Operations with the original Auto Span parameter intact. An
alternating message of “Span Calibration Fault” is displayed to remind the user that a re-calibration is still
necessary.
8) With “Auto Span Complete” achieved, the display reports the remaining “Sensor Life xx%”, and the “New
Span Date”, and then “Remove Span Gas / XX PPM” which prompts the user to remove the span gas from
the sensor. During “Remove Span Gas / XX PPM” disconnect the span gas and re-apply the zero air or N
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