Fluke Calibration 9170 Field Metrology Well

Model#: Fluke 9170-A Part#: 2458800 UPC#: 0 95969 29384 6
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  • Fluke Calibration 9170 Field Metrology Well

Key features

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.

Metrology Wells are different. Temperature gradients, loading effects, and hysteresis have been minimized to make the calibration of the display much more meaningful. We use 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.

An application note is available to help better understand the uncertainties mentioned above.

For even better accuracy, Metrology Wells may be ordered with built-in electronics for reading external PRTs with ITS-90 characterizations. (See sidebar, Built in Reference Thermometry)


Heat sources from Fluke Calibration have long been known as the most stable heat sources in the world. It only gets better with Metrology Wells. Both low-temperature units (Models 9170 and 9171) are stable 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 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.

What’s more, Metrology Wells actually have these specifications published for each unit, and we stand by them.

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 cold units (9170 and 9171) provide radial uniformity of ±0.01 °C and 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 temperature 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 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. Metrology Wells feature well depths of 203 mm (8 in) in the Models 9171, 9172, and 9173. The Model 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. (See inset at right. Download the complete data sheet to view details.) And Metrology Wells are small enough and light enough to go anywhere.


The Model 9170 achieves the lowest temperatures of the series, reaching –45 °C in normal room conditions. The 9170 is stable to ±0.005 °C over its full temperature range (up to 140 °C) and has 160 mm (6.3 in) of immersion depth. With axial uniformity of ±0.02 °C and radial uniformity of ±0.01 °C, this model delivers exceptional uncertainty budgets and is perfect for a variety of pharmaceutical and other applications.

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Product overview: Fluke Calibration 9170 Field Metrology Well

Accurate enough for lab use, and rugged and portable enough to take anywhere

  • 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 –45 °C to 700 °C

Every once in a while, a new product comes around that changes the rules. It happened when we introduced handheld dry-wells. It happened when we introduced Micro-Baths. Now we’ve combined bath-level performance with dry-well functionality and legitimate reference thermometry to create Metrology Wells.

With groundbreaking new proprietary electronics from Fluke Calibration's (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.)

Specifications: Fluke Calibration 9170 Field Metrology Well

Range (at 23°C ambient)–45°C to 140°C (–49°F to 284°F)
Display accuracy±0.1°C full range
Stability±0.005°C full range
Axial uniformity±0.1°C at –45°C
±0.04°C at –35°C
±0.02°C at 0°C
±0.07°C at 140°C
Radial uniformity±0.01°C full range
Loading effect (with a 6.35 mm reference probe and three 6.35 mm probes)±0.02°C at –45°C
±0.005°C at –35°C
±0.01°C at 140°C
Well depth160 mm (6.3 in)
DisplayLCD, °C or °F, user-selectable
Key padTen key with decimal and ± button. Function keys, menu key, and °C / °F key.
Cooling time44 min: 23°C to –45°C
19 min: 23°C to –30°C
19 min: 140°C to 23°C
Heating time32 min: 23°C to 140°C
45 min: –45°C to 140°C
Size (H x W x D)366 x 203 x 323 mm (14.4 x 8 x 12.7 in)
Weight14.2 kg (31.5 lb)
Power115 V AC (±10%), or
230 V AC (±10%), 50/60 Hz, 550 W
Computer interfaceRS-232 Interface with 9930 Interface-it control software included
Traceable calibration (NIST)Data at –45°C, 0°C, 50°C, 100°C, and 140°C
SpecificationsBuilt-in Reference Input
Temperature range–200°C to 962°C (–328°F to 1764°F)
Resistance range0 Ω to 400 Ω, auto-ranging
CharacterizationsITS-90 subranges 4, 6, 7, 8, 9, 10, and 11 Callendar-Van Dusen (CVD): R0, a, b, d
Resistance accuracy0 Ω to 20 Ω: 0.0005 W
20 Ω 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:
±0.005°C at –100°C
±0.007°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 resolution0 Ω to 20 Ω: 0.0001 Ω
20 Ω to 400 Ω: 0.001 Ω
Measurement period1 second
Probe connection4-wire with shield, 5-pin DIN connector
CalibrationNVLAP accredited (built-in reference input only), NIST-traceable calibration provided

Models: Fluke Calibration 9170 Field Metrology Well

Fluke 9170-A
Fluke Calibration 9170-A Field Metrology Well
Insert “A”, Al, Misc Holes
–45°C to 140°C
Part#: 2458800
UPC#: 0 95969 29384 6


  • INSX
Fluke 9170-B
Fluke Calibration 9170-B Field Metrology Well
Insert “B”, Al, Misc Holes
–45°C to 140°C
Part#: 2458856
UPC#: 0 95969 29389 1


  • INSX
Fluke 9170-C
Fluke Calibration 9170-C Field Metrology Well
Insert “C”, Al, 0.25-inch Holes
–45°C to 140°C
Part#: 2458895
UPC#: 0 95969 29393 8


  • INSX
Fluke 9170-D
Fluke Calibration 9170-D Field Metrology Well
Insert “D”, Al, Metric Comparison Holes
–45°C to 140°C
Part#: 2458935
UPC#: 0 95969 29397 6


  • INSX
Fluke 9170-E
Fluke Calibration 9170-E Field Metrology Well
Insert “E”, Al, Misc Metric Holes, w/0.25-inch Ref Hole
–45°C to 140°C
Part#: 2458973
UPC#: 0 95969 29401 0


  • INSX
Fluke 9170-F
Fluke Calibration 9170-F Field Metrology Well
Insert “F”, Al, Metric Comparison Holes, w/ 0.25-inch Ref Hole
–45°C to 140°C
Part#: 2459014
UPC#: 0 95969 29405 8


  • INSX
Fluke 9170-A-R
Fluke Calibration 9170-A-R Metrology Well
Insert “A”, Al, Misc Holes
–45°C to 140°C
Part#: 2458839
UPC#: 0 95969 29387 7


  • INSX
  • Built-In Reference
Fluke 9170-B-R
Fluke Calibration 9170-B-R Metrology Well
Insert “B”, Al, Misc Holes
–45°C to 140°C
Part#: 2458874
UPC#: 0 95969 29391 4


  • INSX
  • Built-In Reference
Fluke 9170-C-R
Fluke Calibration 9170-C-R Metrology Well
Insert “C”, Al, 0.25-inch Holes
–45°C to 140°C
Part#: 2458912
UPC#: 0 95969 29395 2


  • INSX
  • Built-In Reference
Fluke 9170-D-R
Fluke Calibration 9170-D-R Metrology Well
Insert “D”, Al, Metric Comparison Holes
–45°C to 140°C
Part#: 2458958
UPC#: 0 95969 29399 0


  • INSX
  • Built-In Reference
Fluke 9170-E-R
Fluke Calibration 9170-E-R Metrology Well
Insert “E”, Al, Misc Metric Holes, w/ 0.25-inch Ref Hole
–45°C to 140°C
Part#: 2458999
UPC#: 0 95969 29403 4


  • INSX
  • Built-In Reference
Fluke 9170-F-R
Fluke Calibration 9170-F-R Metrology Well
Insert “F”, Al, Metric Comparison Holes, w/ 0.25-inch Ref Hole
–45°C to 140°C
Part#: 2459038
UPC#: 0 95969 29407 2


  • INSX
  • Built-In Reference
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