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6
Checking the Calibration
The performance of the Apollo Tec 3 Style vaporisers, which are in clinical
use, is monitored by observing patient signs and consumption of anaesthetic
agent. The vaporiser is to be used with halogenated anaesthetic agent
monitoring equipment complying with ISO/IEC 80601-2-55.
Some users may, however, wish to employ analysers to determine whether
any abnormalities of performance have developed. For field checking of the
state of calibration, many techniques and analysers are available. Norvap
International do not recommend any one technique or analyser, but account
must be taken of errors of use and calibration of analysers. Ensure that the
appropriate carrier gas is used. The reliability of both the vaporiser and the
analysis system must be realistically considered.
If user requires that calibration verification is carried out on a vaporiser, to
determine whether any abnormalities of performance have developed the
following points must be considered:
1.
The test method must be so designed that it follows closely the
clinical conditions of use.
2.
The sampling technique is fully respective of the vaporiser output
and that it ensures that the absorption of agent by connecting
tubing is negligible.
3.
If a number of vaporisers are being tested together and a consistent
error is seen, it is very unlikely that it is due to a fault with the
vaporiser. The apparent error probably lies in the test method
employed.
4.
Reproducibility and consistency within the analytical technique must
be used.
5.
Considerations into the effects of the carrier gas composition.
6.
If obscure results are obtained from what is expected the accuracy
of the test equipment and/or test technique must be questioned and
verified.
7.
Considerations of the effects of altitude and ambient temperature
must be allowed for, the readings and output can vary under
Doc. No. 157
20 March 2019
Issue 1.0 Draft
Apollo Operations Manual
Page 22 of 27
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