Installing temperature probes

[ramloese]

I just purchased and received three of these for my three kettle system:

https://www.amazon.com/dp/B00899A4LY/?tag=skimlinks_replacement-20

However, I am wondering if I should cut a hole in my kettles to fit just these sensors or if I should get some additional larger tube-like item where I can insert these sensors into?

 

[bionut]

That's called a thermowell, you don't really need one as long as you can find suitable silicone gasket and stainless steel washer for that small diameter thread.
Type K thermocouples aren't really precise, you would be better with a PT100 probe that has three wires. The K type is used more in high temperature situations were a few degrees off aren't a problem. Also, you can find pt100 with 1/2 thread for better mounting.

 

[ramloese]

That's called a thermowell, you don't really need one as long as you can find suitable silicone gasket and stainless steel washer for that small diameter thread.
Type K thermocouples aren't really precise, you would be better with a PT100 probe that has three wires. The K type is used more in high temperature situations were a few degrees off aren't a problem. Also, you can find pt100 with 1/2 thread for better mounting.

I suspected that actually so I also got three PT100s:
https://www.amazon.com/gp/product/B00X6RIARO/?tag=skimlinks_replacement-20

Question remains though. I really wanna be able to remove them when washing the kettle. How can I make the easily removable?

 

[bionut]

Why do you want to remove them when washing? Either way, directly or with a thermowell, you will have to unscrew the lock nut to remove the sensor of the thermowell from the kettle.
If you only want to be able to pick the kettle and get it out for cleaning you should buy a pt100 probe that has a detachable wire.

New Electric Sensor High quality RTD PT100 Temperature Sensors 1/2 Inch NPT Threads With Detachable Connector Useful Tool Tools
http://s.aliexpress.com/IRzIBvyQ?fromSns=Copy to Clipboard
(from AliExpress Android)

 

[ramloese]

Why do you want to remove them when washing? Either way, directly or with a thermowell, you will have to unscrew the lock nut to remove the sensor of the thermowell from the kettle.
If you only want to be able to pick the kettle and get it out for cleaning you should buy a pt100 probe that has a detachable wire.

New Electric Sensor High quality RTD PT100 Temperature Sensors 1/2 Inch NPT Threads With Detachable Connector Useful Tool Tools
http://s.aliexpress.com/IRzIBvyQ?fromSns=Copy to Clipboard
(from AliExpress Android)

I also see these PT100 have three wires. Arent they only supposed to have positive and negative? What to do with the third?