Operating Instructions PS27
6
2.
Description of the Transducer
Type PS27 differential pressure transducers are pneumatic/electrical sensors for
pressure testing (positive/negative gauge pressure and differential pressure)
purposes. They are typically used in air-conditioning and ventilation technology e.g.
pressure testing in ventilation ducts. The transducer's core is a piezoresistive
pressure transducer.
3.
Startup
3.1 Functional Description
PS27 pressure transducers are of the precision type and despite their sturdiness they
should still be treated with care. Installation right next to heat and radiation sources
e.g. radiators should be avoided as this may lead to measurement errors arising.
Ideally the appliance should be vertically mounted on a wall not subject to any
vibrations. To stop any condensed water entering the measurement cell, the
transducer together with the hose connections for positive gauge pr and
negative gauge pressure - should be pointing downwards.
The right pressure sign must be used in keeping with the following table when
connecting the pressure to the transducer:
Type of pressure
Connect pressure to
Example
pos. gauge pressure
+ input
0...1 kPa
neg. gauge pressure
- input
0...- 500 Pa
Differential pressure
Higher pressure at + input
lower pressure at - input
0...125 Pa e.g via a differential
pressure producer (e.g. measuring
orifice)
Symmetrical pressure ranges + input
200 Pa
Asymmetrical pressure
ranges
Input of the larger pressure
range
-300 Pa...+ 1 kPa
(here connect to + input)
