The Fluke Calibration 9171 is a high precision metrology well designed for demanding temperature calibration applications in professional calibration laboratories, industrial facilities and quality assurance departments.
With a temperature range from −30 °C to +155 °C, exceptional temperature stability of ±0.005 °C and a calibrated display accuracy of ±0.1 °C, the Fluke Calibration 9171 provides excellent conditions for calibrating platinum resistance thermometers, industrial RTDs, thermistors and other compatible temperature sensors.
The instrument combines the convenience of a dry block calibrator with advanced metrological performance.
One of its most important features is the calibration well depth of 203 mm, providing excellent immersion conditions for temperature sensors.
The Fluke Calibration 9171 also offers radial temperature uniformity of ±0.01 °C throughout its operating range.
These characteristics make the instrument particularly suitable for comparison calibration, where a calibrated reference thermometer and the device under test are measured simultaneously.
An optional integrated reference thermometer input allows compatible platinum resistance thermometers to be measured directly.
The instrument also provides programmable calibration procedures, automatic temperature switch testing and an RS232 communication interface.
europascal supports customers with professional temperature calibration equipment, reference thermometers and complete calibration solutions.
For professional calibration services and metrological traceability, visit the europascal Calibration Service.
Your Benefits at a Glance
- Temperature range from −30 °C to +155 °C
- Temperature stability of ±0.005 °C throughout the operating range
- Display accuracy of ±0.1 °C
- Radial temperature uniformity of ±0.01 °C
- Excellent axial temperature uniformity
- Calibration well depth of 203 mm
- Temperature resolution of 0.001 °C
- Low temperature loading effects
- Temperature hysteresis of 0.025 °C
- Optional integrated reference thermometer input
- Support for ITS 90 thermometer coefficients
- Support for Callendar Van Dusen coefficients
- Interchangeable aluminum calibration inserts
- Six standard insert configurations
- Programmable calibration procedures
- Automatic temperature switch testing
- RS232 communication interface
- NIST traceable calibration included
- Professional technical support from europascal
Ideal for Demanding Calibration Applications
The Fluke Calibration 9171 is designed for applications requiring excellent temperature stability, low thermal gradients and reproducible calibration conditions.
Accurate temperature measurements are essential in pharmaceutical production, laboratory testing, industrial manufacturing and process control.
Temperature sensors must be calibrated regularly to maintain reliable measurement results.
The Fluke Calibration 9171 provides a controlled temperature environment for comparison calibration.
Its temperature range from −30 °C to +155 °C covers numerous industrial and laboratory applications.
The instrument is particularly suitable for calibrating platinum resistance thermometers and industrial temperature sensors.
Typical applications include calibration laboratories, pharmaceutical production, refrigeration systems, temperature chambers and quality assurance departments.
For demanding calibration applications, a calibrated external reference thermometer can be used to determine the actual temperature inside the calibration insert.
This allows the device under test to be compared directly with a traceable reference temperature.
Temperature Range from −30 °C to +155 °C
The Fluke Calibration 9171 provides a temperature range of:
−30 °C to +155 °C
The specified range applies at an ambient temperature of 23 °C.
This makes the instrument suitable for calibration applications requiring temperatures below and above ambient conditions.
The integrated heating and cooling system enables the instrument to generate stable temperatures throughout its operating range.
Typical calibration temperatures may include −20 °C, 0 °C, 25 °C, 50 °C, 100 °C and 150 °C.
The appropriate calibration points depend on the operating range and accuracy requirements of the temperature sensor under test.
Exceptional Temperature Stability
Temperature stability is one of the most important characteristics of a precision temperature calibrator.
The Fluke Calibration 9171 provides:
±0.005 °C throughout the operating range
This corresponds to a temperature stability of only five millikelvin.
Temperature stability describes fluctuations of the calibration source temperature over time under defined operating conditions.
Excellent stability is particularly important when calibrating precision resistance thermometers.
It helps reduce measurement uncertainty contributions caused by temporal temperature fluctuations.
