The Fluke Calibration 5627A is a high-precision platinum resistance thermometer designed for accurate temperature measurements, reference thermometry and professional temperature calibration applications.
With a temperature measurement range from −200 °C to +420 °C, a nominal resistance of 100 Ω at 0 °C and a temperature coefficient of 0.00385 Ω/Ω/°C, the Fluke Calibration 5627A combines excellent metrological performance with a durable industrial probe design.
The instrument belongs to the Fluke Calibration family of precision industrial platinum resistance thermometers (PRTs). Its resistance-temperature characteristic follows the standard 385 curve, allowing compatibility with suitable thermometer readouts configured for industrial Pt100 sensors.
Unlike conventional industrial temperature probes, the Fluke Calibration 5627A is individually calibrated and supplied with an accredited manufacturer calibration certificate, including ITS-90 coefficients and resistance-temperature data.
The sensor features a mineral-insulated stainless steel sheath and a coil-suspended sensing element designed to improve resistance to mechanical shock and vibration.
Three probe lengths are available, allowing users to select the appropriate configuration for laboratory measurements, temperature calibration baths, dry block calibrators and industrial applications.
For professional calibration services and metrological traceability, visit the europascal Calibration Service.
Your Benefits at a Glance
- Temperature measurement range from −200 °C to +420 °C
- Three different probe lengths available
- High-precision platinum resistance thermometer
- Nominal resistance of 100 Ω at 0 °C
- Standard temperature coefficient of 0.00385 Ω/Ω/°C
- Compatible with suitable DIN/IEC Pt100 thermometer readouts
- Individually calibrated reference temperature probe
- NVLAP-accredited manufacturer calibration included
- Individual ITS-90 calibration coefficients
- Resistance-temperature calibration table
- Calibrated accuracy of ±0.046 °C at 0 °C
- Stainless steel 316 probe sheath
- Mineral-insulated construction
- Coil-suspended sensing element
- Improved shock and vibration resistance
- Fast thermal response
- Response time constant of 4 seconds maximum under specified conditions
- Minimum recommended immersion depth of 100 mm
- Optional bent probe configuration
- Different electrical termination options
- Suitable for calibration baths and dry block calibrators
- Suitable for laboratory and industrial reference measurements
- Professional calibration support from europascal
High-Precision Temperature Measurement
The Fluke Calibration 5627A is designed for applications requiring accurate and repeatable temperature measurements.
Platinum resistance thermometers are widely used in temperature metrology because of their predictable resistance-temperature relationship, excellent repeatability and long-term stability.
The Fluke Calibration 5627A combines these advantages with individual calibration and a mechanically durable construction.
Its calibrated accuracy makes it suitable for demanding industrial reference measurements and temperature comparison calibrations.
The instrument is particularly useful when a conventional industrial Pt100 does not provide sufficient measurement performance.
For accurate temperature measurements, the probe must be connected to a suitable precision thermometer readout.
The overall measurement uncertainty depends on the reference probe, readout, measurement configuration and environmental conditions.
Temperature Range from −200 °C to +420 °C
The Fluke Calibration 5627A is available in three versions with different temperature ranges.
The shorter 152 mm and 229 mm versions cover:
−200 °C to +300 °C
The longer 305 mm version covers:
−200 °C to +420 °C
This makes the Fluke Calibration 5627A suitable for a wide range of low-temperature and industrial temperature measurement applications.
The lower temperature limit allows measurements in cryogenic calibration environments.
The upper temperature limit of 420 °C makes the longest version suitable for demanding high-temperature reference measurements.
The correct version should be selected according to the required temperature range, immersion depth and installation conditions.
Standard Pt100 Characteristic
One of the important advantages of the Fluke Calibration 5627A is its standard platinum resistance characteristic.
The nominal resistance is:
100 Ω at 0 °C
The nominal temperature coefficient is:
0.00385 Ω/Ω/°C
This corresponds to the standard 385 characteristic commonly used for industrial platinum resistance thermometers.
The sensor can therefore be used with suitable thermometer readouts supporting the standard industrial Pt100 characteristic.
