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  1. #1

    Pressure / Temperature Guage for p/t ports

    All:

    I would like to monitor EWT and LWT on my Waterfurnace unit. I have read that some people just stick a meat thermometer in the p/t port but those seem like they are too big.

    Ideally, I would like to purchase a real gauge set designed for this purpose but have had no luck finding what I need.

    Have any of you accessed your p/t ports on your systems? If so, what did you use?

    Thanks.

  2. #2
    Join Date
    Mar 2004
    Location
    SE Michigan
    Posts
    18,205
    To put the world in order, we must first put the nation in order; to put the nation in order, we must put the family in order; to put the family in order, we must cultivate our personal life; and to cultivate our personal life, we must first set our hearts right.
    -- Confucius

  3. #3
    Like many of my searches have found, I see those gauges have a large probe. Maybe I am just unfamiliar with the trade and their tools. Are gauges like this meant to be used for many purposes... and you screw on the probe that goes in the p/t port? If so, where are the p/t port probes for those gauges?

    Also, are the p/t ports a standard size... or do they vary as well. Mine look like they accept a probe less than 1/8" in size.

    Thanks.

  4. #4
    Join Date
    Mar 2004
    Location
    SE Michigan
    Posts
    18,205
    You get yourself a Tee and go from there.
    To put the world in order, we must first put the nation in order; to put the nation in order, we must put the family in order; to put the family in order, we must cultivate our personal life; and to cultivate our personal life, we must first set our hearts right.
    -- Confucius

  5. #5
    A Tee? I think we are thinking of different solutions. I need a gauge with a thin p/t probe on the end so I can stick it in the p/t port for temp checks. The gauge is not installed all of the time... just inserted into the p/t port when I want to do a check.

  6. #6
    Join Date
    Dec 2009
    Posts
    19

    Smile

    Cooper, Model DPP400W

  7. #7
    Thanks for the info, but those seem to have a larger diameter probe.

    I guess I need to get with my GEO installer and ask what size p/t ports I have. I am reluctant to pushing on the probe too hard, as I don't want to damage the port. I may just be a little too cautious and need to be more aggressive with it... but I don't want to screw up anything.

  8. #8
    Join Date
    Dec 2009
    Posts
    19

    Smile

    It works with my P/T ports!

  9. #9
    Join Date
    Mar 2008
    Location
    northern Indiana
    Posts
    114

    Temp probe

    May I suggest you get an electronic with 2 wired probes and strap them to the water lines inside the unit cabinet under the insulation. That way you can leave them there without disturbing the P/T ports.

  10. #10
    Join Date
    Feb 2004
    Location
    Pacific NW
    Posts
    570
    Harbor Freight $20 multimeters come with a type K thermocouple, but read only in degrees Centigrade.

    If deg C vs F does not bother you, the type K thermocouple is just 2 24 AWG wires!

    You spend more $$ for other type thermocouple meters, the HF one is about the cheapest I know of.

    You could also try an infrared detector - point and read the temp.

  11. #11
    Join Date
    Feb 2006
    Posts
    468

    Cooper Atkins DFP450W

    I just ordered one off EBay. I saw it yesterday at the Cooper booth at ACCA in Tampa. The tip necks down much narrower than typical digital thermometers

  12. #12
    Join Date
    Jan 2007
    Location
    Ontario , Canada
    Posts
    14

    gages and valves

    I am in process of installing 6 ton unit in my house and would like to install some gages for monitoring temperatures and water pressure. I would also like to install shot off valves on the header pipes prior to the circulating pumps. Installer would not install any of these .He is telling me that I don't need any valves nor do I need any gages. Can any body tell me where these gages should be physically installed on the pipes? Pipes from the circulating pumps to the unit are just rubber hose and I don't see how you can mount gages there unless you put some fittings on the rubber hoses.
    Thanks

  13. #13
    Join Date
    Oct 2008
    Location
    Northeast PA
    Posts
    257
    Quote Originally Posted by bunaca View Post
    I am in process of installing 6 ton unit in my house and would like to install some gages for monitoring temperatures and water pressure. I would also like to install shot off valves on the header pipes prior to the circulating pumps. Installer would not install any of these .He is telling me that I don't need any valves nor do I need any gages. Can any body tell me where these gages should be physically installed on the pipes? Pipes from the circulating pumps to the unit are just rubber hose and I don't see how you can mount gages there unless you put some fittings on the rubber hoses.
    Thanks
    I use hobo U12 loggers with pipe probes. They are very accurate and you can keep data forever. They are also inexpensive and with a 4-probe unit I measure the EWT, LWT and the outside air temp. I also record the kWH used by the geothermal HP and with these three measurements I can come up with heating degree days, cost and overall health of the system.

    If you get a probe just attach it to a piece of copper in/out of the GTHP and insulate it with rubber insulation. You will get good measurements this way.

    I have some experience with PT ports and I don't believe they are made for long term immersion.
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