Catalogue - Piezoresistive OEM Pressure Transducers - KELLER

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 realised. 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

Piezoresistive OEM Pressure Transducers - KELLER - #1

Wireless transmitter, Differential pressure transmitter, Digital manometer, Explosion proof pressure sensor, OEM sensor