SDX SERIES
Low Cost Compensated Pressure Sensors in DIP Package
March 1998/062
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
GENERAL
DESCRIPTION
The SDX series sensors will provide a
very cost effective solution for pressure
applications that require small size plus
performance. These internally calibrated
and temperature compensated sensors
give an accurate and stable output over a
0°C to 50°C temperature range. This series
is intended for use with non-corrosive, non-
ionic working fluids such as air and dry
gases.
Devices are available to measure abso-
lute, differential and gage pressures from
1 psi (SDX01) up to 100 psi (SDX100). The
Absolute (A) devices have an internal
vacuum reference and an output voltage
proportional to absolute pressure.
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.
The SDX devices feature an integrated
circuit sensor element and laser trimmed
thick film ceramic housed in a compact sol-
vent resistant case. This package provides
excellent corrosion resistance andisolation
to external package stresses. The DIP
package also provides convenient mounting
and pressure ports for ease of use with
standard plastic tubing for pressure
connection.
All SDX devices are calibrated for span
to within 3.5% and provide an offset (zero
pressure output) of ±1 millivolt maximum.
These parts were designed for low cost
applications where the user can typically
provide fine-adjustment of zero and span
in external circuitry. For higher accuracies,
refer to the standard SCX series datasheet.
FEATURES
· 0 to 1 psi to 0 to 100 psi
· Low Cost DIP Package
· Temperature Compensation
· Calibrated Zero and Span
· Small Size
· Low Noise
· High Impedance for
Low Power Applications
APPLICATIONS
· Medical Equipment
· Computer Peripherals
· Pneumatic Controls
·HVAC
EQUIVALENT CIRCUIT ELECTRICAL CONNECTION
SDXxxxG2 SDXxxxA2 SDXxxxD4
Top View
Note: The polarity identicated is for pressure applied to
SDXxxxG2: P2 (backward gage)
SDXxxxA2: P1 (forward gage)
SDXxxxD4: P 2 (backward gage)
Scale: 1 cm
½ inch
SDX SERIES
Low Cost Compensated Pressure Sensors in DIP Package
March 1998/062
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
Specification Notes:
1: Reference Conditions: Unless otherwise noted: Supply Voltage, VS = 12 V DC, T A = 25°C,
Common-Mode Line Pressure = 0 psig, Pressure Applied to Port B. For absolute devices only , pressure is applied to Port A
and the output polarity is reversed.
2: Span is the algebraic difference between the output voltage at full-scale pressure and the output at zero pressure. Span is ratiometric to the supply voltage.
3: See Definition of T erms.
Hysteresis - the maximum output difference at any point within the operating pressure range for increasing and decreasing
pressure.
4: Maximum error band of the offset voltage and the error band of the span, relative to the 25°C reading.
5: Maximum difference in output at any pressure with the operating pressure range and temperature within
0°C to +50°C after: a) 100 temperature cycles, 0°C to + 50°C
b) 1.0 million pressure cycles, 0 psi to full-scale span
6: Input impedance is the impedance between pins 2 and 5
7: Output impedance is the impedance between pins 1 and 3.
8: This is the common-mode voltage of the output arms (Pins 1 and 3) for VS = 12 VDC.
9: Response time for a 0 psi to full-scale span pressure step change, 10% to 90% rise time.
10: Long term stability over a one year period.
11: Maximum pressure at any port is the maximum operating plus common-mode pressure which can be applied.
Part Number
SDX01...
SDX05...
SDX15A2
SDX15...
SDX30A2
SDX30...
SDX100A2
SDX100...
Operating Pressure
0 - 1 psig/d
0 - 5 psig/d
0 - 15 psia
0 - 15 psig/d
0 - 30 psia
0 - 30 psig/d
0 - 100 psia
0 - 100 psig/d
Proof Pressure11
20 psi
20 psi
30 psi
30 psi
60 psi
60 psi
150 psi
150 psi
Full-Scale Span
Characteristic
Zero Pressure Offset
Combined Linearity and Hysteresis(3)
Temperature Effect on Span (0-50°C)(4)
Temperature Effect on Offset (0-50°C)(4)
Repeatability(5)
Input Impedance(6)
Output Impedance (7)
Common-Mode Voltage(8)
Response Time (9)
Long Term Stability of Offset and Span(10)
Unit
mV
%FSO
%FSO
mV
%FSO
kΩ
kΩ
VDC
µsec
%FSO
Max.
+1.0
±1.0
±2.0
±1.0
±0.5
---
---
5.0
---
---
Typ.
0
±0.2
±0.4
±0.2
±0.2
4.0
4.0
3.0
100
±0.1
Min.
-1.0
---
---
---
---
---
---
1.5
---
---
STANDARD PRESSURE RANGES
* Maximum Pressure above which causes permanent sensor failure.
COMMON PERFORMANCE CHARACTERISTICS(1)
PRESSURE SENSOR CHARACTERISTICS (all devices)
Maximum Ratings
Supply Voltage VS+20 VDC
Maxium Pressure on any port 150 psig
Lead Temperature (soldering 4 sec.) 250°C
Environmental Specifications
Temperature Ranges
Compensated 0°C to 50°C
Operating -40°C to +85°C
Storage -55°C to +125°C
Humidity Limits 0 to 100% RH
Typ.
18 mV
60 mV
90 mV
90 mV
90 mV
90 mV
100 mV
100 mV
Min.
17.37 mV
57.9 mV
86.85 mV
86.85 mV
86.85 mV
86.85 mV
96.5 mV
96.5 mV
Max.
18.63 mV
62.1 mV
93.15 mV
93.15 mV
93.15 mV
93.15 mV
103.5 mV
103.5 mV
SDX SERIES
Low Cost Compensated Pressure Sensors in DIP Package
March 1998/062
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
PHYSICAL DIMENSIONS
SDXxxxG2/A2
Mass: 2 Grams Dimensions in inches (mm)
SDXxxxD4 Dimensions in inches (mm)
SDX SERIES
Low Cost Compensated Pressure Sensors in DIP Package
March 1998/062
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
gage devices
SDX01G2
SDX05G2
SDX15G2
SDX30G2
SDX100G2
Operating Pressure
0 - 1 psi
0 - 5 psi
0 - 15 psi
0 - 30 psi
0 - 100 psi
Part Number
absolute devices
---
---
SDX15A2
SDX30A2
SDX100A2
gage/differential devices
SDX01D4
SDX05D4
SDX15D4
SDX30D4
SDX100D4
ORDERING INFORMATION
USER CALIBRATION
The SDX devices are fully calibrated for offset and span and
should therefore require little user adjustment in most applications.
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.
MEDIA COMP A TIBILITY
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 compatibility, contact the factory.
MECHANICAL AND MOUNTING CONSIDERA TIONS
The DIP housing is designed for convenient pressure connection
and easy PC board mounting. For pressure attachment, tygon and
silicon tubing is recommended.
APPLICA TION INFORMA TION
The Application Information for the SCX Series is also applicable
to the SDX Serieseries.
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.
PNEUMA TIC 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.
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.
