An e-newsletter published by Moore Industries Inc., North Hills, Calif., has some advice for anyone struggling with temperature stability in an industrial process.
To improve long-term stability of temperature measurement,
Moore offers the following suggestion: Start with a Class A four-wire RTD, but
pay attention to another critical selection criterion for RTDs - make sure they
have been thermally aged.
sensors the company uses in high accuracy applications have been
temperature-cycled from 32 to 1,112°F (0 to 600°C) for 1,000 hours, according
to Moore. The annealing makes them virtually drift-free for the next five to 10
years, the company says.