3B Scientific Barometer User Manual

3B SCIENTIFIC® PHYSICS

Barometer U11325

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 400 kPa or 4 bars.

• 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

This absolute pressure sensor with an extensive
measurement range is particularly suitable for
measuring atmospheric pressure during meteoro­logical observations and for any other experiments
dealing with atmospheric pressure. The barometer
can also be used as an altimeter in mountain
climbing.

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 by the
interface.

3. Equipment supplied

1 Sensor box
1 8-pin mini DIN connection lead, length: 60 cm

4. Technical data

Measurement range: 70 to 120 kPa

700 to 1200 mbars
Sensor type: Semiconductor sensor
Accuracy: ±1.5%
Resolution: 0.1 mbar
Connections: Serrated nozzle 4.8 mm dia.

5. Operation

• Place the sensor box in the surroundings where

the experiment is to be conducted (e.g. inside a
building, weather-protected area outdoors).

• If necessary, connect the sensor to a pressure

source with a piece of the silicone tube from
U10145.

1

6. Sample experiment

6.1 Measuring the change in atmospheric pres­sure over a period of four days

Apparatus required:
1 3B NETlog

TM

interface U11300

1 Barometer U11325

• Connect the barometer sensor box to one of

the two analog inputs, A or B, of the 3B NET-

TM

log

interface.

• In log mode, select a time period of e.g. 94

hours and record the changes in atmospheric
pressure.

Fig. 1: Changes in the atmospheric pressure over a period of four days

3B Scientific GmbH • Rudorffweg 8 • 21031 Hamburg • Germany • www.3bscientific.com

Subject to technical amendments

© Copyright 2008 3B Scientific GmbH