气压传感器是用于测量气体的绝对压强的仪器，主要适用于与气体压强相关的物理实验，如气体定律等，也可以在生物和化学实验中测量干燥、无腐蚀性的气体压强。空气压缩机的气压传感器主要的传感元件是一个对气压传感器内的强弱敏感的薄膜和一个顶针开控制，电路方面它连接了一个柔性电阻器。当被测气体的压力降低或升高时，这个薄膜变形带动顶针，同时该电阻器的阻值将会改变。电阻器的阻值发生变化。从传感元件取得0-5V的信号电压，经过A/D转换由数据采集器接受，然后数据采集器以适当的形式把结果传送给计算机。
一、SANICO气压传感器结构
二、SANICO气压传感器与其他品牌的特性比较：
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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 | ||