However, temperature stability must not be confused with the accuracy of the internal temperature indication or the expanded measurement uncertainty of a calibration.
Accurate Temperature Indication
The Fluke Calibration 9171 features a calibrated temperature display.
The manufacturer specifies:
Display accuracy: ±0.1 °C
This specification applies throughout the operating range.
For applications where this accuracy is sufficient, the internal temperature indication can be used as the reference.
For demanding comparison calibration, an external calibrated reference thermometer is recommended.
The reference thermometer measures the temperature at the calibration position.
The device under test can then be compared with the reference temperature.
The achievable measurement uncertainty depends on the reference thermometer, temperature uniformity, stability and calibration procedure.
Excellent Axial Temperature Uniformity
The Fluke Calibration 9171 provides well-characterized axial temperature uniformity.
The manufacturer specifies:
±0.025 °C at −30 °C
±0.02 °C at 0 °C
±0.07 °C at +155 °C
Axial uniformity describes temperature differences along the vertical direction of the calibration well.
Temperature gradients can influence calibration results when sensors have different immersion depths or sensing element positions.
The Fluke Calibration 9171 is designed to minimize these effects.
For accurate comparison calibration, the reference thermometer and device under test should be positioned at suitable and comparable immersion depths.
Excellent Radial Temperature Uniformity
The Fluke Calibration 9171 provides exceptional radial temperature uniformity.
The manufacturer specifies:
±0.01 °C throughout the operating range
Radial uniformity describes temperature differences between measurement positions within the calibration insert.
Good radial uniformity is particularly important when several temperature sensors are calibrated simultaneously.
It helps ensure that the reference thermometer and devices under test are exposed to similar temperatures.
The actual temperature distribution depends on the insert configuration, probe dimensions and thermal loading.
Low Temperature Loading Effect
The Fluke Calibration 9171 provides a low temperature loading effect.
The manufacturer specifies:
±0.005 °C at −30 °C
±0.005 °C at 0 °C
±0.01 °C at +155 °C
These specifications apply under defined conditions using one 6.35 mm reference thermometer and three additional 6.35 mm probes.
The loading effect describes temperature changes caused by inserting additional sensors into the calibration block.
Low loading effects are particularly important during comparison calibration.
They help maintain stable temperature conditions when several sensors are inserted simultaneously.
Temperature Hysteresis
The Fluke Calibration 9171 has a specified temperature hysteresis of:
0.025 °C
Temperature hysteresis describes differences in the temperature indication depending on whether a calibration temperature is approached from a higher or lower temperature.
This effect can contribute to the measurement uncertainty.
The Fluke Calibration 9171 is designed to provide reproducible calibration conditions during heating and cooling cycles.
Calibration Well Depth of 203 mm
One of the most important advantages of the Fluke Calibration 9171 is its deep calibration well.
The manufacturer specifies:
203 mm
This corresponds to:
8 inches
Sufficient immersion depth is particularly important when calibrating resistance thermometers.
Heat conduction along the thermometer stem can cause differences between the sensing element temperature and the actual temperature of the calibration block.
The deep calibration well helps reduce these effects.
It is particularly beneficial when calibrating longer industrial temperature sensors.
The required immersion depth depends on the sensor construction, diameter, sensing element length and calibration temperature.
Temperature Resolution of 0.001 °C
The Fluke Calibration 9171 provides a temperature display resolution of:
0.001 °C
This corresponds to one millikelvin.
The fine display resolution allows small temperature changes to be observed.
It is particularly useful when monitoring temperature stability and performing precision comparison measurements.
Display resolution must not be confused with temperature accuracy or measurement uncertainty.
Heating and Cooling Performance
The Fluke Calibration 9171 provides efficient heating and cooling performance.
The manufacturer specifies the following typical times.
Cooling from 23 °C to −30 °C: 30 minutes
Cooling from 155 °C to 23 °C: 25 minutes
Heating from 23 °C to 155 °C: 44 minutes
Heating from −30 °C to 155 °C: 56 minutes
These characteristics support calibration procedures involving multiple temperature points.
