SCX...C Series
Low cost compensated pressure sensors
FEATURES
· 0...1 to 0...150 psi
· Low cost
· Precision temperature
compensation
· Calibrated zero and span
· Small size
· Low noise
· High impedance for
low power applications
GENERAL DESCRIPTION
The SCX...C series sensors will provide a
very cost effective solution for pressure
applications that require operation over a
wide temperature range. These internally
calibrated and temperature compensated
sensors give an accurate and stable output
over a 0°C to 70°C temperature range. This
series is intended for use with non-corro-
sive, non-ionic working fluids such as air,
dry gases, and the like.
Devices are available to measure absolute,
differential, and gage pressures from 1 psi
(SCX01) up to 150 psi (SCX150). The ab-
solute (A) devices have an internal vacuum
reference and an output voltage proportio-
nal to absolute pressure. The differential
(D) devices allow application of pressure
to either side of the pressure sensing
diaphragm and can be used for gage or
differential pressure measurements.
The SCX devices feature an integrated cir-
cuit 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 ±5 % and provide an offset (zero
pressure output) of ±1 mV maximum. These
parts were designed for low cost applica-
tions where the user can typically provide
fine adjustment of zero and span in extenal
Scale:
1 cm
�½ inch
APPLICATIONS
· Medical Equipment
· Computer Peripherals
· Pneumatic Control
· HVAC
circuitry. For higher accuracies, refer to
the standard SCX series datasheet. If the
application requires extended temperature
range operation, beyond 0 to 70°C, two
pins which provide an output voltage pro-
portional 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 +20 V is acceptable.
Because these devices have very low
noise and 100 microsecond response time
they are an excellent choice for medical
equipment, computer peripherals, and
pneumatic control applications.
EQUIVALENT CIRCUIT
2
Vs
ELECTRICAL CONNECTION
1
+
-
1 2 3 4 5 6
Pin
Pin
Pin
Pin
Pin
Pin
1)
2)
3)
4)
5)
6)
Temperature output (+)
V
S
Output (+)
Ground
Output (-)
Temperature output (-)
3
5
Bottom view
6
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.)
4
August 2005 / 060
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