Operating Instructions PT-LE
6
2.
Description oft he Transducer
Type PT-LE 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
PT-LE 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 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)
3.2.
Supply Voltage Connections in the Appliance:
Fig 1: Position of components (not every component is shown)
5 4 3 2 1
5
4
3
2 1
One measurement range
Four measurement ranges
