user14875: 
hi. i don't know how can i connect Mics-5132 CO Sensor to my arduino.
plz help 

user6945: That is a very skimpy data sheet for the MiCS-5132 .  (Shame on manufacturer for not including isolation information between heater and resistor output).
Connect 3.2 volts (3.3 volts is ok) to pins 1 and 3 (heater). Keep in mind the heater will draw about 32 mA.
Pins 2 and 4 are the output.  The output is a resistor, whose value changes with the degree of detected gases. And the resistance is about 160 k ohms.  
Wire a resistor (call it R1) from VCC (positive power) to your input. Start out with R1 = 150k  (anything from 120K to 180K). .   
Wire the sensor (pin2) to your input (use an input that can do A/D conversion).  Wire the other side of the sensor (pin 4) to your board ground.  
This makes a resistor voltage divider to your input pin. Your input pin should be an A/D converter.  The A/D converter input should return a value dependent upon the sensor resistance.  
Experiment with different values for R1, to get the input range that you desire.

14875: <p><a href="https://i.stack.imgur.com/6g0Og.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/6g0Og.png" alt="datasheet"></a></p>

<p>hi. i don't know how can i connect Mics-5132 CO Sensor to my arduino.</p>

<p>plz help </p>
 6945: <p>That is a very skimpy data sheet for the MiCS-5132 .  (Shame on manufacturer for not including isolation information between heater and resistor output).</p>

<p>Connect 3.2 volts (3.3 volts is ok) to pins 1 and 3 (heater). Keep in mind the heater will draw about 32 mA.</p>

<p>Pins 2 and 4 are the output.  The output is a resistor, whose value changes with the degree of detected gases. And the resistance is about 160 k ohms.  </p>

<p>Wire a resistor (call it R1) from VCC (positive power) to your input. Start out with R1 = 150k  (anything from 120K to 180K). .   </p>

<p>Wire the sensor (pin2) to your input (use an input that can do A/D conversion).  Wire the other side of the sensor (pin 4) to your board ground.  </p>

<p>This makes a resistor voltage divider to your input pin. Your input pin should be an A/D converter.  The A/D converter input should return a value dependent upon the sensor resistance.  </p>

<p>Experiment with different values for R1, to get the input range that you desire.</p>
