Fluke Calibration

5640 Series Thermistor Standards Probes

Rugged, high-accuracy temperature thermistor probe with excellent stability

Starting At
$2,975.00 CAD
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Thermistor standards are rugged, precision temperature sensors suitable for use as secondary or working temperature standards for laboratory metrology applications. Because they generally are not affected by shock and vibration, you can use them in the most difficult field environments without worrying about calibration integrity.

If you want a high-accuracy temperature thermistor probe with excellent stability at a great price, the Model 5640 series Thermistor Standards Probes give you all three in a great package. Why pay for an SPRT when you can get +/- 0.001°C accuracy from 0°C - 60°C in a calibrated thermistor probe for about one-third the cost of an uncalibrated SPRT alone?

The 5640, 5641, and 5642 thermistor probes are designed for the temperature range of 0°C - 60°C. The 5643 and 5644 probes span the 0°C to 100°C temperature range. They offer stability of either +/- 0.002°C or +/- 0.005°C. These stability levels are guaranteed for one full year.

Each temperature thermistor probe uses an ultra-stable glass thermistor enclosed in a thin-wall stainless steel tube. The basic semiconductor element is a bead of manganese, nickel, and cobalt oxides mounted on 0.1 mm platinum wires. For long-term stability, the thermistor is aged at various temperatures for 16 weeks. During the aging process, verification of the probe’s stability is done to ensure performance to published specs.

Each temperature thermistor probe is individually calibrated and includes a report of calibration from the manufacturer. Contact Fluke Calibration for calibration in our NVLAP accredited lab.

 • Accuracy to +/- 0.001°C
 • Affordable system accuracy to +/- 0.004°C or better
 • NIST-traceable calibration included from manufacturer

Thermistor Specifications

Model 

Diameter x Length

Range

Drift
 (°C /Year)

Accuracy (Mfr.)
 0–60  °C                      60–100 °C

Wires

Nominal Resistance
at 25 °C

5640 

6.35 mm x 229 mm
(0.25 in x 9 in)

0°C - 60°C

+/- 0.005 °C

+/- 0.0015 °C

N/A

4

4.4 kΩ

5641 

3.18 mm x 114 mm
(0.125 in x 4.5 in)

0°C - 60°C

+/- 0.002 °C

+/- 0.001 °C

N/A

4

5 kΩ

5642 

3.18 mm x 229 mm
(0.125 in x 9 in)

0°C - 60°C

+/- 0.002 °C

+/- 0.001 °C

N/A

4

4 kΩ

5643 

3.18 mm x 114 mm
(0.125 in x 4.5 in)

0°C - 100°C

+/- 0.005 °C

+/- 0.0015 °C

+/- 0.0025 °C

4

7.5 kΩ

5644 

3.18 mm x 229 mm
(0.125 in x 9 in)

0°C - 100°C

+/- 0.005 °C

+/- 0.0015 °C

+/- 0.0025 °C

4

7.5 kΩ

 

 

Does not include long-term drift, resistance traceability adds additional ± 0.0025 %.

 

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