Fluke Calibration 9173 Metrology Well

  • bvseo_sdk, p_sdk, 3.2.1
  • CLOUD, getAggregateRating, 60.71ms
  • REVIEWS, PRODUCT
  • bvseo-msg: HTTP status code of 404 was returned;

Key Features

  • Exceptional stability (±0.005 °C) and axial uniformity (±0.02 °C over a 60 mm zone).
  • Immersion depth to 203 mm (8 in)
  • Optional ITS-90 reference input reads PRTs to ±0.006 °C
  • Wide Temperature range from –45 °C to 700 °C

Product overview: Fluke Calibration 9173 Metrology Well

Display Accuracy

Most dry-wells are calibrated by inserting a calibrated PRT and adjusting internal control sensors. However, this approach has limited value due to:

  • Differences between the reference PRT and thermometers being tested
  • Thermal gradients in the block
  • Inadequate immersion from short blocks

Metrology Wells overcome these issues through:

  • Minimized temperature gradients, loading effects, and hysteresis
  • Calibration using traceable, accredited PRTs
  • Proprietary electronics with repeatable accuracy, exceeding specs by more than 10x
  • Display accuracy from ±0.1 °C (typical temps) to ±0.25 °C at 661 °C

An application note is available to better understand the associated uncertainties.

Optional: For improved accuracy, Metrology Wells can be ordered with built-in electronics for external PRT reading using ITS-90 characterizations.

Stability

Fluke heat sources are among the most stable in the world—and Metrology Wells improve upon this legacy:

  • Models 9170 / 9171: Stability of ±0.005 °C over the full range
  • Model 9173 (700 °C unit): Stability of ±0.03 °C

Only fluid baths or primary fixed-point devices offer better performance. This level of stability cannot be matched by the “off-the-shelf” controllers found in most dry-wells.

Axial Uniformity

According to EA-10/13 guidelines, dry-wells should have a 40 mm zone of maximum homogeneity. Metrology Wells go further with:

  • Dual-zone control
  • Increased well depth
  • Homogeneous zones extending 60 mm (2.36 in)
  • Vertical gradients ranging from ±0.02 °C at 0 °C to ±0.4 °C at 700 °C

Specifications for axial uniformity are published and guaranteed for each unit.

Radial Uniformity

Defined as the temperature difference between wells:

  • Metrology Wells use a strict definition—largest difference between homogeneous zones of wells ≤6.4 mm (0.25 in) in diameter
  • Models 9170 / 9171 (cold units): ±0.01 °C
  • Models 9172 / 9173 (hot units): ±0.01 °C to ±0.04 °C at 700 °C

Poorly designed sources or use of large probes can lead to large variations; Metrology Wells prevent this.

Loading Effects

Loading is the temperature shift when all wells are filled versus when only one is. Metrology Wells minimize this through:

  • Deep well design
  • Dual-zone controls
  • Cold units show minimal effects, as low as ±0.005 °C

Hysteresis

Thermal hysteresis arises mostly from internal control sensors rather than high-quality reference PRTs. It reflects the difference in measurements at the same set point approached from different directions.

  • More pronounced near midpoints of temperature ranges
  • Metrology Wells use better internal components
  • Hysteresis effects range from 0.025 °C to 0.07 °C

Immersion Depth

Deep immersion is key to minimizing axial gradient and loading effects. Metrology Wells accommodate sensor-specific factors such as:

  • Sensor location and size
  • Probe mass and width
  • Lead wire configuration

Well depths:

  • Models 9171 / 9172 / 9173: 203 mm (8 in)
  • Model 9170: 160 mm (6.3 in), enabling performance to –45 °C

User Interface and Software Features

Metrology Wells are simple and intuitive to use, featuring:

  • Large LCD display
  • Numeric keypad
  • On-screen menus in English, French, or Chinese
  • Real-time display of block temp, reference temp, cutout temp, stability, and ramp rate

Interfaces and Automation:

  • RS-232 serial interface
  • Compatible with Model 9930 Interface-it and xModel 9938 MET/TEMP II software
  • Supports fully automated calibration of RTDs, thermocouples, and thermistors

Pre-programmed functions (no PC required):

  • Up to 8 set points with ramp/soak
  • Automated “switch test” to identify thermal switch dead-band
  • Dedicated °C/°F switch button

Inserts and Portability

  • Choose from six standard inserts supporting both metric and imperial probe diameters
  • Units are compact and lightweight—easy to deploy in various environments

Model 9170 Summary

  • Temperature range down to –45 °C (in normal conditions)
  • Stability: ±0.005 °C
  • Immersion depth: 160 mm (6.3 in)
  • Axial uniformity: ±0.02 °C
  • Radial uniformity: ±0.01 °C

