Datex-Ohmeda S/5 Anesthesia Monitor
Document No. 800 1005-1
42
3.4
Adjustments and calibrations
See
User’s Reference Manual
for normal gas calibration instructions.
3.4.1
Gas sampling system adjustment
Flow rates should be measured and possibly adjusted under the following conditions:
•
After any part within the sampling system has been replaced
•
Gas response is slow
NOTE: Adjust the flows with a new, clean D-fend water trap and original Datex-Ohmeda sampling
line.
NOTE: Before adjusting the flows, make sure that there is no leakage in the sampling system.
NOTE: Let the monitor warm up for 30 minutes before measuring flow rates.
For the flow rate measurements a flowmeter with a low flow resistance and capability to measure
low flow rates is required. A normal length of sampling line has to be connected to the monitor as it
has a considerable effect on the flow.
The flow rates are adjusted by changing the flow resistance cassettes (constriction cassettes) in the
sampling system. See Table 2 in chapter “
Gas sampling system”
for the alternative cassettes.
The adjustments and the respective constrictions to be adjusted are shown in the next figure, see
also chapter
“Gas sampling system”
to see gas sampling system block diagrams for modules
manufactured since autumn 1998.
3.4.2
Flow rate measurement
If any flow rates are not correct, first replace the D-fend water trap. Then recheck the
incorrect flows before adjusting the flow rates.
The sampling flow rate is measured by a flowmeter at the sampling line. The rate should be
between 180 and 220 ml/min.
The sampling flow rate is adjusted by changing the flow cassette which is located between the
pump and the damping chamber.
Due to two different tubing layouts, if the described location does not contain a flow cassette, the
sampling flow rate is adjusted by changing the flow cassette that is located between the pump and
the sample gas out connector.
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