My New PT100 Switch Box

The V1 Brewery uses a PID unit to display temperatures from a PT100 probe which I use for various applications. I use the probe to measure things such as grain temp pre dough in, boiler temp for steeping hops, pre heating my heat exchanger prior to recirculation etc. I’m making a few brewery modifications introducing a fixed PT100 in the HERMS heat exchanger, one in the wort outlet and one in the coolant inlet of my gasketed plate heat exchanger. This means I want 4 PT100 inputs going to one PID unit.The PID unit only has one set of PT100 probe input terminals at its rear, so I had to find a way of inputting 4 PT100 signals to the PID unit, through this one terminal. This has been achieved by switching the inputs from the PT100's, to the PID unit, via a switch box. This means that one PID unit can now disply the inputs from 4 different PT100's, depending on the switch position at the switch box.
This is the switch box I made.