March 1998/053
SCX - Series
Precision Compensated Pressure Sensors
Aubinger Weg 27, 82178 Puchheim, Germany
Phone 0049 - (0) 89 80 08 30, Fax 0049 - (0) 89 8 00 83 33
http://www.sensortechnics.com
FEATURES
· 0 - 1 psi to 0 - 150 psi
· Precision Temperature
Compensation
· Calibrated Zero and Span
· Small Size
· Low Noise
· High Accuracy
· High Impedance for
Low Power Applications
APPLICATIONS
· Medical Equipment
· Barometry
· Computer Peripherals
· Pneumatic Control
·HVAC
EQUIVALENT CIRCUIT
GENERAL DESCRIPTION
The SCX series sensors will provide a
very cost effective solution for pressure
applications that require high accuracy over
a wide temperature range. These internally
calibrated and temperature compensated
sensors were specifically designed to
provide an accurate and stable output over
a 0°C to 70°C temperature range. This series
is intended for use with non-corrosive, non-
ionic working fluids such as air, dry gases,
and the like.
Devices are available to measure abso-
lute, differential, and gage pressures from
1psi (SCX01) up to 150psi (SCX150). The
Absolute (A) devices have an internal
vacuum reference and an output voltage
proportional to absolute pressure. The Dif-
ferential (D) devices allow application of
pressure to either side of the pressure sen-
sing diaphragm and can be used for gage
or differential pressure measurements.
The SCX devices feature an integrated
circuit sensor element and laser trimmed
thick film ceramic housed in a compact nylon
case. This package provides excellent
corrosion resistance and provides isolation
to external package stresses. The package
has convenient mounting holes and pres-
sure ports for ease of use with standard
plastic tubing for pressure connection.
All SCX devices are calibrated for span
to within ±1% and provide a very low zero
pressure output of
±300 microvolts
maximum. Thus, for many applications,no
trimming networks are required in the signal
conditioning circuitry. If the application
requires extended temperature range ope-
ration, beyond 0 to 70°C, two pins which
provide an output voltage proportional to
temperature are available for use with
external circuitry.
The output of the bridge is ratiometric to
the supply voltage and operation from any
D.C. supply voltage up to +30 V is
acceptable.
Because these devices have very low
noise
and
excellent
temperature
compensation, they are ideal for medical
and other high performance applications.
The 100 microsecond response time also
makes this series an excellent choice for
computer peripherals and pneumatic control
applications.
ELECTRICAL CONNECTION
Pin 1)
Temperature Output (+)
Pin 2)
V
S
Pin 3)
Output (+)
Pin 4)
Ground
Pin 5)
Output (-)
Pin 6)
Temperature Output (-)
Note:
The polarity indicated is for pressure applied to port B. (For absolute devices
pressure is applied to port A and the output polarity is reversed.)
Scale:
1cm
½ inch
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