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Rex C100 doesn't suport Fahrenheit.

it will work , but16 awg wire is overkill for this purpose

You can't drive that SSVR directly from arduino. To do this you need to add lots of circuitry. SSVR is analog phase- angle controller. If you have an arduino you can do a digital phase angle controller one of example http://playground.arduino.cc/Main/ACPhaseControl

This controller is great but it designed for 50Hz AC current. On 60Hz (as in US and Canada) it gives absolutely inconsistent output.

Yes, alarm output is just like a switch. So connect 5 to 1, 6 to buzzer and other buzzer wire to 2.

BCS probes are NTC type. And they are not supported by MyPin or Auber PIDs

You forgot about jumper wire. By the new diagram you need it installed between PID terminals 5 and 2

You need a jumper wire between PID terminals 4 and 1 to make buzzer works. You can also simplify your controller a bit if you connect wire going from buzzer to fuse to PID terminal 2 instead. Buzzer circuit will be proteted by PID fuses and you can get rid of separate fuse for buzzer...

PT100 is pretty much standard type of temperature sensors for brewing application. And PT100 is not thermocouple.

Regular DPDT switch is able to control thermosensor selection. If you add a DPDT relay with 120V coil connected in parallel with one of contactor coil it will automaticaly select proper thermoprobe .

Diagram is OK. You can tie to SSR signals together since PID has galvanically insulated power supply. However DPDT switch as schematix suggested will be safer option.

You can easily use only one SSVR with PID if last one has a relay output.

Do you have an Ohm-meter or multimeter? If so you can measure an element resistance. For 240V 2000Watt it should be around 29 Ohm, for 120V 2000 Watt element it's around 7 Ohm.

Autotune procedure just calculate P,I and D parameters optimal for present setup. If you set a different target temperature PID will try to maintain the new temperature not a temperature you set during autotune. However if your new temperature is far enough from autotune temp - parameters...

This controller http://brumatic.com/BRU-matic-DBC1MA-DBC1MA.htm has everything you listed except separate switch for elements. However main switch kills power for everything including both elements legs.

Mypin and as far as I know Auber PIDs dont support NTK sensors.

Yes it does. But 10-15% variation of lwater level is OK.

What exactly solenoid type/spec and what are you are using to power it?

That "controller" is just a regular 16Amp SSR with embedded heatsink. It can't be controlled by potentiometer. But you can connect it to a PID.

Sorry - I didn't noticed that price is for 25 pieces. My apology.