This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Alphasense CO-A4 sensor readout with LMP91000

Other Parts Discussed in Thread: LMP91000

Hello

I am currently working on LMP91000 to get the signal readout from Alphasense CO-A4 sensor. 

It seems like I do not get proper signal since I am getting few mV signals which at 350k TIA gain, which can be converted to few nA current from the sensor. 

That does not make sense since the sensor sensitivity is 220 to 375 nA/ppm

http://www.alphasense.com/WEB1213/wp-content/uploads/2015/01/COA4.pdf

To bias the sensor, the main factors are Variable Bias of A1 amplifier and Vref divider for Non-inverting input of TIA and may Rload. 

Can anyone please suggest how much bias I need to set to operate Alphasense CO-A4?