PRE-USE CHECKS
5.6
Machine Low Pressure Leak Test
NOTE
This test is necessary if the system fails the low pressure test
5.5.6.
1.
Attach a side branch connector to the CGO outlet.
Connect the side branch tube to a
sphygmomanometer.
2.
Turn on a flow of 150 ml/min of oxygen. Block the
open port of the connector with a finger.
The pressure in the low pressure gas system will
rise and be displayed on the sphygmomanometer.
3.
Check that the pressure rises to at least 100 mmHg.
Release the finger seal immediately the pressure is
reached.
CAUTION
Do not maintain closure of the open port longer than necessary
to perform the test.
This test should be performed:
(a) With all vaporizers ‘off’ and isolated.
(b) With each vaporizer in turn set to 1%.
NOTE
This test is equivalent to (and in some cases exceeds) the
requirements for system leakage rates quoted in national
standards worldwide.
5.7
Oxygen Flush
Check for a high flow of oxygen through the CGO outlet
when the flush valve button is pressed and that the flow
ceases when the button is released.
This test is most conveniently done after the breathing
system has been attached, using the reservoir bag as an
indicator of gas flow.
5.8
Anaesthetic Gas Scavenge System
(AGSS)
By inspection, check that all sources of expired
anaesthetic gases, e.g. the absorber APL valve, and the
ventilator bellows patient gas exhaust port, are
connected to an approved collection system leading to
an AGSS.
WARNING
Vacuum systems must not be connected directly to the
APL valve on the absorber. A receiving system with a
positive and negative pressure control function must be
interposed.
Systems must comply with standard ISO 8835 part 2.
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