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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.

Series 4 LD?9 LD0 pages

نسخه متنی

Piezoresistive OEM Pressure Transmitters

Series 4 LD…9 LD

with i2c interface and embedded signal conditioning

With the D-line, Keller introduces a unique combination consisting of an exceedingly robust
industrial pressure transducer and the popular I2C microcontroller interface. Pressure transmitters with this interface are commonly available only in consumer market housings made of
plastic or ceramic, where merely the parameters for compensation are stored in an integrated
memory. The D-line OEM transmitters however have an unprecedented embedded digital signal
processing (DSP) core for the compensation and normalization of the output values.

4 LD

Technology
The Series 4 LD...9 LD is based on KELLER’s famous Chip-In-Oil (CIO) technology. The “L”
stands for the laser welded stainless steel housing and could equally be representative for lowpower (typ. 0,1 µA in idle/sleep mode) and low-voltage (Supply: 1,8...3,6 VDC). The housing is
hermetically-sealed, oil-filled and builds a Faraday cage with feed-through capacitors around the
entire electronics. The digital interface of the electronics with dual information of pressure and
temperature is indicated by the “D”.

7 LD

Interface
The easiest way to couple an OEM pressure transmitter to a microcontroller based system is a
digital I/O-compatible interface; no amplification, no analog to digital conversion, no calibration,
no temperature coefficients. In short: no problems.
I2C (Inter-Integrated Circuit) is designed for a direct connection between devices on a printed circuit board. It is a BUS-system because it allows the connection of multiple transmitters
(slaves) to the same communication lines, but it is not a fieldbus with the classic long distance
inter-connectability. So the D-Line combines an industrial pressure interface for harsh environment with an electrical interface for OEM applications.
The values are in 16 Bit unsigned integer format and the scaling is given by constants or by the
memory content of the transmitter (two floating point values IEEE 754 for the pressure scaling).

9 LD

9 FLD

Performance features
• Ultra low power consumption, optimised for battery powered applications
• Hermetically protected sensor electronics – extremely resistant to environmental influences
• Ultra-compact, robust housing made from stainless steel (optional Hastelloy C-276)
• No external electronics for compensation or signal processing
• Extremely accurate, outstanding long-term stability, no hysteresis
• Pressure ranges of 1 bar to 1000 bar
• Easy to integrate into microcontroller based systems
• Internal two-chip solution with pressure sensor and signal processing separation provides a
high degree of flexibility
Series 4 LD

Series 7 LD
Ø 15

I2C is a trademark of NXP

Series 9 LD

Ø 11

6 LD HP / 7 LD HP
(high pressure)

Ø 19

4,2

Connection

5
0,5
4±0,5

1
4 ±0,5

0,5

Ø 5,08

5
4±0,5

EOC

GND

SDA

SCL
SUP

Series 9 FLD

Series 6 LD HP

Ø 17 / Ø 21

Ø 13

(supply)

Series 7 LD HP
Ø 15

Label
8

For proper handling please check our
installation instructions on our product
specific web page.

1,8…3,6 V

GND

I2C Clock

SDA

I2C Data

EOC

0,5
4±0,5

Description

SUP

SCL

End of Conversion

Subject to alterations

KELLER AG für Druckmesstechnikt

KELLER Ges. für Druckmesstechnik mbHt
Companies approved to ISO 9001

Wire

11/2014

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

Series 4 LD?9 LD0 pages

تمام کاتالوگها و بروشورهای فنی شرکت KELLER

IRAN INDUSTRY EXPO

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