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:

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
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
Average Current	(Low Power)	mode	High Speed	Ultra Low Power	Low Power Setting
		Typ.	4.1uA	2.74uA	1.8uA
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