Temperature Controller ?

Discussion in 'The Projects Forum' started by janmarsh, Mar 7, 2009.

  1. janmarsh

    Thread Starter Member

    Feb 16, 2009
    12
    0
    Hello all, This question comes from a complete Noobz.

    I have a Carel IR32V4L Temperature Controller which recieves a sensor voltage signal ranging from 1 to -0.4 volt DC. I wish to use a National Semiconductor LM35DZ temperature sensor which has an output range of 6 to -1 Volt DC. How do I go about this ?

    Many thanks for any help. :)
     
  2. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    Are you sure about that part? The manual for the IR32V4L says it will take a J or K thermocouple, an NTC, or a PT100. The PT100 and NTC change resistance with temperature change. The thermocouples have output voltages far less than specified in your post.
     
  3. janmarsh

    Thread Starter Member

    Feb 16, 2009
    12
    0
    I,m Sure. Carel 4L (-0.4/+1 Vdc) Carel 2L (type J or K)

    The Carel literature is misleading. 0L (NTC) 1L (Pt100 probe) 3L (0/20 ma or 4/20 ma)
     
    Last edited: Mar 7, 2009
  4. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    If you can provide a link to the data on the Carel 4L, I might be able to suggest some options for conversion. Specifically, what temperatures do the listed voltage levels correspond to?
     
  5. janmarsh

    Thread Starter Member

    Feb 16, 2009
    12
    0
    www.tempatron.co.uk/manuals/IR32Manual.PDF :)

     
  6. janmarsh

    Thread Starter Member

    Feb 16, 2009
    12
    0
    I am hoping to embed the sensor within the windings of a purpose made alternator, switching in & out loading. I have found Carel use an LM35 in one of their sensors for this unit.
    Programming of the units seems very comprehensive. With thanks.
     
    Last edited: Mar 8, 2009
  7. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,347
    Hello,

    You can use the LM35 with an attenuator.
    The attenualtion factor can be corrected in the parameters C15 and C16.

    [​IMG]

    Greetings,
    Bertus
     
  8. janmarsh

    Thread Starter Member

    Feb 16, 2009
    12
    0
    Many thanks Bertus,
    Could you give me an idea of the attenuator spec., make, model ? You are communicating with a complete "Herbert" here. :)
     
  9. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,347
    Hello,

    What is the measuring range you want to use ?
    The LM35 has an output of 1.5 Volts at 150 °C.
    And -0.55 Volts at -55 °C.

    [​IMG]

    Greetings,
    Bertus
     
  10. janmarsh

    Thread Starter Member

    Feb 16, 2009
    12
    0
    I wish to use the high temperature range. The sensor is to detect the max. temperature of 150 c. + within alternator windings of class H spec. of 215 c. What temp. can a LM35 intermitently survive ?
     
  11. bertus

    Administrator

    Apr 5, 2008
    15,648
    2,347
    Hello,

    The LM35D has a maximum temperature of 100 °C.

    [​IMG]

    You can never measure the 215 °C with it.

    Greetings,
    Bertus
     
  12. janmarsh

    Thread Starter Member

    Feb 16, 2009
    12
    0
    I understand 215 c is not possible. The max. temp. of 100 c. in the case of LM35D will be sufficient.

    Many thanks to all the assistance.
     
    Last edited: Mar 9, 2009
Loading...