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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.

Piezoresistive OEM Pressure Transducers0 pages

نسخه متنی

KELLER

Piezoresistive OEM Pressure Transducers

WITH LASER WELDED MEDIA ISOLATION DIAPHRAGM

Series 3 L to 10 L

Series 3L...10L, a new range of transducers that benefit from smaller capsule dimensions and crevice free diaphragms. KELLER has developed a new technique for laser welding very thin stainless steel media isolation diaphragms. The smaller crevice free transducers still retain all the traditional performance, stability, and quality, for which KELLER is renowned.

Each transducer is supplied with a calibration sheet indicating sensitivity, linearity, zero offset, temperature errors and the compensation resistors to substantially reduce zero offset and zero temperature errors.

The transducers are designed for floating O-ring seal mounting, this avoids housing induced stress, and guarantees the performance over pressure and temperature as tested in our automatic test chambers. Each transducer comprises of a piezoresistive silicon chip mounted on a glass-metal feed-through header welded into a stainless steel housing and filled with silicone oil, the very thin laser welded stainless steel isolation diaphragm completes the front side. Media pressure is transferred from the stainless steel isolation diaphragm, via the oil inside the cell, to the silicon measuring chip.

With the laser welded technology, transducers having diameters as low as 9,5 mm can be reaͭlised. Diameter is to some extent dependent upon the pressure range measured, low pressures require larger diameters, higher pressures can be achieved with smaller diameters. This is due to the expansion of the oil under temperature that creates an internal pressure due to the resistance of the diaphragm. The smaller the diameter, the higher the internal pressure and the more difficult is the zero compensation.

c a e

3 L / 4 L / 5 L

6 L

7 L

PD-9 L

8 L

The list below shows the dimensions of the standard types of the Series L transducers and the pressure ranges, in which they meet the specifications on the reverse of this leaflet.

The higher length for high pressure transducers is given by the required thickness of the glass feedthrough to withstand the pressures.

PD-10 L

Dimensions	Ranges
Typ	(mm)	(bar)	Version
3 L	0 9,5 x 4,2	20...200	abs.
4 L	0 11 x 4,2	10...200	abs.
5 L	0 12 x 4,5	10...200	abs.
6 L	0 13 x 4,5	50...200	abs.
6 L HP	0 13 x 8	200...1200	abs.
7 L	0 15 x 5	10...200	abs. / gauge (<50 bar)
7 L HP	0 15 x 8	200...1000	abs.
8 L	0 17 x 7	0,2...200	abs. / gauge (<50 bar)
9 L	0 19 x 5	0,2...200	abs. / gauge (<50 bar)
PD-9 L	0 19 x 15	0,1...50	diff. / wet wet
10 L	0 19 x 15	0,1...100	abs. / gauge
10 L HP	0 19 x 15	200...1000	abs.
PD-10 L	0 19 x 26	0,1...50	diff. / wet wet

Housing Diaphragm Oil Ceramic Laser Weld

Measuring Cell Glass Feedthrough

Subject to alterations

02/2009

KELLER AG fur Druckmesstechnik KELLER Ges. fur Druckmesstechnik mbH

St. Gallerstrasse 119 Schwarzwaldstrasse 17

CH-8404 Winterthur D-79798 Jestetten

Tel. +41 (0)52 - 235 25 25 Tel. +49 (0)7745 - 9214 - 0

Fax +41 (0)52 - 235 25 00 Fax +49 (0)7745 - 9214 - 60

Companies approved to ISO 9001

www.keller-druck.com

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Piezoresistive OEM Pressure Transducers0 pages

تمام کاتالوگها و بروشورهای فنی شرکت KELLER

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