AM852 Veterinary Anaesthesia machine User’ Manual
13
at (20 ± 3) ° C, and maintain this temperature throughout the test procedure.
3. Fill the AVDD with the appropriate anaesthetic agent to approximately half of the
maximum usable volume, and leave it to stand for at least 45 min.
If the manufacturer recommends that when power is applied to the AVDD, a warm-up
period be allowed before use, power shall be applied for at least that period before
testing. This period may be within the 45 min.
4. With the AVDD control in the “Off”, “0” or, if applicable, “Standby” position, set the
gas flowrate through the anaesthetic system to (2 ± 0,2) l/min and adjust the
anaesthetic ventilator to give (15 ± 2) breaths/min at an I:E ratio of 1:2 ± 20 % with
the inspiratory flow control set to maximum.
For an anaesthetic system in which the fresh gas flow is determined by the anaesthetic
ventilator settings, set these to give a minute volume of (2 ± 0,2) l.
Introduce a maximum pressure fluctuation of (2 ± 0,3) kPa (above ambient) at the
fresh gas outlet, ensuring that the decay time during the expiration period (from
100 % of the fresh gas outlet pressure at the end of the inspiration period to 33 % of
this pressure) is less than 0,6 s.
Note: This can be achieved by using a test lung having a compliance of 0,2 l/kPa and an
Maintain the pressure fluctuations for 3 min, and after that time measure the
concentration of anaesthetic vapour delivered over a further 1 min period while
maintaining the pressure fluctuation. Calculate the average vapour concentration in
the total delivered gas flow.
5. Repeat the procedure described in 4. with the AVDD set to each of the other settings,
and in the order given in Table 2-1. If the AVDD is not marked with the concentration
settings given in Table 101, use the nearest settings on the AVDD. If any setting
given in Table 101 is equidistant between settings on the AVDD, use the lower setting
on the AVDD.
Table 2-1 — Settings to be used for testing delivered concentration
Off, Standby, and zero, if separately marked
lowest graduation above zero
10 % FS
20 % FS
50 % FS
75 % FS
maximum graduation (full scale)
a If 10 % of full scale (FS) is the lowest graduation, step 2 is omitted.
6. Repeat the procedure in 4. and 5., using a fresh gas flowrate of (8 ± 0,8) l/min and a
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