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SensorAFE software and Methane sensor

Gaston_Melo_Arg
Mastermind 7675 points
Other Parts Discussed in Thread: LMP91000, LMP91050, LMP90100

Hi to all, 

             I'm using the LMP91000 and I can't find the Methane sensor in the software. Do I have to configure the soft to use the methane sensor ?

Regards

Gastón

  • 0
    TI__Intellectual 2630 points

    Gaston, Methane (CH4) specific electrochemical sensors are not included in the LMP91000 Sensor AFE software. Do you have a specific Methane sensor part number that your are trying to interface with the LMP91000?

    Often Methane is detected using IR (or specifically nondispersive infrared, NDIR) techniques. The LMP91050 Sensor AFE for NDIR gas sensing is available for this application.

  • 0 in reply to Jason Seitz
    Mastermind 7675 points

    Hi Jason, thanks for the quick reply. this is the sensor I've got

     http://www.citytech.com/PDF-Datasheets/4p75m.pdf 

     Do you have a recommendation that could adjust to the lmp91000?

    Regards

  • 0 in reply to Gaston_Melo_Arg
    TI__Intellectual 2630 points

    Gaston,

    Thanks for sharing the datasheet. It looks like this Methane sensor is based on a pellistor bridge circuit and produces a voltage output. On the other hand the LMP9100 is meant to interface withe electrochemical sensors which produce a current output. The LMP91000 uses a transimpedance amp (TIA) to convert the sensor output current to a voltage.

    The sensor that you have may best be handled by an AFE that is meant to interface with Wheastone bridge circuits. May I recomend that you take a look at the LMP90100 24 bit Sensor AFE for temperature, strain gauge, and wheatstone bridge based sensors.