The Fluke Calibration 5616 Secondary Reference PRT (formerly Hart Scientific) has excellent short-term repeatability and
comes with an unaccredited NIST-traceable calibration.
The temperature range of the 5616 covers -328 to 788°F (-200 to 420°C), and its high-purity platinum element and durability
make it great for calibrating in the lab or in the field. When choosing a reference with a platinum element, there
are two things you want to look at carefully: the short-term repeatability and the long-term drift. When PRTs are
thermally cycled over their temperature range as they would be during a calibration, their resistance at the triple
point of water can move up and down within an expected range. Fluke Calibration defines this range (called "short-term
repeatability) as the repeatability at the triple point of water during three thermal cycles. 5616s are among the best
performing in their class with short-term repeatability better than ±0.010°C (± 0.004°C is typical). In addition, the
5616's drift is ±0.007 °C at the triple point of water when exposed up to its maximum temperature 788°F(420 °C) for 100 hours.
These specifications are given at k=2 and therefore include a 95 % confidence level.
The 5616's sealed INCONEL® 600 sheath is 298 mm (11.75 in) long and 6.35 mm (0.250 in) in diameter. The probe's PTFE-jacketed
cable is made of silver plated copper that ends with four-wire leads, which eliminate the effects of lead-wire resistance on
measurements. Use the 5616 with Fluke Calibration's 1523/1524 Handheld Reference Thermometer, 1560 Black Stack, 1529 Chub-E4,
or 1502A Tweener thermometer readouts.
Each sensor comes with a manufacturer's report of calibration. The report includes the expanded uncertainty (k=2) at seven
calibration temperature points, ITS-90 calibration coefficients, and a temperature vs. resistance table presented in 1°C
increments. Compare the 5616 to other Secondary Reference PRTs. You'll like its price, but you'll love its performance.
