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| www..com HANWEI ELETRONICS CO.,LTD MQ-306 http://www.hwsensor.com GAS SENSOR MQ-306 for FLAMMABLE GAS * High sensitivity * Low power consumption * Miniature-size The MQ-306 is a tin dioxide semiconductor gas sensor which has a high sensitivity to Flammable Gas with quick response speed. This model is suitable for LPG,LNG, iso-butane,propane,H 2 detection such as portable gas detector. 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). .com DataShee Operating conditions Fig 2 shows the standard operating circuit for this model. The change of the sensor resistance (R S ) is obtained as the change of the output voltage across the fixed or variable resistor (R L ). In order to obtain the best performance and specified characteristics, the values of the heater voltage (V H ) circuit voltage (V C ) and load resistance (R L ) must be within the range of values given in the standard operating conditions shown in the Specification table on the next page. Sensitivity characteristics Fig 3 shows the sensitivity characteristics curves of the MQ-306 (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. .com TEL: 86-371-5333098 5333099 FAX: 86-371-5333090 E -mail: sensor@371.net DataSheet 4 U .com www..com HANWEI ELETRONICS CO.,LTD MQ-306 http://www.hwsensor.com A. Standard Operating conditions Symbol Parameter Specification Conditions etc. VH VC Heater voltage Circuit voltage Load resistance Heater resistance Heater current Heater power consumption Power dissipation of sensing element 3.0V 0.10V Less than 6 V Variable (> 10 ? ? ?) 16? ??? ? 2 Less than 80 mA Less than 250 mW Less than 10 mW P P AC or DC DC (polarity is important) P S< RL RH IH PH PS Symbol 10 mW at room temperature IH = VH / RH H= S= (typical value) H VH / R (V C- 2 (typical value) 2 V RL ) /RS t4U.com B. Environmental conditions Parameter .com Specification Conditions etc. Tao Tas RH (O2) Operating temperature -20 o C to 50 o C -20 o C to 70 o C Less than 95% RH Absolute minimum level: more then 18% 21%A 1%(Standard condition) The sensitivity characteristics are influenced by the variation in oxygen concentration. Recommended range Storage temp Relative humidity Oxygen concentration C. Sensitivity characteristics Model Symbol Parameter Specification MQ-306 (tentative specifications) Conditions etc. Rs Sensor resistance (20k? ? 200 k ) ?to ? V C : 5.0 V ? ? 1% V H : 3.0V ? ? 1% R L : 50K ??? 5 % at iso-butane 1000 ppm Sensitivity (0.70 ?? 0.1) ? Standard Test Conditions: Temp: 20 o C ? ?2 o C Rs (at iso-butane 3000 ppm) / Rs (at iso-butane 1000 ppm) Humidity: 65% ? ? 5% (in clean air) Pre-heating time: more than 48 hours D. Mechanical characteristics Items Conditions Specifications Vibration Frequency: 100 cpm Vertical amplitude: 4 mm Duration: 1 hour Acceleration: 100G Number of impacts: 5 times Should satisfy the specifications shown in the sensitivity characteristics. Shock HANWEI ELETRONICS CO.,LTD TEL:+86-371-8732420 8732424 6953352 FAX:+86-371-8730444 6962121 E-mail:sensor@371.net http://www.hwsensor.com .com TEL: 86-371-5333098 5333099 FAX: 86-371-5333090 E -mail: sensor@371.net DataSheet 4 U .com |
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