Product overview: Fluke Calibration 9144 Metrology Well

High-performance field dry-well for industrial temperature calibration

Built-in Features for Large Workloads and Common Applications

The Fluke 9144 Metrology Well is built to handle a wide range of field applications with speed, precision, and convenience. Whether calibrating 4–20 mA transmitters or thermostatic switches, the 9144 provides:

• Wide temperature range coverage with three model options: –25 °C to 660 °C
• Compatibility with PRTs, RTDs, thermocouples, and transmitters
• Optional “Process” version (914X-X-P) with a built-in two-channel thermometer readout, including 24 V loop power for 4–20 mA transmitters

Each process version:

• Accepts an ITS-90 reference PRT
• Features built-in readout accuracy from ±0.01 °C to ±0.07 °C
• Stores individual sensor calibration constants in the probe housing for interchangeable use
• Includes a second user-selectable channel for 2-, 3-, or 4-wire RTDs, thermocouples, or transmitters

With Field Metrology Wells, you no longer need to carry multiple devices into the field—one instrument handles it all.

Calibrate the Entire Loop, Not Just the Electronics

Traditionally, only the electronics of a temperature transmitter were calibrated—leaving the sensor unchecked. However, studies show that 75% of transmitter system error originates in the sensor. The 9144 enables full-loop calibration for more accurate and reliable results.

Onboard Automation and Documentation

The process versions include non-volatile memory for storing up to 20 calibration tests, each with:

• Unique alphanumeric ID
• Block temperature
• Reference temperature
• UUT values
• Error, date, and time

Results can be:

• Viewed directly on the front panel
• Exported via included Model 9930 Interface-it software for reports or raw ASCII data
• Integrated with the 1586A Super-DAQ for automated sensor calibrations

Automated Thermostatic Switch Testing

Field Metrology Wells support both auto and manual test setups:

• Auto setup requires just the nominal switch temperature and runs a 3-cycle calibration, displaying the dead band result
• Manual setup lets you fully customize ramp rate, cycle count, and test sequence

Both options are quick, accurate, and easy to use.

Uncompromising Metrology Performance

The 9144 meets the six key criteria established by EA guidelines for high-accuracy temperature sources:

• Accuracy
• Stability
• Axial (vertical) uniformity
• Radial (well-to-well) uniformity
• Loading effects
• Hysteresis

Each unit comes with an IEC-17025 NVLAP-accredited calibration certificate, backed by:

• High-quality traceable reference PRTs
• Rigorous uncertainty analysis
• 4:1 test uncertainty ratio

Display Accuracy:

• 9144: ±0.35 °C at 420 °C, ±0.5 °C at 660 °C

Stability:

• 9144: ±0.05 °C at 660 °C
• 9142: ±0.01 °C over full range
• 9143: ±0.02 °C at 33 °C, ±0.03 °C at 350 °C

Radial Uniformity: ±0.01 °C

Axial Uniformity: ±0.05 °C at 40 mm (1.6 in)

Designed for the Field

These wells are engineered for real-world environments:

• Lightweight and portable: under 8.2 kg (18 lb)
• Compact footprint for ease of transport
• Fast time to temperature for productivity in the field
• Environmental compensation (patent pending) guarantees performance across 13 °C to 33 °C, even in unstable surroundings

User-Friendly Operation

Using the 9144 is straightforward:

• Large, easy-to-read LCD display
• Intuitive function keys and menu navigation
• Dedicated “SET PT.” button for quick temperature input
• Visual and audible stability indicators
• Preprogrammed calibration routines stored in memory
• All inputs are accessible from the front panel

The Metrology Advantage

Fluke Metrology Wells are engineered by the same teams who support national labs and define the Kelvin—not by companies that “dabble” in temperature calibration.

Fluke’s deep expertise in metrology ensures:

• Published, verifiable specs
• Unmatched temperature performance
• Trusted results for demanding industrial environments

Small Dry Wells for Big Field Applications

The 9142, 9143, and 9144 Field Metrology Wells deliver industrial-grade features with laboratory-level accuracy. When combined with the process option, these tools become powerful all-in-one calibration instruments.

Temperature range coverage: –25 °C to 660 °C

Applications:

• Transmitter loop calibrations
• Comparison calibrations
• Thermocouple checks