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thermocouple tp01 K type.

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xchcui:
Hi.
I have a standard thermocouple probe type-K
TP01 for air measurements(see photo)and the datasheet says
that it can measure until 400°C.
My question is:why does it limit to 400°C?
is it because the wire or wire's insulation can't handle temp.
above 400°C?(will it melt?),is it because that the junction can be damaged by the heat?or them all can actually stands higher temp
but the results won't be accurate?
Thanks.

Borek:
Probably to some extent all of above. Plus it is quite possible the probe itself is soldered to the wires and can lose contact when the solder melts.

xchcui:
Thanks Borek.
I asked this question since i was trying to measure
the air temperature that blow-out from an hot air gun.
The heat gun has two temp. options:300°C and 600°C.
Since my tp01 is not made to measure 600°C,i bought
a cheap TP02 probe(see photo)that made to measure until
750°C(at least,this is what was stated in the datasheet),
but the problem that when i was trying to measure the 600°C
option with the TP02,the reading didn't passed the ~400°C.
I though first,that the heat gun has a problem,but then i measured the 300°C
option with the TP02 and the TP01 and i found that,while the TP01
give me a reading of about ~330°C,the TP02 give me a hardly a reading of
220°C.What are you thinking?is this a problem with the TP02 probe?

Borek:

--- Quote from: xchcui on February 25, 2022, 05:17:30 AM ---a cheap TP02 probe
--- End quote ---

Probably you got what you paid for.

Try to calibrate both probes for several different temperatures to see if they show similar results. For absolute measurements 0°C and 100°C are good calibration points as they can be easily and quite accurately reproduced using just water and ice. That can already tell you if the probes are worth anything.

xchcui:
The first thing that i did was testing the tp02 on ice and boiling water.
It gave me a correct reading for this test,but i bought this probe for
temp. above 400°C not 0-100°C.Why could be the reason that it can't
measure correct even on temperatures around 300°C(gives ~100°C less than
real temperature),while it made for temp. till 750°C?
BTW,the TP01 is my old probe and everything is fine with it,
it just wasn'tt made for temp. above 400°C.
My issue is with the new TP02 that i bought.

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