Fluke Calibration 9173 50°C to 700°C Metrology Well Calibrators

  • Best-performing industrial heat sources (accuracy, stability, uniformity) in the world
  • Immersion depth to 203 mm (8 in)
  • Optional ITS-90 reference input reads PRTs to ±0.006°C
  • Temperature range from 50°C to 700°CC
Fluke Calibration 9170 Series Metrology Well CalibratorsClick for larger image
Fluke Calibration 9170 Series Shown
Product Information
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With groundbreaking new pro-prietary electronics from Fluke Calibration (patents pending), Metrology Wells let you bring lab-quality performance into whatever field environment you might work in. New analog and digital control techniques provide stability as good as ±0.005°C. And with dual-zone control, axial (or "vertical") uniformity is as good as ±0.02°C over a 60 mm (2.36 in) zone. (That’s 60 mm!) Such performance doesn’t exist anywhere else outside of fluid baths.

In short, there are six critical components of performance in an industrial heat source (which the European metrology community explains, for example, in the document EA-10/13): calibrated display accuracy, stability, axial (vertical) uniformity, radial (well-to-well) uniformity, impact from loading, and hysteresis. We added a seventh in the form of a legitimate reference thermometer input and created an entirely new product category: Metrology Wells.

By the way, Metrology Wells are the only products on the market supported by published specifications addressing every performance category in the EA-10/13. Our specs aren’t just hopes or guidelines. They apply to every Metrology Well we sell.

For work between 50 °C and 700 °C, the Fluke Calibration 9173 provides unmatched performance. The Fluke Calibration 9173 has a display accuracy of ±0.25°C at 700°C and an immersion depth of 203 mm (8 in). Stability and uniformity performance of this unit are enough to dramatically reduce uncertainty budgets for calibrations of thermometers at high temperatures.

Of course, there’s still a place in the world for dry-wells or “dry block" calibrators. In fact, Fluke Calibration makes and will continue to make some of the best performing, portable, fast dry-wells in the world. There’s still nothing better for a quick test of industrial temperature sensor performance.

Display accuracy
Dry-wells are typically calibrated by inserting a calibrated PRT into one of the wells and making adjustments to the calibrator’s internal control sensor based on the readings from the PRT. This has limited value because the unique characteristics of the reference PRT, which essentially become “calibrated into" the calibrator, are often quite different from the thermometers tested by the calibrator. This is complicated by the presence of significant thermal gradients in the block and inadequate sensor immersion into blocks that are simply too short.

Temperature gradients, loading effects, and hysteresis have been minimized to make the calibration of the display much more meaningful. The Fluke Calibration 9170 Series Metrology Well Calibrators uses only traceable, accredited PRTs to calibrate Metrology Wells and our proprietary electronics consistently demonstrate repeatable accuracy more than ten times better than our specs, which range from ±0.1°C at the most commonly used temperatures to ±0.25°C at 661°C. For even better accuracy, Fluke Calibration 9170 Series Metrology Well Calibrators may be ordered with built-in electronics for reading external PRTs with ITS-90 characterizations.

Heat sources from Fluke Calibration have long been known as the most stable heat sources in the world. The Fluke Calibration 9171 Series only gets better with Metrology Wells. Both low-temperature units are table to ±0.005°C over their full range. Even the 700°C unit (Model 9173) achieves stability of ±0.03 °C. Better stability can only be found in fluid baths and primary fixed-point devices. The “off-the-shelf controllers" used by most dry-well manufacturers simply can’t provide this level of performance.

Axial uniformity
The Fluke Calibration 9170 Series EA-10/13 document suggests that dry-wells should include a zone of maximum temperature homogeneity, which extends for 40 mm (1.54 in), usually at the bottom of a well. Metrology Wells, however, combine our unique electronics with dual-zone control and more well depth than is found in dry-wells to provide homogeneous zones over 60 mm (2.36 in). Vertical gradients in these zones range from ±0.02°C at 0°C to ±0.4°C at 700°C

Radial uniformity
Radial uniformity is the difference in temperature between one well and another well. For poorly designed heat sources, or when large-diameter probes are used, these differences can be very large. For Metrology Wells, we define our specification as the largest temperature difference between the vertically homogeneous zones of any two wells that are each 6.4 mm (0.25 in) in diameter or smaller. The hot units (9172 and 9173) range from ±0.01°C to ±0.04°C (at 700°C).

