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LM135: LM135H military grade

Part Number: LM135

The reads on this temp probe is going from room temp which is about 22.8C to 75C. Once we hit 75C the temperature starts to read in a descending reads. All the way in the -200+C. On my conversions I have it as (Value*100)-273. This is all working until we hit that 75C max. Is there something I am doing wrong? I have 2 sensors and both are doing the same thing.