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Tec 7 Vaporizer
Carrier gas composition
w w w w WARNING
Time out of service
Effects of variables
7-10
Small output decreases can occur when the carrier gas composition is changed from
100% oxygen.
When either air or nitrous oxide is employed as the carrier gas, the output is lowered
compared to the output when oxygen is the carrier gas. This effect is the greatest (up
to 20% of setting) at low flows when nitrous oxide is employed, but using nitrous oxide
reduces the required inspired concentrations of volatile agent that can, depending
upon the proportion, mitigate the decreases in output from the vaporizer.
Only operate the vaporizer with dry medical gases.
If the anesthesia machine on which the vaporizer is fitted is left for a period of time
with no gases flowing, small concentrations may be detected at the machine outlet
immediately after the gas flow is turned ON. This is a normal machine characteristic
and is caused by residual vapor left in the machine from previous use.
When the vaporizer is turned from the
high concentration may occur that rapidly stabilizes to the set concentration within
approximately 10 seconds at 5 liters/minute.
These phenomena are normal characteristics of vaporizers. In use the volume of vapor
involved is small compared to the volume of the breathing circuit.
Ambient temperature, input flowrate and duration of use can affect delivered
concentration, particularly when the vaporizers are used at extremes of the usual
clinical range.
Note
Use of the vaporizer at high gas flows and high dial concentrations may affect the
accuracy of delivered concentrations. Refer to Performance Curves in this chapter for
full information.
The valve design and temperature compensation system of Tec 7 Vaporizers reduces
the effects to levels such that, under most clinical conditions, their effect on vaporizer
performance is not clinically significant.
setting after a period out of use, a brief
1175-0013-000
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