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 Perf ormance 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 KΩ
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, 106 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*103 Pa
1 Bar = 105 Pa = 105 N/m2
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
0.15±0.1
11±0.5
0.8±0.2
Atmospheric
Pressure inlet
@bottom
7
7
1
4
