The Yorkies definitely know more about this than me, but I think they have been using the electronic flow sensors for a little while. We also have a hospital we take care of with a bunch of big YK's and they all have it. I have also seen some air handlers that measure return and outside airflow using these sensors.
Originally Posted by maxster
I think the term they are using for them is "thermal dispersion sensor". I could be wrong, but as I understand it, there's a heater in the probe, and the controller keeps track of the heater temperature and the heat loss from the probe. It compares the two and determines whether flow is present.
The key to happiness is lower expectations.