For maximum measurement accuracy, the individual calibration coefficients supplied with the probe should be used whenever the connected readout supports them.
Calibrated Accuracy
The Fluke Calibration 5627A provides excellent calibrated measurement performance.
The manufacturer specifies the following representative calibrated accuracy values.
| Temperature | Calibrated Accuracy (k = 2) |
|---|---|
| −196 °C | ±0.026 °C |
| 0 °C | ±0.046 °C |
| +200 °C | ±0.077 °C |
| +420 °C | ±0.124 °C |
These specifications include calibration uncertainty and the specified drift contribution after 100 hours.
The values should not be confused with the expanded calibration uncertainty stated on the individual calibration certificate.
The measurement uncertainty of the connected thermometer readout must also be considered.
Accredited Calibration Included
Each Fluke Calibration 5627A is individually calibrated by the manufacturer.
The probe is supplied with an accredited calibration certificate.
The calibration includes resistance-temperature measurements at defined calibration points.
For the 152 mm and 229 mm versions, the calibration points are:
- −196 °C
- −38 °C
- 0 °C
- +200 °C
- +300 °C
For the 305 mm version, the +300 °C calibration point is replaced by:
+420 °C
The calibration documentation also includes individual ITS-90 coefficients.
These coefficients allow accurate temperature conversion using a compatible precision thermometer readout.
Resistance-Temperature Calibration Table
The Fluke Calibration 5627A is supplied with a resistance-versus-temperature calibration table.
The table provides resistance values in:
1 °C increments
For the shorter probe versions, the table extends to +300 °C.
For the longer version, it extends to +420 °C.
This information allows users to evaluate the sensor resistance and calculate corresponding temperature values.
The individual calibration data provide improved accuracy compared with using only a generic Pt100 characteristic.
Three Available Probe Lengths
The Fluke Calibration 5627A is available in three mechanical configurations.
Fluke Calibration 5627A-6
The 5627A-6 features a probe length of:
152 mm (6 inches)
Probe diameter:
4.7 mm
Temperature range:
−200 °C to +300 °C
This compact version is suitable for applications with limited installation space.
Fluke Calibration 5627A-9
The 5627A-9 features a probe length of:
229 mm (9 inches)
Probe diameter:
4.7 mm
Temperature range:
−200 °C to +300 °C
This version provides additional immersion depth while maintaining a relatively compact probe diameter.
Fluke Calibration 5627A-12
The 5627A-12 features a probe length of:
305 mm (12 inches)
Probe diameter:
6.35 mm
Temperature range:
−200 °C to +420 °C
The longer probe is particularly suitable for applications requiring greater immersion depth and higher operating temperatures.
Stainless Steel 316 Probe Sheath
The Fluke Calibration 5627A features a stainless steel 316 probe sheath.
Stainless steel 316 provides good corrosion resistance and mechanical durability for many laboratory and industrial applications.
The sheath protects the platinum resistance sensing element against mechanical damage.
The mineral-insulated construction contributes to the durability and flexibility of the probe.
The chemical compatibility of the sheath material should be checked before use in aggressive media.
Shock and Vibration Resistance
The Fluke Calibration 5627A uses a coil-suspended sensing element.
This design improves resistance to mechanical shock and vibration.
Conventional precision platinum resistance thermometers can be sensitive to mechanical stress.
The coil-suspended construction provides additional protection for the sensing element.
This makes the Fluke Calibration 5627A particularly suitable for industrial applications where a mechanically robust reference temperature probe is required.
Nevertheless, the probe should be handled carefully to maintain its calibrated performance.
Flexible Probe Construction
The Fluke Calibration 5627A features a mineral-insulated sheath that can be supplied with a bend.
The manufacturer specifies a minimum bending radius of:
19 mm
The final 50 mm near the probe tip must remain straight.
The required bend should be specified when ordering.
For recalibration at the manufacturer’s laboratory, approximately 200 mm of straight sheath is required.
This should be considered when selecting a bent probe configuration.
Fast Response Time
The Fluke Calibration 5627A provides a fast response to temperature changes.