Specifications: Fluke Calibration 9173 Metrology Well

Specifications
Range (at 23°C ambient)50°C to 700°C1 (122°F to 1292°F)
Display accuracy±0.2°C: 50°C to 425°C
±0.25°C: 425°C to 660°C
Stability±0.005°C: 50°C to 100°C
±0.01°C: 100°C to 425°C
±0.03°C: 425°C to 700°C
Axial uniformity±0.1°C: 50°C to 100°C
±0.25°C: 100°C to 425°C
±0.4°C: 425°C to 700°C
Radial uniformity±0.01°C: 50°C to 100°C
±0.025°C: 100°C to 425°C
±0.04°C: 425°C to 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
Hysteresis0.07°C
Well depth203 mm (8 in)
Resolution0.001°C
DisplayLCD, °C or °F, user-selectable
Key padTen key with decimal and ± button. Function keys, menu key, and °C / °F key.
Cooling time235 min: 700°C to 50°C
153 min: 700°C to 100°C
Heating time46 min: 50°C to 700°C
Size (H x W x D)366 x 203 x 323 mm (14.4 x 8 x 12.7 in)
Weight15 kg (33 lb)
Power115 V AC (±10%), or
230 V AC (±10%), 50/60 Hz, 1025 W
Computer interfaceRS-232 Interface
Traceable calibration (NIST)Data at 100°C, 200°C, 350°C, 500°C, and 660°C
1. Calibrated to 660°C; reference thermometer recommended at higher temperatures.
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 9173 Metrology Well

Fluke 9173-A
Fluke Calibration 9173-A Metrology Well
Insert “A”, Al-Brnz, Misc Holes
50°C to 700°C

Buy it

Includes:

  • INSX
Fluke 9173-B
Fluke Calibration 9173-B Metrology Well
Insert “B”, Al-Brnz, Comparison Holes
50°C to 700°C

Buy it

Includes:

  • INSX
Fluke 9173-C
Fluke Calibration 9173-C Metrology Well
Insert “C”, Al-Brnz, 0.25-inch Holes
50°C to 700°C

Buy it

Includes:

  • INSX
Fluke 9173-D
Fluke Calibration 9173-D Metrology Well
Insert “D”, Al-Brnz, Comparison Metric Holes
50°C to 700°C

Buy it

Includes:

  • INSX
Fluke 9173-E
Fluke Calibration 9173-E Metrology Well
Insert “E”, Al-Brnz, Misc Metric Holes, w/ 0.25-inch Ref Hole
50°C to 700°C

Buy it

Includes:

  • INSX
Fluke 9173-F
Fluke Calibration 9173-F Metrology Well
Insert “F”, Al-Brnz, Metric Comparison Holes, w/ 0.25-inch Ref Hole
50°C to 700°C

Buy it

Includes:

  • INSX
Fluke 9173-A-R
Fluke Calibration 9173-A-R Metrology Well
Insert “A”, Al-Brnz, Misc Holes
50°C to 700°C

Buy it

Includes:

  • INSX
  • Built-In Reference
Fluke 9173-B-R
Fluke Calibration 9173-B-R Metrology Well
Insert “B”, Al-Brnz, Comparison Holes
50°C to 700°C

Buy it

Includes:

  • INSX
  • Built-In Reference
Fluke 9173-C-R
Fluke Calibration 9173-C-R Metrology Well
Insert “C”, Al-Brnz, 0.25-inch Holes
50°C to 700°C

Buy it

Includes:

  • INSX
  • Built-In Reference
Fluke 9173-D-R
Fluke Calibration 9173-D-R Metrology Well
Insert “D”, Al-Brnz, Comparison Metric Holes
50°C to 700°C

Buy it

Includes:

  • INSX
  • Built-In Reference
Fluke 9173-E-R
Fluke Calibration 9173-E-R Metrology Well
Insert “E”, Al-Brnz, Misc Metric Holes, w/ 0.25-inch Ref Hole
50°C to 700°C

Buy it

Includes:

  • INSX
  • Built-In Reference
Fluke 9173-F-R
Fluke Calibration 9173-F-R Metrology Well
Insert “F”, Al-Brnz, Metric Comparison Holes, w/ 0.25-inch Ref Hole
50°C to 700°C

Buy it

Includes:

  • INSX
  • Built-In Reference
  • bvseo_sdk, p_sdk, 3.2.1
  • CLOUD, getContent, 68.83ms
  • QUESTIONS, PRODUCT
  • bvseo-msg: HTTP status code of 404 was returned;
  • bvseo_sdk, p_sdk, 3.2.1
  • CLOUD, getReviews, 21.47ms
  • REVIEWS, PRODUCT
  • bvseo-msg: HTTP status code of 404 was returned;
Please enable cookies to view product reviews.

Manuals + Resources: Fluke Calibration 9173 Metrology Well

Chat with ourFluke assistant
Clear Chat

Hi, I'm your virtual assistant, I will do my very best to help you navigate all things Fluke related. You can ask me anything!

I'm new and might make a few mistakes. For safe use of Fluke tools, refer to the product manuals, safety sheets, and your company's safety requirements. To speak with a person, visit our Contact Us page or Talk to Sales page. For information on how we handle personal data, see our Privacy Policy

Please note that the use of Fluke's products requires professional knowledge, skills and training and should only be purchased for use by appropriately qualified professionals.