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Determining SAT Offsets vs TUS Offsets per SAE AMS 2750E

#1
SAE AMS 2750E Table 6, indicates that both SAT offsets and TUS offsets can be associated with a furnace and treated seperately from each other. My confusion is with how an SAT offset is determined and what offsets remain present during production use of the furnace.

Our facility has been programming TUS offsets into our controllers, normally to keep the center of the work zone as accurate as possible, and subtracting these from our SAT measurements, along with the test instrument and test sensor correction factors, for a long time without much issue. However, we have never incorporated a seperate SAT offset to allow a furnace with an SAT Difference just outside of the +/-5 deg F tolerance for Furnace Class 5 to pass.

For example, say an SAT is performed on a Class 5 furnace and the SAT Difference is found to be -6.5 deg F, after subtracting the TUS offset and Test Instrument and Test Sensor correction factors. Table 6 indicates that a +/-13 deg F SAT offset is allowed. Is SAE AMS 2750E saying that our facility can decide to put an additional +1.5 deg F (or greater) "SAT offset" into the controller to get the SAT Difference within the allowable +/-5 deg F?

If so, does the SAT offset remain in the controller during normal production use, as the TUS offset does? I.e. if the TUS offset was previously determined to be -3 deg F, would the controller now be operating with a -1.5 deg F total offset during normal production use? Or, would it instead be acceptable to designate half (or all) of the -3 deg TUS offset we were using as an SAT offset to end up with the same furnace uniformity, and also a valid Class 5 SAT Difference?

Any information that can be provided will be greatly appreciated. Thank you.
 
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