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2. Specification
Calibration
Vaporizers are calibrated at 21 °C and at elevated
temperatures. The variation in output with temperature,
flowrate and duration of use is smeill, and the variation in
output when used with Intermittent Positive Pressure
Respiration is negligible.
The control dial is calibrated to the levels shown on the
p>erformance curves.
Resistance t o Gas Flow
5 cm.wg at the 'OFF' setting at 5 litre/min Oj.
21-29 cm.wg. when delivering vapour ait 5 Utre/min Oj at
22°C.
Duration of Use
The rate of consumption of anaesthetic agent depends
primarily on flowrate and vapour output concentration. As
an approximate working figure 1.0 ml of liquid anaesthetic
is required to provide 200 ml of vapour.
The rate of evaporation of anaesthetic agent may with
caution be used as an approximate method of checking
that the delivered output is not grossly in error, and as a
means of estimating how often the vaporizer is likely to
need refilling.
The approximate hourly consumption of anaesthetic agents
can be expressed as follows:
3 X % X F
Where % represents the setting of the vaporizer output
percentage, F represents the input flowrate in litre/min.
Example; If a vaporizer is set to deliver 2 % at 6 Utre/min
total input gas flowrate:
Approximate rate of agent consumption
= 3 x 2 x 6 = 36 ml/hour.
The figures are intended only for clinical guidance and are
approximate. They wiU vary depending upon the type of
anaesthetic agent employed, accuracy of graduation of
flowmeters etc. and will be grossly in error if the vaporizer
drain port is not fuUy closed.
Liquid Capacrity
Amount of anaesthetic agent to fully charge the vaporizer
= 125 ml. (nominal)
Amount retained by Wick System = 35 ml. (nominal)
Weight a n d Dimensions
Weight 6.3Kg
Height 205 mm
Depth
145 mm
Width
135 mm
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