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Experimenting with Temperature Sensors

Test number TWO
The Radiator Test



Having written a script to capture the data, the next step was to monitor something 'real'. I decided to monitor the radiator in the office. Using the 5 probes (I did this before I got the additional ten sensors), so having 5, I decided on two room temperatures, the in and out flow of the radiator, as well as the top of the actual radiator. The data captured a period from before the heating boiler came on to after it went off.


The image is bigger than shown here, the four lines are:-
RED - boiler flow into the radiator
BLUE - temperature of the radiator
GREEN - boiler flow out of the radiator
PURPLE - room temperature

As expected, The boiler supply ramps up to the hottest temperature fairly quickly, the return temperature obviously doesn't make it as high due to heat loss in the radiator (it's what it is supposed to do), and follows a more gradual change.
The Radiator temperature gets up to what appears to be a working temperature and hovers around there until the heating turns off. The room temperature being a bigger volume of area to heat, takes longer, and conversely takes longer to cool down.
The temperature probe for the 'room' probably wasn't well positioned due to the lengths of the sensor cables, everything had to be within 1 metre of a connection block.

The only unexpected result was the 'saw tooth' red line. I'm guessing this was the thermostatic valve cutting in and out, restricting the supply of heat to the radiator.