5624 Platinum Resistance Thermometer to 1000 °C

We’re pleased to introduce the world’s finest high-temperature secondary PRT, our Model 5624.


5624 Platinum Resistance Thermometer with Temperature Range of 0 °C to 1000 °C

  • Temperature range of 0°C to 1000°C
  • Accuracy (includes short-term stability and calibration uncertainty) of ±0.05°C to 962°C
  • Long-term drift of 0.01°C at 0°C after 100 hours at 1000°C
  • Designed by Fluke Calibration’s primary standards design team
  • At Fluke Calibration, we receive many requests for precision PRT accuracy at thermocouple temperatures. Until now metrologist have settled for expensive, high-temperature SPRTs or inaccurate thermocouples for high-temperature measurement.We’re pleased to introduce the world’s finest high-temperature secondary PRT, our Model 5624.

The 5624 is ideal for use as a reference thermometer in high-temperature furnaces, the 5624 can reach a temperature of 1000°C with long-term drift at 0°C of 10 mK and accuracy (including short-term stability and calibration uncertainty over the full range) of 55 mK! Due to Fluke Calibration's proprietary sensor design, this PRT has short-term stability of 5 mK, and an immersion requirement of less than 153 mm (6") at 700°C.

The 5624 is assembled in an alumina sheath that is 508 mm (20") long and 6.35 mm (0.25") in diameter. Several termination configurations can be selected to match different thermometer readouts. Each 5624 comes with a NIST-traceable, NVLAP-accredited fixed-point calibration from 0°C to 962°C. That’s a fixed-point calibration! The 5624 also comes in a protective carrying case.




Range 0 °C to 1000 °C
Calibration Uncertainty ± 0.004 °C at 0 °C
± 0.020 °C at 962 °C
Long-term Drift (Rtpw) (k=2) <0.01 °C at 0 °C/100 hours at 1000 °C
<0.06 °C at 0 °C/1000 hours at 1000 °C
Calibrated Accuracy† (k=2) ± 0.006 °C at 0 °C
± 0.031 °C at 660 °C
± 0.041 °C at 961 °C
Short-term Stability ± 0.005 °C
Immersion <153 mm (6 in) at 700 °C
Rtpw 10 ohm (± 0.1 ohm)
Hysteresis <0.005 °C from 0 °C to 1000 °C
Thermocycling <0.01 °C, 10 cycles from 0 to 1000 °C
Current 1 mA
Size 6.35 mm (0.25 in) O.D.
Length 508 mm (20 in)
Sheath Material Alumina
Calibration Included 1913-6 fixed-point calibration
Includes calibration and 100 hr drift



Model Name


5624-20-X Probe, 1000°C, 10 ohm PRT, 6.35 mm x 508 mm (0.25" x 20"), (includes 2609 case)

X = termination. Specify “A" (INFO-CON for 914X),“B" (bare wire), “D" (5-pin DIN for Tweener Thermometers), “G" (gold pins), “I" (INFO-CON for 1521 or 1522), “J" (banana plugs), “L" (mini spade lugs), “M" (mini banana plugs), “P" (INFO-CON for 1523 or 1524), or “S" (spade lugs)

Accessories common to all models:



1913-6 Cal, SPRT by Fixed Point, 0
2609-5624 Case, SPRT, Plastic


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