Loading is defined as the change in temperature sensed by a reference thermometer inserted into the bottom of a well after the rest of the wells are filled with thermometers, too. For Metrology Wells, loading effects are minimized for the same reasons that axial gradients are minimized. We use deeper wells than found in dry-wells. And we utilize proprietary dual-zone controls. Loading effects are as minimal as ±0.005°C in the cold units.

Thermal hysteresis exists far more in internal control sensors than in good-quality reference PRTs. It is evidenced by the difference in two external measurements of the same set-point tempera-ture when that temperature is approached from two different directions (hotter or colder) and is usually largest at the midpoint of a heat source’s temperature range. It exists because control sensors are typically designed for ruggedness and do not have the “strain free” design characteristics of SPRTs, or even most PRTs. For Hart Scientific 9170 Series Metrology Wells, hysteresis effects range from 0.025°C to 0.07°C.

Immersion depth
Immersion depth matters. Not only does it help minimize axial gradient and loading effects, it helps address the unique immersion characteristics of each thermometer tested in the heat source. Those characteristics include the location and size of the actual sensor within the probe, the width and thermal mass of the probe, and the lead wires used to connect the sensor to the outside world. The Hart Scientific 9170 Series Metrology Wells feature well depths of 203 mm (8 in) in the Fluke Calibration 9171, 9172, and 9173. The Hart 9170 Series 9170 is 160 mm (6.3 in) deep to facilitate temperature of –45°C.

Other great features
A large LCD display, numeric keypad, and on-screen menus make use of Metrology Wells simple and intuitive. The display shows the block temperature, built-in reference thermometer temperature, cutout temperature, stability criteria, and ramp rate. The user interface can be configured to display in English, French, or Chinese.

All four models come with an RS-232 serial interface and the Model 9930, Interface-it software. All are also compatible with Model 9938 MET/TEMP II software for completely automated calibrations of RTDs, thermocouples, and thermistors.

Even without a PC, Metrology Wells have four different preprogrammed calibration tasks that allow up to eight temperature set points with “ramp and soak" times between each. There is an automated “switch test" protocol that zeros in on the “dead-band" for thermal switches. And a dedicated °C/°F button allows for easy switching of temperature units. Any of six standard inserts may be ordered with each unit, accommodating a variety of metric and imperial-sized probe diameters.

