The Additel AccuMac AM 1751 is a high-quality secondary reference platinum resistance thermometer designed for accurate temperature measurements and professional temperature calibration applications.

With a temperature range from −200 °C to +670 °C, excellent short-term stability of less than 0.007 °C and a robust Inconel sheath, the AccuMac AM 1751 provides reliable performance for demanding laboratory and industrial applications.

The thermometer meets the relevant ITS-90 criteria for reference thermometers and is supplied with an ISO/IEC 17025 accredited calibration.

Its combination of measurement stability, mechanical durability and a wide temperature range makes it an excellent choice for calibration laboratories, temperature metrology and industrial quality assurance.

The AccuMac AM 1751 is particularly suitable for use with precision thermometer readouts, calibration baths, dry block calibrators and comparison calibration systems.

For professional temperature calibration and metrological traceability, visit the europascal Calibration Service.

Your Benefits at a Glance

• Secondary reference platinum resistance thermometer
• Wide temperature range from −200 °C to +670 °C
• Excellent short-term stability below 0.007 °C
• Robust Inconel protective sheath
• Meets ITS-90 criteria for reference thermometers
• ISO/IEC 17025 accredited calibration included
• Suitable for precision temperature measurements
• Designed for comparison calibration
• Suitable for calibration baths
• Suitable for dry block calibrators
• Compatible with suitable precision resistance thermometer readouts
• Suitable for laboratory temperature metrology
• Durable construction for demanding applications
• Cost-effective reference thermometer solution
• Suitable for industrial quality assurance
• Professional calibration support from europascal

Ideal for Demanding Calibration Applications

The AccuMac AM 1751 is designed for applications requiring a reliable reference thermometer over a wide temperature range.

Secondary reference thermometers are commonly used in calibration laboratories to determine the temperature of a controlled calibration environment.

Typical applications include the calibration of industrial platinum resistance thermometers, temperature probes, digital thermometers and temperature measurement systems.

The AccuMac AM 1751 can be used as a reference thermometer in suitable liquid calibration baths and dry block calibrators.

During a comparison calibration, the reference thermometer and the device under test are placed in a stable temperature environment.

The resistance of the AccuMac AM 1751 is measured using a suitable precision thermometer readout.

The measured resistance is converted into temperature using the appropriate calibration coefficients.

The temperature indicated by the device under test can then be compared with the reference temperature.

This method enables accurate and traceable temperature calibration when the complete measurement system is properly characterized.

Temperature Range from −200 °C to +670 °C

The AccuMac AM 1751 provides an exceptionally wide temperature measurement range.

−200 °C to +670 °C

This range makes the thermometer suitable for low-temperature and high-temperature calibration applications.

Typical calibration temperatures include:

• −196 °C
• −80 °C
• −40 °C
• 0 °C
• 100 °C
• 200 °C
• 300 °C
• 400 °C
• 500 °C
• 600 °C
• 670 °C

The actual usable temperature range depends on the calibration equipment, thermometer readout and measurement procedure.

The wide operating range allows the AccuMac AM 1751 to serve as a versatile reference thermometer for different temperature calibration systems.

This reduces the need for separate reference thermometers covering individual temperature ranges.

Excellent Short-Term Stability

The AccuMac AM 1751 offers excellent short-term temperature stability.

The manufacturer specifies:

< 0.007 °C

This characteristic is particularly important for precision temperature measurements.

A reference thermometer should provide repeatable resistance values under stable temperature conditions.

Short-term stability helps minimize variations during repeated measurements and comparison calibrations.

However, short-term stability must not be confused with absolute temperature accuracy or calibration uncertainty.

The total measurement uncertainty depends on the calibration certificate, resistance measurement instrument, temperature environment and measurement procedure.

For demanding applications, the complete uncertainty budget should be evaluated according to recognized metrological principles.

Secondary Reference Platinum Resistance Thermometer

The AccuMac AM 1751 is classified as a secondary reference platinum resistance thermometer.

Platinum resistance thermometers are widely used in temperature metrology because platinum provides a stable and reproducible relationship between electrical resistance and temperature.

A secondary reference thermometer is typically used as a working reference in calibration laboratories.

It provides a practical balance between measurement performance, durability and cost.

The AccuMac AM 1751 is designed for applications requiring reliable temperature measurements without necessarily using a more delicate primary standard thermometer.

It is suitable for routine comparison calibrations, reference measurements and laboratory temperature monitoring.

ITS-90 Reference Thermometer

The AccuMac AM 1751 meets the relevant criteria of the International Temperature Scale of 1990.

ITS-90

ITS-90 provides an internationally recognized framework for realizing and disseminating temperature measurements.

Platinum resistance thermometers play an important role in this temperature scale.

When a suitable reference thermometer is calibrated at defined temperature points, its resistance-temperature relationship can be characterized using appropriate interpolation equations.

The AccuMac AM 1751 is designed to support traceable temperature measurements based on these principles.

The specific calibration coefficients and applicable temperature intervals should be taken from the individual calibration certificate.

Robust Inconel Protective Sheath

The AccuMac AM 1751 features a protective sheath manufactured from Inconel.

Inconel is a nickel-based alloy known for its mechanical strength and resistance to demanding environmental conditions.

The protective sheath helps protect the sensitive platinum sensing element.

This makes the thermometer suitable for applications requiring repeated insertion into calibration baths or dry block calibrators.

The robust construction is particularly advantageous in laboratories where reference thermometers are used frequently.

Nevertheless, careful handling remains essential.

Mechanical shocks, excessive bending and thermal stress should be avoided to maintain the thermometer’s calibration characteristics.

