PU/PI and PS10 Instruction Manual
6
2
Instrument description
The PU/PI and PS10 pressure transducers are pneumatic, electronic sensors for
measuring overpressures, vacuum pressures and differential pressures. Typical
applications include, for instance, pressure measurements in air-conditioning and
ventilation ducts. At the heart of the transducer is a pressure measurement capsule
with a beryllium bronze membrane spring, which is displaced by the pressure
difference between the two chambers of the measurement capsule. Inductive
displacement transducers measure membrane deflection without contacting the
membrane. The instrument has no frictional parts or parts subject to mechanical wear.
3
Start-up
3.1
Features
Although the PU/PI and PS 10 pressure transducers are highly robust, they are
nevertheless precision instruments and should be handled with care. Avoid mounting
the instruments in the direct vicinity of any sources of radiation or heat, such as
heaters, as this could result in measurement errors. Ideally, the instrument should be
mounted vertically on a wall not subject to vibration. Pressure (+) and vacuum (-)
ports should be pointing down in order to prevent any condensation from entering the
measurement cell.
When connecting pressure to the transducer, use the following table to ensure that
the sign of the pressure (+ or -) is correct.
Type of pressure
Connect pressure to
Example
overpressure
+ input port
0...1 kPa
vacuum
- input port
0...- 500 Pa
differential pressure
higher pressure at + port
lower pressure at - port
0…125 Pa, e.g. via a differential
pressure transducer (such as a
measuring orifice)
symmetrical pressure ranges
+ input port
200 Pa
asymmetrical pressure
ranges
input port corresponding to
the high end of the pressure
range
-300 Pa...+ 1 kPa
(pressure should be connected to
the + input port)
