Pt100


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  1. #1
    Prolific Poster joesaliba's Avatar
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    Default Pt100

    I went to look a car booth spray temperature controller as readings where incorrect. Turned out to be a wire. However, I would like to buy some spare sensors just in case the one fitted goes wrong.

    With me I had a PT100, which when I measured the resistance at the room temperature was 106ohms. Then I measured the other one and it was something around 55ohms.

    So the PT100 is 100ohms, and the other? I tried googling for a PT50, but nothing turned up. What is the correct name for such a sensor please?
    Regards

    Joseph

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    Fanatical Contributor fanie's Avatar
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    Default Re: Pt100

    So the PT100 is 100ohms, and the other? I tried googling for a PT50, but nothing turned up. What is the correct name for such a sensor please?
    The correct name is PT100, and it is supposed to be 100R at 0oC. If it's value is off it may be damaged.

    It is basically the same as a thermistor, and you get a PT1000 as well. They are supposed to be accurate.

    I don't use them because they are expensive. I use the electronic sensors like the 18B20 for up to 120oC, and over that I use type K thermocouples, with an opp amp. Also, if a sensor is close to linear it does not require a table to get a close enough value.

    I see there are stoves that use thermistors for the temperature control, but the only ones we get to buy are low temperature ones. I just modified the wife's oven using a type K thermocouple and through the range it is almost spot on up to 180oC. She doesn't use more than 180oC

    I want to add, I checked the price for the PT100 here, cost R800 and R500, which is ridiculous.
    Last edited by fanie; 12th January 2019 at 17:36.
    Fanie

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    Fanatical Contributor Tim's Avatar
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    Default Re: Pt100

    I'm not sure where you get them but PT50 is a thing.

    https://www.technocontrols.com/wire-...-elements.html
    Tim

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    Prolific Poster joesaliba's Avatar
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    Default Re: Pt100

    Thanks Tim,

    And that is why I got another controller because I couldn't find one PT50.
    Regards

    Joseph

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    Fanatical Contributor fanie's Avatar
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    Default Re: Pt100

    Thanks Tim, it seems they make a wide range of PT's.
    Fanie

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