APLISENS Sp. z o.o., ul. Morelowa 7

, tel. [phone]

fax [phone], www.aplisens.com.pl, e-mail: aplisens@

.pl

, 03-192 Warszawa

aplisens.com

Version II/2002

PR-28 Differential pressure transmitter

∅

27

151

Example connection of impulse line

Flat seal

Straight connector with type C nut

PN-82/M-42306

∅

6...9 Cable

∅

9

2

15

M20×1.5

102

SW27

M6×7 assembly hole

Electrical Connector

DIN 43650 with PG-11

Packing Gland; IP 65

rated Ingress Protection

PD type

Electrical Cable Connection;

IP 67 rated Ingress Protection;

Cable length 3 m (unless the

order states otherwise)

PK type

Black (–)

Red (+)

ü Any range from 4 kPa up to 2.5 MPa
ü 4 ÷ 20 mA two-wire transmission
ü Exi

a

I/IICT6 spark proof

Application

The PR-28 transmitter is designed to measure differen-

tial pressures of gases, vapours and liquids.

Design

The measurement element is a piezoresistive silicon

sensor separated from the medium by isolating dia-

phragms and a selected type of manometric liquid. The

housing of the circuit is IP 65 or IP 67 rated depending

on the type of Electrical Connector used.

Calibration

Potentiometers can be used to shift the zero position and

the range by up to ±10%, without altering the settings.

Assembly

In view of its small mass, the transmitter can be

mounted directly on the pressure system. An M6×7

threaded hole can be used for mounting. We suggest the

use of a pre-assembled Aplisens unit to mount it any-

where on a

∅

25 pipe.

The use of 3- or 5-valve manifold enables the transmitter

to be reset in place and impulse lines to be used (air and

water removal).

Measurements in hazardous areas

The PR-28 transmitter is spark-proof and is Exi

a

I/IICT6

rated (under KDB decision no. 98.458W).
The installation of the transmitter in a hazard zone re-

quires the use of a spark-proof power supply and meas-

urement circuit certified as fulfilling the following condi-

tions: I

max

93 mA, U

max

28 V.

We recommend the use of the Aplisens ZS-30Ex spark-

proof power supplier/separator.

Version II/2002

APLISENS Sp. z o.o., ul. Morelowa 7

, tel. [phone]

fax [phone], www.aplisens.com.pl, e-mail: aplisens@

.pl

, 03-192 Warszawa

aplisens.com

Technical data

Any measurement range 4 kPa ÷ 2.5 MPa

Measurement Range

10 kPa

40 kPa

up to 2.5 MPa

Static Pressure Limit

Overpressure Limit

(repeated – without hysteresis)

50 kPa

200 kPa

3 × range (max 3.4 MPa)

Damaging Overpressure

100 kPa

400 kPa

4 × range or 6 MPa

Accuracy

0.5%

0.3%

Thermal error of zero

Typical 0.3% / 10°C

maximum 0.5% / 10°C

Typical 0.3% / 10°C

maximum 0.4% / 10°C

Typical 0.2% / 10°C

maximum 0.3% / 10°C

Thermal error of span

Typical 0.3% / 10°C

maximum 0.4% / 10°C

Typical 0.2% / 10°C

maximum 0.3% / 10°C

ATTENTION: It is dangerous to measure differential pressure where the static pressure is higher than the transmitter’s

overpressure limit. In this case we recommend the use of Aplisens APR-2000 or PR-54 transmitters, which are resistant

to overloading by full static pressure of 4 MPa.
Hysteresis, repeatability

0.05%

Thermal compensation range

0 ÷ 70°C

Ambient temperature limit

-25 ÷ 80°C

Process temperature limit

-25 ÷ 95°C – direct measurement

Over 95°C – measurement through an impulse lines

ATTENTION: never allow the liquid to freeze in the impulse lines or in your installation close to the transmitter

We recommend the standard ranges: 40, 100, 250, 600 kPa; 1, 1.6, 2.5 MPa

-10...10, -100...100 kPa

Output signal 4 ÷ 20 mA, two-wire transmission
Error due to power supply variation 0.005% / V
Construction material of the pipe

stubs and isolating diaphragms

00H17N14M2 (316Lss)

Construction material of the case

0H18N9 (304ss)

Power supply

12 ÷ 30 V DC (Ex: to 28 V)

Load resistance R [

U

V] 12 V

0.02 A

sup

Ω

]

[

≤

−

Special features, certificates:

◊

Ex – spark-proof

◊

For other features phone us on: [phone]

Example

PR-28 / Ex / 0 ÷ 600 kPa / PK (cable 4.5 m)

: PR-28 Differential pressure transmitter / spark-proof / range 0 ÷ 600 kPa / electrical cable

connection, length of cable 4.5 m

1

2

3

4 ÷ 20 mA

e.g. Aplisens

ZL-24

+

–

Electrical diagram

Power

supply

Ordering procedure

PR-28 /___/__÷__/___

Special features:

Ex, others (description)

End of measurement range – in relation to 20 mA output

Type of electrical connection: PD, PK

Start of measurement range – in relation to 4 mA output