SDX...A Series
Precision compensated pressure sensors in DIP package
FEATURES
· 0...1 to 0...100 psi
· DIP package
· Temperature compensated
· Calibrated zero and span
· Small size
· Low noise
· High impedance for
low power applications
GENERAL DESCRIPTION
The SDX series sensors will provide a very
cost effective solution for pressure appli-
cations that require small size plus per-
formance. These calibrated and temperature
compensated sensors give an accurate and
stable output over a 0 to 50°C temperature
range. SDX devices are available in standard
commercial and prime grades to allow optimi-
zation of accuracy and cost in any given appli-
cation. 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 absolute
and gage pressures from 1 up to 100 psi.
The absolute 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 solvent resis-
tant case.
The package is a double wide (i.e., 0.600"
lead spacing) dual-inline-package. This is the
same familiar package used by IC manu-
facturers except it is only 0.470" long and
Scale:
1 cm
½ inch
APPLICATIONS
· Medical equipment
· Computer peripherals
· Pneumatic controls
· HVAC
has a pressure port(s). The PC board area
used by each DIP is approximately 0.26
square inches. This extremely small size
enables the use of multiple sensors in limited
available space. The DIP provides excellent
corrosion resistance and isolation to external
package stress.
The DIP mounts on a PC board like a standard
IC with through-hole pins. The pins anchor
the pressure sensor to the PC board and pro-
vide a more secure and stable unit than other
types of packages.
EQUIVALENT CIRCUIT
ELECTRICAL CONNECTION
TOP VIEWS
Vs
+Vs
Pin 1 identified by
chamfered corner
P2
1 out +
GND
4
out -
Vent hole
out -
GND
out +
Pin 1 identified by
chamfered corner
1
P1
+Vs
4
out + 1
GND
out -
P1
P2
4
+Vs
SDX...G2-A
SDX...A2-A
SDX...D4-A
+
-
Note:
The polarity identicated is
SDX...G2-A:
P2
SDX...A2-A:
P1
SDX...D4-A:
P2
for pressure applied to
(backward gage)
(forward gage)
(backward gage)
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SDX...A Series
Precision compensated pressure sensors in DIP package
PRESSURE SENSOR CHARACTERISTICS (all devices)
Maximum ratings
Supply voltage V
S
Maxium pressure on any port
Lead temperature (soldering 4 sec.)
+20 V
DC
150 psig
250°C
Environmental specifications
Temperature ranges
Compensated
Operating
Storage
Humidity limits
0 to 50°C
-40 to +85°C
-55 to +125°C
0 to 100% RH
STANDARD PRESSURE RANGES
Part number
SDX01...
SDX05...
SDX15...
SDX30...
SDX100...
Operating
pressure
0 - 1 psi
0 - 5 psi
0 - 15 psi
0 - 30 psi
0 - 100 psi
Proof
11
pressure
20 psi
20 psi
30 psi
60 psi
150 psi
Min.
17.82
59.40
89.10
89.10
99.00
mV
mV
mV
mV
mV
Full scale span
1,2
Typ.
18.0 mV
60.0 mV
90.0 mV
90.0 mV
100.0 mV
Max.
18.18 mV
60.60 mV
90.90 mV
90.90 mV
101.00 mV
COMMON PERFORMANCE CHARACTERISTICS
1
Characteristics
Zero pressure offset
Combined linearity and hysteresis
3
Temperature effects (0 to 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
1.5
Min.
-0.300
Offset
Span
Typ.
0
±0.1
±0.2
±0.4
±0.2
4.0
4.0
3.0
100
±0.1
Max.
+0.300
±0.25
±0.5
±1.0
±0.5
Unit
mV
%FSO
mV
%FSO
kΩ
5.0
V
DC
µ se c
mV
Specification notes:
1.
Reference conditions (unless otherwise noted): supply voltage, V
S
= 12V
DC
; T
A
= 25°C; common mode line pressure = 0 psig;
pressure applied to port 2. For absolute devices only, pressure is applied to port 1 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.
Hysteresis is the maximum output difference at any point within the operating pressure range for increasing and decreasing
pressure. Maximum linearity & hysteresis for the SDX05 is 0.5 %FSO.
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 within the operating pressure range and temperature within 0 to +50°C after:
a) 100 temperature cycles, 0 to +50°C.
b) 1.0 million pressure cycles, 0 psi to full scale span.
6.
Input impedance is the impedance between V
S
and ground.
7.
Output impedance is the impedance between + and - outputs.
8.
This is the common mode voltage of the output arms for V
S
= 12 V
DC
.
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.
If the maximum pressure is exceeded, even momentarily, the package may leak or burst, or the pressure sensing die may fracture.
The proof pressure for the forward gage of all devices in the D4-package is the specified value or 100 psi, whatever is less.
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SDX...A Series
Precision compensated pressure sensors in DIP package
PHYSICAL DIMENSIONS
SDX...G2-A,
SDX...A2-A
0.470
(11.94)
0.550
(13.97)
0.105
(2.67)
0.315
(8.00) typ.
0.280
(7.11) typ.
compensation
circuit
0.600
(15.24) typ.
0.01
(0.25)
0.190
(4.83) typ.
0.020
(0.51) typ.
0.100
(2.54) typ.
0.110
(2.79) typ.
mass:
2 g
dimensions in inches (mm)
SDX...D4-A
1
P1
4
P2
0.470
(11.94)
0.550
(13.97)
Ø 0.090
(2.29) typ.
0.135
(3.43)
0.250
(6.35)
0.300
(7.62)
0.430
0.335 (10.92) typ.
(8.50) typ.
compensation
circuit
0.600
(15.24) typ.
0.120
(3.05) typ.
0.010
(0.25) typ.
0.020
(0.51) typ.
0.100
(2.54) typ.
0.110
(2.79) typ.
mass:
2 g
dimensions in inches (mm)
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SDX...A Series
Precision 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 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.
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 compatibility, contact the factory.
MECHANICAL AND MOUNTING
CONSIDERATIONS
The DIP housing is designed for convenient pressure
connection and easy PC board mounting. For pressure
attachment, tygon and silicon tubing is recommended.
APPLICATION INFORMATION
The application information for the SCX series is also
applicable to the SDX series.
ORDERING INFORMATION
Pressure range
0 - 1 p si
0 - 5 p si
0 - 1 5 p si
0 - 3 0 p si
0 - 1 0 0 p si
SDX15A2-A
SDX30A2-A
SDX100A2-A
Absolute
Order number
Gage
SDX01G2-A
SDX05G2-A
SDX15G2-A
SDX30G2-A
SDX100G2-A
Differential/Gage
SDX01D4-A
SDX05D4-A
SDX15D4-A
SDX30D4-A
SDX100D4-A
All devices are marked with SDX...A2 or SDX...G2 or SDX...D4 and a golden color dot.
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.
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