lion alcolmeter
®
SD-400 User Handbook [v7]
9. Calibration Checks and Adjustment
9A. Background
The sensitivity of fuel cell to alcohol vapour changes slowly with time.
Therefore, to ensure continued optimum instrument operation, it is
necessary to CHECK its accuracy at regular intervals, and to carry
out an appropriate ADJUSTMENT when necessary.
It is for the user organisation to decide how often the accuracy is
checked, but it is recommended that a Calibration CHECK is
carried out at least once per month. Calibration ADJUSTMENT is
only required when the reading obtained from the calibration check is
unacceptable to the organisation; for example greater than 5% or
10% away from the value of the standard so used.
But of course, a calibration check can also be carried whenever it is
necessary to verify the accuracy of a breath test reading.
9B. AlcoCal
®
Alcohol Standards
The calibration check and adjustment processes are most
conveniently carried out using and AlcoCal
®
alcohol vapour
standards. This is a mixture of alcohol vapour in air at a known
concentration, contained in a pressurised cylinder.
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