Alco-Sensor III Calibration
6)  Attach your instruments mouthpiece to the end of the regulator line – small plastic tubing (this is referred to as the calibration assembly). Make certain there is a good seal between the connector and the mouthpiece.


7) If you are using a dry gas standard,depress the button on the regulator for 6 seconds. (If you are using a Wet Bath Simulator & Solution for a standard, you should blow into the inlet port of the simulator for at least six seconds). 

Using either type of standard, on the 4th or 5th second of the 6 second count, press and release the READ button. 

Regulator button depressed


(NOTE: The gas/vapor must be flowing through the mouthpiece when the READ button is depressed and it is suggested that it flow for at least one second after the READ button has been depressed).


8)  Carefully detach the Alco-Sensor III from the calibration assembly. Observe the display on the Alco-Sensor III. A moving dash --- will appear on the display before the display shows the value used in the previous calibration (as long as the calibration screw has not been adjusted).  If the displayed value is the same as the calibration standard you are currently using, proceed to step 10. If the displayed value is different than your current calibration standard, follow the procedure detailed in step 9. 

9)  Place the screwdriver (must be non-metallic) in the calibration screw hole on the side of the instrument and turn the calibration screw until the reading on the instrument’s display is equal to the current target value of your standard. (Turn clockwise to increase the value; turn counterclockwise to decrease the value). Once this is accomplished remove the calibration screwdriver without further changing the displayed value on the instrument.

Screwdriver in screw hole

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