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<p><strong><span style=”font-size:18px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Description</span></span></strong></p>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>MQ7 is a semiconductor sensor which can detect the presence of carbon monoxide gas at concentrations from 10 to 1000 ppm. The sensitive material used for this sensor is SnO2, whose conductivity is lower in clean air. It’s conductivity increases as the concentration of carbon monoxide gas increases. It makes detection by method of high (5V heating) and low (1.4V heating) temperature. It can detect CO during low-temperature heating. When high-temperature heating is employed, it cleans other gases adsorbed under low temperature. </span></span></p>
<p> </p>
<p> </p>
<p><span style=”font-size:18px;”><span style=”font-family:Arial,Helvetica,sans-serif;”><strong>Features</strong></span></span></p>
<ul>
<li><span style=”font-family:Arial,Helvetica,sans-serif;”><span style=”font-size:14px;”>Low Cost</span></span></li>
<li><span style=”font-family:Arial,Helvetica,sans-serif;”><span style=”font-size:14px;”>High Sensitivity to Carbon monoxide</span></span></li>
<li><span style=”font-family:Arial,Helvetica,sans-serif;”><span style=”font-size:14px;”>Stable and Long Life</span></span></li>
<li><span style=”font-family:Arial,Helvetica,sans-serif;”><span style=”font-size:14px;”>Simple drive circuit</span></span></li>
<li><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Easily interfaced with Microcontrollers, Arduino Boards, Raspberry Pi etc using an Analog to Digital Converter (ADC).</span></span></li>
</ul>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”> </span></span></p>
<p><br />
<strong><span style=”font-size:18px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Specification</span></span></strong></p>
<ul>
<li>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Operating Voltage: DC 5V</span></span></p>
</li>
<li>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Analog Output (AO): 0~5V analog output voltage</span></span></p>
</li>
<li>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Digital Output (DO): 0V or 5V output</span></span></p>
</li>
<li>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Configuration: Through Potentiometer (adjusts the output level transition)</span></span></p>
</li>
<li>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Preheat Duration: 20s</span></span></p>
</li>
<li>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Weight: 10g</span></span></p>
</li>
<li>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Dimensions: 23 * 19 * 19 mm</span></span></p>
</li>
</ul>
<p> </p>
<p><strong><span style=”font-size:18px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Sensor Technical Data</span></span></strong></p>
<ul>
<li>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Circuit Voltage : 5V ±0.1 AC or DC</span></span></p>
</li>
<li>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Heating Voltage High : 5V ±0.1 AC or DC</span></span></p>
</li>
<li>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Heating Voltage Low : 1.4V ±0.1 AC or DC</span></span></p>
</li>
<li>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Load Resistance : Adjustable</span></span></p>
</li>
<li>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Heater Resistance : 33Ω ±5% at Room Temperature</span></span></p>
</li>
<li>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Heating Consumption : < 350mW</span></span></p>
</li>
<li>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Operating Temperature : -20°C ~ 50°C</span></span></p>
</li>
<li>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Detection Range: 10 ~ 1000 ppm of carbon monoxide</span></span></p>
</li>
</ul>
<p> </p>
<p> </p>
<p><span style=”font-family:Arial,Helvetica,sans-serif;”><span style=”font-size:14px;”>Alternative MQ Gas Sensors</span></span></p>
<table border=”1″ cellpadding=”1″ cellspacing=”1″>
<tbody>
<tr>
<td>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Sensor Name</span></span></p>
</td>
<td>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Gas to measure</span></span></p>
</td>
</tr>
<tr>
<td>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>MQ-2</span></span></p>
</td>
<td>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Methane, Butane, LPG, Smoke</span></span></p>
</td>
</tr>
<tr>
<td>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>MQ-3</span></span></p>
</td>
<td>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Alcohol, Ethanol, Smoke</span></span></p>
</td>
</tr>
<tr>
<td>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>MQ-4</span></span></p>
</td>
<td>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Methane, CNG Gas</span></span></p>
</td>
</tr>
<tr>
<td>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>MQ-5</span></span></p>
</td>
<td>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Natural gas, LPG</span></span></p>
</td>
</tr>
<tr>
<td>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>MQ-6</span></span></p>
</td>
<td>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>LPG, butane</span></span></p>
</td>
</tr>
<tr>
<td>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>MQ-7</span></span></p>
</td>
<td>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Carbon Monoxide</span></span></p>
</td>
</tr>
<tr>
<td>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>MQ-8</span></span></p>
</td>
<td>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Hydrogen Gas</span></span></p>
</td>
</tr>
<tr>
<td>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>MQ-9</span></span></p>
</td>
<td>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Carbon Monoxide, flammable gasses</span></span></p>
</td>
</tr>
<tr>
<td>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>MQ135</span></span></p>
</td>
<td>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”>Air Quality</span></span></p>
</td>
</tr>
</tbody>
</table>
<p> </p>
<p><span style=”font-size:14px;”><span style=”font-family:Arial,Helvetica,sans-serif;”><span style=”box-sizing: border-box; max-width: 100%; word-break: break-word;”><span style=”box-sizing: border-box; max-width: 100%; word-break: break-word;”><a href=”https://www.sparkfun.com/datasheets/Sensors/Biometric/MQ-7.pdf”><span style=”color:#3498db;”>Datasheet: MQ-7 GAS SENSOR</span></a></span></span></span></span></p>
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