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Fluke 5618B-12-X Small Diameter Industrial RTD

Fluke authorised distributor and calibration house.

For secondary level performance with full ITS-90 calibration, Fluke Calibration’s 5618B series PRTs are an excellent choice for critical temperature measurements.

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Featuring a 3.2 mm diameter (1/8 in) sheath, these industrial standards probes have reduced response time without compromising precision. This small diameter 5618A probe works well in many applications where immersion depth is limited. Larger diameter probes give more measurement error in short immersion depth applications because they conduct more heat between ambient and the sensor.

The Fluke 5618B is also a great probe to use for calibrating your Fluke Calibration 9132 or 9133 infrared calibrators. In fact, these IR black body heat sources were designed to be calibrated with this type of probe. We recommend using the Fluke 5618B PRTs with the 1523, 1524, 1502A, 1529, or 1560 thermometer readouts.

Please Note: When ordering please specify the termination you require. ie. Fluke 5618B-12-G (gold pins).

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).


305 mm (12 in) Small Diameter Probe, lead wire (cable) 6 ft.
Small diameter sheath, 3.2mm (0.125 in).
Excellent stability.
Includes ITS-90 coefficients.
NVLAP-accredited calibrated from –200°C to 500°C, lab code 200706-0.

Fluke 5618-12 Specifications
Resistance Nominal 100 Ω at 0 °C.
0.003923 Ω/Ω/ °C nominal.
–200 °C to 500 °C
(–200 °C to 300 °C for 5618B-6-X).
Drift Rate ± 0.1 °C when used periodically to 500 °C.
Sheath Material 316 SST.
Leads 22 AWG PTFE, 6’.
Termination Specify.
Less than 0.01 °C at 0 °C when using –196 °C and 420 °C as the end points.
Time Constant
Four seconds maximum for 63.2 % response to step change in water moving at 3 fps.
Thermal EMF Less than 25 mV at 420 °C.
Includes manufacturer’s NVLAP-accredited calibration w/ITS-90 coefficients, R vs. T values in 1 °C increments, lab code 200706-0.
5618B-12: 305 mm L x 3.2 mm dia. (12 x 1/8 in)
5618B-9: 229 mm L x 3.2 mm dia. (9 x 1/8 in)
5618B-6: 152 mm L x 3.2 mm dia. (6 x 1/8 in)
Accuracy† (k=2)
± 0.026 °C at –200 °C
± 0.066 °C at 0 °C
± 0.219 °C at 500 °C.
uncertainty and
drift specification.

NVLAP† Calibration Uncertainty

Temperature Expanded
–196 °C 0.024 °C
–38 °C 0.011 °C
0 °C 0.010 °C
200 °C 0.018 °C
420 °C‡ 0.029 °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 200706-0 ‡300 °C for 5618B-6.


Fluke 5618B Datasheet

PDF Users Guide for the Fluke 5618B Small Diameter Industrial RTD.

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Fluke 5618B-12-X Small Diameter Industrial RTD

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