3B Scientific Absolute Pressure Sensor User Manual
3B SCIENTIFIC® PHYSICS
Absolute Pressure Sensor U11320
Instruction Sheet
10/08 Hh
1. Safety instructions
• To avoid permanent damage to the built-in
semiconductor sensor, never exceed the maximum threshold pressure of 1000 kPa.
• Suitable only for non-corrosive gases such as
air, helium and nitrogen.
• Do not allow the sensor element to come into
contact with water.
2. Description
The absolute pressure sensor with its extensive
measurement range is particularly suitable for
experiments to demonstrate Boyle’s law and for
measuring the piston pressure (PV diagram) in a
Stirling engine. In addition, the absolute pressure
sensor can also be used to record and measure the
production of oxygen during photosynthesis and
for transpiration experiments in a closed system.
Two-port measurement procedure for the pressure
sensor: nozzle 1 is connected to the external pressure via a connecting nipple, and nozzle 2 is connected to a sealed reference vacuum.
The sensor box is automatically recognised via the
interface.
3. Equipment supplied
1 Sensor box
1 8-pin mini DIN connection lead, length: 60 cm
1 Silicone tube, inner dia.: 2 mm, length: 1 m
1 Plastic syringe 20ml
4. Technical data
Measurement range: 0 to 250 kPa
Sensor type: Semiconductor sensor
Accuracy: ±1%
Resolution: 0.1 Pa
Connections: Serrated nozzle 4.8 mm dia.
5. Operation
• Use the full length of the silicone tube or shor-
ten it to the length desired.
• Use the silicone tube to connect the pressure
source to the nozzle of the sensor.
• During the experiment, the elasticity of the
tube should be taken into account – this could
possibly lead to an error in readings.
1
6. Sample experiment
6.1 Measuring the absolute pressure in relation
to the volume (Boyle’s law)
Apparatus required:
1 3B NETlog
TM
interface U11300
1 Absolute pressure sensor U11320
• Set-up the experiment according to Fig. 1.
• Fit the plastic syringe with an approx. 2-cm
long hose.
• Fill the syringe with 20 ml of ordinary air.
• Push the free end of the silicone tube onto the
nozzle of the pressure sensor.
• CAUTION: as far as possible, do not alter the
volume in the syringe!
• Connect the absolute pressure sensor to the
3B NETlog
TM
interface and wait for the interface
to recognise the sensor.
• The first reading appears on the interface dis-
play.
• In the 3B NETlab
TM
software’s manual mode,
enter the readings for the volume by hand in
steps of 1 ml at a time.
• Plot the graph of the characteristic.
Fig. 1: Measuring the absolute pressure in relation to the volume
Fig. 2: Pressure against volume
3B Scientific GmbH • Rudorffweg 8 • 21031 Hamburg • Germany • www.3bscientific.com
Subject to technical amendments
© Copyright 2008 3B Scientific GmbH
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