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With a temperature range of -200°C to 420°C, the Fluke Calibration 5616 has a high-purity platinum element and a durable design making it ideal for calibrations done in the lab or out in the field.
Choosing a reference with a platinum element is predominately based on its short term repeatability and the long term drift. Just as in the process of a calibration, PRT’s are thermally cycled over their temperature range, as a result their resistance at the triple point of water can move up and down within an expected range. Fluke Calibration defines this range as the repeatability at the triple point of water during three thermal cycles; “short term repeatability”. With +/-0.004°C being typical, the Fluke Calibration 5616 executes a short term repeatability better than +/-0.010°C classifying it as a leading reference PRT. Just as crucial, the 5616 has a drift of +/-0.007°C at the triple point of water when exposed up to its maximum temperature of 420°C for 100 hours. These specification are given at k=2 and thus include a 95% confidence level.
The 5616 has a sealed – INCONEL 600 sheath that’s 298 mm (11.75 in) long and 6.35 mm (0.250 in) in diameter. Removing the effects of lead-wire resistance on measurements, the probe has a PTFE-jacketed cable made of silver plated copper that ends with four-wire leads. The 5615 can be used with Fluke Calibration’s 1502A Tweener thermometer readouts, 1523/1524 Handheld Reference Thermometer, 1569 Black Stack or 1529 Chub-E4.
| Parameter | Value | ||||||||||||||||||||
| Temperature range | −200 °C to 420 °C | ||||||||||||||||||||
| Nominal resistance at 0.01 °C | 100 Ω ± 0.5 Ω | ||||||||||||||||||||
| Temperature coefficient | 0.003925 Ω/Ω/°C nominal | ||||||||||||||||||||
| Calibrated Accuracy[1] (k=2) | ± 0.012 °C at −200 °C ± 0.011 °C at 0 °C ± 0.028 °C at 420 °C | ||||||||||||||||||||
| Short-term repeatability[2] | ± 0.007 °C at 0.010 °C | ||||||||||||||||||||
| Drift[3] | ± 0.007 °C at 0.010 °C | ||||||||||||||||||||
| Hysteresis | ± 0.010 °C maximum | ||||||||||||||||||||
| Sensor length | 50.8 mm (2.0 in) | ||||||||||||||||||||
| Sensor location | 9.5 mm ± 3.2 mm from tip (0.375 in ± 0.125 in) | ||||||||||||||||||||
| Sheath diameter tolerance | ± 0.08 mm (± 0.003 in) | ||||||||||||||||||||
| Sheath material | INCONEL® 600 | ||||||||||||||||||||
| Minimum insulation resistance | 500 MΩ at 23 °C | ||||||||||||||||||||
| Transition junction temperature range[4] | −50 °C to 150 °C (see footnote) | ||||||||||||||||||||
| Minimum immersion length[5] (< 5 mK error) | 102 mm (4.0 in) | ||||||||||||||||||||
| Maximum immersion length | 254 mm (10 in) | ||||||||||||||||||||
| Response time[5] | 8 seconds typical | ||||||||||||||||||||
| Self heating (in 0 °C bath) | 60 mΩ/°C | ||||||||||||||||||||
| Lead-wire cable type | PTFE-jacketed cable, PTFE insulated conductors, 24 AWG stranded, silver plated copper | ||||||||||||||||||||
| Lead-wire length | 182.9 cm ± 2.5 cm (72.0 in ± 1.0 in) | ||||||||||||||||||||
| Lead-wire temperature range | −50 °C to 150 °C | ||||||||||||||||||||
| Calibration | NIST-traceable calibration | ||||||||||||||||||||
| [1]Includes calibration uncertainty and 100 hr drift. [2]Three thermal cycles from min to max temp, includes hysteresis, 95 % confidence (k=2) [3]After 100 hrs at max temp, 95 % confidence (k=2) [4]Temperatures outside this range will cause irreparable damage. For best performance, transition junction should not be too hot to touch. [5]Per ASTM E 644 |
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