22 Prima 451 – User Manual
Installation and Pre-use Checks
5.2.3
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5.2.3.1 Flow C
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Conventional flow tubes
1. Turn on the Gas Delivery switch (1).
Check that the correct basal flow of oxygen is displayed
(see section 4.8).
2. Open the nitrous oxide flowmeter needle valve and check
that the flow of oxygen increases.
3. Operate the oxygen flowmeter needle valve.
Check that full scale of flow of oxygen can be achieved.
4. Check that the floats in both tubes move freely when
flows are adjusted, and rotate when at a steady flow.
5. Operate the flowmeter control knobs in turn to check:
(a) the full scale of flow can be obtained;
(b) the flow can be turned off by gentle rotation of the
knob.
6. Check that:
(a) the floats move freely when flows are adjusted, and
rotate at a steady flow;
(b) the floats reseat on the bottom stop.
7. Dual cascade conventional flow tubes (2):
Check that gas flow is through the low flow tube initially
until full flow is achieved, then through the high flow
tube.
8. Auxiliary conventional flowmeter (optional) (3):
Rotate the flowmeter control and check that a gas flow can
be obtained.
5.2.4 Machine Low Pressure Leak
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NOTE
1. Attach a side branch connector to the CGO outlet (1).
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 75 cmH
2
O.
Release the finger seal immediately the pressure is
reached.
This test should be performed:
a) With all vaporizers ‘off’ and isolated.
b) With each vaporizer in turn set to 1%.
5.2.5 Oxygen
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Check for a high flow of oxygen through the CGO outlet (1)
when the flush valve button (2) 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.
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