Barometric pressure sensor is used to measure the absolute gas pressure of the instrument, mainly for gas pressure related physical experiments, such as gas laws, but also in biological and chemical experiments measured dry, non-corrosive gas pressure. Air compressor pressure sensor The main sensing element is a sensitive to the pressure sensor within the thin film and a thimble open the circuit, it is connected to a flexible resistor. When the pressure of the gas under test is reduced or increased, the film deforms the thimble and the resistance of the resistor will change. The resistance of the resistor changes. Obtain 0-5V signal voltage from the sensor, after A / D conversion by the data collector to accept, and then the data collector to the appropriate form of the results sent to the computer.
一、SANICO pressure sensor structure
二、SANICO pressure sensor and other characteristics of the brand comparison:
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| Type | 2SMPB-02A | BMP280 | HSPPAD042A | ||
| Sensing Method | Piezo resistive | Piezo resistive | Piezo resistive | ||
| Size | 2.0×2.5×0.85mm | 2.0×2.5×0.95mm | 2.0×2.5×0.9mm | ||
| Pressure Range | 30～110kPa | 30～110kPa | 30～110kPa | ||
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Operating Voltage |
Min | 1.71 | 1.71V | 1.7V | |
| TYP | 1.8 | 1.8V | 1.8V | ||
| Max | 3.6 | 3.6V | 3.6V | ||
| Operating Temp. | -40～85℃ | -40～85℃ | -40～85℃ | ||
| Absolute Pressure Accuracy | ±100Pa | ±100Pa | ±70Pa | ||
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Average Current |
(Low Power) |
mode | High Speed | Ultra Low Power | Low Power Setting |
| Typ. | 4.1uA | 2.74uA | 1.8uA | ||
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Relative Pressure Accuracy |
(High resolution) |
mode | Ultra High Accuracy | － | － |
| Typ. | 3.9Pa | ±12Pa | ±5Pa | ||
| RMS Noise |
(High resolution) |
mode | Ultra High Accuracy | Ultra High resolution | High resolution setting |
| Typ. | 1.3Pa | 1.3Pa | 1.3Pa | ||
| Interface |
I2C(~400kHz)/ SPI(~400kHz) |
I2C(~3.4MHz)/ SPI(~10MHz) |
I2C 3.4MHz | ||
| DSP | × | × | × | ||
| ADC(bit) | 24bit | 20bit | 17bit | ||
