Calibration Handbook
27VA301M / S301M
VA301M Calibration Procedure
1. Warm-Up Period
If the VA301M doesn’t have a display, remove the cover and plug in a cover with display in J3.
Turn the unit on for a minimum of five (5) minutes.
Check Calibration Information for specific warm-up time.
VA301M CALIBRATION INFORMATION
Gas Scale Warm-up Flow Rate
CO 0 - 250 ppm 5 min 500 ml/min
NO2 0 - 10 ppm 5 min 500 ml/min
C3H8 0 - 50% LEL 15 min 50 ml/min
CH4 0 - 100% LEL 5 min 500 ml/min
H2 0 – 100% LEL 5 min 500 ml/min
2. Connecting the Hardware
Screw the regulator to the appropriate calibration gas cylinder.
Adjust the regulator with the suitable flow rate.
Plug the calibration adaptor onto the gas sensor inlet.
Connect the regulator outlet to the calibration adaptor as shown.
or
58 Liter
Calibration
Gas Cylinder
103 Liter
Calibration
Gas Cylinder
Calibration cap
3. Adjusting the Zero (if required)
This must be achieved in a well ventilated area where there is no presence of the target gas.
If you suspect the presence of the target gas in the area, inject zero gas at the specified flow rate for a
minimum of 2 minutes prior to doing a Set Zero.
Press the Enter key, and using the Scroll key enter the VA password.
Using the Scroll key select Zone 1 (built-in CO sensor) or Zone 2 (remote sensor) and press Enter.
Scroll to get the Set Zero menu.
Press Enter to start the zero calibration.
Wait will be displayed on the screen until calibration is completed.
Scroll until Back is displayed, press Enter.
Scroll until Quit is displayed, press Enter to exit.
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