Fluke 5626, 5628 | Secondary Standard PRTs

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Product overview: 5626, 5628 | Secondary Standard PRTs

If you’re using block calibrators, furnaces, or temperature points above normal PRT (platinum resistance thermometer) temperatures (420 °C), then these two PRTs are for you. The Fluke 5626 is nominally 100 Ω and the 5628 (formerly Hart Scientific) is nominally 25.5 Ω. Both instruments have a temperature range of –200 °C to 661 °C. They make great working or check standards for calibration work up to the aluminum point.

Using a regular PRT at temperatures above 500 °C exposes the platinum to contamination. If the PRT is used as a reference or calibration standard, contamination is a major problem. SPRTs (standard platinum resistance thermometers), which are more expensive and delicate, can handle the higher temperatures, but with greater risk to the instrument due to shock, contamination, or mishandling. The 5626 and 5628 are designed to reduce the contamination risk through the use of internal protection while not impairing performance.

In addition to the right measurement performance and durability, a PRT for secondary applications should be priced affordably. Fluke Calibration’s new PRTs are inexpensive and come with an accredited calibration. The calibration comes complete with ITS-90 constants and a resistance-versus-temperature table.

Check the temperature range, check the stability, check the price! Who else gives you this much quality, performance, and value for your money? No one!

Key Features

  • Designed for high-temperature applications, up to 661°C.
  • Meet all ITS-90 requirements for resistance ratios.
  • Exhibit an Rtp drift of less than 20 mK after 500 hours at 661°C.
  • Calibrated accuracy of ± 0.006 °C at 0 °C.

Specifications: 5626, 5628 | Secondary Standard PRTs

Specifications 
Temperature Range  –200 °C to 661 °C 
Handle Temp.  0 °C to 80 °C 
RTPW  5626: 100 Ω (± 1 Ω)
5628: 25.5 Ω (± 0.5 Ω) 
Resistance Ratio W(Ga) W(302.9146K) ≥ 1.11807
α ≥ 0.003925
Calibrated Accuracy† (k=2)  ± 0.006 °C at –200 °C
± 0.006 °C at 0 °C
± 0.015 °C at 420 °C
± 0.022 °C at 661 °C 

Stability 		 5626: ± 0.003 °C
5628: ± 0.002 °C 
Long-Term Drift (k=2)  5626:  < 0.006 °C/100 hours at 661 °C
5628: < 0.004 °C/100 hours at 661 °C 
Immersion  At least 12.7 cm (5 in) recommended 
Sheath  Inconel™ 600 
Lead Wires  4-wire Super-Flex PVC, 22 AGW 
Termination  Gold-plated spade lugs, or specify 
Size  6.35 mm dia. x 305 mm,  381 mm,  or 508 mm (0.25 x 12, 15, or 20 in) standard, custom lengths available 
Calibration  Accredited calibrations from Fluke Calibration
†Includes calibration and 100 hr drift

Includes calibration and 100 hr drift

Includes calibration and 100 hr drift

Product overview: 5626, 5628 | Secondary Standard PRTs

If you’re using block calibrators, furnaces, or temperature points above normal PRT (platinum resistance thermometer) temperatures (420 °C), then these two PRTs are for you. The Fluke 5626 is nominally 100 Ω and the 5628 (formerly Hart Scientific) is nominally 25.5 Ω. Both instruments have a temperature range of –200 °C to 661 °C. They make great working or check standards for calibration work up to the aluminum point.

Using a regular PRT at temperatures above 500 °C exposes the platinum to contamination. If the PRT is used as a reference or calibration standard, contamination is a major problem. SPRTs (standard platinum resistance thermometers), which are more expensive and delicate, can handle the higher temperatures, but with greater risk to the instrument due to shock, contamination, or mishandling. The 5626 and 5628 are designed to reduce the contamination risk through the use of internal protection while not impairing performance.

In addition to the right measurement performance and durability, a PRT for secondary applications should be priced affordably. Fluke Calibration’s new PRTs are inexpensive and come with an accredited calibration. The calibration comes complete with ITS-90 constants and a resistance-versus-temperature table.

Check the temperature range, check the stability, check the price! Who else gives you this much quality, performance, and value for your money? No one!

Key Features

  • Designed for high-temperature applications, up to 661°C.
  • Meet all ITS-90 requirements for resistance ratios.
  • Exhibit an Rtp drift of less than 20 mK after 500 hours at 661°C.
  • Calibrated accuracy of ± 0.006 °C at 0 °C.

Specifications: 5626, 5628 | Secondary Standard PRTs

Specifications 
Temperature Range  –200 °C to 661 °C 
Handle Temp.  0 °C to 80 °C 
RTPW  5626: 100 Ω (± 1 Ω)
5628: 25.5 Ω (± 0.5 Ω) 
Resistance Ratio W(Ga) W(302.9146K) ≥ 1.11807
α ≥ 0.003925
Calibrated Accuracy† (k=2)  ± 0.006 °C at –200 °C
± 0.006 °C at 0 °C
± 0.015 °C at 420 °C
± 0.022 °C at 661 °C 

Stability 		 5626: ± 0.003 °C
5628: ± 0.002 °C 
Long-Term Drift (k=2)  5626:  < 0.006 °C/100 hours at 661 °C
5628: < 0.004 °C/100 hours at 661 °C 
Immersion  At least 12.7 cm (5 in) recommended 
Sheath  Inconel™ 600 
Lead Wires  4-wire Super-Flex PVC, 22 AGW 
Termination  Gold-plated spade lugs, or specify 
Size  6.35 mm dia. x 305 mm,  381 mm,  or 508 mm (0.25 x 12, 15, or 20 in) standard, custom lengths available 
Calibration  Accredited calibrations from Fluke Calibration
†Includes calibration and 100 hr drift

Includes calibration and 100 hr drift

Includes calibration and 100 hr drift

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