Hart Scientific 5608 and 5609
Secondary PRT with Calibration Options

5608: –200 °C to 500 °C (80mm minimum immersion)
5609: –200 °C to 670 °C (100mm minimum immersion)
± 0.01 short-term stability
Calibration not included, NVLAP-accredited calibration optional, lab code 200348-0
Dry-well reference with 90 ° bend
The 5608 comes with a one-eighth inch (3.18mm) diameter sheath in lengths of 9 inches or 12 inches
The 5609 comes with a one-quarter inch (6.35 mm) diameter sheath in lengths of 12 inches, 15 inches, and 20 inches

Fluke HART 5608
and 5609 Shown

Product Information
Datasheet	335 KB
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If you want a very stable thermometer from –200 °C to 670 °C and are particular about the calibration, then look no further than our 5609 Secondary Reference PRT. Its short-term stability at the triple point of water is only ±10mK and its one-quarter inch (6.23 mm) diameter lets you get accurate measurements in only 100 mm of immersion. The 5608 is also a ±10mK probe at the triple point of water, but its one-eighth inch (3.18 mm) diameter gets you accurate measurements from –200 °C to 500 °C with only 80 mm (3.1 in) of immersion. With multiple sheath length options on both of these probes, and an optional 90 ° bend at nine inches from the tip for dry-well applications, you can find the dimensions that are just right for your specific application.

The 5608 comes with a one-eighth inch (3.18 mm) diameter sheath in lengths of 9 inches or 12 inches. The 5609 comes with a one-quarter inch (6.35mm) diameter sheath in lengths of 12 inches, 15 inches, and 20 inches; or with a 6 mm diameter in lengths of 300mm, 400mm, or 500mm.

Both of these probes have Inconel™ sheaths and are made using a special manufacturing process, giving them great precision over a wide temperature range. The sensors for these probes are reference-grade platinum and feature four-wire connections with less noisy measurements than two-wire counterparts.

Specifications
Temperature Range	5608: –200 °C to 500 °C
	5609: –200 °C to 670 °C
Nominal Resistance at 0.01°C	100 Ω ± 0.5 Ω
Temperature Coefficient	0.0039250 Ω/Ω/°C
Accuracy	Short-term Repeatability	± 0.01 °C at 0.010 °C
		± 0.02 °C at max temp
	Drift	± 0.01 °C at 0.010 °C
		± 0.02 °C at max temp
	Hysteresis	± 0.01 °C maximum
Sensor Length	30 mm ± 5 mm (1.2 in ± 0.2 in)
Sensor Location	3 mm ± 1 mm from tip (0.1 in ± 0.1 in)
Sheath Material	Inconel™ 600
Minimum Insulation Resistance	5608: 500 MW at 23 °C, 20 MW at 500 °C
	5609: 500 MW at 23 °C, 10 MW at 670 °C
Transition Junction Dimensions	71 mm x 12.5 mm (2.8 in x 0.49 in)
Minimum Immersion Length (<5 mK error)	5608: 80 mm (3.1 in)
	5609: 100 mm (3.9 in)
Maximum Immersion Length	305 mm (12 in)
Response Time	5608: 9 seconds typical
	5609: 12 seconds typical
Self Heating (in 0°C bath)	5608: 75 mW/°C
	5609: 50 mW/°C
Lead-wire Cable Type	Teflon,™ 24 AWG
Lead-wire Length	1.8 m (6 ft)
Lead-wire Temperature Range	–50 °C to 250 °C

Ordering Information
Model	Size Length x Diameter	Type	Temp. Range	Buy	Price
56089B	9 in x 1/8 in	Bare Wire	–200 to 500 °C		$555.00
56089D	9 in x 1/8 in	5-pin DIN for Tweener Thermometers	–200 to 500 °C		$555.00
56089I	9 in x 1/8 in	INFO-CON for 1521/1522	–200 to 500 °C		$555.00
56089L	9 in x 1/8 in	Miniature Spade Lugs	–200 to 500 °C		$555.00
56089S	9 in x 1/8 in	Standard Spade Lugs	–200 to 500 °C		$555.00
560812B	12 in x 1/8 in	Bare Wire	–200 to 500 °C		$555.00
560812D	12 in x 1/8 in	5-pin DIN for Tweener Thermometers	–200 to 500 °C		$555.00
560812I	12 in x 1/8 in	INFO-CON for 1521/1522	–200 to 500 °C		$555.00
560812L	12 in x 1/8 in	Miniature Spade Lugs	–200 to 500 °C		$555.00
560812S	12 in x 1/8 in	Standard Spade Lugs	–200 to 500 °C		$555.00
560912A	12 in x 1/4 in	Base Model	–200 to 670 °C		$735.00
560912B	12 in x 1/4 in	Bare Wire	–200 to 670 °C		$735.00
560912D	12 in x 1/4 in	5-pin DIN for Tweener Thermometers	–200 to 670 °C		$735.00
560912I	12 in x 1/4 in	INFO-CON for 1521/1522	–200 to 670 °C		$735.00
560912L	12 in x 1/4 in	Miniature Spade Lugs	–200 to 670 °C		$735.00
560912S	12 in x 1/4 in	Standard Spade Lugs	–200 to 670 °C		$735.00
560915A	15 in x 1/4 in	Base Model	–200 to 670 °C		$815.00
560915B	15 in x 1/4 in	Bare Wire	–200 to 670 °C		$815.00
560915D	15 in x 1/4 in	5-pin DIN for Tweener Thermometers	–200 to 670 °C		$815.00
560915I	15 in x 1/4 in	INFO-CON for 1521/1522	–200 to 670 °C		$815.00
560915L	15 in x 1/4 in	Miniature Spade Lugs	–200 to 670 °C		$815.00
560915S	15 in x 1/4 in	Standard Spade Lugs	–200 to 670 °C		$815.00
560920A	20 in x 1/4 in	Base Model	–200 to 670 °C		$920.00
560920B	20 in x 1/4 in	Bare Wire	–200 to 670 °C		$920.00
560920D	20 in x 1/4 in	5-pin DIN for Tweener Thermometers	–200 to 670 °C		$920.00
560920I	20 in x 1/4 in	INFO-CON for 1521/1522	–200 to 670 °C		$920.00
560920L	20 in x 1/4 in	Miniature Spade Lugs	–200 to 670 °C		$920.00
560920S	20 in x 1/4 in	Standard Spade Lugs	–200 to 670 °C		$920.00
56099BND	15 in x 1/4 in; 9 in bend	90° Bend for Dry-Well Applications	–200 to 670 °C		$834.00
Optional Accessories
2601	Fluke Hart 2601 Probe Carrying Case (for probes ending in: -9 and -12)				$90.00

Hart Scientific 5608 and 5609 Secondary PRT with Calibration Options

Hart Scientific 5608 and 5609
Secondary PRT with Calibration Options