SDX Series
Low cost compensated pressure sensors in DIP package
GENERAL DISCUSSION
The SDX series devices give a voltage output which is directly
proportional to applied pressure. The gage devices will give
an increasing positive going output when increasing pressure
is applied to the pressure port. The absolute device will give a
decreasing output when increasing pressure is applied to the
port. The devices are ratiometric to the supply voltage and
changes in the supply voltage will cause proportional changes
in the offset voltage and full-scale span.
USER CALIBRATION
The SDX devices are fully calibrated for offset and span and
should therefore require little user adjustment in most appli-
cations. For more precise span and offset adjustments,
contact the factory.
VACUUM REFERENCE (absolute devices)
Absolute sensors have a hermetically sealed vacuum reference
chamber. The offset voltage on these units is therefore
measured at vacuum, 0 psia. Since all pressure is measured
relative to a vacuum reference, all changes in barometric
pressure or changes in altitude will cause changes in the
device output.
PNEUMATIC INTERFACE
The DIP also provides convenient mounting and pressure
ports for ease of use with standard 1/16" ID, 1/8" OD, 1/32"
wall, flexible plastic tubing for pressure connection.
The small tubing has several advantages over larger tubing
commonly used with pressure sensors:
1) The tubing can be formed in a much smaller radius without
kinking.
2) The tubing is easier to handle.
3) The tubing is available in a variety of colors such as clear,
white, yellow, blue, green, etc. to enable color coding of
pneumatic circuits with multiple pressure sensors in the
same way that wiring harnesses are color coded in electrical
circuits. This greatly simplifies troubleshooting.
4) Less stress is placed on the pressure sensor package
resulting in less potential for offset shift.
5) Less physical space is required for the small tubing.
6) The lower volume of air in the small tubing results in faster
pressure sensor response.
MEDIA COMPATIBILITY
SDX devices are compatible with most non-corrosive gases.
Because the circuitry is coated with a protective silicon gel,
many otherwise corrosive environments can be compatible
with the sensors. Fluids must generally be compatible with
silicon gel, plastic, RTV, silicon, and glass for use with the
gage devices (only). For questions concerning media compati-
bility, contact the factory.
MECHANICAL AND MOUNTING CONSIDERATIONS
The DIP housing is designed for convenient pressure
connection and easy PC board mounting. For pressure attach-
ment tygon and silicon tubing is recommended.
APPLICATION INFORMATION
The application information for the SCX series is also appli-
cable to the SDX series.
ORDERING INFORMATION
Operating
pressure
0 - 1 p si
0 - 5 p si
0 - 1 5 p si
0 - 3 0 p si
0 - 1 0 0 p si
S D X 15A 2
S D X 30A 2
S D X 100A 2
S D X 15A 4
S D X 30A 4
S D X 100A 4
Order number
Absolute devices
Gage devices
SDX01G2
SDX05G2
SDX15G2
SDX30G2
SDX100G2
Gage/differential
devices
S D X 01D 4
S D X 05D 4
S D X 15D 4
S D X 30D 4
S D X 100D 4
SenSym and Sensortechnics reserve the right to make changes to any products herein. SenSym and Sensortechnics do not assume any
liability arising out of the application or use of any product or circuit described herein, neither does it convey any license under its patent rights
nor the rights of others.
June 2008 / 062
4/4
www.sensortechnics.com
SENSORTECHNICS [ SENSORTECHNICS GMBH ]
