ETC SPD015G

Specifications
SPD series
Version 1.0
SPD series Performance Characteristic at Vcc =5V excitation @ 25 ° C.
Parameter
Min
Typ
Max
Units.
Excitation Voltage
Excitation Current
Offset
0
0
-50
5
1.5
0
10
3.0
50
Volts
mA
mV
Temp Coeff Span
-27
-22
-17
%FS/100°°C
Temp Coeff Offset
Temp Coeff Resistance
-7
23
28
+7
33
%FS/100°°C
%FS/100°°C
Linearity
Hysteresis
-0.3
± 0.1
+0.3
0.15
%FS
% of Range
± 0.2
± 0.5
1
Repeatability )
Response time (10-90%)
1
Bridge resistance
Pressure overload
2.7
Operating temperature
Storage temperature
-20
-30
1
FSO
ms
3.3
4.0
1.35
KΩ
Bar
85
125
°C
°C
) measured after 1,000 temp. cycles 0 – 70 °C, 10 pressure cycles (10-90% FS)
6
Type Range (Bar) Min
Typ(FS)
Max
Unit
005G
015G
030G
100G
100
140
160
190
130
175
200
240
mV
mV
mV
mV
0000-
0.350
1
2
6.5
70
100
120
120
1 Pa = 0.145. 10 –3 PSI or 1 PSI = 6.89476*103 Pa
1 Bar = 10 5 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).
-2 –
SMARTEC BV, Delpratsingel 26
4811 AP Breda, The Netherlands
WWW.SMARTEC.NL
Tel: +31 76 5205353
Specifications
SPD series
Version 1.0
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.
-3 –
SMARTEC BV, Delpratsingel 26
4811 AP Breda, The Netherlands
WWW.SMARTEC.NL
Tel: +31 76 5205353
Specifications
SPD series
Version 1.0
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.
4 out +
6
12
5
5 exc
0.5C- ∅
∅3
4
R=1
pressure port ( ∅
∅ 0.8)
1 out -
4
2.8
14
8
6.8
2.54(2x)
vent hole
∅
∅ 0.8
1
2
3
2 exc
Gauge type sensor
Connection diagram
(Top View)
0.5
0.25
11±0.5
7
4
0.15±0.1
3.5
Atmospheric
Pressure inlet
@bottom
0.8±0.2
2.54
7
Absolute type sensor
1
All sizes in mm.
Wetted materials: glass, ryton, silicon, fluorosilicon
and gold
Other encapsulations on request.
Ordering information
Part no.
Pressure range
SPD005G
SPD015G
SPD030G
SPD100G
SPD015A
0 – 0.35 Bar (Gauge)
0 – 1.0 Bar
0 – 2.0 Bar 0 – 6.5 Bar 0 – 1.0 Bar (Absolute)
-4 –
SMARTEC BV, Delpratsingel 26
4811 AP Breda, The Netherlands
WWW.SMARTEC.NL
Tel: +31 76 5205353