Alco-Sensor FST Accuracy Check

An Accuracy Check should be performed periodically. The frequency should be determined by your Quality Assurance Program.

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 FST.
• If using a Wet Bath or Dry Gas Standard check the expiration date
• If using a Wet Bath Standard check the temperature
• Purge the simulator or dry gas regulator for several seconds
• Know the current expected value of the Standard gas by using a True-Cal or Elevation Chart
• If you keep a calibration log, one should be maintained for each FST

Tools Required: Before beginning have items available: instrument, calibration standard, new mouthpiece

• Dry Gas Standard & Regulator*
  ^*(6 liter per minute (lpm) flow rate for automated or manual sampling)
  ^*(1.5 liter per minute (lpm) flow rate for manual sampling)
  See the difference between the two.
   
• True-Cal Device
• Alco-Sensor FST
• New Mouthpiece

True-Cal displays .080

Note: While wet bath Standard accuracy checks can be performed throughout the full instrument temperature range of 0ºC - 50ºC, if you are using Dry Gas as your Standard for accuracy checks, then the unit and gas should be at or between 10ºC and 40ºC.

The result of an accuracy check should not differ from the expected value by more than the tolerances prescribed by the program guidelines under which the Accuracy Check is being administered.  Usually these tolerances range from ± .005 g/210L or 5% whichever is greater, to ±.010 g/210L or ± 10% whichever is greater.

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