Instructions for use Fabius Tiro SW 3.n 49
Operating concept
Total flow tube
The total flow tube is used as a reference for the
total volume of fresh gas that is introduced in the
breathing system. The individual measured flow
values for N
2O, Air, and O2 are displayed on the
respective electronic fresh-gas flow displays.
The total flow tube remains functional if the
following faults occur:
– Fault in the electronic flow measurement
– Fault in the digital display
– Fault in the current switching circuit
In these cases, the measurement of the total flow
tube indicates the total flow measured before the
fault occurred.
To adapt the fresh-gas ratio during an existing
fault, close all flow control valves and reset the
individual flows one after another. The O
2 valve
can remain open.
Example: After closing the flow control valves, the
total flow tube indicates 2 L/min. This corresponds
to an O
2 flow of 2 L/min.
If 1 L/min N
2O is required, open the N2O flow
control valve until the total flow tube displays
3L/min.
Monitoring resolutions for fresh-gas
flow
Fabius can be configured for the following
resolutions of fresh-gas flow by DrägerService or
the authorized local service partner:
– Standard resolution (A)
– High resolution (B)
If a flow is higher than 9.99 L/min, the standard
resolution is activated.
If the standard resolution is configured, the
electronic fresh-gas flow displays show the flow in
increments of 100 mL/min (format xx.x L/min). The
virtual flow tubes (A) of the screen indicate a range
from 0 to 12 L/min.
If a high resolution is configured, the electronic
fresh-gas flow displays show the flow in
increments of 10 mL/min (format x.xx L/min). The
virtual flow tubes (B) of the screen indicate a range
from 0 to 10 L/min.
If the respective flow again drops below
9.00 L/min, the high resolution is activated.
NOTE
The total flow tube is calibrated for a mixture of
N2O and O2 in a 50/50 ratio. The accuracy of the
total flow tube might be reduced with other gas
mixtures. More information can be found in
chapter ''Technical data'' on page 182.
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