AP681
Piezoresistive pressure sensor
The sensors of the series AP681 ff are piezoresistive pressure sensors based on ceramic. The
measuring bridge is printed directly on one side of the ceramic diaphragm by means of thick film
technology. The rear part of the diaphragm can be exposed directly to the medium to be
measured. Because of the excellent chemical resistance no additional protection is normally
required.
Thanks to the reinforced outer area (monolithic structure) the sensor can be mounted directly in a
case by using an o-ring or else it can be mounted to a metal fitting.
The sensors are designed in such a way so that temperature changes and overloading do not
cause any loss in reliability. The use of ceramic ensures high linearity across the entire range of
measurement and reduces effects of hysteresis to minimum.
The AP681 sensors are thermal compensated by laser adjustable PTC resistors. The zero point
can be adjusted on customer specifications.
Compensated sensors
Design according to customer’s specification
Wide range of temperature
Easy mounting
High linearity
AP681
Technical data
Pressure ranges
Range (bar) 1 2 5 10 20 50 100 200 400
Overloading (bar) 3 7 12 25 50 120 250 400 600
Thickness (mm)±0.02 6.35 6.35 6.35 6.35 6.35 6.35 6.35 6.35 6.35
Typical sensitivity (mv /v) 2.0…3.5 2.0…3.4 2.0…3.5 2.7…4.0 3.0…4.2 2.7…4.0 2.1…3.1 1.8…3.3 1.4…2.9
Supply voltage 5…30 VDC stabilized
Bridge resistance 11±20% k
Zero point (tolerance) ±0.1 mV/V @ 25
Linearity, hysteresis and repeatability 0.2…1.5 %FS terminal based
Depending pressure range
Stability 0.3 %FS/y @25
Operating temperature range -40…+135
Thermal span shift -0.010 %FS/K typ. 0….70
-0.012 %FS/K typ. –25…0/70…85
-0.014 %FS/K typ. –40…-25/85…135
Thermal zero shift ±0.02 %FS/K
±0.01 %FS/K (on request)
Material Ceramic AL2O3
Dimensions ф18.0 6.35mm
Electrical connection Pins (other on request)
All data are based on a reference temperature or 25 .
Other pressure and temperature ranges on request.
AP681…………………………………
Option 1: pressure range
0.1 bar…………………….001
0.2 bar…………………….002
0.5 bar…………………….005
0.10 bar…………………….010
0.20 bar…………………….020
0.50 bar…………………….050
0.100 bar…………………….100
0.200 bar ……………………200
0.400 bar…………………….500
others on request (*) 999
Option 2:offset adjustment
0mV/V+/- 0.2mV/V……………………………………. 0
others on request(*)…………………………………… 9
Option 3:sensitivtity adjustment
Without………………………………………………………. 0
With on request………………………………………………………..9
Option 4:TC-Zero adjustment
TK-0 +/-0.02%FS/K………………………………………………………………. 1
TK-0 +/-0.01%FS/K………………………………………………………………. 2
Others on request (*)…………………………………………………………………9
Option 5:linearity, hyseresis , repeatability
+/-0.2…1.5%FS…………………………………………………………………………………….. 0
selected on request(*)………………………………………………………………………………… 9
Option 6:electrical connection
4 pins (2.54mm pitch)………………………………………………………………………………………………….01
4 pretinned soldering pads (2.54mm pitch)………………………………………………………………………………………02
Flexprint NOMEX 50.8 mm –4 polog/4pins………………………………………………………………………………………04
Ribbon cable 50.8mm –4 pins………………………………………………………………………………………. 05
Tin only on Lo (-)………………………………………………………………………………………..20
Tin only on S (+)……………………………………………………………………………………. 21
Others on request (*)………………………………………………………………………………… … ... 99
Option 7:additional coating
Without……………………………………………………………………………………………………………………………………01
Parylene…………………………………………………………………………………………………………………………………..02
Others on request (*)………………………………………………………………………………………………………………………… 99
