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   Does anyone else use an infrared....
  Posted by: jaws on May-04-13 3:11 PM (EST)
   Category: Other Gear 

thermometer to take temp readings of water. I am sometimes surprised by what I would guess the water temp to be and what it actually is.

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  5 to 6 to 7 ft under the surface
  Posted by: willi_h2o on May-04-13 5:04 PM (EST)
-- Last Updated: May-04-13 5:07 PM EST --

Might "look" warm on the surface to the thermogun.
Actually dangling toes a few feet down....another story.

Thermocline in effect.

  sure, but
  Posted by: CEWilson on May-05-13 8:13 AM (EST)
The IR thermometer gives faster readings than any immersion unit, but, as pointed out, that doesn't tell us much about deeper water, and for our purposes, a submersible that can lower to, say 6 ft is too expensive, bulky, etc to be practical for paddlers.

  So all paddlers are ony 4 ft tall...?
  Posted by: willi_h2o on May-05-13 8:13 PM (EST)
-- Last Updated: May-05-13 8:25 PM EST --

What happens when a 6 ft paddler falls out of their boat,
--do you think the toes on that person feel cold water ?

Be real - it's an unrealistic gauge of the water temps.

Take a standard thermometer, tape it to a filled nalgene,
throw it over the side, tethered on a string, BELOW the water surface.
Much, much cheaper and far more accurate of paddling conditions

Used thermoguns 100 times a day developing thermoplastic parts
and they are great for surface temps only, 1mm deep maybe.

  Limits of Infra Red thermal sensing
  Posted by: plaidpaddler on May-06-13 7:50 PM (EST)
Infrared Sensors work best with black body, carbon structures. They work poorly with shiny metal surfaces and liquid surfaces. For copper tubing its always best to color the surface with a black grease pen. For liquids they are just poor. Best to shoot the same flat object submerged in the liquid long enough to reach water temperature.
Every year I have people concerned that their domestic hot water system is faulty because their Infra-red thermometer is showing different temperatures all over their piping system. The Rocket Scientists at MIT that designed the early and expensive Micro-Scanner supplied a Nisan black grease pencil with each unit and detailed directions on using it with different materials. Directions more detailed than those supplied by Harbor Freight and others.
  Posted by: RockyRaab on May-07-13 5:04 PM (EST)
I bought a $4 Harbor Freight digital thermometer, stuck the probe lengthwise through a wine cork and float it in my kayak scupper. After you push the button, it stays on for a couple minutes before shutting itself off. Works just fine for surface temps.
  Water temp
  Posted by: tkamd on May-08-13 11:25 PM (EST)
I just use a digital meat thermometer, accurate enough,, only care about the first couple of feet, cause that's all I'm using. tkamd


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