R
robanbieber
The AMS 2750E Pryometry is quite complex and convoluted when it comes to sensor requirements and calibration do's and don't's . I am using some type K expendable sensors for my TUS and despite all the references to not being able to recalibrate them I do not see a requirement that they would need to be recalibrated after initial calibration unless they are damaged or the user has taken action after "ensuring that excessive drift has not occurred under the particular conditions (environment, time, and temperature) of exposure." section 3.1.2.3
From section 3.1.3.4
Any base metal TUS thermocouple that is (1) used exclusively under 1200 F (650 ?C), (2) identified, and (3) preserved/protected from damage (i.e., crimping, excessive moisture contact, corrosion, etc.) between tests orremains installed on a rack that is protected between tests,) shall be limited to no more than 90 uses or 3 years, whichever comes first and may be reused subject only to the limitations of 3.1.3.1 to 3.1.3.2.
It appears that I can use and reuse my type K expendable sensors for TUS at 500F or less as long as they are not damaged (3.1.3.1 and 3.1.3.2) and according to Fig 1 in the reuse column that I need to follow the U-formula at 3.1.3.3 and 3.1.3.4
So as I see it I can use my K expendable sensors for 30 uses (3.1.3.3 is the 30 restriction for expendable sensors) or "3 years, whichever comes first.." .
So if I have one oven that requires a TUS quarterly (one "use") I can pretty much expect my TUS sensors to last 3 years without having to be replaced OR recalibrated... and since they cannot be recalibrated I would just replace them.. of course if they are damaged per 3.1.3.2 before then they would have to be replaced before the time or use limit comes into effect.
Am I correct? This seems that I can actually justify that I do not have to or am not allowed to check/calibrate these sensors ever for 3 years!
I have attached the Fig 1 and the sensor cal table 1 with its accompanying notes...
From section 3.1.3.4
Any base metal TUS thermocouple that is (1) used exclusively under 1200 F (650 ?C), (2) identified, and (3) preserved/protected from damage (i.e., crimping, excessive moisture contact, corrosion, etc.) between tests orremains installed on a rack that is protected between tests,) shall be limited to no more than 90 uses or 3 years, whichever comes first and may be reused subject only to the limitations of 3.1.3.1 to 3.1.3.2.
It appears that I can use and reuse my type K expendable sensors for TUS at 500F or less as long as they are not damaged (3.1.3.1 and 3.1.3.2) and according to Fig 1 in the reuse column that I need to follow the U-formula at 3.1.3.3 and 3.1.3.4
So as I see it I can use my K expendable sensors for 30 uses (3.1.3.3 is the 30 restriction for expendable sensors) or "3 years, whichever comes first.." .
So if I have one oven that requires a TUS quarterly (one "use") I can pretty much expect my TUS sensors to last 3 years without having to be replaced OR recalibrated... and since they cannot be recalibrated I would just replace them.. of course if they are damaged per 3.1.3.2 before then they would have to be replaced before the time or use limit comes into effect.
Am I correct? This seems that I can actually justify that I do not have to or am not allowed to check/calibrate these sensors ever for 3 years!
I have attached the Fig 1 and the sensor cal table 1 with its accompanying notes...
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