This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

  • Resolved

2-3 wire RTD signal conditioner 0.1 degree accuracy

Prodigy 40 points

Replies: 5

Views: 1153

Hi,

       This is Rajinder Verma from India, i am making an temperature meter which required RTD conditioner . 

>> If any one work on this i needed its circuit to get 0.1 degree celcius accuracy from 2-3 wire RTD.

  • Hi Rajinder,

    We have several TI Precision Designs that focus on RTD acquisition.  Please take a look at the following designs, they all focus on RTD sensor acquisition.  Because many of the errors are related to the full-scale signal, as you change the temperature ranges the expected errors will change as well.  Each of the designs include full error calculations that can be used to determine the expected error for modified temperature spans.

    1.) TIPD120:  3-wire PT100 RTD Acquisition System Accurately Measures Temperature From -200°C - 850°C

    -Feaures a digital SPI output with errors < 0.0125C over a -200C - 850C temperature span

    2.) TIPD152:  0°C – 100°C, Hardware-Compensated Ratiometric 3-Wire PT100 RTD System Reference Design0°C – 100°C

    -Features a digital SPI output with errors < 0.005C over a 0-100C temperature span

    3.) TIPD161:  Analog Linearized 3-Wire PT100 RTD to 2-Wire 4-20mA Current Loop Transmitter Reference Design

    -Features a 4-20mA output with hardware calibrated errors < 1C over a -200C-850C temperature span

    4.) TIPD202:  Analog Linearized 3-Wire PT1000 RTD to 2-Wire 4-20mA Current Loop Transmitter Reference Design

    -Features a 4-20mA output for PT1000 RTDs, hardware calibrated errors < 0.11C over a -50 - 250C temperature span

    Regards,
    Collin Wells
    Precision ADC Applications

  • In reply to Collin Wells:

    Respected Mr.Collin,

                                            Thanks for replying us, i bring these solutions to my senior engg. but due to some company policy i want sample  for  TIPD120 ,  TIPD152

    to check its accuracy level.

    >> Can your company has free sample policy? if so how can i order!

    -- 

    Thanks & Regards,
     
    Er.Rajinder Verma
    Embedded Design Engineer

    ADVANCETECH INDIA PVT LTD
    Ph: +919501525731
    websitewww.atechindia.com
  • In reply to Rajinder Verma:

    Hi Rajinder,

    We do not have samples available for these designs. The design files (GERBERS, BOM, Schematics, etc.) are included in the product folders for the designs.

    Regards,
    Collin Wells
    Precision ADC Applications

  • In reply to Collin Wells:

    Hi Collin,

                         Thanks for your reply, i am making this design.Hope it will as accurate as you mentioned.

    -- 

    Thanks & Regards,
     
    Er.Rajinder Verma
    Embedded Design Engineer

    ADVANCETECH INDIA PVT LTD
    Ph: 9501525731
    websitewww.atechindia.com
  • In reply to Rajinder Verma:

    Hi Rajinder,

    Follow the design guides in the document for both the schematic and PCB layout and you will achieve the same results.  Be careful to prevent PCB resistance from negatively affecting the RTD measurement by making proper Kelvin (4-wire) connections as described in the design guide and shown in the layout.

    Regards,
    Collin Wells
    Precision ADC Applications

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.