9)  Carefully detach the Alco-Sensor III from the calibration assembly and place the screwdriver on the calibration screw.

10)  Observe the reading on the Alco-Sensor III.  You will have approximately 5-10 seconds to complete this step.

When the reading has surpassed the target value of the calibration standard, immediately turn the calibration screw counterclockwise until the target value and the reading on the Alco-Sensor III are the same.  Repeat this step to keep the target value the same as the calibration standard.  Never adjust the target value below the calibration standard value and never turn the screw clockwise to raise the target value to meet the calibration standard value.

If you do over adjust stop turning the calibration screw and wait to see if the target value naturally rises back to or above calibration standard value.  If it does then you may continue turning the counterclockwise to keep the target value and the calibration standard values the same.  If the target value never naturally rises back above or equal to the calibration standard you will need to restart the calibration process from Step 1.

 When the reading on the Alco-Sensor III and the target value of the calibration standard are the same and remain constant for 5 seconds, the calibration process is complete. 

 

Observe final reading Target value of the standard used for this demonstration was .080%, the instrument is calibrated.

 

11)  Once you have completed Step 10 depress the set button.

12)  It is essential to verify the calibration. Wait 3 minutes, then run an accuracy check using a new dry mouthpiece and a calibration standard.

Follow the step by step instructions in the Post Calibration Accuracy Check.

 

SET button depressed

Post Calibration Accuracy Check
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