As promised all done. Wiring the PIDS were done and all work. First fire up this weekend. Hope the photos are okay. The camlocks are now brass not alloy.
Spent 6 weeks building this thing off and on. Full blown valved reflux still. The coil in the head unit was upgraded from 1/4 inch tube to 3/8 tube. The hoses from the tank are 3/4 and the connections attached to the still are 1/2 inch. They then hook into the 3/8 coil. Instead of 8 loops have increased to 14 and the head is 3" longer thus ensuring it will remain nice and cool with little restiction of flow or effort from the pump. The flow rate can be adjusted by a flow valve.
The test the other day had the head temp at a constant 10 degrees celcius on a 31 degree celcius day in the sun, so shouldnt be an issue. If I need it to get colder, Ill run the pipe work through a cool box.
The cooling is run by a submerisble pump from a 500 litre water tank.
Has two 2200 Watt stainless steel heating elements, has a stainless steel float valve which will shut off the element when the mash gets too low and will prevent element burning out.
There is one thermocouple in the column that monitors the head temp and one in the boiler that monitors the mash temp. This one is adjustabe through the PID and SSR unit. Also have a digital thermometer in the head to ensure there are no issues should the PIDS crap out.
Everything is either copper or stainless and the column is filled with Raschig Rings.
If you want more pictures, let me know
Cheers and many thanks for the information and help.