PT100 not linear ?

Discussion in 'General Electronics Chat' started by rollo, Jun 24, 2011.

  1. rollo

    Thread Starter New Member

    Jun 24, 2011
    2
    0
    Hello all,

    I have maybe a stupid qeustion but i will asking anyhow :
    Is it possible that a analog amplifier (4-20 mA/24 V DC) connected on a 3 or 4 wire PT100 will behave not linear while the PT100 (measuring range 0-150 C°)is good functioning ?
    I want to know if calibrating at 3 points (0-75-150 C°) is neccerary when calibrating at one point is enough when you check the whole loop.
    The PT100 is always linear but i want to calibrate with amplifier and i am curious if the amplifier is acting always linear between 4-20 mA when i calibrate.
    I see a amplifier only as a simple converter from resistance to mA ?

    Thanks in advance for the answer. ;)

    Rollo
     
    Last edited: Jun 24, 2011
  2. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    8,754
    760
    Welcome.

    Care to explain a bit more ?
     
  3. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,348
    Hello,

    PT100 sensor are not lineair.
    There are even tables to translate the resistance to the temperature.
    Here is a page from teh EDUCYPEDIA with circuits and other information on the PT100:
    Pt100

    Bertus
     
  4. rollo

    Thread Starter New Member

    Jun 24, 2011
    2
    0
    Hello Rif,
    I have more info added on the first post and more info below:

    When i determine a error of 1%,is this error then on the whole range when i connect de PT100 and the programmed amplifier ?
    Is this what you looking for?
     
    Last edited: Jun 24, 2011
Loading...