MEMS Formaldehyde sensor (HCHO)

Introduction

The S1001 formaldehyde gas sensor is a semiconductor gas sensor developed based on MEMS technology and can be used to detect the formaldehyde gas content in different scenarios. In addition to the sensor design, the company also provides complete gas sensor modules including integrated circuits

Characteristic

Using MEMS technology, semiconductor materials, good sensitivity, resolution and accuracy for formaldehyde, can detect 40ppb formaldehyde, small size, low power consumption, high sensitivity, fast response recovery, simple drive circuit, good stability, long life, The structure is strong and the shock resistance is good.

Main application

Widely  used  in air  purifiers, fresh air  conditioners, smart wearables,  portable detectors.

Technical Parameters

Pin Assignment & Reference Circuit

Note: The picture above shows the basic test circuit of the S1001 sensor. The sensor needs to apply 2 voltages: heater voltage (V h) and test voltage (Vcc). Among them, Vh is used to provide a specific working voltage for the sensor, and DC power or AC power can be used. Vout is sensing The voltage across the load resistor (R L) connected in series. Vcc is the test voltage for the load resistance RL, and a DC power supply is required.

Characteristic figures

The test is completed under standard test conditions. In the figure, R 0 represents the stable resistance value of the sensor in clean air, and Rs represents the stable resistance value of    the sensor in different concentrations of gas atmosphere.

The test is completed under standard test conditions. The curve in the figure represents the real -time voltage value of the sensor. The test gas is 0.4ppm formaldehyde gas, and the load resistance used is 51k.

In the figure, Rs represents the stable resistance of the sensor in 0.4ppm concentration of formaldehyde gas under different temperature and humidity conditions, and R0 represents the stable resistance of the sensor in 0.4ppm concentration of formaldehyde gas under 20℃ and 55%RH humidity conditions.

Sensor stability curve

The test is completed under standard test conditions. The abscissa is the time that the sensor continues to be energized, the ordinate is the actual voltage value of the sensor, and the load resistance used is 51k.