4-2
4.3 Input Fresh Gas
4.3.1 Set O
2,
N
2
O and Air Inputs
1. Connect the gas supplies correctly and ensure adequate gas pressure.
2. You can control the O
2,
N
2
O and Air flows in the fresh gas through the O
2,
N
2
O and Air
flow controls. Readings of the gas flow can be seen on the respective electronic
flowmeter. On the left hand of the electronic flowmeters is the total flowmeter showing
the flow of the mixed gas.
îš‹ The O
2
and N
2
O flow controls constitute a chain linkage:
îš‹ Turn the N
2
O flow control counterclockwise to increase the N
2
O flow to some
extent. Then continuing turning the N
2
O flow control will cause the O
2
flow control
to turn counterclockwise together to increase the O
2
flow, keeping the O
2
concentration in the mixed gas above 25%.
îš‹ Turn the O
2
flow control clockwise to decrease the O
2
flow to some extent. Then
continuing turning the O
2
flow control will cause the N
2
O flow control to turn
clockwise together to decrease the N
2
O flow, keeping the O
2
concentration in the
mixed gas above 25%.
NOTE
z This anesthesia machine can be used alone as a ventilator. You can adjust O2
concentration in the breathing system through the O2 flow control.
z The O2 concentration in the fresh gas may be quite different from that in the
breathing system.
z The total flowmeter is calibrated based on 100% O2. The accuracy of the
flowmeter may degrade with other gas or mixed gas.
z When viewing the readings on the total flowmeter, keep your visual angle at the
same level of the float. The reading of a same scale may vary when viewed at a
different angle.
z If the readings shown on the electronic flowmeters differ from that on the total
flowmeter, the former shall prevail and the latter is an approximate value.
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