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Summary of Contents for Winsen GM-502B
- 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 Statement This manual copyright belongs to Zhengzhou Winsen Electronics Technology Co., LTD. Without the written permission, any part of this manual shall not be copied, translated, stored in database or retrieval system, also can’t spread through electronic, copying, record ways.
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Page 3: Main Parameter
GM-502B MEMS VOC Gas Sensor Product description MEMS combustible gas sensor is using MEMS micro-fabrication hot plate on a Si substrate base, gas-sensitive materials used in the clean air with low conductivity metal oxide semiconductor material. When the sensor exposed to gas atmosphere, the conductivity is changing as the detected gas concentration in the air. - Page 4 Sensor Structure Diagram Connect ① ② ③ ④ ⑤ ⑥ ⑦ ⑧ Recommend Circuit...
- Page 5 Instructions: The above fig is the basic test circuit of GM-502B.The sensor requires two voltage inputs: heater voltage (V ) and circuit voltage (V ). V is used to supply specific working temperature to the sensor and it can adopt DC or AC power. V is the voltage of load resistance R which is in series with sensor.
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Page 6: Long-Term Stability
Long-term stability: Fig7.long-term Stability Test is finished in standard test conditions, the abscissa is observing time and the ordinate is voltage output of RL. 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. - Page 7 2.6 Soldering Soldering flux: Rosin soldering flux contains least chlorine and safeguard procedures. If disobey the above using terms, sensors sensitivity will be reduced. Zhengzhou Winsen Electronics Technology Co., Ltd Add: No.299, Jinsuo Road, National Hi-Tech Zone, Zhengzhou 450001 China...
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Page 8: Preheating Time
Manual: 1. Preheating time Sensor needs some time to reach inside chemical equilibrium so it takes some preheating time. 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. -
Page 9: Sensor Calibration
2. Sensor Calibration For absolute concentration measurement, sensors accuracy can be affected by many factors such as reference resistance difference, the sensitivity difference, temperature, humidity, interfering gases, aging time, therefore they need regular calibration. For relative measurement calibration is not required. Because the sensor characteristic curve is not linear, it is recommended in the whole range of multi-point calibration and consider the influence of temperature and humidity. - Page 10 2.6 Soldering Soldering flux: Rosin soldering flux contains least chlorine and safeguard procedures. If disobey the above using terms, sensors sensitivity will be reduced. Zhengzhou Winsen Electronics Technology Co., Ltd Add: No.299, Jinsuo Road, National Hi-Tech Zone, Zhengzhou 450001 China...
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