Alco-Sensor VXL Accuracy Check   Pre-Operation Checklist


Accuracy checks should be performed periodically to validate accuracy and to establish a performance record for your ASVXL instrument.  The frequency should be determined by your Quality Assurance Program.

Please note that the display screens for performing accuracy checks on the Alco-Sensor VXL may vary by software version.  The test sequence described here may be slightly different than the sequence on your ASVXL device.  We will be demonstrating the procedure on the General Screener version of the ASVXL.

Prior to running an Accuracy Check you should make certain that the Standard you will be using is current and all of the operating parameters for that device have been met:

  • Have as little tubing as possible between the gas out port of the standard and the mouthpiece of the Alco-Sensor VXL.
  • Check Expiration Date (on Wet Bath Simulator Solution or Dry Gas Tank)
  • Check temperature of the Wet Bath Simulator (if used) 
  • If using a Dry Gas standard, insure the tank is at room temperature
  • Purge the simulator tubing or dry gas regulator for several seconds
  • Know the current expected value of the Standard
  • If you keep a calibration log, it should be present

Insure the tools listed below are present:

  • Dry Gas Standard 
  • Regulator with a 6 Liter Per Minute regulator and mouthpiece adapter
  • True-Cal or True Cal II Device (if used)
  • Alco-Sensor VXL
  • New Mouthpiece

    Note: A calibration standard can be a: 
    • Dry Gas Cylinder and Regulator
    • Wet Bath Simulator and Solution

For this demonstration, a dry gas tank is used as the standard – value (at sea level) of .082%. a True-Cal Device was used to give the expected value of the standard at the time of our demonstration – the True-Cal will show the expected gas value adjusted for the current atmospheric pressure. Therefore, the target value for this demonstration is .080.

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