I have the Pentair Solartouch controller works very well. It shuts down flow to the panels when a cloud comes over, also puts pump into low speed when solar is not available or viable.
My panels/sensor is roughly 75 feet from the controller, i haven't noticed any problems with probe readings, but if I want I can recalibrate the sensors. When the rooftop sensors reads 40+ C temp rise thru the panels is roughly 5 C. I have a laser temp reader.
Thank you for the reply.
Is this the controller you have?
Pentair SolarTouch Control System 521592
Only the SolarTouch solar system gives you the precision and reliability of full digital control.
sunplay.com