• State Resolved
  • Locked Locked
  • Replies 5 replies
  • Answers 1 answer
  • Subscribers 31 subscribers
  • Views 576 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

LMP91000: Current-to-Voltage Amplifier (15na) Amperometric, 3-electrode sensors

Rey Cédric
Prodigy 30 points
Part Number: LMP91000
Other Parts Discussed in Thread: ADS1115,

Hello community,


I'm looking for a chip that could convert me for an industrial Amperometric sensor, 3-electrode a low current data (in the nanoampere range) to a current that could be read by a 16bit ADS1115 to convert the data and retransmit it in I2C to my ESP32-S3 microcontroller.

I've already designed all the other elements, but I'm stumbling over this sensor, which I haven't mastered yet. The sensor datasheet is very limited, except that the sensor transmits data linearly from 15 to 25na / ppm. (VOC sensor)

Can you advise me on the component that could be integrated into my circuit? I've seen LMP91000 but I'm not sure.

Thanks in advance,
Cédric


  • 0
    TI__Genius 10245 points

    Hi Cedric,

    Thanks for reaching out, LMP91000 is likely the device to use. Can you tell me what chemical you are trying sense? The LMP91000 is compatible with specific chemical sensor cells so if you can tell me the chemical(s) you want to sense, I can try to see which cell would be best for you.

    Regards

    -Alex Thompson

  • 0 in reply to Alex Thompson
    Prodigy 30 points

    Hi Alex,
    Thank you for your feedback. This is for a VOC sensor (ES1-AG1-2000 from EC Sense.

  • 0 in reply to Rey Cédric
    TI__Genius 10245 points

    Rey,

    This particular sensor isnt in our database, but LMP91000 should still be good for you to use. As long as that VOC sensor is a 3 lead electrochemical cell, it should be fine. The LMP91000 should work fine with 25nA/ppm sensitivity as well, based on other chemical cells we have compatability with.

    Thanks

    -Alex Thompson

  • 0 in reply to Alex Thompson
    Prodigy 30 points

    Thank you Alex,
    By the way do you have some equivalent VOC Sensor to propose? This is the only that I found on the market for compact VOC up to 1000/2000ppm

    Best Regards,
    Cédric

  • 0 in reply to Rey Cédric
    TI__Genius 10245 points

    Cedric,

    Unfortunately I dont have another one to recommend. Our LMP91000 EVM software (unfortunately we dont have these EVMs anymore) contains a list of compatible chemical cells to sense certain chemicals (such as Ammonia, Chloride, etc). VOC chemical cells are not listed, so I dont have one to recommend, but I see no reason why the one your chose wont work with LMP91000.

    Regards

    -Alex Thompson