3B Scientific Relative Pressure Sensor User Manual
3B SCIENTIFIC
Relative Pressure Sensor, ±100 hPa U11321
Instruction sheet
03/08 Hh
®
PHYSICS
1. Safety instructions
• To avoid permanent damage to the internal
semiconductor sensor, the maximum
permitted relative pressure of 4000 hPa must
never be exceeded.
Only suitable for use with non-corrosive gases such
as air, helium or nitrogen.
• Do not allow the sensor element to come into
contact with water.
2. Description
Relative pressure sensor with a measurement range
up to 100 hPa, suitable for measuring the pressure
on the piston of the Wilke-type Stirling engine
U8440480 (for a pV diagram).
For two-port measurement using the sensor, hose
connections are provided for two inputs.
The sensor box is designed to be detected
automatically by the 3B NETlog
TM
unit.
3. Equipment supplied
1 Sensor box
1 MiniDIN 8-pin connector cable, 60 cm long
1 Silicone hose, internal diameter 2 mm, 1 m long
4. Technical data
Measurement range: ± 100 hPa
Sensor type: Semiconductor sensor
Accuracy: ± 1 %
Resolution: ± 1 hPa
Connections: 2 hose connections,
4.8 mm diameter
5. Instructions
• Cut the silicone hose into sections of the
required length.
• Using the lengths of hose, make the pressure
connections between the sensor box and the
Stirling engine.
1
• 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
1 3B NETlab
TM
unit U11300
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
• Measure the pressures.
• Evaluate the curve resulting from the
TM
unit.
measurements (fig. 2).
Fig. 1 Experiment set-up for recording operating pressures in the
2
Wilke-type Stirling engine while in motion
Loading...