Actual heating and cooling times depend on operating conditions and thermal loading.
Interchangeable Calibration Inserts
The Fluke Calibration 9171 uses interchangeable aluminum calibration inserts.
Different insert configurations are available for temperature sensors with different diameters.
The manufacturer offers six standard configurations.
Insert A: Mixed imperial calibration openings.
Insert B: Imperial comparison openings.
Insert C: Six openings with a diameter of 6.35 mm.
Insert D: Metric comparison openings.
Insert E: Mixed metric openings with an additional 6.35 mm reference opening.
Insert F: Metric comparison openings with an additional 6.35 mm reference opening.
The appropriate insert should be selected according to the dimensions of the reference thermometer and the devices under test.
A suitable fit between the sensor and insert helps improve thermal contact and reduce measurement uncertainty.
Optional Integrated Reference Thermometer Input
The Fluke Calibration 9171 is available with an optional integrated reference thermometer input.
These versions are identified by the additional R in the model designation.
For example:
Fluke Calibration 9171-A-R
The integrated reference input supports compatible platinum resistance thermometers.
It allows temperature measurements using ITS 90 and Callendar Van Dusen coefficients.
The manufacturer specifies reference readout accuracy for 25 Ω and 100 Ω platinum resistance thermometers of:
±0.007 °C at 0 °C
±0.011 °C at 155 °C
These values describe the accuracy of the integrated reference thermometer readout.
They do not include the uncertainty of the connected reference thermometer.
The total measurement uncertainty depends on the reference thermometer, readout and calibration conditions.
Platinum Resistance Thermometer Calibration
The Fluke Calibration 9171 is particularly suitable for calibrating platinum resistance thermometers.
Typical applications include Pt100 sensors, precision platinum resistance thermometers and compatible reference thermometers.
The sensor under test is inserted into a suitable calibration opening.
A calibrated reference thermometer is positioned in another opening.
After thermal stabilization, the temperature indications are compared.
The indication error can be calculated as:
ΔT = T_DUT − T_REF
Where:
ΔT is the temperature indication error.
T_DUT is the temperature indicated by the device under test.
T_REF is the reference temperature.
The measurement uncertainty depends on the reference thermometer, thermal uniformity, stability, loading effect and immersion depth.
Automated Calibration Procedures
The Fluke Calibration 9171 includes programmable calibration functions.
The instrument supports predefined temperature calibration procedures.
Users can configure temperature setpoints and appropriate stabilization periods.
This helps simplify repeated calibration procedures.
The instrument can automatically move between selected temperature setpoints without requiring continuous manual adjustment.
These functions are particularly useful when calibrating temperature sensors at several temperatures.
Automatic Temperature Switch Testing
The Fluke Calibration 9171 supports automatic temperature switch testing.
Temperature switches are widely used in industrial process control and safety systems.
The automatic test function simplifies the determination of switching temperatures and switching hysteresis.
This helps improve efficiency during routine maintenance and calibration procedures.
RS232 Communication and Automation
The Fluke Calibration 9171 features an integrated RS232 communication interface.
This allows the instrument to communicate with a computer or compatible calibration software.
The interface supports remote operation and integration into automated calibration procedures.
Automated calibration can help reduce manual work and improve the consistency of repeated measurements.
The instrument can also be operated independently without a computer.
