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Digital Cat Probe

Post in 'The Hearth Room - Wood Stoves and Fireplaces' started by mellow, Feb 5, 2013.

  1. mellow

    mellow Resident Stove Connoisseur

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    With all the talk about digital temp probes I wanted to start a thread on one for Cat's, my issue so far is finding a K-type probe that is rated for 2000 degrees, which a cat can very easily attain.

    The one I was looking at is made for a Kiln: http://www.auberins.com/index.php?main_page=product_info&cPath=17&products_id=282

    Now my question is if I insert that probe into my hole for my existing Condar probe could I put the ceramic sheath on in between the hole and the cat? I don't think I could fit that probe plus sheath through my existing hole without drilling it out. Hoping someone has gotten that probe before.

    I had looked at the Condar digital probe but it will not allow for buzzer alarms at set temps.

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  2. raybonz

    raybonz Minister of Fire

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    http://www.omega.com/toc_asp/frameset.html?book=Temperature&file=SEL_GUIDE_THERMOCOUPLE

    http://www.omega.com/ppt/pptsc.asp?ref=BARE_SH_DH_OV_ELEMENTS&Nav=tema02
  3. WES999

    WES999 Minister of Fire

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  4. raybonz

    raybonz Minister of Fire

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    The thermocouple wire can handle the heat but is limited by the insulation on the wire.. The problem is the temp control would probably go out of range with a probe inside the flue stack with a temp limit of 732 degrees F (400 degrees C)

    Ray
  5. WES999

    WES999 Minister of Fire

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    The OP did not say which controller he is using or what the high limit is, certainly the controller would need a higher limit than 750::F to be useful for cat or flue temp measurement.

    Are you perhaps mixing up threads with the one from
    Scoby?
  6. raybonz

    raybonz Minister of Fire

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    Yes I think I got the temp control mixed up thanks for pointing this out ;) The part about the TC is correct though..

    Ray
  7. mellow

    mellow Resident Stove Connoisseur

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    The controller is the one in the link I provided, I have an email into Auber asking what would be the best way to do this for a cat.
  8. raybonz

    raybonz Minister of Fire

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    Yup that looks fine.. I posted what you need for a T\C.. Ceramic insulators can handle those temps easily..

    Ray
  9. jharkin

    jharkin Minister of Fire

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    Pm Joful. He shared a setup like you are looking for that was inexpensive.
  10. mellow

    mellow Resident Stove Connoisseur

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    Auber got back to me, I am going to go with the AT100 controller and the WRNK-191 6" probe. $66.34 with shipping, cheaper than the Condar with a built in buzzer and AC powered.
  11. Joful

    Joful Minister of Fire

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    Most K-type meters are suitable for 2500F, so you want to verify your meter has the range, but that's likely not a big problem. The wires are outside the heat envelope, so they're rarely the problem. The bottleneck is indeed the probe.

    Any 1/16" 3/16 stainless probe is rated to roughly 1650F, and that's what I've been using, as I had center-drilled my access port screw plugs to that diameter. I have confirmed that they do indeed fail after several weeks at 1750F.

    The OmegaCLAD probe sheath is rated to 1900F at 1/16" diameter, or 2100F at 1/8" diameter. Furthermore, moving the probe/wire transition further from the heat source improves durability. So, I'm going to try the TJ36-CCXL-116U-12-CC, a 12" long x 1/16" diameter K-type probe, with 36" fiberglass wire.

    FWIW, the app's engineer at Omega had recommended a TJ36-CCXL-18U-6-CC, which is a 6" long x 1/8" diameter K-type probe, with 36" of fiberglass wire, but I'd really rather try to stick with my 1/16" pilot hole, if I can. I believe most commercial probes (Condar) are 1/4" diameter x 6" long, so a direct replacement for that would be TJ36-CCXL-14U-6-CC, if you already have the access hole drilled.

    edit: I'm surprised Auber's probe handles 2000F. Others rate 1/16" Inconel probes at lower temperatures, typically 1700F.
  12. mellow

    mellow Resident Stove Connoisseur

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    I guess we will find out, went ahead and placed the order.
  13. raybonz

    raybonz Minister of Fire

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    Just like electrical wire the insulation dictates what the metal can handle.. Use ceramic insulation and you will be fine.. Ceramics can handle intense heat..

    Ray
  14. Joful

    Joful Minister of Fire

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    Cool. I just ordered two of the OmegaCLAD XL's in 1/16". Are you using yours for cat temp or flue temp?

    True, but in this case, it's the metal! We're talking about the metal probe sheath, 316 stainless vs. Inconel vs. OmegaClad, not the wire insulation. The wire insulation is fiberglass, in either case.
  15. raybonz

    raybonz Minister of Fire

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    Metal probe sheath is fine it is the insulating material of this sheath that is the concern.. More than likely you're fine..

    Ray
  16. mellow

    mellow Resident Stove Connoisseur

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    This is going to replace my Condar cat temp probe. I would like to be able to keep a closer eye on how my cat functions while sitting on the couch watching tv, I will probably set the high temp alarm for 1900 degrees.
  17. raybonz

    raybonz Minister of Fire

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    I would want to know if my cat hit 1450+ and even this is excessive.. Anything higher than this is too hot for normal operation..

    Ray
  18. mellow

    mellow Resident Stove Connoisseur

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    Do what??? Where are you pulling that from?
  19. raybonz

    raybonz Minister of Fire

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    Ran a cat stove for 25 years.. The condar probe spells this out along with many owners manuals.. 1750 is not normal operating temp for a cat..
  20. mellow

    mellow Resident Stove Connoisseur

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    Not my Condar probe: 1700 starts to get in the too hot zone.
    [​IMG]
  21. raybonz

    raybonz Minister of Fire

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    Exactly 1750 is too hot your pic show this.. Not normal to run at 1700 I hate to tell you..

    Ray
  22. mellow

    mellow Resident Stove Connoisseur

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    It might be because mine is a newer cat but it will purr at 1750-1800 when I load it full for the night, with all the air shut down. Now that you mention it maybe I should set the high temp at 1800 just in case.

    Or maybe my probe is off? Guess I will find out with this new one.
  23. Joful

    Joful Minister of Fire

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    You been drinkin' again, ol' Ray? ;lol

    Omega lists a 300 degree difference between their various metal probe sheaths, even with the same wire type inside.

    My stove manual agrees with my cat manual, operation up to 1800F is normal. Mine usually runs 1650F - 1750F for the first few hours of the burn.
  24. raybonz

    raybonz Minister of Fire

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    Anything above 1400 would get my attention.. A new cat will run hotter for sure but that is short lived from my experience.. Generally I saw around 1400 for high temps after this then cruised between 600-1000 degrees..

    Ray
  25. raybonz

    raybonz Minister of Fire

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    Yup a few beers but I do understand thermocouples and work with them in much hotter temps.. Insulation is what dictates how much heat the probe can handle the same as regular electrical wire however copper cannot handle what a T\C can withstand.. ;)

    Ray

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