This is not so much a question as a report. My boss and I were talking about the above.. should the sensor go right on the plant (heater), or would it be better to move it away. I figured it would be about the same, but hey I'll do the measurement.
Here's the a pic of the setup,
so first with the sensor on the heater.. fast response.
Going to a lower temperature is not very interesting,
Going to higher temperature it's easy to see the exponential change in the remote sensor.
Now I used the remote sensor for control... changed time constant from 1 sec. to 30 sec. (I didn't play with the TC that much,15 sec was too much gain and 30 sec looke OK.)
Here's cooling.. (chan 2 is the sensor on the heater, but it's not very interesting.)
And the heating case,
To my eye there is not much difference between the two, and the much faster TC when the sensor is on the heater is a win. (This is something Phil H. told me years ago, I never quite believed him.... seeing is believing. :^)