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Temperature Calculators

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Visit other Fluke companies for calibration equipment and services in electrical, power, pressure, flow, RF, and more.

Link to Fluke Calibration for electrical and power calibration

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5618B Small Diameter Industrial RTD

5618B Industrial RTDs with small diameter sensors for high speed in temperature measurement and calibration.

Features

  • 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 

Specifications 

Resistance  Nominal 100 W at 0 °C 
Temperature Coefficient  0.003923 W/W/ °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 Teflon, 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

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

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 Hart thermometer. If you are using a 1521 Handheld Thermometer readout, we’ll program the coefficients directly into your INFO-CON connector. 

The 5618B is also a great probe to use for calibrating your Hart 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 1521, 1522, 1502A, 1529, or 1560 thermometer readouts. 

Ordering Information 
5618B-12-X  305 mm (12 in) Small Diameter Probe 
5618B-9-X  229 mm (9 in) Small Diameter Probe 
5618B-6-X  152 mm (6 in) Small Diameter Probe 
2601  Probe Carrying 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). 

 

Downloads

Right click one of the following links and “Save Target As ...” to download the catalog pages/data sheet in Acrobat (.pdf)  format.

Catalog page(s)/data sheet

5618B Users Guide

 

 

  
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