5.2
Pre-use Checks - Gas Supply
5.2.1
Gas Pipeline Supplies
Oxygen supply:
1.
Connect the oxygen pipeline hose
only
.
Check that the correct pressure gauge
reading is obtained.
2.
Turn on the Gas Delivery switch (1).
Check that the warning whistle sounds
briefly, and that the correct basal flow of
oxygen is delivered (see section 3.8).
3.
Open both oxygen and nitrous oxide
flowmeter valves.
Check that flow is only shown in the oxygen
flowmeter.
4.
Close both valves.
Turn off the Gas Delivery switch.
Check that the warning whistle sounds
briefly, and that the oxygen basal flow is
stopped.
Nitrous Oxide supply:
5.
Connect the Nitrous Oxide pipeline hose.
Check the gauge reading.
Turn on the Gas Delivery switch (1).
Check for a flow of nitrous oxide when the
flowmeter needle valve is operated.
NOTE: cylinder supply can be used if necessary
for this test.
Air supply:
6.
Connect the Air pipeline hose.
Check the gauge reading.
Check for a flow of air when the flowmeter
needle valve is operated.
5.2.2
Gas Cylinder Supplies
CAUTION
Open the cylinder valves slowly to avoid damage to the
pressure reducing valve and pressure gauges. Ensure
that valves are at least one full turn open when in use.
1.
Fit the gas cylinders to their respective
yokes, open the cylinder valves one at a
time and check the pressure on each gauge.
NOTE
a) When two cylinders are provided for a single gas,
test each separately, clearing pressure after each
test by opening the flowmeter valve.
b) Turn off the reserve cylinders during normal use.
c) N
2
O: cylinder pressure does not indicate cylinder
content.
2.
Ensure that all flowmeters are kept closed
until gas supplies are required.
PRE-USE CHECKS
21
CAUTION
The mechanical AHD system
requires that the oxygen flowmeter
control is restricted to prevent the
needle valve from fully closing.
This ensures a minimum oxygen
basal flow.
DO NOT attempt to close the flow
to zero.
Do not overtighten the knob.
1
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