Technical Highlights
| Specification | Fluke Calibration 9171 |
|---|---|
| Manufacturer | Fluke Calibration |
| Model | 9171 |
| Product type | Metrology Well |
| Temperature range | −30 °C to +155 °C |
| Reference ambient temperature | 23 °C |
| Display accuracy | ±0.1 °C |
| Temperature stability | ±0.005 °C |
| Axial uniformity at −30 °C | ±0.025 °C |
| Axial uniformity at 0 °C | ±0.02 °C |
| Axial uniformity at 155 °C | ±0.07 °C |
| Radial uniformity | ±0.01 °C |
| Loading effect at −30 °C | ±0.005 °C |
| Loading effect at 0 °C | ±0.005 °C |
| Loading effect at 155 °C | ±0.01 °C |
| Hysteresis | 0.025 °C |
| Temperature resolution | 0.001 °C |
| Calibration well depth | 203 mm |
| Cooling time, 23 °C to −30 °C | 30 minutes |
| Cooling time, 155 °C to 23 °C | 25 minutes |
| Heating time, 23 °C to 155 °C | 44 minutes |
| Heating time, −30 °C to 155 °C | 56 minutes |
| Calibration inserts | A, B, C, D, E, F |
| Optional reference input | Available |
| Reference readout | ITS 90 and CVD |
| Temperature switch testing | Supported |
| Communication interface | RS232 |
| Dimensions | 366 × 203 × 323 mm |
| Weight | Approximately 15 kg |
| Power supply | 115 V or 230 V AC |
| Power consumption | 550 W |
| Calibration documentation | NIST traceable calibration included |
Fluke Calibration 9171 or Fluke Calibration 9170?
The Fluke Calibration 9171 and Fluke Calibration 9170 belong to the same family of precision metrology wells.
Both instruments provide excellent temperature stability and thermal uniformity.
However, they differ in temperature range and calibration well depth.
The Fluke Calibration 9171 operates from −30 °C to +155 °C.
The Fluke Calibration 9170 operates from −45 °C to +140 °C.
The Fluke Calibration 9171 features a calibration well depth of 203 mm.
The Fluke Calibration 9170 provides a calibration well depth of 160 mm.
Both instruments offer temperature stability of ±0.005 °C.
The Fluke Calibration 9171 is particularly suitable for applications requiring deeper immersion.
The Fluke Calibration 9170 is designed for applications requiring lower temperatures.
The appropriate instrument depends on the required temperature range, sensor dimensions and measurement uncertainty requirements.
Calibration Service by europascal
Regular calibration is essential for maintaining reliable temperature measurements.
europascal provides professional calibration services for temperature measuring instruments and calibration equipment.
When calibrating a metrology well, several characteristics must be considered.
These include temperature indication error, stability, axial temperature uniformity, radial temperature uniformity, loading effects and hysteresis.
The overall measurement uncertainty also depends on the reference thermometer and its calibration uncertainty.
For professional calibration services and metrological traceability, visit the europascal Calibration Service.
europascal also supports customers in selecting suitable reference thermometers, calibration inserts and complete temperature calibration systems.
Why Choose the Fluke Calibration 9171?
The Fluke Calibration 9171 combines exceptional temperature stability with a deep calibration well and excellent thermal uniformity.
Its temperature range from −30 °C to +155 °C makes it suitable for numerous industrial and laboratory calibration applications.
Temperature stability of ±0.005 °C provides reproducible calibration conditions.
The calibrated temperature display offers an accuracy of ±0.1 °C throughout the operating range.
Excellent radial temperature uniformity of ±0.01 °C supports accurate comparison calibration.
The 203 mm calibration well depth helps reduce errors caused by insufficient immersion.
Interchangeable calibration inserts allow different sensor diameters to be accommodated.
The optional integrated reference thermometer input provides additional flexibility for high precision temperature measurements.
Programmable calibration procedures, automatic temperature switch testing and RS232 communication support efficient calibration workflows.
For professional calibration laboratories requiring excellent metrological performance and deep sensor immersion, the Fluke Calibration 9171 provides a reliable and versatile solution.
europascal supports customers with temperature calibration equipment, technical advice and professional calibration services.
Typical Calibration Applications with the Fluke Calibration 9171
The Fluke Calibration 9171 is suitable for calibrating platinum resistance thermometers, precision resistance thermometers, industrial RTDs, thermistors and other compatible temperature sensors.
Typical applications include pharmaceutical production, laboratory temperature measurement, industrial process instrumentation, refrigeration systems, environmental chambers, quality assurance and calibration laboratories.
The combination of excellent temperature stability, deep calibration well, well-characterized thermal uniformity and automated calibration functions makes the Fluke Calibration 9171 a professional solution for demanding temperature calibration applications.
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