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LMP91000 COSH sensor (H2S + CO)

Other Parts Discussed in Thread: LMP91000

Can you confirm that a pair of LMP91000's can be used with a COSH sensor (H2S + CO)?  I would assume that I can connect counter, reference, and one of the two workers of the COSH sensor to one LMP91000, then connect the 2nd worker to 2nd LMP91000 utilizing only the TIF section.  I noticed that the TIF section can be used in support of a galvanic 2-terminal sensor, ignoring the A1 circuit, so I assume that I can take this approach in support of the COSH sensor.  Please confirm.


Thanks,
Dave

  • Dave,


    LMP91000 questions are now being answered out of the Precision Amplifiers Forum. I've moved this post there, and I think you'll get an answer.


    Joseph Wu
  • Hi David,

    I do not see a problem with that. As long as both are run off the same reference voltage, this should be doable.

    On the second LMP91000 I would tie the CE and RE together to keep it from doing anything weird, and make sure the FET switch stays open.

    Just make sure the combined WE currents does not overload the CE amplifier output (Spec is a minimum current of 750uA - so I would keep it below 1mA).

    Regards,