Model 9173
Range (at 23°C ambient) 50°C to 700°C†
(122°F to 1292°F)
Display accuracy ±0.2°C at 425°C
±0.25°C at 660°C
Stability ±0.005°C to 100°C
±0.01°C to 425°C
±0.03°C to 700°C
Axial uniformity (60 mm) ±0.1°C at 100°C
±0.25°C at 425°C
±0.4°C at 700°C
Radial uniformity ±0.01°C at 100°C
±0.025°C at 425°C
±0.04°C at 700°C
Loading effect
(with a 6.35 mm reference
probe and three 6.35 mm probes)
±0.02°C at 425°C
±0.04°C at 700°C
Hysteresis 0.07°C
Well depth 8 in (203 mm)
Resolution 0.001°C
Display LCD, °C or °F, user-selectable
Key pad Ten key with decimal and +/- button. Function keys, menu key, and °C /°F key.
Cooling time 235 min: 700°C to 50°C
153 min: 700°C to 100°C
Heating time 46 min: 50°C to 700°C
(height x width x depth)
14.4 x 8 x 12.7 in (366 x 203 x 323 mm)
Weight 33lb (15 kg)
Power 115 VAC (±10%), 10 A, or 230 VAC (±10%), 5 A
Computer interface RS-232 Interface with 9930 Interface-it control software included
Traceable calibration (NIST) Data at 100°C, 200°C, 350°C, 500°C, and 660°C
Built-in reference input
Temperature range –200°C to 962°C (–328°F to 1764°F)
Resistance range 0 Ω to 400 Ω, auto-ranging
Characterizations ITS-90 subranges 4, 6, 7, 8, 9, 10, and 11 Callendar-Van Dusen (CVD): R0, α, α, α
Resistance accuracy 0Ω to 20Ω: 0.0005 Ω
20Ω to 400 Ω: 25 ppm
Temperature accuracy
(does not include probe uncertainty)
10 Ω PRTs:
±0.013°C at 0°C
±0.014°C at 155°C
±0.019°C at 425°C
±0.028°C at 700°C
25 Ω and 100 Ω PRTs:
±0.007°C at –100°C
±0.006°C at 0°C
±0.011°C at 155°C
±0.013°C at 225°C
±0.019°C at 425°C
±0.027°C at 661°C
Resistance resolution 0Ω to 20Ω: 0.0001Ω
20Ω to 400Ω: 0.001Ω
Measurement period 1 second
Probe connection 4-wire with shield, 5-pin DIN connector
Calibration NVLAP accredited (built-in reference input only), NIST-traceable calibration provided
Ordering Information
Model Description Buy Online Price
-A Models
MFR ID: 2459526 
Fluke Calibration 9173-A-156 Metrology Well Calibrator, 700C, W/9173-INSA, 115V Buy Now $9,415.00
MFR ID: 2459544 
Fluke Calibration 9173-A-R-156 Metrology Well Calibrator, 700C,W/9173-INSA,W/Ref, 115V Buy Now $10,890.00
-B Models
MFR ID: 2459567 
Fluke Calibration 9173-B-156 Metrology Well Calibrator, 700C, W/9173-INSB, 115V Buy Now $9,415.00
MFR ID: 2459580 
Fluke Calibration 9173-B-R-156 Metrology Well Calibrator, 700C,W/9173-INSB,W/Ref, 115V Buy Now $10,890.00
-C Models
MFR ID: 2459604 
Fluke Calibration 9173-C-156 Metrology Well Calibrator, 700C, W/9173-INSC, 115V Buy Now $9,415.00
MFR ID: 2459628 
Fluke Calibration 9173-C-R-156 Metrology Well Calibrator, 700C,W/9173-INSC,W/Ref, 115V Buy Now $10,890.00
-D Models
MFR ID: 2459643 
Fluke Calibration 9173-D-156 Metrology Well Calibrator, 700C, W/9173-INSD, 115V Buy Now $9,415.00
MFR ID: 2459662 
Fluke Calibration 9173-D-R-156 Metrology Well Calibrator, 700C,W/9173-INSD,W/Ref, 115V Buy Now $10,890.00
MFR ID: 3016049 
Fluke Calibration 9173-DW-156 Metrology Well Calibrator, 700C, No insert, 115V Buy Now $8,580.00
MFR ID: 3016060 
Fluke Calibration 9173-DW-R-156 Metrology Well Calibrator,700C,No Insrt,W/Bltin Ref,115V Buy Now $10,060.00
-E Models
MFR ID: 2459681 
Fluke Calibration 9173-E-156 Metrology Well, 700C, W/9173-INSE, 115V Buy Now $9,415.00
MFR ID: 2459709 
Fluke Calibration 9173-E-R-156 Metrology Well Calibrator, 700C,W/9173-INSE,W/Ref, 115V Buy Now $10,890.00
-F Models
MFR ID: 2459727 
Fluke Calibration 9173-F-156 Metrology Well Calibrator, 700C, W/9173-Insf, 115V Buy Now $9,415.00
MFR ID: 2459748 
Fluke Calibration 9173-F-R-156 Metrology Well Calibrator, 700C,W/9173-Insf,W/Ref, 115V Buy Now $10,890.00
Optional Accessories
