Honeywell VA201T Calibration Handbook page 144

Calibration Handbook
the next step.
16. If the output, with span gas applied, is not the concentration of span gas then adjust the span potentiometer
through the Gassing Cap access Holes to obtain a span gas concentration indication.
17. When the reading is stable, use '✓' to confirm span calibration.
18. The display alternates between "Purg gAS" and the gas reading to indicate that the unit is expecting the
span gas to be removed from the sensor.
19. Promptly switch off the calibration span gas and remove the Sensepoint Gassing Cap from the sensor
to allow the gas to disperse.
20. When the reading falls below 50% of the calibration gas level the display indicates a countdown (up to
180 seconds dependant on gas type).
21. When the countdown is finished, the calibration procedure is complete.
22. The instrument returns to the 'Set CAL' menu. Activate the 'S' or 'T' switch to select another menu or
select 'QuIT' to return to normal monitoring mode.
23. Remove Gassing Cap and reinstall sensor cap assembly removed in step 7.
NOTE:
2EMEMBER TO ALWAYS REPLACE THE 7EATHER 0ROTECTION AND OTHER ACCESSORIES
Zero Pot
Span Pot
Non-Oxygen
Zero Pot
Span Pot
Twin Posts
Oxygen
144 Sensepoint XCD-RTD