Alco-Sensor III Calibration

Prior to calibrating it is critical that you know the expected value of the calibration standard you are using. (The value of the standard will be found on the label on the Mini-Alco Can, Dry Gas Cylinder, True-Cal device (see previous picture) or Bottle of Wet Bath Simulator Solution).

Check Instrument Temperature

Make certain that the instrument temperature is between 20°C and 40°C. If not, warm or cool the instrument until it is within this range.


Temperature window

Alco-Sensor III Displays .000 – Pre-Calibration "Blank"

1)  Depress read button, .000 should be seen for at least 5 to 10 seconds.

If .000 is not seen, depress set button and recheck in one minute. (The unit must display .000 for 5 to 10 seconds before proceeding.)


READ button depressed ASIII displays .000


2)  Follow instructions on the dry gas standard to mount the regulator.

3)  If this is the first test from the dry gas standard today, purge regulator by depressing button/valve on regulator for approximately 3 to 4 seconds.


Set button depressed


4)  Insert screwdriver in calibration screw hole located on right side of unit.


5)  Turn screw one or two revolutions clockwise to over sensitize the instrument.
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