MFR ID: 3003417 
Fluke Calibration 5618B-9-D Probe, Secon. PRT, 9 x 1/8 inch OD Buy Now $1,175.00
MFR ID: 3003572 
Fluke Calibration 5627A-12-D Probe, RTD Industrial 12 x 1/4 inch OD Buy Now Sale $760.50
(Reg. $845.00)
MFR ID: 3003735 
Fluke Calibration 5627A-9-D Probe, RTD Industrial 9 x 1/4 inch OD Buy Now Sale $760.50
(Reg. $845.00)
MFR ID: 3003814 
Fluke Calibration 5627A-BEND-D Probe, RTD Industrial (1/4 x 12 inch) 90 bend Discontinued
MFR ID: 3057055 
Fluke Calibration 5608-12-D 5-pin DIN Secondary PRT Probe; 12in x 1/8in, -200 to 500C Buy Now Sale $630.00
(Reg. $700.00)
MFR ID: 3057134 
Fluke Calibration 5608-9-D 5-pin DIN Secondary PRT Probe; 9in x 1/8in, -200 to 500C Buy Now Sale $630.00
(Reg. $700.00)
MFR ID: 3056578 
Fluke Calibration 5609-12-D 5-pin DIN Secondary PRT Probe; 12in x 1/4in, -200 to 670C Buy Now Sale $819.00
(Reg. $910.00)
MFR ID: 3056656 
Fluke Calibration 5609-15-D 5-pin DIN Secondary PRT Probe; 15in x 1/4in, -200 to 670C Buy Now $1,015.00
MFR ID: 3056734 
Fluke Calibration 5609-20-D 5-pin DIN Secondary PRT Probe; 20in x 1/4in, -200 to 670C Buy Now $1,140.00
MFR ID: 3056815 
Fluke Calibration 5609-300-D Secondary PRT Probe, 100 Ohm (6 X 300 Mm), 5-pin DIN Buy Now Sale $819.00
(Reg. $910.00)
MFR ID: 3056898 
Fluke Calibration 5609-400-D Secondary PRT Probe, 100 Ohm (6 X 400 Mm), 5-pin DIN Buy Now $1,015.00
MFR ID: 3056977 
Fluke Calibration 5609-500-D Secondary PRT Probe, 100 Ohm (6 X 500 Mm), 5-pin DIN Buy Now $1,140.00
MFR ID: 3002846 
Fluke Calibration 5615-12-D Probe, Secon. PRT, 100 ohm (1/4 x 12 inch) Buy Now $1,170.00
MFR ID: 3002760 
Fluke Calibration 5615-9-D Probe, Secon. PRT, 100 ohm (3/16 x 9 inch) Buy Now $1,170.00
MFR ID: 3002925 
Fluke Calibration 5615-BEND-D Probe, Secondary Reference PRT, 100 Ohm, 90 deg bend Discontinued
MFR ID: 3032653 
Fluke Calibration 5616-12-D 5-pin DIN Secondary Reference PRT, 6.35mm x 298mm (0.250 x 11.75 in), -200 to 420C Buy Now $1,080.00
MFR ID: 3003257 
Fluke Calibration 5618B-12-D Probe, Secon. PRT, 12 x 1/8 inch OD Buy Now $1,175.00
MFR ID: 3003572 
Fluke Calibration 5627A-12-D Probe, RTD Industrial 12 x 1/4 inch OD Buy Now Sale $760.50
(Reg. $845.00)
MFR ID: 3003735 
Fluke Calibration 5627A-9-D Probe, RTD Industrial 9 x 1/4 inch OD Buy Now Sale $760.50
(Reg. $845.00)
MFR ID: 3622848 
Fluke Calibration 5606-50-D Immersion Probe, 50mm, -200 to 160C Buy Now Sale $360.00
(Reg. $400.00)
560775D Fluke Calibration 5607-75-D Immersion Probe, 75mm, 0 to 450C Discontinued
MFR ID: 3116043 
Fluke Calibration 5609-9BND-D Secondary Reference PRT, 100 Ohm, 9 in, 90 deg bend Buy Now $1,110.00
MFR ID: 2460086 
Fluke Calibration 9170-CASE Carrying Case for the 9170-3 Buy Now Sale $774.00
(Reg. $860.00)
MFR ID: 2460099 
Fluke Calibration 9170-DCAS Distributor Carrying Case for the 9170-3 Buy Now $1,250.00
MFR ID: 2460001 
Fluke Calibration 9173-INSA insert, A,9173, Misc Hls Buy Now Sale $751.50
(Reg. $835.00)
MFR ID: 2460012 
Fluke Calibration 9173-INSB insert, B,9173, Cmp Hls Buy Now Sale $751.50
(Reg. $835.00)
MFR ID: 2460020 
Fluke Calibration 9173-INSC insert, C,9173, Four 0.25 In Hls Buy Now Sale $751.50
(Reg. $835.00)
MFR ID: 2460035 
Fluke Calibration 9173-INSD insert, D,9173, Metric Misc Hls Buy Now Sale $751.50
(Reg. $835.00)
MFR ID: 2460047 
Fluke Calibration 9173-INSE insert, E,9173, Metric,0.25 In Ref,Misc Hls Buy Now Sale $751.50
(Reg. $835.00)
MFR ID: 2460058 
Fluke Calibration 9173-INSF insert, F, 9173, Metric,0.25 In Ref,Cmp Hls Buy Now Sale $751.50
(Reg. $835.00)
MFR ID: 2460073 
Fluke Calibration 9173-INSZ insert, Blank, 9173 Buy Now Sale $531.00
(Reg. $590.00)