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121GW Thermocouple Question

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JDW:
I recently purchased a 121GW, and while comparing the included Thermocouple with that of my Fluke 116, I noticed the 121GW's thermocouple has a transparent, slidable piece and I would like to know the purpose.  Please see my finger point to it in the attached photo.  The Fluke meter's thermocouple doesn't have such a slidable piece, which makes me wonder why it's needed.

Thanks.

[attachimg=1]

Overspeed:
Hello

that an open thermocouple so the weld is exposed , the plastic sleeve is used to protect the soldered bead end and also to avoid electrical contact when used on equipment under power

Regards
OS

JDW:
Thank you for explaining, although I will admit I still don't understand, for two reasons:

1. I've been using my K-type sensor for years along with my Fluke 116, and never had any issues without that little transparent tube, and
2. When I connect the metal tip to measure the temperature of something, the metal tip is never touching merely another wire, and therefore, that little transparent tube wouldn't be able to fit over the sensor's metal tip and the thing it's touching to measure temperature.

So for now, I still don't see the need for it.

mendip_discovery:
Let us just say you want to check the temperature in the oven. If the metal part of the probe accidentally touches the element with 240V (110 for the luddites) heading down the wire, now its not likely to cause an issue. Still, if you were to come in contact with either of the two banana connectors at the yellow plug end you would get that voltage running through you, as someone who has been at the end of a few shocks, it is not fun or wise to repeat.

So it's a bit of health and safety stuff that is there to protect you, but there is a very low risk of it happening. Some of my low temp probes have some heat shrink on the end to avoid it making contact.

thm_w:

--- Quote from: mendip_discovery on January 27, 2023, 02:08:43 pm ---Let us just say you want to check the temperature in the oven. If the metal part of the probe accidentally touches the element with 240V (110 for the luddites) heading down the wire, now its not likely to cause an issue. Still, if you were to come in contact with either of the two banana connectors at the yellow plug end you would get that voltage running through you, as someone who has been at the end of a few shocks, it is not fun or wise to repeat.

So it's a bit of health and safety stuff that is there to protect you, but there is a very low risk of it happening. Some of my low temp probes have some heat shrink on the end to avoid it making contact.

--- End quote ---

The heatshrink is more to prevent the braided outer fiberglass sleeve from coming loose, which could be the case here as well.

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