Alphasense Ammonia(NH3) sensor

Other Hardware Sensors
1

Hello everybody,

I am working with an Alphasense Ammonia Sensor NH3-B1 on an Arduino Uno.
I designed a potentiostatic circuit on Eagle in order to operate the sensor, I took example on an Application Note to design this circuit. The Figure 1 in the Note shows the circuit to create.
Now, the PCB board is done and I am trying to get back data from the sensor on my PC but I don't know exactly how to do.
I just have an output on the board and I think I have to connect the output to the Arduino Uno, but on which pin (analog inputs, A0 I presume) ?
I searched on others forums for an answer but I didn't find anything, and there is nothing on Alphasense website.

Datasheet of the Ammonia Sensor: http://www.alphasense.com/WEB1213/wp-content/uploads/2013/07/NH3B1.pdf

Datasheet of the Application Note: http://www.alphasense.com/WEB1213/wp-content/uploads/2013/07/AAN_105-03.pdf

2

Can someone help me ? I am trying to get back data from this sensor.
In the output signal, I get back a voltage and I would like to convert this value in PPM concentration.
Any ideas ?

3

If you don't know how to read voltages using the Arduino, work through the simple ADC examples provided with the Arduino IDE (development software).

4

So you built Figure 1. What did you choose for Rload? Have you calculated the gain of the circuit? Have you calculated the expected output range for the full range of expected inputs for your sensor?

Is that range within the range that the Arduino can measure?