KELLER
P
IEZORESISTIVE
T
RANSMITTERS AND
T
RANSDUCERS
I
NDUSTRIAL
A
PPLICATIONS
. A
BSOLUTE AND
G
AUGE
R
EFERENCES
.
This new range of KELLER OEM pressure transmitters and transducers offers the user the
high accuracy and stability of the KELLER piezoresistive pressure capsule in a low cost OEM
package. Applications include refridgeration, hydraulic controls, air compressors, ink jet printers,
vacuum pumps etc.
The silicon sensor is mounted in an all welded oil filled stainless steel capsule, providing a
highly stable measuring cell with negligible hysteresis, unrivalled linearity, high output and a
life of millions of pressure cycles.
The Series 21R use the Series 6 capsule, which is of all welded 316L stainless steel construc-
tion. Transducers are supplied with 2 metres of screened cable, or a square connector and
mating plug, type mPm-193.
Accuracy is achieved by very large scale predictable production quantities of the pressure
capsule (over 2 million produced today).
Reliability is assured by the inherent properties of the perfectly elastic silicon chip, and ensuring
that neither the pressure media nor the reference media (in the gauge version) come into
contact with any sensitive parts.
Temperature Compensation: Each unit is fully tested and compensated. Span errors are
reduced by selecting the semiconductor doping levels so that the gauge factor of the strain
gauges (鈭哛) is constant with temperature. Thermal zero compensation is achieved by an
automatic test procedure which fits a single resistor across one arm of the bridge.
Shock and vibration performance is excellent due to the silicon chip being suspended in the
oil-filled capsule. It is isolated mechanically from the body. Similarly, the effects of mounting
torque are eliminated.
S
ERIES
21 R
S
ERIES
21R
WITH
C
ABLE
(P
LAN
80096.2)
G 1/4"
酶 17
E
LECTRICAL
C
ONNECTIONS
2-W
IRE
GREEN
WHITE
3-W
IRE
GND
4-W
IRE
GND (
WHITE
)
+OUT (
RED
)
+V
CC
(
BLACK
)
-OUT (
BLUE
)
OUT/GND
+V
CC
+OUT
+V
CC
酶 18,6
HEX 19
~ 50
Cable Connection
BROWN
S
ERIES
21R
WITH
P
LUG
(P
LAN
80096.3)
G 1/4"
HEX 19
mPm-Connector
(Contact Spacing 9,4 mm)
2-W
IRE
1
2
3
4
OUT/GND
+V
CC
3-W
IRE
GND
+OUT
+V
CC
4-W
IRE
GND
+OUT
+V
CC
-OUT
酶 17
12
8
~ 56
Subject to alterations
4/99
KELLER AG f眉r Druckmesstechnik
KELLER
Gesellschaft f眉r druckmesstechnik mbH
Companies approved to ISO 9001 / EN 29001
St. Gallerstrasse 119
Schwarzwaldstrasse 17
CH-8404 Winterthur
D-79798 Jestetten
Tel. 052 - 235 25 25
Tel. 07745 - 9214 - 0
Fax 052 - 235 25 00
Fax 07745 - 9214 - 50
Internet: http://www.keller-druck.ch
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