The manufacturer specifies a maximum time constant of:
4 seconds
This corresponds to a 63.2% response to a temperature step in water moving at approximately 0.91 m/s.
The actual response time depends on the measurement medium, immersion depth, thermal contact and flow conditions.
The relatively fast response makes the probe suitable for repeated temperature measurements and comparison calibration procedures.
Minimum Immersion Depth
For accurate temperature measurements, sufficient immersion depth is essential.
Fluke Calibration recommends a minimum immersion depth of:
100 mm
Insufficient immersion can cause heat conduction along the probe stem.
This may result in a difference between the temperature of the sensing element and the actual temperature of the calibration medium.
For demanding reference measurements, immersion effects should be evaluated as part of the measurement uncertainty budget.
Long-Term Stability
Long-term stability is an important characteristic of precision platinum resistance thermometers.
The Fluke Calibration 5627A provides stable measurement performance under specified operating conditions.
The manufacturer specifies a drift contribution of:
±0.04 °C at 0 °C after 100 hours at 420 °C
This value describes the specified drift behavior under the stated test conditions.
It should not be interpreted as a general annual drift specification.
Regular calibration is recommended to verify the long-term performance of the probe.
Connecting Cable and Temperature Limits
The Fluke Calibration 5627A uses PTFE-insulated, nickel-plated stranded copper conductors.
The conductor size is:
22 AWG
The manufacturer specifies a temperature range for the transition and cable assembly of:
0 °C to +150 °C
The temperature limits of the cable and transition junction must be observed independently of the probe’s measurement range.
The high-temperature capability of the sensing sheath does not mean that the complete cable assembly may be exposed to the same temperature.
Electrical Termination Options
The Fluke Calibration 5627A is available with different electrical termination options.
These include:
- INFO-CON for compatible 914X instruments
- Bare wires
- Five-pin DIN connector
- Gold-plated pins
- Banana plugs
- Miniature spade lugs
- Miniature banana plugs
- INFO-CON for 1523 and 1524
- Spade lugs
The appropriate termination must be specified when ordering.
The connector should match the intended thermometer readout and measurement configuration.
Compatible Thermometer Readouts
The Fluke Calibration 5627A requires a suitable precision thermometer readout.
The probe can be used with compatible instruments supporting the standard Pt100 characteristic.
Examples include suitable Fluke Calibration thermometer readouts such as the 1523, 1524 and 1502A.
For demanding reference measurements, a four-wire resistance measurement configuration is recommended.
Four-wire measurement minimizes the influence of connecting lead resistance.
When supported by the readout, the individual ITS-90 coefficients should be used for temperature conversion.
Reference Measurements in Calibration Baths
The Fluke Calibration 5627A is well suited for precision temperature measurements in liquid calibration baths.
Liquid baths provide good thermal contact between the reference thermometer and the calibration medium.
The probe can be positioned close to the device under test to minimize temperature differences.
For accurate comparison calibration, sufficient immersion depth and thermal stabilization are essential.
The measurement uncertainty should include the calibration uncertainty of the reference thermometer, readout uncertainty, bath stability and temperature uniformity.
Measurements in Dry Block Calibrators
The Fluke Calibration 5627A can also be used in suitable dry block temperature calibrators.
The probe should be inserted into a correctly sized calibration insert.
Good thermal contact between the probe and insert is important for minimizing measurement errors.
The selected probe length should provide sufficient immersion depth.
For demanding measurements, axial temperature gradients, radial temperature uniformity and loading effects should be considered.
