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Your Swiss Pressure Sensing Specialist

Europe’s leading manufacturer of isolated pressure transducers and transmitters
Pressure ranges from 5 mbar to 2000 bar
High volumes at low prices, great flexibility, highest accuracies
Production of more than one million pressure transducers and transmitters per year
KELLER is certified according to ISO 9001:2008

KELLER AG für Druckmesstechnik, headquartered in Winterthur (Switzerland), is Europe’s leading manufacturer of isolated pressure transducers and transmitters. The company, which has a global workforce of around 400 employees, was founded in 1974 by Hannes W. Keller, a graduate in physics and the inventor of the integrated silicon measuring cell. The entire value creation, from production of the individual parts and calibration of the sensor through to the final inspection of the finished products, takes place at the headquarters in Winterthur. All KELLER AG products are therefore “Made in Switzerland”.

KELLER AG piezoresistive pressure sensors have impressively high precision and pressure ranges from 5 mbar to 2000 bar. In addition to more than 500 standard products, the company also develops and produces numerous customised solutions. Using state-of-the-art, automated manufacturing processes, large runs of industrial OEM transducers as well as special design versions in very small quantities are produced in more than 35 highly-specialised machining islands, resulting in more than one million pressure transducers and transmitters per year. The high quantities mean that we can keep prices low despite complex production processes and stringent quality requirements.

The KELLER AG product range includes digital manometers, level probes, data loggers, remote transmission units and pressure calibrators. Digital display equipment completes our wide range. The application areas for our pressure transducers are just as broad as our product range. For example, they regulate the internal cabin pressure in aircrafts, ensure the smooth switchover from natural gas to petrol in hybrid vehicles and are used as reference sensors in laboratory technology. KELLER special sensors, such as modular pressure catheters and other miniature transducers, are especially popular among researchers.

KELLER AG für Druckmesstechnik, including KELLER Ges. für Druckmesstechnik mbH Jestetten, is certified to ISO 9001:2008. The traceability of the measurement variables to national standards is therefore ensured.

PRD33Xe0 pages

نسخه متنی

Differential Pressure Transmitters

Series PRD-33 X

with high overload resistance and line pressure output
The Series PRD-33 X was developed for applications that require a high accuracy differential
pressure measurement together with high overload resistance in differential pressure ranges as
low as 350 mbar.
The Series PRD-33 X is the result of ongoing development of the KELLER PD-33 X differential
pressure transmitter. Thanks to a second integrated pressure sensor, the line, or common mode,
pressure can now be measured along with the differential pressure, resulting in several notable
features not found in traditional differential pressure transmitters.
For example, compensation for line pressure effect is now accomplished during factory
calibration. Moreover, both differential and line (absolute) pressure may be read by the user.
In addition, the PRD-33 X features high differential overload resistance; e.g., ± 35 bar with
a differential measuring range of only 350 mbar (100:1).
The internal differential pressure sensor element is isolated from the High (+) side media by a
compliant stainless steel diaphragm, while the Low (-) side media impinges directly on the back
side of the silicon measuring cell. Also isolated from the High (+) side media is the line (absolute)
pressure sensor. The floating sensor assembly guarantees maximum decoupling from external
mechanical forces.
Another notable feature of the Series PRD-33 X is the robust digital RS485 bi-directional
communication interface. Information such as serial number, pressure range, filter settings and
process values for both differential and line (absolute) pressures and their temperatures are
easily obtained.
This combination of features enables certain measurements not possible with traditional
differential pressure transmitters. For example, filling levels in liquefied gas storage tanks,
including oxygen, nitrogen, carbon dioxide and argon can now be measured safely, accurately
and at reasonable cost.
Features
- High-accuracy differential pressure measurement with compensated line pressure dependency
- Pressure- and temperature-compensated
- Independent line (absolute) pressure output
- High overload resistance
- RS485 communication interface
- Configurable via RS485 interface
- Compact structural design
Applications
- Level measurement of technical gases in liquefied gas tanks
- Differential pressure measurement in case of high unilateral overload resistance

Cable gland

Binder-plug

18,5 mm

M12-plug

18,5 mm

9,5 mm

PIN ASSIGNMENTS
Function

Binder
Serie 723

A-coded

GND

45,5 mm

Cable
white

M12*

n.c.

G1/4‘‘

blue

RS485B

yellow

Shielding

G1/4‘‘

black

RS485A
6-KT
SW32

red

Supply

ø 22

Thread

*t ompatible to CAN wiring components.
C
t Other pin assignments are possible

57 mm

Subject to alterations

KELLER AG für Druckmesstechnikt

KELLER Ges. für Druckmesstechnik mbHt
Companies approved to ISO 9001

11/2013

St. Gallerstrasse 119t

Schwarzwaldstrasse 17t

CH-8404 Winterthurt
D-79798 Jestettent

Tel. +41 (0)52 - 235 25 25t

Tel. +49 (0)7745 - 9214 - 0t

Fax +41 (0)52 - 235 25 00

Fax +49 (0)7745 - 9214 - 60
www.keller-druck.com

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اطلاعات تماس

PRD33Xe0 pages

تمام کاتالوگها و بروشورهای فنی شرکت KELLER

IRAN INDUSTRY EXPO

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