Sensor Probe Questions

[Silo Ted]

Thinking about options to mount a sensor probe in my mash-tun, which will either be an analogue dial or hooked up to a temp controller (or both! I have a bit of pocket money to spend on the brewery right now).

Wanting a right angle probe, at approx 170mm + 170mm, so mash temp can be measured right in the middle of the mass. Would also like a silicone sheath across the horizontal length to buffer the heat source and have the readings taken from the vertical length.

So what's in a probe ? Is it simply a spike of stainless steel, and are they designed to be calibrated with the output based on length?

Speaking of an NTC sensor if going for the temp controller option.

 

[raven19]

The electrical temperature probes I use on my RIMS (RTD PT100's) are basicly 3 wires glued inside a SS sheath.

K Types are 2 wires I think and of similar construction.

My limited understanding is that the 3 wire probes work based on resistance between the wires (length not an issue), and that the 2 wire versions are calibrated based on the wire length also - I dont believe the probe length has anything to do with temp readings given as its just a sheath protecting the wire ends from the mash.

2c.