3B Scientific Relative Pressure Sensor, ±100 hPa - Manual (Page 6)

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• Note the “positive” and “negative” labelling of
the hose connections - connect the hoses
correctly according to the effective direction of
the pressure.
• During the experiment, check that no elastic
expansion of the hose is occurring – this can
cause the pressure reading to be lower than
the correct value.
6. Application
Measurement of the pressure difference in the
Stirling engine U8440480, and analysis of the data
using 3B NETlab
TM .
7. Sample experiment
Recording operating pressures in Stirling engine
U8440480 while it is in motion
Apparatus required:
1 3B NETlog TM unit U11300
1 3B NETlab TM program U11310
1 Relative pressure sensor, ±100 hPa U11321
1 Wilke-type Stirling engine U8440480
• Set up the experiment as shown in fig. 1.
• Connect the relative pressure sensor to the 3B
NETlog
TM unit and wait for the sensor to be
detected.
• Use a suitable length of silicone hose to make
the pressure connection between the “positive”
hose connection of the sensor box and one of
the two hose connections of the Stirling
engine. The two hose connections of the
engine are identical in their function.
• Allow the engine to heat up and, after a few
minutes, set it running.
• Open the application program (template) for
the experiment with the ±100 hPa relative
pressure sensor on the 3B NETlab
TM unit.
• Measure the pressures.
• Evaluate the curve resulting from the
measurements (fig. 2).
Fig. 1 Experiment set-up for recording operating pressures in the Wilke-type Stirling engine while in motion