ISO/IEC 17025 Accredited Calibration Included

The AccuMac AM 1751 is supplied with an ISO/IEC 17025 accredited calibration.

This provides documented metrological traceability for the individual thermometer.

An accredited calibration certificate contains the calibration results and the associated measurement uncertainties.

Depending on the calibration procedure, the certificate may also provide the coefficients required to calculate temperature from measured resistance.

These individual calibration data are essential for high-accuracy temperature measurements.

The calibration uncertainty should always be considered separately from the manufacturer’s short-term stability specification.

Regular recalibration is recommended according to the requirements of the laboratory’s quality management system.

Suitable for Precision Thermometer Readouts

The AccuMac AM 1751 is a resistance thermometer.

It does not contain an integrated temperature display.

To measure temperature, the thermometer must be connected to a suitable precision resistance thermometer readout.

The readout measures the electrical resistance of the platinum sensing element.

The measured resistance is then converted into temperature using the appropriate calibration coefficients.

For accurate measurements, a precision readout with suitable resistance measurement accuracy and resolution should be selected.

A four-wire measurement configuration is generally preferred for precision platinum resistance thermometers because it reduces the influence of lead resistance.

The electrical compatibility of the thermometer and readout must be verified before use.

Comparison Calibration in Liquid Baths

The AccuMac AM 1751 is suitable for comparison calibration in appropriate liquid temperature baths.

Liquid calibration baths provide a controlled temperature environment with good thermal contact between the reference thermometer and the devices under test.

The AccuMac AM 1751 is inserted into the bath together with the temperature sensors being calibrated.

After sufficient stabilization, the reference temperature is determined using the calibrated resistance thermometer.

The temperature indications of the devices under test are compared with this reference value.

For accurate measurements, the bath’s temperature stability and spatial uniformity must be considered.

The immersion depth of the reference thermometer is also important.

Reference Measurements in Dry Block Calibrators

The AccuMac AM 1751 can also be used with suitable dry block temperature calibrators.

Dry block calibrators generate controlled temperatures using a heated or cooled metal block.

The reference thermometer is inserted into a calibration insert together with the device under test.

This enables comparison measurements without requiring calibration liquids.

The AccuMac AM 1751 is particularly useful when an external reference thermometer is needed to determine the actual calibration temperature.

The measurement uncertainty must account for the temperature distribution of the dry block, sensor immersion effects and thermal contact.

Temperature Calibration According to ISO/IEC 17025

The AccuMac AM 1751 is suitable for use in temperature calibration systems operated according to ISO/IEC 17025.

Accredited calibration laboratories require reliable measurement standards and documented metrological traceability.

The reference thermometer forms an important part of the measurement chain.

Its calibration uncertainty contributes to the overall uncertainty of the calibration process.

Other uncertainty contributions may include:

• Precision thermometer readout uncertainty
• Temperature stability
• Temperature uniformity
• Sensor immersion effects
• Thermal contact
• Reference thermometer drift
• Measurement repeatability
• Self-heating effects

A complete uncertainty evaluation helps ensure reliable calibration results.

Technical Highlights

The manufacturer confirms the temperature range, short-term stability, Inconel sheath, ITS-90 suitability and included accredited calibration.

Additional specifications such as nominal resistance, probe diameter, probe length, connector type and individual calibration coefficients should be confirmed for the selected configuration.

Calibration Service by europascal

Regular calibration is essential for maintaining reliable and traceable temperature measurements.

europascal supports customers with professional temperature calibration equipment and calibration services.

The AccuMac AM 1751 can be integrated into a temperature calibration system together with suitable precision thermometer readouts, calibration baths and dry block calibrators.

For demanding temperature calibration applications, the complete measurement uncertainty must be evaluated.

The reference thermometer’s calibration certificate provides important information for establishing metrological traceability.

The recalibration interval should be selected according to the thermometer’s usage, stability history and quality management requirements.

For professional calibration services and technical support, visit the europascal Calibration Service.

Why Choose the AccuMac AM 1751?

The AccuMac AM 1751 combines a wide temperature range, excellent short-term stability and robust mechanical construction.

Its operating range from −200 °C to +670 °C makes it suitable for numerous laboratory and industrial temperature calibration applications.

The specified short-term stability below 0.007 °C supports repeatable reference measurements.

The Inconel protective sheath provides durability for demanding applications.

The included ISO/IEC 17025 accredited calibration supports documented metrological traceability.

The thermometer meets the relevant ITS-90 criteria for reference thermometers and can be used with suitable precision resistance thermometer readouts.

For calibration laboratories and industrial users requiring a reliable secondary reference thermometer, the AccuMac AM 1751 provides a practical combination of measurement performance, flexibility and durability.

europascal supports customers in selecting suitable temperature calibration equipment and establishing reliable calibration processes.

Typical Applications for the AccuMac AM 1751

The AccuMac AM 1751 is suitable for professional temperature measurement and calibration applications.

Typical applications include:

• Reference temperature measurements
• Pt100 calibration
• Pt1000 calibration
• Industrial RTD calibration
• Precision thermometer calibration
• Comparison calibration
• Liquid bath calibration
• Dry block calibration
• Temperature metrology
• Accredited calibration laboratories
• Industrial quality assurance
• Research and development
• Laboratory temperature measurements
• Calibration system verification
• Temperature sensor characterization

The combination of excellent short-term stability, wide temperature range and robust construction makes the AccuMac AM 1751 a reliable secondary reference thermometer for professional temperature metrology.

Find more temperature measurement equipment at europascal.

Manufacturer information for the AccuMac AM 1751 can be found on the official AccuMac website.

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