MP-7 datasheet(4/6 Pages) WINSEN

4 / 6 page

Zhengzhou Winsen Electronics Technology Co., Ltd

www.winsensor.com

Tel: 86-371-67169097

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Basic circuit

This circuit shows the basic measuring circuit of MP-7 sensor. Two

voltage should be applied to this sensor, heating voltage (VH) and

testing voltage(Vc). VH is used for supplying a certain temperature,

both of DC or AC are suitable. While detecting CO gas, the VH need to

be at 1.5V±0.1V low voltage condition; while non detecting

(recovering) status, it must be at 5V±0.1V. VRL is voltage on the series

load resistance(RL). Vc is the testing voltage to RL, It must be DC

Fig2. MP-7 test circuit

Characterization

Fig3. Typical Sensitivity Curve

The ordinate is resistance ratio of the sensor

(Rs/R0), the abscissa is concentration of gases. Rs

means resistance in target gas, R0 means resistance

of sensor in clean air. All tests are finished under

standard test conditions.

Fig4. Typical temperature/humidity characteristics

The ordinate is resistance ratio of the sensor

(Rs/Rso).Rs means resistance of sensor in 100ppm

CO gas under different tem. and humidity. Rso means

resistance of the sensor in 100ppm CO gas under

20℃/55%RH.

Fig5.Sensitive curve

VRL in different CO concentration, RL=4.7K, All tests

are finished under standard test conditions.

Fig6.Response and Resume

Sensor in air, different CO concentration and

recover form CO

MP-7 Datasheet(PDF) 4 Page - Zhengzhou Winsen Electronics Technology Co., Ltd.