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
扑母Product description
The Smart Pressure Device SPD ries of pressure nsors are silicon bad and encapsulated in modified plastic Dual In Line packages, to accommodate six pins for through-board printed circuit mounting.
The nsors 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. Plea contact our sales department for more information.
Becau of it’s bridge resistance value, the SPD pressure nsor is
especially suited for u in combination with the Universal Transducer Interface (UTI03), which gives an easy and very accurate interface to a digital environment.
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SPD ries Performance Characteristic at Vcc =5V excitation @ 25 °C.
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).pretend
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The excitation of the nsor can be AC or DC. Specifications are given 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 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 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.
痕迹的近义词
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显卡接口类型
电视尺寸怎么算-4 –
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
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SPD005G 0 – 0.35 Bar (Gauge) SPD015G 0 – 1.0 Bar - SPD030G 0 – 2.0 Bar - SPD100G 0 – 6.5 Bar -
音频压缩SPD015A
0 – 1.0 Bar (Absolute)
Connection diagram (Top View)
pressure port ( ∅∅ 0.8)
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