MQ-136 PDF – GAS SENSOR – Hanwei

Part Number : MQ-136, MQ136

Function : GAS SENSOR

Manufactures : HANWEI ELECTRONICS

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HANWEI ELECTRONICS CO.,LTD TECHNICAL DATA MQ-136 http://www.hwsensor.com MQ-136 GAS SENSOR Features Fast response and High sensitivity Stable and long life Simple drive circuit APPLICATION They are used in air quality control equipments for buildings/offices, are suitable for detecting of H2S. SPECIFICATIONS A. Standard work condition Symbol Parameter name Vc Circuit voltage VH Heating voltage RL Load resistance RH Heater resistance PH Heating consumption B. Environment condition Symbol Parameter name Tao Using Tem Tas Storage Tem RH Related humidity O2 Oxygen concentration C. Sensitivity characteristic Symbol Parameter name Rs Sensing Resistance Technical condition 5V±0.1 5V±0.1 can adjust 31 5% less than 800mw Technical condition -10 -45 -20 -70 less than 95%Rh 21%(standard condition)Oxygen concentration can affect sensitivity Technical parameter 30K -200K (10ppm H2S ) Concent rat ion (20/5) Slope rate 0.65 H2S Standard Detecting Condition Temp: 20 2 Vc:5V±0.1 Humidity: 65%±5% Vh: 5V±0.1 Preheat time Over 24 hour D. Structure and configuration, basic measuring circuit Remarks AC OR DC ACOR DC Room Tem Remarks minimum value is over 2% Ramark 2 Detecting concentration scope 1-100ppm H2S Parts 1 Gas sensing layer 2 Electrode 3 Electrode line 4 Heater coil 5 Tubular ceramic 6 Anti-explosion network 7 Clamp ring 8 Resin base 9 Tube Pin Materials SnO2 Au Pt Ni-Cr alloy Al2O3 Stainless steel gauze (SUS316 100-mesh) Copper plating Ni Bakelite Copper plating Ni Configuration A Fig. 1 Configuration B Fig.2 Structure and configuration of MQ-136 gas sensor is show n as Fig. 1 (Configuration A or B), sensor composed by micro AL2O3 ceramic tube, Tin Dioxide (SnO2) sensitive layer, measuring electrode and heater are fixed into a crust made by plastic and stainless steel net. The heater provides necessary work conditions for work of TEL: 86-371-5333098 5333099 FAX: 86-371-5333090 E-mail: sensor@371.net HANWEI ELECTRONICS CO.,LTD MQ-136 http://www.hwsensor.com sensitive components. The enveloped MQ-136 have 6 pin ,4 of them are used to fetch signals, and other 2 are used for providing heating current. Electric parameter measurement circuit is show n as Fig.2 E. Sensitivity characteristic curve Fig.3 is shows the typical sensitivity characteristics of the MQ-136 for several gases. in their: Temp: 20 Humidity: 65% O2 concentration 21% RL=20k Ro: sensor resistance at 10ppm of H2S in the clean air. Rs: sensor resistance at various concentrations of gases. Fig.3 sensitivity characteristics of the MQ-136 Fig.4 Fig.4 is shows the typical dependence of the MQ-136 on temperature and humidity. Ro: sensor resistance at 10ppm of H2S at 33%RH and 20 degree. Rs: sensor resistance at 10ppm of H2S at different temperatures and humidity. SENSITVITY ADJUSTMENT Resistance value of MQ-136 is difference to various kinds and various concentration gases. So, When using this components, sensitivity adjustment is very neces […]

MQ-136 Datasheet

MQ-4 PDF Datasheet – Gas Sensor – Hanwei

Part Number : MQ-4

Function : Semiconductor Sensor for Flammable Gas

Manufactures : Henan Hanwei Electronics

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Sensitive material of MQ-4 gas sensor is SnO2, which with lower conductivity in clean air. When the target combustible gas exist, The sensor’s conductivity is more higher along with the gas concentration rising. Please use simple electrocircuit, Convert change of conductivity to correspond output signal of gas concentration.

Gas sensor has high sensitity to Methane, also to Propane and Butane. The sensor could be used to detect different combustible gas, especially Methane, it is with low cost and suitable for different application. Character – Good sensitivity to Combustible gas in wide range – High sensitivity to Natural gas – Long life and low cost – Simple drive circuit Configuration Application – Domestic gas leakage detector – Industrial Combustible gas detector – Portable gas detector Technical Data Basic test loop Model No. Sensor Type Standard Encapsulation Detection Gas Concentration Loop Voltage Vc Circuit Heater Voltage Load Resistance VH RL Heater Resistance RH Character Heater consumption Sensing Resistance PH Rs Sensitivity S Slope α Tem. Humidity Condition Standard test circuit Preheat time MQ-4 Semiconductor Bakelite (Black Bakelite) Natural gas.

The above is basic test circuit of the sensor. The sensor need to be put 2 voltage, heater voltage(VH)and test voltage(VC). VH used to supply certified working temperature to the sensor, while VC used to detect voltage (VRL) on load resistance (RL)whom is in series with sensor. The sensor has light polarity, Vc need DC power. VC and VH could use same power circuit with precondition to assure performance of sensor. In order to make the sensor with better performance, suitable RL value is needed: Power of Sensitivity body(Ps): Tel: 86-371-67169070/80 Fax: 86-371-67169090  […]

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MQ-4 Datasheet