LION alcolmeter 500 - Calibration Check and Adjustment Procedures; Why Calibration CHECKS?; The AlcoCal Standard

lion alcolmeter
®
500 Mk IV User Handbook
29
7: The Calibration CHECK Procedure
7.1 Why Calibration CHECKS?
Your instrument is set up for use with a dry gas alcohol vapour
standard. IF A WET VAPOUR STANDARD IS TO BE USED, THIS
CAN ONLY BE DONE AFTER CONTACTING LION AND
RETURNING THE INSTRUMENT TO LION’S FACTORY.
To ensure the 500 remains fully operational and accurate, its
calibration must be CHECKED periodically; such as every two
months. The CHECK procedure is carried out using a known alcohol
vapour standard - the AlcoCal
®
.
Instrument calibration ADJUSTMENT is needed when the CHECK
procedure produces a reading that is greater than 0.03mg/L away, in
either direction, from the known value of the AlcoCal
®
standard.
As a guide, because of the high stability of the alcohol sensor and
electronics used in the 500, recalibration should not be needed more
often than every six months.
7.2 The AlcoCal
®
Standard
The lion alcolmeter
®
500 is checked for accuracy by means of an
alcohol vapour of known concentration. This standard is a mixture of
alcohol in air at a known proportion. This known mixture is then
compressed into a cylinder suitable for long-term ‘field’ use.
The breath alcohol standard so supplied by Lion is called AlcoCal
®
.