Operation Concept
46
Instructions for Use Fabius MRI SW 3.n
Total Flow Meter
The total flow meter serves two purposes. The total
flow meter provides a reference of the total fresh
gas applied to the breathing circuit. (Flow rate mea-
surements for each individual gas, N2O, AIR and
O2, are provided by their respective electronic flow
indicators.)
Should a fault develop in the electronic flow sens-
ing, digital display, or power circuitry, the total flow
meter is still functional. The measurement will indi-
cate the total flow rate prior to the fault condition.
To adjust the fresh gas ratios while under the fault
condition, shut off all flows (O
2 may be left on), and
then restore each gas flow individually. For exam-
ple, start with 2 L/min O2. The total flow meter will
read 2 L/min.
If 1 L/min of N
2O is needed, open the N2O flow con-
trol knob until the total flow meter reads
3 L/min: 2 L/min O
2 plus 1 L/min N2O.
NOTE
The total flow meter is calibrated for a 50/50 mix-
ture of N2O and O2. The accuracy of the flow meter
may degrade with other gas mixtures. (See the
Technical Data section for specifications.)
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