Hart Scientific 5615
Secondary Reference Temperature Standards

Affordable wide-range accuracy
Excellent stability
Reference-grade platinum sensing element
NVLAP accredited calibration included

For years, you've relied on Hart's 5612, 5613, and 5614 Secondary Reference Probes. These field-durable, lab-accurate PRTs have been replaced by the 5615, which comes with a NVLAP accredited calibration.

5615-12, 5615-9
& 5615-6 Shown

Product Information
Datasheet	131 KB
Ordering Info
PDF Help

The 5615-12 is a Platinum Resistance Thermometer (PRT) with an Inconel™ 600 sheath that's 305 mm (12") long and 6.35 mm (0.250") in diameter. It is a secondary reference temperature standard designed to bridge the gap between the highest laboratory standards and industrial or second-tier lab locations. It has short-term accuracy of ±0.013 °C at 0.01 °C.

The element is constructed of reference-grade platinum wire (99.999 % pure) for excellent stability. The wire is wound in a coil and placed in a mandrel where it's uniformly supported in a manner that virtually eliminates hysteresis. The electrical configuration is a four-wire current-potential hookup that eliminate the effects of lead-wire resistance.

These Inconel™-sheathed probes have a fully supported sensing element, making them more durable than SPRTs. The element is protected in an ultrahigh-purity ceramic case with a hermetic glass seal to improve output stability by locking out moisture and contaminants.

This probe comes calibrated with ITS-90 coefficients, making it compatible with many excellent readout devices, including Hart's 1529 Chub-E4, 1560 Black Stack, and 1502A Tweener. It bridges the gap between a 100-ohm industrial RTD and an SPRT.

For those needing faster thermal response, or where diameter and immersion depth are problems, order the 5615-9 or 5615-6. These probes are excellent reference probes for comparison calibrations in a Hart dry-well. The sheaths of the 5615-6 and 5615-9 are 4.76 mm (0.188") in diameter.

A printout of sensor resistance is provided in 1 °C increments for each probe. The 5615-9 and 5615-12 are calibrated from -196 °C to 420 °C. The 5615-6 is calibrated to 300 °C.

We've tested many of the probes on the market. Hart used them in their manufacturing facility and tested them in the lab, and this is an excellent secondary standards PRT. Other instruments on the market are priced much higher, have lower stability, or are of lower quality.

Remember, these are reliable instruments and each probe comes with its own individual NVLAP-accredited calibration, lab code 200706-0.

Specifications

Temperature range

5615-12 and 5615-9: -200 °C to 420 °C
5615-6: -200 °C to 300 °C

Nominal resistance at 0 °C

100 W ± 0.10 W

Temperature coefficient

0.0039250 W/W/°C

Accuracy[1]

See footnote

Short-term repeatability^[2]

±0.013 °C at 0.010 °C

Drift^[3]

±0.01 °C at 0.010 °C

Sensor length

28 mm (1.1")

Sensor location

6.9 mm ± 3.3 mm from tip (0.27" ± 0.13")

Sheath diameter tolerance

±0.127 mm (±0.005")

Sheath material

Inconel™ 600

Minimum insulation resistance

1000 MW at 23 °C

Transition junction temperature range^[4]

-50 °C to 200 °C

Transition junction dimensions

71 mm x 13 mm dia (2.8" x 0.5")

Maximum immersion length

5615-6: 102 mm (4")
5615-9: 178 mm (7")
5615-12: 254 mm (10")

Response time^[5]

9 seconds typical

Self heating (in 0 °C bath)

50 mW/°C

Lead-wire cable type

Teflon™ insulated with Teflon™ jacket, 22 AWG

Lead-wire length

183 cm (72")

Lead-wire temperature range

-50 °C to 200 °C

Calibration

NVLAP-accredited calibration included, lab code 200706-0. Please see calibration uncertainty table and its explanation of changeable uncertainties.

NVLAP^† Calibration Uncertainty
Temperature	Expanded Uncertainty (k=2)
-196 °C	0.024 °C
-38 °C	0.011 °C
0 °C	0.010 °C
200 °C	0.018 °C
420 °C^‡	0.029 °C
Note: Calibration uncertainties depend on the uncertainties of the lab performing the calibration. Subsequent calibrations of this probe performed with different processes, at different facilities, or with changed uncertainty statements may state different uncertainties. ^†Lab code 200706-0 ^‡5615-6 excluded

^[1]"Accuracy" is a difficult term when used to describe a resistance thermometer. The simplest way to derive "accuracy" is to combine the probe drift specification and calibration uncertainty with readout accuracy at a given temperature.

^[2]Three thermal cycles from min to max temp, includes hysteresis, 99.9 % confidence

^[3]After 100 hrs at max temp, 99.9 % confidence

^[4]Temperatures outside this range will cause irreparable damage. For best performance, transition junction should not be too hot to touch. ^[5]Per ASTM E 644

Ordering Information
Model	Size Length x Diameter	Type	Temp. Range	Buy	Price
561512B	12 x 1/4" Dia.	Bare Wire	-200 to 420°C		$950.00
561512D	12 x 1/4" Dia.	5-pin DIN for Tweener Thermometers	-200 to 420°C		$950.00
561512G	12 x 1/4" Dia.	Gold pins	-200 to 420°C		$865.00
561512I	12 x 1/4" Dia.	INFO-CON for 1521/1522	-200 to 420°C		$950.00
561512J	12 x 1/4" Dia.	Banana Plugs	-200 to 420°C		$865.00
561512L	12 x 1/4" Dia.	Mini Space Lugs	-200 to 420°C		$950.00
561512M	12 x 1/4" Dia.	Mini Banana Plugs	-200 to 420°C		$865.00
561512S	12 x 1/4" Dia.	Spade Lugs	-200 to 420°C		$950.00
56159B	9 x 3/16" Dia.	Bare Wire	-200 to 420°C		$950.00
56159D	9 x 3/16" Dia.	5-pin DIN for Tweener Thermometers	-200 to 420°C		$950.00
56159G	9 x 3/16" Dia.	Gold pins	-200 to 420°C		$865.00
56159I	9 x 3/16" Dia.	INFO-CON for 1521/1522	-200 to 420°C		$950.00
56159J	9 x 3/16" Dia.	Banana Plugs	-200 to 420°C		$865.00
56159L	9 x 3/16" Dia.	Mini Space Lugs	-200 to 420°C		$950.00
56159M	9 x 3/16" Dia.	Mini Banana Plugs	-200 to 420°C		$865.00
56159S	9 x 3/16" Dia.	Spade Lugs	-200 to 420°C		$950.00
56156B	6 x 3/16" Dia.	Bare Wire	-200 to 300°C		$950.00
56156D	6 x 3/16" Dia.	5-pin DIN for Tweener Thermometers	-200 to 300°C		$950.00
56156G	6 x 3/16" Dia.	Gold pins	-200 to 300°C		$865.00
56156I	6 x 3/16" Dia.	INFO-CON for 1521/1522	-200 to 300°C		$890.00
56156J	6 x 3/16" Dia.	Banana Plugs	-200 to 300°C		$865.00
56156L	6 x 3/16" Dia.	Mini Space Lugs	-200 to 300°C		$890.00
56156M	6 x 3/16" Dia.	Mini Banana Plugs	-200 to 300°C		$865.00
56156S	6 x 3/16" Dia.	Spade Lugs	-200 to 300°C		$950.00
Optional Accessories
2601	Fluke Hart 2601 Probe Carrying Case				$81.00

Hart Scientific 5615 Secondary Reference Temperature Standards

Hart Scientific 5615
Secondary Reference Temperature Standards