Technical Highlights
| Specification | Fluke Calibration 5627A |
|---|---|
| Manufacturer | Fluke Calibration |
| Model | 5627A |
| Product type | Precision Reference RTD Probe |
| Sensor technology | Platinum resistance thermometer |
| Nominal resistance | 100 Ω at 0 °C |
| Temperature coefficient | 0.00385 Ω/Ω/°C |
| Temperature range, 6-inch version | −200 °C to +300 °C |
| Temperature range, 9-inch version | −200 °C to +300 °C |
| Temperature range, 12-inch version | −200 °C to +420 °C |
| Probe diameter, 6-inch version | 4.7 mm |
| Probe diameter, 9-inch version | 4.7 mm |
| Probe diameter, 12-inch version | 6.35 mm |
| Probe lengths | 152, 229 or 305 mm |
| Sheath material | Stainless steel 316 |
| Sheath construction | Mineral-insulated |
| Sensing element | Coil-suspended |
| Calibrated accuracy at 0 °C | ±0.046 °C |
| Calibrated accuracy at 200 °C | ±0.077 °C |
| Drift after 100 h at 420 °C | ±0.04 °C at 0 °C |
| Response time constant | ≤4 seconds under specified conditions |
| Minimum recommended immersion | 100 mm |
| Minimum bending radius | 19 mm |
| Cable conductors | 22 AWG |
| Cable insulation | PTFE |
| Cable temperature range | 0 °C to +150 °C |
| Calibration | Accredited manufacturer calibration included |
| Calibration coefficients | ITS-90 |
| Resistance-temperature table | 1 °C increments |
| Electrical termination | Various options |
| Typical applications | Reference thermometry and temperature calibration |
Fluke Calibration 5627A or 5618B?
The Fluke Calibration 5627A and Fluke Calibration 5618B are both precision platinum resistance thermometers designed for demanding temperature measurements.
The Fluke Calibration 5627A uses a nominal temperature coefficient of:
0.00385 Ω/Ω/°C
This corresponds to the standard industrial Pt100 characteristic.
The Fluke Calibration 5618B uses a nominal temperature coefficient of:
0.003923 Ω/Ω/°C
The 5627A is therefore particularly suitable for applications requiring compatibility with standard industrial Pt100 thermometer readouts.
The 5618B provides a different platinum resistance characteristic and a smaller probe diameter.
The correct model should be selected according to the required temperature range, sensor characteristic, mechanical dimensions and measurement uncertainty.
Calibration Service by europascal
Regular calibration is essential for maintaining reliable and traceable temperature measurements.
europascal provides professional calibration services for temperature measuring instruments and reference thermometers.
When the Fluke Calibration 5627A is used as a reference thermometer, the uncertainty stated on its calibration certificate should be considered together with the uncertainty of the connected thermometer readout.
Additional uncertainty contributions may include temperature source stability, spatial temperature uniformity, immersion effects, repeatability and long-term drift.
For professional calibration services and metrological traceability, visit the europascal Calibration Service.
Why Choose the Fluke Calibration 5627A?
The Fluke Calibration 5627A combines high-precision temperature measurement with a robust industrial probe design.
Its temperature range from −200 °C to +420 °C covers demanding low-temperature and high-temperature applications.
The standard Pt100 characteristic provides compatibility with suitable DIN/IEC thermometer readouts.
Individual ITS-90 calibration coefficients and an accredited manufacturer calibration support traceable reference measurements.
The stainless steel 316 sheath and coil-suspended sensing element provide improved resistance to mechanical shock and vibration.
Three available probe lengths allow the sensor to be selected according to the required temperature range and installation conditions.
For calibration laboratories, research facilities and industrial users requiring a precise and durable reference temperature probe, the Fluke Calibration 5627A provides an excellent combination of accuracy, flexibility and measurement stability.
europascal supports customers with professional temperature calibration equipment, technical advice and calibration services.
Typical Applications for the Fluke Calibration 5627A
Typical applications include:
- Precision temperature measurements
- Secondary reference thermometry
- RTD comparison calibration
- Pt100 calibration
- Calibration bath monitoring
- Dry block calibration
- Temperature stability measurements
- Low-temperature calibration
- Industrial temperature calibration
- Research and development
- Quality assurance
- Calibration laboratories
- Temperature metrology
The combination of a wide temperature range, standard Pt100 characteristic, accredited calibration and robust mechanical construction makes the Fluke Calibration 5627A a professional solution for demanding temperature measurement applications.
Find more Fluke Calibration products here.
Manufacturer information for the Fluke Calibration 5627A can be found on the official Fluke Calibration website.
