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Calibrate thermistor and collect data

  1. Nov 22, 2011 #1
    Hi Guys,

    I am working on a project and am not that electrically savvy so I was hoping if someone could let me know how I'm doing.

    I want to use analog temperature probes (10K thermistors) and record data to a input module, which will convert it to Modbus (a communication protocol) that I can use for remote data aquisition.

    These are the senors I would like to use - http://www.datanab.com/sensors/Thermistor_SSP3.htm

    This is the input signal to Modbus converter that will accept the thermistors - http://www.obvius.com/pdfs/A8332-8F2D_Datasheet.pdf [Broken]

    As far as I know, as long as I can read the data, I should be able to use the Ohm conversion chart on the datanab.com website to convert to Temp.

    My main question is, if I change wire lengths, won't my resistance change. So I will need to calibrate each sensor based on wire lengths. Any suggestions on the best way to do this? I was going to use an ice bath, and a tea kettle boiler to calibrate at 0 and 100 degrees C.

    Anyone have experience in this matter? I'm not sure if I need to send power through those sensors or if the input module will do that. Sorry, kind of clueless on all of this.

    Last edited by a moderator: May 5, 2017
  2. jcsd
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