Bypass Circuit; Vaporizing Chamber Circuit - Datex-Ohmeda Tec 7 User's Reference Manual

Tec 7 Vaporizer

Bypass circuit

1
Vaporizing chamber
6-2
The bypass circuit includes the gas transfer manifold and also a thermostat assembly
that is located at the base of the vaporizer.
The fresh gas flows through the bypass circuit vertically downwards across the sump
base through the thermostat and back up the gas transfer manifold to the common
gas outlet as shown in Figure 6-1.
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 bypass and vaporizing chamber circuits.
6
2
1. Gas from flowmeter
2. Sump base
3. Thermostat
4. Gas transfer manifold
5. To common gas outlet
6. Shut-off open
7. Vaporizing chamber
8. Flow control (vapor channel)
9. Rotary valve
Figure 6-1 • Bypass circuit
The fresh gas flow through the vaporizing chamber, as shown on Figure 6-2, flows from
the flowmeter across the sump cover where it is diverted through the central cavity of
circuit
the rotary valve and back through the Intermittent Positive Pressure Ventilation (IPPV)
compensating assembly.
Gas now flows from the IPPV assembly down through the tubular wick assembly where
it picks up anesthetic vapor and then flows across the base of the vaporizing chamber
above the liquid agent.
From the base of the vaporizing chamber the gas/agent mixture flows through the
sump cover to the proportional radial drug control groove of the rotary valve and then
back into the sump cover where it combines with the fresh gas from the bypass circuit.
The combined total flow then flows out from the vaporizer and via the Selectatec
circuitry to the anesthesia gas delivery system.
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8
7
3
4 5
1175-0013-000