EK-ED-EP-ER-ET-EC-EL Pressure Sensors
Measurement of gauge or absolute pressure
From 250 mbar to 600 bar full scale
Corrosion resistant
Excellent long term stability
Low cost - excellent performances / price ratio
The TRANSBAR
®
technology is a spin off of the «thick film technology» used worldwide
to produce so called «hybrid electronic circuits».
Patterns of conductive and resistive pasts, or «inks», are deposited on a substrate,
generally ceramics, using screen printing techniques.
The uniqueness of the «TRANSBAR
®
» technology is to use the piezoresistive charac-
teristics of specific resistive inks, i.e. the fact that their resistance values vary when
submitted to dimensional changes.
These resistors, called strain gauges, judiciously positionned on the deformable
structure (diaphragm), are connected together in a four arms Wheatstone bridge
configuration.
A regulated voltage source is connected to one diagonal of the bridge.
A pressure applied to the diaphragm will deform it and therefore unbalance the bridge,
resulting in an electrical signal, on the other diagonal of the bridge, proportional to
the applied pressure.
This low level signal, some mV., will have to be amplified to a suitable level to be connected to a display, controller, recorder, PLC or whatever required peripheric equipment.
Constructed entirely of ceramics (Al
2
0
3
, 96 %), comparable to a cristal, these sensors have a quasi perfect mechanical behaviour : good linearity, low hysteresis. They can
withstand tens of millions of cycles. Chemically inert, ceramics accepts most industrial media, even aggressive ones.
Their simple geometry allows their easy integration in OEM’s mechanical structures.
The field of their applications is very wide, from basic research to general industry.
Models
EK
(CS) :
ED
(CA) :
Open bridge, unbalanced.
Bridge impedance :15 kΩ +30%
Closed bridge, balanced.
The integrated bridge balancing circuitry eliminates
possible induced parasites due to connections to an
external circuit.
Closed bridge, balanced .
Interchangeability :
Output signal to ±1%
Closed bridge, balanced .
Thermal drifts compensation :
zero and output signal.
Closed bridge, balanced .
Thermal drifts compensation :
zero and output signal .
Output signal to ±1%
Interchangeability .
Electrical connections
1
+ Exc.
Supply
+ Signal
- Exc.
Supply
- Signal
+ Exc.
+ Supply
+ Signal
Exc.
- Supply
- Signal
EP
(CP) :
ER
(CTi) :
ET
(CT) :
EK11 / 21
(CS1 /2)
2
5
4
3
ED-EP 11 / 21
(CA - CP 1 / 2)
ER-ET 11 / 21
(CTi - CT 1 / 2)
ED71
(CA7)
1
5
4
3
1
+ Supply
+ Exc.
+ Signal
- Exc.
- Supply
- Signal
3
4
2
Other models, EC-EL with high level output signal, 0-10 V, or 0-5 V, or 4-20 mA:
consult us.
Sectionned wiew
Soldered contacts
Screen printed gauges
Ceramic diaphragm
www.baumer.com/process
Design and specifications subject to change without notice
Data sheet A12.20
Page 1
IVO [ BAUMER IVO GMBH & CO. KG ]
