SPD ries Performance Characteristic at Vcc =5V excitation @ 25 °C.
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1) measured after 1,000 temp. cycles 0 – 70 °C, 106 pressure cycles (10-90% FS)
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 ries pressure nsors 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).
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The excitation of the nsor can be AC or DC. Specifications are given
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with a DC excitation of 5V. In order to avoid electrical breakdown it is
advid not to exceed the maximum values given.
Offt
The offt value is the electrical output voltage (imbalance) of the
pressure nsor when zero pressure is applied. The offt value for the
absolute type is determined by extrapolating the measured values at
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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 urs (The bridge resistors are
located on the same die). The temperature coefficients of the offt and宴石寺
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 ca the span becomes 27% smaller
over the full temperature range of 100 °C. The offt will vary no more
than ±7% of the span over the same temperature range.
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Calculation example (plea refer to the parameter table above)
Suppo the u of a pressure nsor of type SPD 015G over a
temperature range of 100 °C. The typical full scale span is 140 mV. The
offt (at a fixed temperature) will be between -50 and +50 mV.
Offt
When the static part of the offt has been nulled, the offt 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.
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4811 AP Breda, The Netherlands Tel: +31 76 5205353
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SMARTEC BV, Delpratsingel 26 WWW.SMARTEC.NL 4811 AP Breda, The Netherlands Tel: +31 76 5205353
In the worst ca scenario the minimum value of the span is 100 mV, which means that the nsor 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)
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