5626, 5628 Secondary Standard PRTs

High-temperature secondary standards

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

Fluke Calibration's high-temp secondary standards fill the gap between affordable, but temperature-limited secondary PRTs (platinum resistance thermometers) and more expensive, highly accurate SPRTs (standard platinum resistance thermometers).

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!

Specifications
Temperature Range	–200 °C to 661 °C
Handle Temp.	0 °C to 80 °C
R_TPW	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

Model Name	Description
5626-12-X	Secondary Standard PRT (0.25 in dia x 12 in), 100 Ω, –200 °C to 661 °C (17025 accredited calibration included. Traceable to NIST standards.) X = termination. Specify “A" (INFO-CON for 914X), “B" (bare wire), “D" (5-pin DIN for Tweener Thermometers), “G" (gold pins), “J" (banana plugs), “L" (mini spade lugs), “M" (mini banana plugs), “P" (INFO-CON for 1523 or 1524), or “S" (spade lugs).
5626-15-X	Secondary Standard PRT (0.25 in dia x 15 in), 100 Ω, –200 °C to 661 °C (17025 accredited calibration included. Traceable to NIST standards.) X = termination. Specify “A" (INFO-CON for 914X), “B" (bare wire), “D" (5-pin DIN for Tweener Thermometers), “G" (gold pins), “J" (banana plugs), “L" (mini spade lugs), “M" (mini banana plugs), “P" (INFO-CON for 1523 or 1524), or “S" (spade lugs).
5626-20-X	High-temp PRT, 100 Ω, 508 mm (20 in) Includes case (17025 accredited calibration included. Traceable to NIST standards.) X = termination. Specify “A" (INFO-CON for 914X), “B" (bare wire), “D" (5-pin DIN for Tweener Thermometers), “G" (gold pins), “J" (banana plugs), “L" (mini spade lugs), “M" (mini banana plugs), “P" (INFO-CON for 1523 or 1524), or “S" (spade lugs).
5628-12-X	Secondary Standard PRT (0.25 in dia x 12 in), 25.5 Ω, –200 °C to 661 °C (17025 accredited calibration included. Traceable to NIST standards.) X = termination. Specify “A" (INFO-CON for 914X), “B" (bare wire), “D" (5-pin DIN for Tweener Thermometers), “G" (gold pins), “J" (banana plugs), “L" (mini spade lugs), “M" (mini banana plugs), “P" (INFO-CON for 1523 or 1524), or “S" (spade lugs).
5628-15-X	Secondary Standard PRT (0.25 in dia x 15 in), 25.5 Ω, –200 °C to 661 °C (17025 accredited calibration included. Traceable to NIST standards.) X = termination. Specify “A" (INFO-CON for 914X), “B" (bare wire), “D" (5-pin DIN for Tweener Thermometers), “G" (gold pins), “J" (banana plugs), “L" (mini spade lugs), “M" (mini banana plugs), “P" (INFO-CON for 1523 or 1524), or “S" (spade lugs).
5628-20-X	High-temp PRT, 25.5 Ω, 508 mm (20 in) Includes case (17025 accredited calibration included. Traceable to NIST standards.) X = termination. Specify “A" (INFO-CON for 914X), “B" (bare wire), “D" (5-pin DIN for Tweener Thermometers), “G" (gold pins), “J" (banana plugs), “L" (mini spade lugs), “M" (mini banana plugs), “P" (INFO-CON for 1523 or 1524), or “S" (spade lugs).

Accessories common to all models:

Accessory	Description
2609	Probe Carrying Case, Plastic (for probes 635 mm [25 in] in length)

Product Manuals
5626/5628 Platinum Resistance Thermometer User’s Guide (438.46 KB)
5626/5628 Platinum Resistance Thermometer User’s Guide (rus) (507.61 KB)

Application Notes
Calculating Calibration Uncertainties in an Automated Temperature Calibration System (426.88 KB)
Establishment of a Secondary Temperature Calibration Laboratory (3.09 MB)
How to Calibrate an RTD or Platinum Resistance Thermometer (PRT) (652.16 KB)
Kalibrieren eines RTD oder Platin-Widerstandsthermometers (PRT) (German) (828.03 KB)
Comment étalonner unde sonde RTD ou sonde à résistance de platine (PRT) (French) (834.22 KB)
Cómo calibrar una RTD o un sensor de temperatura (Spanish) (819.7 KB)
English: Thermocouple App Notes Series, 2 of 4 - How to Select Thermocouple Calibration Equipment (2.51 MB)
German: Thermocouple App Notes Series, 2 of 4 - Auswahl von Geräten zur Kalibrierung von Thermoelementen (2.21 MB)
French: Thermocouple App Notes Series, 2 of 4 - Guide de sélection d'équipement d'étalonnage de thermocouple (2.21 MB)
Russian: Thermocouple App Notes Series, 2 of 4 - Как выбрать оборудование для калибровки термопары (2.26 MB)
Spanish: Thermocouple App Notes Series, 2 of 4 - Cómo elegir un equipo de calibración de termopares (2.21 MB)
Industrial temperature readout and probe selection guide (1.06 MB)
Temperature Calibration Equipment: A Technician's Guide (1.62 MB)
Temperature measurement and calibration: What every instrument technician should know (1.65 MB)
Temperaturmessung und -kalibrierung (German) (650.54 KB)
Mesure et étalonnage thermique (French) (655.57 KB)
Medición y calibración de temperatura (Spanish) (651.42 KB)
English: Thermocouple App Notes Series, 1 of 4 - Thermocouple Fundamentals (2.5 MB)
Korean: 열전대 응용시리즈 첫번째 - 열전대의 기본사항 (2.28 MB)
German: Thermocouple App Notes Series, 1 of 4 - Grundlagen zu Thermoelementen (2.22 MB)
French: Thermocouple App Notes Series, 1 of 4 - L'essentiel des thermocouples (2.22 MB)
Spanish: Thermocouple App Notes Series, 1 of 4 - Nociones básicas de los termopares (2.22 MB)
Russian: Thermocouple App Notes Series, 1 of 4 - Основные сведения о термопаре (2.29 MB)
Why Use a Triple Point of Water? (1.19 MB)
Does Immersion Depth Really Matter? (745.44 KB)

Papers / Articles
A High-Quality Platinum Resistance Thermometer to 661°C (85.57 KB)
An Investigation of Long-Term Stability of a Precision Platinum Resistance Thermometer up to 660°C (164.52 KB)
Fixed Points for Secondary Level and Industrial Calibration (496.68 KB)
Fixed Points for Secondary Level Calibrations (560.12 KB)
I Just Got My Probe Recalibrated, Now What?
Improving the Stability of Standard Platinum Resistance Thermometers (207.37 KB)
Methods for Evaluating the Condition of Platinum Resistance Thermometers (130.23 KB)
Platinum Resistance Thermometers (PRT)
Proper Platinum Resistance Thermometer Calibration Uncertainty Analysis (351.32 KB)
Using a Mini Triple Point of Water System to Improve Reliability in a Temperature Calibration Laboratory (177.86 KB)
Why did my temperature sensor fail calibration?

On-Demand Webinars
Overcoming Drift: Tips to Maintaining Your PRTs

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5626, 5628 Secondary Standard PRTs

High-temperature secondary standards

Specifications

Accessories common to all models:

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5626, 5628 Secondary Standard PRTs

High-temperature secondary standards

Specifications

Accessories common to all models:

Sidebar Request a Quote

Secondary menu