On Oct 8, 2011, at 10:08 PM, Alan Fletcher wrote:
I think that the sensor is under the black tape near the END of the pipe -- you can see the wire going under it -- which I estimated as 5 cm from the center.
That tape is not on the the sensor per se but on a wire leading to the sensor. The wire looks to be long enough to make it to the steel nut. Look again at
http://www.redmatica.com/media/Thermo1.jpgThe red arrow points to the tip of the thermocouple I think. There appears to be some frayed insulation pealed back near there. It looks like a bug. The thermocouple protrudes to the left of that. The sensor appears to have a clear tape on it, like Scotch tape, but back from the tip, and way forward from the black tape.
In: http://www.redmatica.com/media/Thermo2.jpgyou can see that there is enough room for the sensor to extend out over the top of the big steel nut. You might have to blow up the section next to the red arrow to see the sensor tip. I have attached a clip of the sensor tip in which you can see the nut at the bottom and the red arrow tip at the left. The stuff to the bottom of the sensor, bottom left of photo, looks like either Scotch tape or frayed insulation.
<<inline: SENSOR.png>>
I did my calculation before you posted that ... if Mario Masso used HIS sensor position that would increase the calculated error.
I haven't found his post. If anyone has a URL it would be appreciated.
----- Original Message -----Two more pictures of the thermocouple (from user agoz on 22passi blog)http://www.redmatica.com/media/Thermo1.jpg http://www.redmatica.com/media/Thermo2.jpg Another user on 22passi (Mario Massa) computed that the thermocouple in that position could give a reading as higher as 5 deg C more then the water temperature (given the thermal resistance of brass and of the contact surface water-brass )
Best regards, Horace Heffner http://www.mtaonline.net/~hheffner/
