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부품번호 | MQ-303A 기능 |
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기능 | GAS SENSOR | ||
제조업체 | HANWEI ELETRONICS | ||
로고 | |||
HANWEI ELETRONICS CO.,LTD
MQ-303A
http://www.hwsensor.com
GAS SENSOR MQ-303A for ALCOHOL DETECTION
* High sensitivity
* Low power consumption
* Miniature-size
The MQ-303A is a tin dioxide semiconductor gas
sensor which has a high sensitivity to alcohol with quick
response speed. This model is suitable for alcohol
detection such as portable breath alcohol checker or
ignition locking system in automobiles.
Structure
Gas sensitive semiconductor material is a mini bead type and a heater coil and electrode wire are embedded
in the element. The sensing element is installed in the metal housing which uses double stainless steel mesh (100
mesh) in the path of gas flow. The mesh is an anti-explosion feature
(Fig 1).
Operating conditions
Fig 2 shows the standard operating circuit for this model. The
change of the sensor resistance (RS) is obtained as the change of the
output voltage across the fixed or variable resistor (RL). In order to
obtain the best performance and specified characteristics, the values
of the heater voltage (VH) circuit voltage (VC) and load resistance (RL)
must be within the range of values given in the standard operating
conditions shown in the Specification table on the next page. Generally,
the sensor enters into normal working conditions after several minutes’
preheating, If you connect the sensor heater with a high voltage 2.2 ±
0.20V for 5-10 sec before normal testing , the sensor shall stabilize and
enter into normal working conditions quickly.
Sensitivity characteristics
Fig 3 shows the sensitivity characteristics curves of the MQ-303A (typical data). Sensitivity characteristics of the
gas sensors are expressed by the relationship between the sensor resistance and gas
concentration. The sensor resistance decreases with an increase of gas
concentration based on a logarithmic function.
TEL: 86-371-67169070 67169080
FAX: 86-371-67169090
E-mail: [email protected]
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다운로드 | [ MQ-303A.PDF 데이터시트 ] |
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구매 문의 | 일반 IC 문의 : 샘플 및 소량 구매 ----------------------------------------------------------------------- IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한 광범위한 전력 반도체를 판매합니다. 전력 반도체 전문업체 상호 : 아이지 인터내셔날 사이트 방문 : [ 홈페이지 ] [ 블로그 1 ] [ 블로그 2 ] |
부품번호 | 상세설명 및 기능 | 제조사 |
MQ-303A | GAS SENSOR | HANWEI ELETRONICS |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |