The Fluke Calibration 1523 is a high-precision handheld reference thermometer designed for accurate temperature measurement in calibration laboratories, industrial environments and field applications. Developed by Fluke Calibration, the 1523 combines excellent measurement accuracy, versatile sensor compatibility and advanced temperature monitoring functions in a compact, portable instrument.
The Fluke Calibration 1523 supports platinum resistance thermometers (PRTs), resistance temperature detectors (RTDs), thermistors and thermocouples. This flexibility allows technicians to perform a wide range of temperature measurements using a single reference thermometer readout.
With a readout accuracy of up to ±0.002 °C when measuring precision thermistors, the Fluke Calibration 1523 provides excellent performance for demanding temperature measurement applications.
The instrument supports PRT temperature measurements from −200 °C to +1000 °C, thermocouple measurements from −200 °C to +2315 °C, and precision thermistor measurements from −50 °C to +150 °C.
Its illuminated graphical display allows users to view temperature readings and monitor temperature trends in real time. Measurement values can be stored and evaluated using integrated statistical functions.
The Fluke Calibration 1523 features a single measurement channel and supports fast measurement rates down to 0.3 seconds per reading, depending on the sensor type.
Intelligent sensor connectors simplify operation by automatically transferring stored sensor information to the instrument.
At europascal, the Fluke Calibration 1523 provides a professional solution for precise temperature measurement and reference temperature applications. europascal supports customers with reference thermometers, temperature calibration equipment and professional calibration services.
For reliable measurement results and metrological traceability, visit the europascal Calibration Service.
Your Benefits at a Glance
- High-precision handheld reference thermometer
- Measurement accuracy down to ±0.002 °C with precision thermistors
- Compatible with platinum resistance thermometers
- Compatible with industrial RTDs
- Compatible with precision thermistors
- Compatible with thermocouples
- PRT measurement range from −200 °C to +1000 °C
- Thermocouple measurement range from −200 °C to +2315 °C
- Thermistor measurement range from −50 °C to +150 °C
- Single measurement channel
- Fast measurement rates down to 0.3 seconds
- Illuminated graphical LCD
- Real-time temperature trend display
- Storage of 25 measurement readings
- Integrated statistical evaluation
- Intelligent sensor connectors
- Automatic recognition of stored probe coefficients
- Resistance measurement up to 500 kΩ
- Millivolt measurement for thermocouples
- Compatible with Fluke LogWare II software
- Battery-powered operation
- Compact and rugged construction
- Suitable for laboratory and field calibration
- Professional calibration support from europascal
High-Precision Temperature Measurement
The Fluke Calibration 1523 is designed for applications requiring accurate and repeatable temperature measurements.
The instrument supports several sensor technologies, allowing users to select the most suitable temperature probe for their application.
The manufacturer specifies the following best-case readout accuracies:
Precision thermistors: ±0.002 °C
Platinum resistance thermometers: ±0.011 °C
Thermocouples: ±0.24 °C for selected thermocouple types and temperature ranges
These specifications refer to the measurement performance of the thermometer readout under defined conditions.
The accuracy of a complete temperature measurement system also depends on the connected sensor, its calibration, stability and operating conditions.
This makes the Fluke Calibration 1523 particularly suitable for professional reference temperature measurements.
Wide Temperature Measurement Range
The Fluke Calibration 1523 supports three important temperature sensor technologies.
Platinum Resistance Thermometers
−200 °C to +1000 °C
PRTs provide excellent accuracy and stability and are widely used in temperature calibration laboratories.
Thermocouples
−200 °C to +2315 °C
Thermocouples are particularly useful for industrial applications requiring high-temperature measurements.
Precision Thermistors
−50 °C to +150 °C
Precision thermistors offer excellent sensitivity and accuracy over relatively limited temperature ranges.
The actual usable measurement range depends on the connected sensor and its calibration.
Platinum Resistance Thermometer Measurement
The Fluke Calibration 1523 supports platinum resistance thermometers, commonly referred to as PRTs.
PRTs are widely used as reference temperature sensors because of their excellent stability and reproducibility.
The instrument measures the electrical resistance of the connected PRT and converts the measured resistance into temperature.
The Fluke Calibration 1523 supports calibrated PRT characteristics and sensor-specific coefficients.
This allows the thermometer readout to be used with high-accuracy reference temperature probes.
Typical applications include:
- Reference temperature measurements
- Calibration bath monitoring
- Temperature comparison calibration
- Industrial temperature verification
- Laboratory temperature metrology
RTD Temperature Measurement
The Fluke Calibration 1523 also supports industrial resistance temperature detectors.
These include common Pt100 and other supported RTD characteristics.
RTDs are widely used in industrial processes because of their stability, accuracy and relatively simple construction.
The Fluke Calibration 1523 measures the sensor resistance and converts it into a temperature indication according to the selected characteristic.
For accurate results, the correct sensor type and measurement configuration must be selected.
The instrument supports high-accuracy resistance measurements suitable for professional temperature measurement applications.
Precision Thermistor Measurement
One of the most important features of the Fluke Calibration 1523 is its compatibility with precision thermistors.
Thermistors are temperature-dependent resistors that provide excellent sensitivity over limited temperature ranges.
The manufacturer specifies a readout accuracy down to:
±0.002 °C
This value applies to thermistor measurement at 0 °C under the specified conditions.
The corresponding readout accuracy depends on temperature.
Typical manufacturer specifications include:
| Temperature | Thermistor Readout Accuracy |
|---|---|
| 0 °C | ±0.002 °C |
| 25 °C | ±0.003 °C |
| 50 °C | ±0.006 °C |
| 75 °C | ±0.014 °C |
| 100 °C | ±0.030 °C |
These values demonstrate the excellent measurement performance available with precision thermistors.
Thermistors are particularly suitable for accurate temperature measurements near room temperature.
Thermocouple Measurement
The Fluke Calibration 1523 supports twelve thermocouple types.
Supported thermocouple types include:
- Type B
- Type C
- Type E
- Type J
- Type K
- Type L
- Type M
- Type N
- Type R
- Type S
- Type T
- Type U
This provides compatibility with a wide range of industrial temperature measurement applications.
Thermocouples generate a thermoelectric voltage depending on the temperature difference between the measuring junction and the reference junction.
The Fluke Calibration 1523 measures the thermoelectric voltage and converts it into temperature according to the selected thermocouple characteristic.
The instrument supports internal reference junction compensation.
This simplifies thermocouple measurements in industrial environments.
High-Accuracy Resistance Measurement
The Fluke Calibration 1523 provides precision resistance measurement for PRTs, RTDs and thermistors.
The instrument supports resistance measurements up to:
500 kΩ
The manufacturer specifies different resistance measurement ranges.
Low Resistance Range
0 Ω to 400 Ω
Accuracy:
±(0.004% of reading + 0.002 Ω)
Medium Resistance Range
200 Ω to 50 kΩ
Accuracy:
±(0.01% of reading + 0.5 Ω)
High Resistance Range
50 kΩ to 500 kΩ
Accuracy:
±0.03% of reading
The appropriate measurement range is selected according to the connected sensor.
The resistance measurement accuracy directly influences the calculated temperature measurement result.
Millivolt Measurement
The Fluke Calibration 1523 provides millivolt measurement for thermocouple applications.
The manufacturer specifies a measurement range from:
−10 mV to +75 mV
The specified accuracy is:
±(0.005% of reading + 5 µV)
This allows the instrument to measure thermoelectric voltages generated by supported thermocouple types.
The temperature indication is calculated according to the selected thermocouple characteristic.
Fast Temperature Measurements
The Fluke Calibration 1523 provides fast measurement rates.
In normal operating mode, the instrument performs approximately:
One measurement per second
A fast measurement mode is available for applications requiring shorter sampling intervals.
Typical fast-mode sampling intervals are:
PRTs: 0.45 seconds
Thermocouples: 0.3 seconds
Thermistors: 0.3 seconds
These measurement rates allow users to monitor temperature changes efficiently.
Fast sampling is particularly useful when evaluating temperature stability or observing changing temperature conditions.
The manufacturer specifies different accuracy characteristics for fast measurement mode.
Graphical Temperature Display
The Fluke Calibration 1523 features a graphical LCD.
The manufacturer specifies a display resolution of:
128 × 64 pixels
The illuminated display provides clear temperature indications and graphical measurement information.
The instrument can display temperature trends in real time.
This allows users to observe temperature changes without requiring an external computer.
The graphical display is particularly useful when monitoring the stability of calibration baths and temperature-controlled environments.
Real-Time Temperature Trend Monitoring
The Fluke Calibration 1523 allows temperature measurements to be displayed graphically.
The instrument can show changes in temperature over time.
Users can adjust the graphical display to evaluate temperature trends.
This function is particularly useful for:
- Temperature stability measurements
- Calibration bath monitoring
- Temperature drift evaluation
- Laboratory measurements
- Industrial temperature monitoring
The graphical display simplifies the identification of temperature fluctuations.
Measurement Storage and Statistics
The Fluke Calibration 1523 includes internal memory for:
25 measurement readings
The instrument also provides statistical evaluation functions.
These functions allow users to evaluate stored measurement data.
Statistical analysis is useful when determining temperature stability and repeatability.
For applications requiring extensive data logging, the Fluke Calibration 1524 provides additional memory capacity and time-stamped recording functions.
Intelligent Sensor Connectors
The Fluke Calibration 1523 supports intelligent sensor connectors.
These connectors can store information about the connected temperature probe.
The stored information may include sensor identification and calibration coefficients.
When a compatible probe is connected, the thermometer readout automatically retrieves the stored information.
This reduces the need for manual configuration.
It also helps prevent errors caused by incorrect sensor coefficients.
The intelligent connector system is particularly useful in laboratories where several reference temperature probes are used.
Reference Temperature Measurements
The Fluke Calibration 1523 is suitable for use as a reference thermometer readout.
When combined with a calibrated temperature probe, it provides a reliable reference temperature measurement system.
Typical applications include temperature comparison calibration and monitoring of calibration equipment.
The instrument can be used with temperature calibration baths, dry-block calibrators and other stable temperature sources.
The overall measurement uncertainty depends on the selected reference probe and the calibration conditions.
Temperature Calibration Baths
The Fluke Calibration 1523 is particularly useful for reference measurements in liquid calibration baths.
A calibrated temperature probe is immersed in the bath.
The thermometer readout measures the sensor signal and calculates the corresponding temperature.
The measured reference temperature can then be compared with the indication of the device under test.
This method is commonly used for comparison calibration of temperature sensors.
The measurement uncertainty must consider the reference thermometer, bath stability, bath homogeneity and immersion conditions.
Dry-Block Temperature Calibration
The Fluke Calibration 1523 can also be used with dry-block temperature calibrators.
A calibrated reference temperature probe is inserted into a suitable calibration insert.
The thermometer readout measures the actual reference temperature.
This allows the displayed temperature of the dry-block calibrator to be verified.
The instrument can also be used as a reference thermometer during calibration of industrial temperature sensors.
The Fluke Calibration 1523 measures temperature but does not generate a physical temperature.
Fluke LogWare II Software
The Fluke Calibration 1523 is compatible with optional Fluke LogWare II software.
LogWare II supports computer-based temperature monitoring and data acquisition.
The software can be used to record temperature measurements over time.
Typical applications include:
- Temperature data logging
- Temperature stability analysis
- Calibration bath monitoring
- Measurement documentation
- Temperature trend evaluation
This extends the functionality of the thermometer readout beyond its internal measurement memory.
Portable Battery-Powered Operation
The Fluke Calibration 1523 is designed for portable temperature measurements.
The instrument is powered by:
Three AA alkaline batteries
Battery operation makes the thermometer suitable for use in locations where mains power is unavailable.
The compact construction and illuminated display make the instrument convenient for field applications.
Its rugged housing provides protection during routine industrial use.
Compact Dimensions
The manufacturer specifies the following dimensions:
96 × 200 × 47 mm
The weight is approximately:
0.65 kg
This makes the Fluke Calibration 1523 easy to transport between different measurement locations.
The compact design is suitable for laboratory benches and mobile calibration setups.
Technical Highlights
| Feature | Fluke Calibration 1523 |
|---|---|
| Product type | Handheld Reference Thermometer |
| Manufacturer | Fluke Calibration |
| Measurement channels | 1 |
| Supported sensors | PRT, RTD, Thermistor, Thermocouple |
| PRT temperature range | −200 °C to +1000 °C |
| Thermocouple temperature range | −200 °C to +2315 °C |
| Thermistor temperature range | −50 °C to +150 °C |
| Best PRT readout accuracy | ±0.011 °C |
| Best thermistor readout accuracy | ±0.002 °C |
| Thermocouple readout accuracy | From ±0.24 °C, depending on type and range |
| Supported thermocouple types | 12 |
| Resistance measurement | Up to 500 kΩ |
| Millivolt measurement | −10 mV to +75 mV |
| Normal sampling interval | 1 second |
| Fast sampling, PRT | 0.45 seconds |
| Fast sampling, thermocouple | 0.3 seconds |
| Fast sampling, thermistor | 0.3 seconds |
| Display | Graphical LCD |
| Display resolution | 128 × 64 pixels |
| Backlight | Yes |
| Measurement memory | 25 readings |
| Statistical evaluation | Yes |
| Intelligent sensor connectors | Supported |
| Compatible software | Fluke LogWare II |
| Operating temperature | −10 °C to +60 °C |
| Ambient temperature for best accuracy | +13 °C to +33 °C |
| Power supply | 3 AA alkaline batteries |
| Dimensions | 96 × 200 × 47 mm |
| Weight | 0.65 kg |
| Product status | Discontinued |
Fluke Calibration 1523 vs. Fluke Calibration 1524
The Fluke Calibration 1523 and 1524 belong to the same reference thermometer series.
