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Thermistor Temperature Sensor

Discussion in 'Sensors and Actuators' started by KTW, Dec 1, 2015.

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  1. KTW

    KTW

    273
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    Feb 22, 2015
    I have a temperature control that reads one degree lower than the trigger temperature setting and I'm wondering if there is a method to have the sensor adjustable to calibrate it to the control?
    If the trigger is set at 15C it doesn't trigger until it reaches 14C.
    Does the one meter of wire add significantly to the resistance of the sensor, would adding or removing wire change the resistance to a point where it affects temperature ?

    http://www.ebay.com/itm/400762591095?_trksid=p2060353.m2749.l2648&ssPageName=STRK:MEBIDX:IT
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    9,908
    2,100
    Nov 17, 2011
    The specs of the controle say "Accuracy: ±1°C (-20°C~70°C)" so your experience is within specs. Unless there is a calibration trimmer accessible, I doubt you will reach higher accuracy with this controller. AS the sensor (NTC) comes with one meter of wire, the resistance of this wire should already be included in the factory calibration.
     
  3. AnalogKid

    AnalogKid

    2,352
    659
    Jun 10, 2015
    The wire is not the source of error for a 10K sensor. Even at high temperatures it is around 3K ohms, thousands of times larger than the wire resistance. OTOH, the unit is only +/- 1C accurate, so technically it is within spec. If you don't see a calibration trimpot peeking out anywhere, or don't want to open the unit and search for one, I think you're out of luck.

    ak
     
  4. Colin Mitchell

    Colin Mitchell

    1,418
    314
    Aug 31, 2014
    Set the trigger at 14 degrees
    Or you may be able to add a resistor in series with the sensor.
     
  5. KTW

    KTW

    273
    15
    Feb 22, 2015
    An interesting note is a feature of the controller is CA:Calibrate temperature reading.Range from -9 to 9.Default:0
    For example ,when reading on the controller is 3 degree below real temperature,please set CA= 3.
    When reading on the controller is 3 degree above real temperature, please set CA=- 3.

    I changed these settings and nothing changed but I will look for a trimpot inside.
    What value of trimpot would be expected?
    Thanks for the responses.
     
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