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Pt100 Sensor Mounti

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davelovesbeer

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Looking at upgrading my brewery, and are wondering if a PT100 thermocouple has to be mounted in a thermowell, or can it be mounted straight in to a mash tun/HLT/kettle?

Just wondering what other people are doing, and if a thermowell is really required.

(p.s - title was supposed to be mounting - forgot the ng at the end),
 

dmac80

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A PT100 RTD won't need to be mounted in a thermowell, straight into the brewing vessel will be fine, as the homebrewing process doesn't reach any great temperatures or pressures.

The advantage is you will get a quicker temperature response.
 

adniels3n

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Thermowells add mechanical protection too.
Personally I wouldn't worry about it, but something to consider.
 

Wolfy

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A cheaper PT100 (from Ebay) is best mounted in a thermowell. They have a tendency not to seal around the nut (the probe is loose) and requires some kind of glue/weld or adhesive to seal, in addition the nut and assembly tend to rust, even if they are sold as 'stainless steel'.
 

Kai

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Someone correct me if I'm wrong here, please.

PT100's are resistive temperature detectors (RTD's) as opposed to thermocouples. As such, they're also more fragile than a thermocouple.

I'm wondering if, given the banging about that goes on with a homebrew vessel, if a thermowell is perhaps a good idea for a little extra protection for the probe from physical impact?
 

A3k

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i love the look of these & these . I really like the idea of unplugging the leads easily.

i almost bough a few, but had some DS18S20 sensors arived which worked well, so thought i'd give them a crack in a these thermowells. they've got lots of types.
i'm planning on getting a copper 1/2" plug, drilling a hole in it and putting a headphone jack on it, then using headphone leads to get all the sensors to the control box.
 

billygoat

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I have PT100 temperature probes installed in my set up without thermowells. They have been installed for nearly 3 years without leaks, rusting or failure.
They are mounted in my HLT, kettle, mashtun and HERMS. I purchased them from procon-products on Ebay and have found them to be good quality. I drilled an 8mm hole through the wall of the vessel and used a washer cut from a silicon baking mould, backed by a SS washer and tightened securely.

Probe_1.JPG


Probe_2.JPG
 

shmang

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hotchilli

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Cheap ones from china might not be as sturdy or accurate.
I use these cheap chinese knock-offs - 3-wire PT100 thermowell with integral probe & terminal head. Build quality is acceptable and performance is excellent - after all, the probe is just a few bits of platinum wire inside a SS tube. For $16 delivered it's great value and 3-wire has the advantage of taking into account the internal resistance of the wire back to the controller. Only drawback is that it's a 1/2" NPT fitting, not BSP, but in this size they are interchangeable.

http://www.ebay.com/itm/250514020092?ssPag...984.m1438.l2649
 

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