Both instruments support PRTs, RTDs, thermistors and thermocouples.
The main differences are the number of measurement channels and data logging capabilities.
| Feature | Fluke 1523 | Fluke 1524 |
|---|---|---|
| Measurement channels | 1 | 2 |
| PRT measurement | Yes | Yes |
| Thermocouple measurement | Yes | Yes |
| Thermistor measurement | Yes | Yes |
| Graphical display | Yes | Yes |
| Internal memory | 25 readings | 15,000 logged readings |
| Statistical evaluation | Yes | Yes |
| Time and date stamps | No | Yes |
| Simultaneous measurement of two sensors | No | Yes |
The Fluke Calibration 1523 is suitable for applications requiring a single reference thermometer channel.
The Fluke Calibration 1524 is particularly useful when two temperature sensors must be measured simultaneously.
Compatible Temperature Probes
The Fluke Calibration 1523 can be combined with different compatible temperature probes.
Examples include:
- Fluke 5616 PRT
- Fluke 5615 PRT
- Fluke 5627A PRT
- Fluke 5610 thermistor
- Compatible thermocouple probes
The appropriate probe should be selected according to the required temperature range, accuracy and measurement application.
For the highest measurement accuracy, a calibrated probe with suitable sensor coefficients should be used.
Typical Applications
The Fluke Calibration 1523 is suitable for:
- Reference temperature measurements
- Temperature calibration laboratories
- PRT temperature measurement
- Pt100 temperature measurement
- RTD temperature measurement
- Precision thermistor measurement
- Thermocouple measurement
- Temperature comparison calibration
- Temperature calibration bath monitoring
- Dry-block temperature calibration
- Temperature stability measurements
- Temperature trend monitoring
- Industrial temperature measurement
- Quality assurance
- Research laboratories
- Pharmaceutical laboratories
- Production testing
- Field temperature calibration
- Temperature metrology
Calibration by europascal
Regular calibration is essential for maintaining reliable temperature measurement results.
europascal provides professional calibration services for temperature measuring instruments and reference temperature measurement systems.
The Fluke Calibration 1523 can be calibrated to verify its resistance and voltage measurement functions.
When combined with a calibrated temperature probe, the instrument can be used as part of a traceable reference temperature measurement system.
For professional calibration and metrological traceability, visit the europascal Calibration Service.
europascal also supports customers with the selection of suitable reference temperature probes and temperature calibration equipment.
Why Choose the Fluke Calibration 1523?
The Fluke Calibration 1523 combines high measurement accuracy, versatile sensor compatibility and convenient graphical monitoring functions in a compact handheld instrument.
Its support for PRTs, RTDs, thermistors and thermocouples makes it suitable for many temperature measurement applications.
Readout accuracy down to ±0.002 °C with precision thermistors provides excellent measurement performance.
The graphical display allows temperature trends to be monitored directly on the instrument.
Fast measurement rates down to 0.3 seconds support applications requiring rapid temperature monitoring.
Intelligent sensor connectors simplify operation and reduce configuration errors.
The internal memory and statistical functions support the evaluation of measurement results.
Battery-powered operation and compact dimensions make the instrument suitable for laboratory and field applications.
For professional users requiring a portable and precise reference thermometer, the Fluke Calibration 1523 provides an excellent combination of accuracy, flexibility and ease of use.
The Fluke Calibration 1523 has been discontinued by the manufacturer. For new installations requiring similar measurement capabilities, the Fluke Calibration 1524 is the manufacturer’s recommended alternative.
europascal supports customers with temperature calibration equipment, reference thermometers and professional calibration services.
