Non-expendable K type test sensors for TUS as per AMS 2750E
Non-expendable K type test sensors for TUS as per AMS 2750E
(OP)
Any expert in familar with AMS 2750E could help to answer the specific question for me?
That is for the usage of non-expenable K type test sensors for TUS sensors.
In Figure 1, it is mentioned that non-expandable E&K type sensors are not permitted for re-calibration if used above 500F.

In my understanding those could still be reused with restrictions of 3.1.3.4 and 3.1.3.5. However, this was only mentioned for using exclusively under 1200 F (650 C). So what about those above 650 C? How many times or how long could it be used (for non-expendable E & K type sensors above 650 C)?
That is for the usage of non-expenable K type test sensors for TUS sensors.
In Figure 1, it is mentioned that non-expandable E&K type sensors are not permitted for re-calibration if used above 500F.

In my understanding those could still be reused with restrictions of 3.1.3.4 and 3.1.3.5. However, this was only mentioned for using exclusively under 1200 F (650 C). So what about those above 650 C? How many times or how long could it be used (for non-expendable E & K type sensors above 650 C)?





RE: Non-expendable K type test sensors for TUS as per AMS 2750E
The drift in type K is huge, and at first it drifts one way, and then the other.
Just by Type N and be done with it.
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P.E. Metallurgy, Plymouth Tube
RE: Non-expendable K type test sensors for TUS as per AMS 2750E
Thanks for your reply.
Non-expendable type K is not premitted for TUS testing at all? Is there any clear statement on this?
I am not quite understanding the idea behind this. As you can see, for recalibration, the expendable base metal sensor is not permitted while it is conditionally permitted for non-expenable base metal sensor. It looks like non-expendable sensor is 'superior to' expendable sensor. When it comes to reuse, as listed in the table, the expendable base metal could be used subject to restriction of U formula (> 650 C), why non-expendable (supposed to be superior) could not be reused?
RE: Non-expendable K type test sensors for TUS as per AMS 2750E
The upper limit for K is much lower than most people are accustomed to using them at.
It clearly says that you are not allowed to re-calibrate K if used above 500F.
You have to read the rest of the details, but you can only use a K in protected environment up to 1200F once.
K's are simply a poor choice if you are going above 500F, and there are better options below that also.
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P.E. Metallurgy, Plymouth Tube
RE: Non-expendable K type test sensors for TUS as per AMS 2750E
Thanks again for your reply.
Yes, it says type K is not allowed to be re-calibrated if used above 500F, but that's for re-calibrate rather than re-use. I am checking about the re-use of K type as test sensors. It should be different from re-calibration (As you can see, for using of non-expendable base metal senors as load sensors, recalibration is not permitted, but re-use is limited by number of uses, temperature of use, and
calendar days since first use).
I am also agree that there are better choices for selecting other types. But if some suppliers already used K type sensors for TUS, should we say Yes or No? What's the justification from the requirement of AMS 2750 itself?
RE: Non-expendable K type test sensors for TUS as per AMS 2750E
Aidan McAllister
Metallurgical Engineer
RE: Non-expendable K type test sensors for TUS as per AMS 2750E
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P.E. Metallurgy, Plymouth Tube
RE: Non-expendable K type test sensors for TUS as per AMS 2750E
RE: Non-expendable K type test sensors for TUS as per AMS 2750E
can I ask you, from your personal experience, what type of thermocouple is the best choice (price, durability) for TUS on furnaces(up to 80 m3) with temperature range 250-1100°C?
And second one, where can you buy or get acces to that HT Pyrometry Guide?
Dalin
RE: Non-expendable K type test sensors for TUS as per AMS 2750E
Once you access eAuditnet, you can get to the Reference Guide through Resources > Documents > Public Documents > Heat Treating > Handbooks & Guides. It does have quite a lot of information in it regarding interpretations of AMS 2750 as well as a number of FAQs for common questions.
Aidan McAllister
Metallurgical Engineer
RE: Non-expendable K type test sensors for TUS as per AMS 2750E
RE: Non-expendable K type test sensors for TUS as per AMS 2750E
RE: Non-expendable K type test sensors for TUS as per AMS 2750E
This is clearly stated in section 3.1.3.3 for use of expendable TC. My question is what's about use of nonexpendable base metal TCs for TUS?
In section 3.1.5.3, it was mentioned for the life of nonexpandable base metal load TCs. But nowhere mentioning the test TCs.
It's quite confusing.
RE: Non-expendable K type test sensors for TUS as per AMS 2750E
Figure 1 of AMS2750 gives you the requirements for reuse and recalibration of TESTS and LOAD sensors. According to Figure 1
the reuse of non expendable TUS test sensors is 3.1.3.4 to 3.1.3.5
3.1.3.4 Any base metal TUS thermocouples used below 650 is limited to 90 uses or three years. From this I take that you cannot reuse any base metal thermocouple for TUS above 650 degrees celcius.
3.1.3.5 Non expendable base metal TUS thermocouples used under 650 degrees celcius shall be limited to no more than 90 uses or three years. Para 3.1.3.5 is applicable to TUS Test thermocouples and Para 3.1.5.3 is applicable to load thermocouples. From this it looks like you cannot reuse of base metal thermocouples used above 650 degrees Celsius.
RE: Non-expendable K type test sensors for TUS as per AMS 2750E
You might be right. But why is it not clearly stated as "Not permitted if used above 500F" as that for recalibration?
RE: Non-expendable K type test sensors for TUS as per AMS 2750E