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      Zhengzhou Winsen Electronics Technology Co., Ltd                         

www.winsen-sensor.com

                                    

 

 

Tel: 86-371-67169097/67169670    Fax: 86-371-60932988                                Email

sales@winsensor.com

 

 

Long-term stability:

   

 

 

 

Instructions: 
1. Preheating time 

 

Sensor

s resistance may drift reversibly after long-term storage without power. It need to preheat the sensor to 

reach inside chemical equilibrium. Preheating voltage is same with heating voltage V

H

. The suggested preheating 

time as follow: 

Storage Time 

Suggested aging time 

  Less than one month 

No less than 48 hours 

1 ~ 6 months 

No less than 72 hours 

More than six months 

No less than 168 hours 

2. Calibration

 

Sensor

s accuracy is effected by many factors such as reference resistance

’s

 difference, the sensitivity difference, 

temperature, humidity, interfering gases, preheating time, the relationship between input and output is not 

linear,

 

hysteretic and non-repetitive. For absolute concentration measurement, they need regular calibration 

(one-point calibration / multi-points calibration for full scale) to ensure that the measuring value is accurate. For 

relative measurement calibration is not required.

 

Cautions 
1 .Following conditions must be prohibited 

1.1 Exposed to organic silicon steam                                 

Sensing material will lose sensitivity and never recover if the sensor absorbs organic silicon steam. Sensors 
must be avoid exposing to silicon bond, fixature, silicon latex, putty or plastic contain silicon environment. 

1.2 High Corrosive gas 

If  the  sensors  are exposed  to  high  concentration corrosive  gas  (such as  H2S,  SOX,  Cl2,  HCL etc.),  it  will  not 

Fig7.long-term Stability

 

Test is finished in standard test conditions, the abscissa is observing time and the ordinate is voltage output of RL. 

 

Voltage output(V)

 

Preheating time(days)

 

Содержание GM-402B

Страница 1: ...y Co Ltd www winsen sensor com Tel 86 371 67169097 67169670 Fax 86 371 60932988 Email sales winsensor com MEMS Combustible Gas Sensor Model No GM 402B Manual Version 1 1 Valid from 2017 05 10 Zhengzho...

Страница 2: ...suse please read the manual carefully and operate it correctly in accordance with the instructions If users disobey the terms or remove disassemble change the components inside of the sensor we shall...

Страница 3: ...tible gases Small sizes and low power consumption Fast response and resume Simple drive circuit Long lifespan Application Gas leak detection for mobile phones computers and other consumer electronics...

Страница 4: ...B test circuit Instructions The above fig is the basic test circuit of GM 402B The sensor requires two voltage inputs heater voltage VH and circuit voltage VC VH is used to supply specific working tem...

Страница 5: ...4 Typical temperature humidity characteristics Rs means resistance of sensor in 5000ppm methane CH4 under different temp and humidity Rso means resistance of the sensor in 5000ppm methane under 20 55...

Страница 6: ...ases preheating time the relationship between input and output is not linear hysteretic and non repetitive For absolute concentration measurement they need regular calibration one point calibration mu...

Страница 7: ...sensors surface and keep a certain period sensors sensitive will be decreased 2 2 Used in high gas concentration No matter the sensor is electrified or not if it is placed in high gas concentration f...

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