MQ-306

www.DataSheet4U.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). DataSheet4U.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...