Honeywell VA201T Calibration Handbook page 111

13. Press on the handheld; display shows
14. Press T to enter the calibration process, display shows
15. Press ; display shows
Sets analog output to inhibit level (default 2mA) for duration of calibration sequence.
16. Remove weather protection and dust barrier. Check optics are clean and dry - clean/dry optics if necessary
then refit dust barrier and weather protection
17. Wait until display shows
If zero reading in ambient air cannot be guaranteed, fit gassing cover over weather protection and apply
instrument air at one liter/minute for 30 sec.
18. Press to begin Zero Cal; display then shows
19. After 10 sec display shows; Zero is now set.
20. Once Zero Cal is complete, after a few seconds, display shows
To continue to Span Calibration, press
21. To begin Span Cal, press
22. Set gas concentration, press
Searchpoint Optima Plus
Main

Calibrate
Calibrate

Display
Calibrate

Cal Sensor
Inhibinting 4-20
Please Wait . . .
Ensure Zero Gas
Then Press Enter
Processing Data
Please Wait . . .
Zero Calibrated
Cal Span, Enter
Exit Cal, Esc
, to end calibration sequence without span calibrating, press ESC.
; display shows
Press Enter to
Select Gas Conc
; display shows
111
Calibration Handbook