Honeywell VA201T Calibration Handbook page 123

CAUTION
The test gas may be hazardous, it is important that the outlet of the Flow Housing is exhausted to a safe area.
4. Apply gas at a flow rate of 1 litre per minute for the recommended application time.
5. Adjust the span pot through the Gassing Cap access holes to read the concentration of gas applied.
6. Remove the Gassing Cap and Flow Housing and replace with the original sensor cap fitted with a new
hydrophobic assembly.
NOTE:
3OME GASES SUCH AS #HLORINE (3 AND !MMONIA CAN STICK TO THE WALLS OF TUBES REGULATORS AND SENSORS
)T IS ADVISABLE THAT WHEN CALIBRATING WITH THESE GASES THE PIPES USED ARE AS SHORT AS POSSIBLE AND THAT THE
sensor reaches a maximum value before spans are adjusted.
Sensepoint Toxic
Zero Pot
Span Pot
Non-Oxygen
Calibration Handbook
Zero Pot
Span Pot
Twin Posts
Oxygen
123