4-22
19.2 End stop of control valves
Open fresh-gas outlet
Open control valves
Maximum flow with valves fully open
O2 and N2O > 9 L/min. in each case
O2 and air > 9 L/min. in each case
Air option only > 14 L/min.
Checking pressure reducers if respective
max. flow is not attained.
19.3 Function of flowmeters
Reduce each flowmeter from maximum
flow to zero in 4 stages.
19.4 Test objective:
Float must never become caught (with
unit horizontally aligned)
19.5 Flow comparison measurement
(perform once a year)
Testing:
Connect flowmeter unit (7901161) to
mixed-gas outlet.
Comparison measurement of at least 3
flow values in range between 50 mL/min.
and
3 L/min. for O2/N2O and between
500 mL/min. and 6 L/min. for air.
Test objective:
Measured values within tolerance of ±10
%.
O2
Air
Total O2 and N2O flow
19.5.1 Smooth and even rotation of float of O2
and N2O low-flow flowmeter at 0.2 L/min.
Close control valves
O
O
O
☞
O
O
O
O
O
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