Fluke 5618B Small Diameter Industrial RTD

With each probe you will receive a full NVLAP-accredited calibration report. On the report you’ll get the test data and the ITS-90 calibration coefficients that you can easily input into your Fluke Calibration thermometer.

The 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. Now you can calibrate these targets in your own lab!

For use from –200 °C to 500 °C (the six-inch model goes to 300 °C), you won’t find a better industrial standard in this configuration than our 5618B. We recommend using the 5618B PRTs with the 1523, 1524, 1502A, 1529, or 1560 thermometer readouts.

Key Features: Fluke 5618B Small Diameter Industrial RTD

Secondary level performance with full ITS-90 calibration.
Sheath diameter of 3.2mm (0.125 in), ensuring reduced response time without compromising precision.
NVLAP-accredited calibration from -200°C to 500°C, lab code 200706-0.
Reduced measurement error in short immersion depth applications by conducting less heat between ambient and the sensor.

Specifications: 5618B Small Diameter Industrial RTD

Specifications

Resistance

Nominal 100 Ω at 0 °C

Temperature
Coefficient

0.003923 Ω/Ω/ °C nominal

Temperature
Range

–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

Hysteresis

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

Calibration

Includes manufacturer’s NVLAP-accredited
calibration w/ITS-90 coefficients, R vs. T values in
1 °C increments, lab code 200706-0

Size

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)

Calibrated
Accuracy† (k=2)

± 0.026 °C at –200 °C
± 0.066 °C at 0 °C
± 0.219 °C at 500 °C

†Includes
calibration
uncertainty and
drift specification.

NVLAP† Calibration Uncertainty
Temperature	Expanded Uncertainty (k=2)
–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