3 Components and functions
18 SA-112-0106V1.0-WEM-GB © F. Stephan GmbH
Fig. 10: PNT and pressure fitting
1 hose heating socket
2 temperature sensor socket
4 electrical connection magnetic
coil
3 pneumotachograph connector 5 pressure fittings
6 water bath connectors
The calibration block allows for offset calibration of the differential
pressure sensor and the oxygen sensor.
The interposed solenoids V4 and V5 switch the measuring lines of the
differential pressure sensor against the atmosphere. The valves are
switched at exactly the same time. The value measured in this way
corresponds to a flow of 0 l/min.
FiO
2
measurement is carried out using an electrochemical cell (fuel cell).
This oxygen sensor generates a voltage depending on the prevailing
oxygen concentration. The voltage is then converted electronically into a
corresponding signal.
To calibrate the oxygen sensor, compressed air ( 21% O
2
) is blown
against it via solenoid V6. During this procedure, the display shows
"CAL" in the window of the FiO
2
value. After completing calibration, the
valve switches the oxygen sensor back to the output of the double
flowmeter.
Calibration bloc
FiO
2
measurement
3
6
2
4
5
1
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