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  1. #1
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,915

    I'm finally doing my Digi-cool mod.

    After checking a Cooper-Atkins pipe wrap probe against the stock Digi-Cool probe at 6 different temperatures from -10F to +200F, I decided to go ahead and do it.


    More pictures after I fix the mistake hole I made in the case.
    If more government is the answer, then it's a really stupid question.

  2. #2
    Join Date
    Feb 2010
    Location
    In a boiler room
    Posts
    7,224
    Mistake hole? I would call it a practice hole

    Looking good! I have been thinking of doing the same with my 1250.

  3. #3
    Join Date
    May 2007
    Location
    Central NJ Area
    Posts
    888
    What does this mod achieve? Changing the sensor input location and differnet type of sensors? I'm interested on what improvements it makes. Is this a mod on an AK900?

  4. #4
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,915
    Quote Originally Posted by chuckcrj View Post
    Mistake hole? I would call it a practice hole
    My intent was to make a countersunk area around the smaller hole the jack mounts to, but I mistakenly had my drill on high speed, and the countersink bit into the plastic real hard and went all the way through.
    Nothing some JB Weld won't fix, and I think I'll like having the probes plug in up higher more than down low.

    Quote Originally Posted by Nytefog View Post
    What does this mod achieve? Changing the sensor input location and differnet type of sensors? I'm interested on what improvements it makes. Is this a mod on an AK900?
    It's a DRSA-1250, the mod allows the use of Cooper-Atkins thermistor probes.
    In my case, I'm using the #4011 pipe wrap probes because their design is superior to the probes available from Digi-Cool, or any of the other digital manifold makers.
    They have very low thermal mass, so respond very quickly, and are much better isolated from the ambient air temperature.
    They also only cost about $50 each.
    At some point I'll pick up another Digi-Cool gauge set, probably an AK900, and will modify them to accept the Cooper probes too, so I can use the same probes with multiple gauges.

    The more common mod is to make an adapter for the probe socket on the gauge so that the Cooper probes can be used, but I didn't want to have to deal with an adapter.

    I just wish Testo didn't use proprietary thermistors with the 550, or I'd do a mod for it too.
    If more government is the answer, then it's a really stupid question.

  5. #5
    Join Date
    Mar 2007
    Location
    wedged in freezer shelf
    Posts
    7,215
    Lookn good Mark. Those sensors are sweet. Are those the standard panel mount jacks from Radio Shack just covered with shrink wrap?
    If You Can Dodge A Wrench You Can Dodge A Ball

  6. #6
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,915
    Quote Originally Posted by itsiceman View Post
    Are those the standard panel mount jacks from Radio Shack just covered with shrink wrap?
    Yeah, I wanted something better, but it is slim pickins in the 1/8" size. 1/4" has a much better selection, including locking and water proof jacks.

    The plug and wiring are from an old PWM controlled computer fan I had in a junk box.

    I used shrink wrap that has an adhesive inside of it to help protect against accidental water intrusion. They are no longer water proof enough to submerge, or leave out in the rain for hours, but they are protected enough for the occasional splash.
    A few drops of water getting in the jacks won't hurt anything.

    I'm thinking of mixing up a little of the 2 part silicon rubber I use for condensation proofing chilled water cooled electronic parts and injecting it into the jacks, then plugging the sensors in until it cures.
    Once it cures, the plugs will slide in and out like normal, but the jack will be completely sealed against water getting into the gauge housing.
    If more government is the answer, then it's a really stupid question.

  7. #7
    Join Date
    Oct 2005
    Location
    USA
    Posts
    45
    Quote Originally Posted by mark beiser View Post
    After checking a Cooper-Atkins pipe wrap probe against the stock Digi-Cool probe at 6 different temperatures from -10F to +200F, I decided to go ahead and do it.


    More pictures after I fix the mistake hole I made in the case.

    LOL typical heating and cooling tradesman... just can't NOT tear something apart and make it better...I once gutted an electric furnace and redid everything because I did not like the way the wiring was done...and I had some time on my hands...Shift+R improves the quality of this image. Shift+A improves the quality of all images on this page.

  8. #8
    Join Date
    Aug 2003
    Location
    Central Kentucky
    Posts
    6,248
    Very cool Mark! Can't wait to see finished photos.
    Have you set up a Google alert for Carbon Monoxide yet?
    Click here to find out how.

  9. #9
    Join Date
    Jul 2006
    Location
    Anytown USA
    Posts
    2,064
    Lookin good! Those Cooper sensors work great with Digicools.

  10. #10
    You sure that mod will hold up?
    I've head rumors that the adaptation was not 100% successful.

    Is the resistance vale thru the cooper sensors the same as the DC?

    If not I think that would affect accuracy,,,would it not?

    HMMM....BTW....aren't you GreeK?

  11. #11
    Join Date
    Jul 2006
    Location
    Anytown USA
    Posts
    2,064
    Quote Originally Posted by hvac5646 View Post
    You sure that mod will hold up?
    I've head rumors that the adaptation was not 100% successful.
    I've had this done for a couple years now. I tested the cooper sensors before I used them on the Digicools.. I don't remember the exact temperatures I tested at, but they read the same below 0, in the 30's, and at room temp..

  12. #12
    Quote Originally Posted by y7turbo View Post
    Lookin good! Those Cooper sensors work great with Digicools.
    You sure that mod will hold up?
    I've head rumors that the adaptation was not 100% successful.

    Is the resistance vale thru the cooper sensors the same as the DC?

    If not I think that would affect accuracy,,,would it not?

    HMMM....BTW....aren't you GreeK?

  13. #13
    Join Date
    Jul 2006
    Location
    Anytown USA
    Posts
    2,064
    Quote Originally Posted by mark beiser View Post

    I'm thinking of mixing up a little of the 2 part silicon rubber I use for condensation proofing chilled water cooled electronic parts and injecting it into the jacks, then plugging the sensors in until it cures.
    Once it cures, the plugs will slide in and out like normal, but the jack will be completely sealed against water getting into the gauge housing.
    Do you have a web link to the stuff you use?
    Last edited by y7turbo; 02-23-2013 at 01:12 PM.

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