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Each Calibration Syringe has a label indicating the model, serial
number, date and calibrated volume. The calibrated mechanical stop in each
Calibration Syringe provides an accurate and repeatable volume standard
appropriate for spirometer calibration. The mechanical stop has its
corresponding volume calibrated with a volumetric apparatus certified to
meet the accuracy requirements of the National Institute of Standards and
Technology Circular 602.
High Accuracy at a Low Cost: The Calibration Syringes
manufactured here at A-M Systems offer users a low cost method for
calibrating the volume measurements for pulmonary function analyzers.
Analyzers need to be periodically checked against a known volume to ensure
that they are in calibration. It is poor practice to depend upon an
internal calibration procedure without utilizing a known volume standard,
since studies have shown that pulmonary function analyzers may give
erroneous results (see New England Journal of Medicine 289: 1283,
1973).
Why a 3 Liter Syringe? A-M Systems offers a 3 liter
size to meet the need for a calibration syringe which will satisfy the
minimum requirements for a calibrating standard for spirometry equipment.
The American Thoracic Society, in its "Standardization of Spirometry:
1994 Update," states that "the spirometer's ability to
accurately measure volume must be checked at least daily with a
calibrated syringe with a volume of at least 3 L." The European
Respiratory Society indicates the use of "an airtight 3 liter
calibrated syringe" for the calibration of spirometry equipment in
its official statement entitled "Lung Volumes and Forced Ventilatory
Flows."
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