Specifications Version 1.0
SPD series
-1
SMARTEC BV, Delpratsingel 26 WWW.SMARTEC.NL
4811 AP Breda, The Netherlands
Tel: +31 76 5205353 Tel: +31 76 5205353
Smartec Pressure Sensor
Features
* Commercial grade
* DIP version for high volume production
* Gauge or absolute pressure
* Resistive bridge technology
* Voltage or current excitation
Applications
* Medical applications
* Blood pressure
* Portable Gauges
* Process control
* HVAC controls
Product description
The Smart Pressure Device SPD series of pressure sensors are silicon
based and encapsulated in modified plastic Dual In Line packages, to
accommodate six pins for through-board printed circuit mounting.
The sensors come in two distinct types: Gauge and absolute. The
gauge type merely measures the pressure with respect to the
atmospheric pressure. The absolute type contains a reference vacuum
chamber, which is formed on the die during manufacturing.
The output voltages of both types are proportional to the pressure that
is measured.
Various pressure ranges are available. On request, other ranges and
encapsulations can be supplied. Please contact our sales department
for more information.
Because of it's bridge resistance value, the SPD pressure sensor is
especially suited for use in combination with the Universal Transducer
Interface (UTI03), which gives an easy and very accurate interface to a
digital environment.
Specifications Version 1.0
SPD series
-2
SMARTEC BV, Delpratsingel 26 WWW.SMARTEC.NL
4811 AP Breda, The Netherlands
Tel: +31 76 5205353 Tel: +31 76 5205353
SPD series Performance Characteristic at Vcc =5V excitation @ 25
C
.
Parameter
Min
Typ
Max
Units.
Excitation Voltage
0
5
10
Volts
Excitation Current
0
1.5
3.0
mA
Offset
-50
0
50
mV
Temp Coeff Span
-27
-22
-17
%FS/100
C
Temp Coeff Offset
-7
+7
%FS/100
C
Temp Coeff Resistance
23
28
33
%FS/100
C
Linearity
-0.3
0.1
+0.3
%FS
Hysteresis
0.15
% of Range
Repeatability
1
)
0.2
0.5
FSO
Response time (10-90%)
1
ms
Bridge resistance
2.7
3.3
4.0
K
Pressure overload
1.35
Bar
Operating temperature
-20
85
C
Storage temperature
-30
125
C
1
) measured after 1,000 temp. cycles 0 70
C, 10
6
pressure cycles (10-90% FS)
Type Range (Bar) Min
Typ(FS)
Max
Unit
005G
0 - 0.350
70
100
130
mV
015G
0 - 1
100
140
175
mV
030G
0 - 2
120
160
200
mV
100G
0 - 6.5
120
190
240
mV
1 Pa = 0.145. 10
3
PSI or 1 PSI = 6.89476*10
3
Pa
1 Bar = 10
5
Pa = 10
5
N/m
2
Understanding the specifications
The available range of SPD series pressure sensors allows for a wide
range of applications. In order to get good results, it is very important to
fully understand the meaning of the various specifications and their
effects on accuracy, especially the ones that deal with temperature
coefficients. (Silicon resistors are very temperature dependent).
Specifications Version 1.0
SPD series
-3
SMARTEC BV, Delpratsingel 26 WWW.SMARTEC.NL
4811 AP Breda, The Netherlands
Tel: +31 76 5205353 Tel: +31 76 5205353
Excitation voltage
The excitation of the sensor can be AC or DC. Specifications are given
with a DC excitation of 5V. In order to avoid electrical breakdown it is
advised not to exceed the maximum values given.
Offset
The offset value is the electrical output voltage (imbalance) of the
pressure sensor when zero pressure is applied. The offset value for the
absolute type is determined by extrapolating the measured values at
two different pressures (atmospheric air and 0.05 Bar). The pressure in
reference chamber is about 25 mTorr (3.33 Pa).
Temperature coefficients
Silicon resistors are very temperature dependent. The overall drift of the
resistors is not of interest to most users (The bridge resistors are
located on the same die). The temperature coefficients of the offset and
span, however, are very important. All the temperature coefficients are
given in percentage of full-scale range (FS) and over a temperature
range of 100
C.
The maximum value of the temperature coefficient of the span is minus
27%, which means that worst case the span becomes 27% smaller
over the full temperature range of 100
C. The offset will vary no more
than
7% of the span over the same temperature range.
Calculation example (please refer to the parameter table above)
Suppose the use of a pressure sensor of type SPD 015G over a
temperature range of 100
C. The typical full scale span is 140 mV. The
offset (at a fixed temperature) will be between -50 and +50 mV.
Offset
When the static part of the offset has been nulled, the offset can still
vary
7% of 140 mV (
9.8 mV), over the temperature range of 100
C.
Span
The typical full-scale span is 140 mV and the typical temperature
coefficient of the span equals 22 %FS/100
C.
Typically, you would therefore have a span, which varies between 140
mV and 109 mV (140 mV minus 22%), over the full temperature range
of 100
C.
Specifications Version 1.0
SPD series
-4
SMARTEC BV, Delpratsingel 26 WWW.SMARTEC.NL
4811 AP Breda, The Netherlands
Tel: +31 76 5205353 Tel: +31 76 5205353
In the worst case scenario the minimum value of the span is 100 mV,
which means that the sensor has a span of 100 mV, which could drop
to 63mV (100 minus 27%) over the full temperature range of 100
C.
Linearity
The linearity is defined as the maximum deviation from the best fitted
straight line.
Outline drawings and dimensions.
Other encapsulations on request.
Ordering information
Part no.
Pressure range
SPD005G
0 0.35 Bar (Gauge)
SPD015G
0 1.0 Bar -
SPD030G
0 2.0 Bar -
SPD100G
0 6.5 Bar -
SPD015A
0 1.0 Bar (Absolute)
Connection diagram
(Top View)
pressure port (
0.8)
1 2 3
12
14
vent hole
0.8
6 5 4
2.54(2x)
R=1
2.8
6.8
0.5C-
3
8
4
All sizes in mm.
Wetted materials: glass, ryton, silicon, fluorosilicon
and gold
4 out
+
5 exc
1 out
-
2 exc
0.5
2.54
3.5
Gauge type sensor
Absolute type sensor
0.25
0
.150.1
110.5
0.80.2
Atmospheric
Pressure inlet
@bottom
7
7
1
4
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