MEMS VOC Gas Sensor
（
Model No.:GM-502B
）
Manual
Version: 1.1
Valid from: 2017.5.10
Zhengzhou Winsen Electronics Technology Co., Ltd
Page 1: ...MEMS VOC Gas Sensor Model No GM 502B Manual Version 1 1 Valid from 2017 5 10 Zhengzhou Winsen Electronics Technology Co Ltd ...
Page 2: ...rdance with the instructions If users disobey the terms or remove disassemble change the components inside of the sensor we shall not be responsible for the loss The specific such as color appearance sizes etc please in kind prevail We are devoting ourselves to products development and technical innovation so we reserve the right to improve the products without notice Please confirm it is the vali...
Page 3: ...ity Fast response and resume Simple drive circuit Application Gas leak detection for mobile phones computers and other consumer electronics applications also for breathing gas detection control smoke alarm indoor etc Main Parameter Part No GM 502B Sensor Type MEMS VOC Sensor Standard Encapsulation Ceramic Detection Gas Ethanol formaldehyde toluene etc Detection Range 1 500ppm Standard Circuit Cond...
Page 4: ...Sensor Structure Diagram Recommend Circuit Pin Connect RH1 RH2 RS1 RS2 ...
Page 5: ...target gas with different concentration R0 means resistance of sensor in clean air All tests are finished under standard test conditions Fig4 Typical temperature humidity characteristics Rs means resistance of sensor in 150ppm CO gas under different temp and humidity Rso means resistance of the sensor in 150ppm CO gas under 20 55 RH Fig5 Responce and Resume The output in above Fig is the voltage o...
Page 6: ...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 m...
Page 7: ...d 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 for long time sensors characteristic will be affected If lighter gas sprays the sensor it will cause extremely damage 2 3 Long time exposed to extreme environment No matter the sensors electrified or not if exposed to ad...
Page 8: ...Generally the sensor at a relatively high temperature will reach equilibrium faster so you can boot in the first tens of seconds it can give a higher voltage sensor to warm up For C2H50H working at 50mW the first 30 seconds use 80mw heating In general the longer the preheating time the better the accuracy of the sensor ...
Page 9: ... exposed to halogen such as fluorine 1 4 Touch water Sensitivity of the sensors will be reduced when spattered or dipped in water 1 5 Freezing Do avoid icing on sensor s surface otherwise sensing material will be broken and lost sensitivity 1 6 Applied voltage Applied voltage on sensor should not be higher than 120mW it will cause irreversible heater damaged also hurt from static so anti static pr...
Page 10: ...e above using terms sensors sensitivity will be reduced Zhengzhou Winsen Electronics Technol Zhengzhou Winsen Electronics Technology Co Ltd Add No 299 Jinsuo Road National Hi Tech Zone Zhengzhou 450001 China Tel 86 371 67169097 67169670 Fax 86 371 60932988 E mail sales winsensor com Website www winsen sensor com ...
