| Fluke 5608/5609 Specification |
| Temperature range |
5608: –200 °C to 500 °C
5609: –200 °C to 670 °C |
| Nominal resistance at 0.01 °C |
100 Ω ± 0.5 Ω |
| Temperature coefficient |
0.0039250 Ω/Ω/°C |
| Relative Accuracy[1] |
± 0.007 °C at –200 °C
± 0.008 °C at 0 °C
± 0.020 °C at 420 °C
± 0.027 °C at 660 °C |
| Short-term repeatability[2] |
± 0.007 °C at 0.010 °C
± 0.013 °C at max temp |
| Drift[3] |
± 0.01 °C at 0.010 °C
± 0.02 °C at max temp |
| Hysteresis |
± 0.01 °C maximum |
| Sensor length |
30 mm ± 5 mm (1.2 in ± 0.2 in) |
| Sensor location |
3 mm ± 1 mm from tip (0.1 in ± 0.1 in) |
| Sheath material |
Inconel™ 600 |
| Minimum insulation resistance |
5608: 500 MΩ at 23 °C, 20 MΩ at 500 °C
5609: 500 MΩ at 23 °C, 10 MΩ at 670 °C |
Transition junction
temperature range[4] |
–50 ºC to 200 °C |
| Transition junction dimensions |
71 mm x 12.5 mm (2.8 in x 0.49 in) |
Minimum immersion length[5]
(<5 mK error) |
5608: 80 mm (3.1 in)
5609: 100 mm (3.9 in) |
| Maximum immersion length |
305 mm (12 in) |
| Response time[5] |
5608: 9 seconds typical
5609: 12 seconds typical |
| Self heating (in 0 °C bath) |
5608: 75 mW/°C
5609: 50 mW/°C |
| Lead-wire cable type |
PTFE 24 AWG |
| Lead-wire length |
1.8 m (6 ft) |
| Lead-wire temperature range |
–50 °C to 250 °C |
| Calibration |
Calibration not included; NVLAP-accredited calibration optional, lab
code 200348-0. Please see calibration uncertainty table and its
explanation of changeable uncertainties. |
[1] Includes short-term
repeatability and 100 hr drift.
Calibration will add additional
uncertainties.
[2] Three thermal cycles from min
to max temp, includes hysteresis,
95 % confidence (k=2)
[3]After 100 hours 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 |
Calibration Uncertainty for optional NVLAP-accredited†
calibration |
| Temperature range |
Expanded Uncertainty (k=2) |
| –200 °C |
0.025 °C |
| –100 °C |
0.025 °C |
| –40 °C |
0.025 °C |
| 0 °C |
0.025 °C |
| 156 °C |
0.025 °C |
| 230 °C |
0.030 °C |
| 420 °C |
0.045 °C |
| 660 °C |
0.050 °C |
Note: Calibration uncertainties depend on the uncertainties of
the lab performing the calibration. Subsequent calibrations of
this probe performed with different processes, at different
facilities, or with changed uncertainty statements may state
different uncertainties. †Lab code 200348-0 |
|