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6.4
Gas Flow Through The Vaporizer
6.4.1
General
The output concentration of the Tec 5 vaporizer is regulated by the 'variable flow-split' method
described in the following text and illustrated on Fig. 16 and 17:
A total flow of fresh gas from upstream flowmeters enters the vaporizer at
split into two streams. One stream flows into the fresh gas by-pass circuit and the other stream flows
through the vaporizing chamber where it is enriched with the vapour of the liquid anaesthetic agent.
6.4.2
By-pass Circuit
The by-pass circuit includes the gas transfer manifold and also a thermostat assembly which is located
at the base of the vaporizer.
The fresh gas flows through the by-pass circuit vertically downwards from
b , through the thermostat to c and back up the gas transfer manifold via d to e as illustrated on
Fig. 16.
The thermostat deflects according to its temperature to control the resistance offered to the flow of gas
through it. This deflection varies the relative proportions of gas flowing through the by-pass and
vaporizing chamber circuits, as described in Section 6.3.
3
FROM
FLOWMETER
1
a
6.4.3
Vaporizing Chamber Circuit
The fresh gas flow through the vaporizing chamber, illustrated on Fig. 17, flows from
2
sump cover
where it is diverted via
through the Intermittent Positive Pressure Ventilation (IPPV) compensating assembly via
Gas now flows from the IPPV assembly via
up anaesthetic vapour and then flows across the base of the vaporizing chamber above the liquid agent
8
to
.
From the base of the vaporizing chamber the gas/agent mixture flows via
the proportional radial drug control groove of the rotary valve and then back into the sump cover
where it combines
The combined total flow then flows out from the vaporizer and via the Selectatec circuitry to the anaesthesia
system common gas outlet.
Tec 5 Vaporizer
O & M Manual Part No. 1105-0100-000
ROTARY
VALVE
SHUT-OFF
4
OPEN
VAPORIZING
CHAMBER
b
THERMOSTAT
Fig. 16 Vaporizer Flow - Schematic Diagram
3
through the central cavity of the rotary valve and back
7
bl
with the fresh gas from the by-pass circuit.
1
a across the sump base
FLOW CONTROL
7
10
(VAPOUR CHANNEL)
014A T5 OM
c
down through the tubular wick assembly where it picks
9
where it is immediately
TO COMMON
GAS OUTLET
11
d
e
1
across the
4
5
6
,
and
.
through the sump cover to
bk
Page 19
August 1999
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