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Temperature Calculators

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Secondary Standard Platinum Resistance Thermometer, PRT, Temperature Sensors - Models 5626 and 5628

Secondary Standard Temperature Sensors

Features

  • Range to 661°C
  • Meets all ITS-90 requirements for resistance ratios
  • Rtp drift < 20mK after 500 hours at 661°C
  • Clibrated accuracy of ± 0.006 °C at 0 °C

Specifications 

Temperature Range  –200 °C to 661 °C 
Handle Temp.  0 °C to 80 °C 
RTPW  5626: 100 W (± 1 W)
5628: 25.5 W (± 0.5 W) 
W(Ga)  ³ 1.11807 
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  Accreditated calibration from Fluke Hart Scientific 
†Includes calibration and 100 hr drift 

 

Hart’s high-temp secondary standards fill the gap between affordable, but temperature-limited secondary PRTs and more expensive, highly accurate SPRTs. 

If you’re using block calibrators, furnaces, or temperature points above normal PRT temperatures (420 °C), then these two PRTs are for you. The 5626 is nominally 100W and the 5628 is nominally 25.5W. 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, 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. Hart’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! 

Click here to view (in PDF format) a technical paper presented at NCSL 2000 on the Models 5626 and 5628 PRTs.

Ordering Information 

5626-12-X  High-temp PRT, 100W, 305 mm (12 in) 
5626-15-X  High-temp PRT, 100W, 381 mm (15 in) 
5626-20-X  High-temp PRT, 100W, 508 mm (20 in) 
5628-12-X  High-temp PRT, 25.5W, 305 mm (12 in) 
5628-15-X  High-temp PRT, 25.5W, 381 mm (15 in) 
5628-20-X  High-temp PRT, 25.5W, 508 mm (20 in) 
2609  Spare Case 
Appropriate case included with purchase of 5626 or 5628 PRT.

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).

Right click one of the following links and “Save Target As ...” to download the catalog pages/data sheet or a product User's Guide in Acrobat (.pdf)  format.

Catalog page(s)/data sheet
5626/5628 User's Guide

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