I'm with Phil here.. a hole drilled into the concrete to accomodate the sensor will yield solid readings. Other methods are unlikely to do so.
Best regards, Spehro Pefhany
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Well, the ends of either the heater wires or the heat tubes are right there at the power supply - either put the heater in a bridge and control it that way; if it's a liquid we need more information - for example, could you slide a thermistor up the line, catheter-style?
Good Luck! Rich
This is a non-starter - he wants to heat the concrete _before_ it freezes.
Hope This Helps! Rich
Or wet the floor and crank the heat up; the places where the lines are will dry first.
That'll do the trick. The OP might want to include an insulating layer over the top of the sensor to keep it from being influenced by air temperature. Then, just glue the whole shebang down.
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