The Additel AccuMac AM 1760 is a high-precision secondary standard platinum resistance thermometer designed for professional temperature measurement and calibration applications.
With a temperature range from −200 °C to +670 °C, a nominal resistance of 100 Ω and calibrated accuracy down to ±0.006 °C at the triple point of water, the Additel AccuMac AM 1760 provides excellent performance for demanding temperature metrology applications.
The reference thermometer combines outstanding short-term stability with low long-term drift, a robust Inconel sheath and precise four-wire resistance measurement.
It is particularly suitable for calibration laboratories, reference measurements, fixed-point calibrations and comparison calibrations of industrial temperature sensors.
The Additel AccuMac AM 1760 meets the ITS-90 requirements for standard platinum resistance thermometers and is supplied with an ISO/IEC 17025 accredited calibration.
At europascal, customers benefit from professional temperature calibration equipment, technical expertise and comprehensive calibration services.
For traceable calibration of reference thermometers and temperature sensors, visit the europascal Calibration Service.
Your Benefits at a Glance
- High-precision secondary standard platinum resistance thermometer
- Wide temperature range from −200 °C to +670 °C
- Nominal resistance of 100 Ω
- Temperature coefficient of 0.003925 Ω/Ω/°C
- Calibrated accuracy of ±0.006 °C at 0.01 °C
- Excellent short-term stability below 0.002 °C
- Long-term drift below 0.004 °C after 100 hours at 661 °C
- Excellent thermal shock performance
- Four-wire resistance measurement
- Low self-heating of approximately 0.0015 °C at 0.5 mA
- Robust Inconel protective sheath
- Probe diameter of 6.35 mm
- Two probe lengths available
- 305 mm and approximately 500 mm versions
- Suitable for fixed-point and comparison calibrations
- Compatible with precision thermometer readouts
- Meets ITS-90 criteria for reference thermometers
- ISO/IEC 17025 accredited calibration included
Ideal for Demanding Calibration Applications
The Additel AccuMac AM 1760 was developed for applications requiring highly stable and reproducible temperature measurements.
As a secondary standard platinum resistance thermometer, it provides a reliable reference for calibrating industrial temperature sensors and other precision thermometers.
Typical applications include accredited calibration laboratories, industrial calibration departments, research institutions and temperature metrology laboratories.
During comparison calibration, the reference thermometer and device under test are placed in a stable temperature source.
The electrical resistance of the Additel AccuMac AM 1760 is measured using a suitable precision thermometer readout or resistance bridge.
The measured resistance is converted into temperature using the individual calibration coefficients of the reference thermometer.
This procedure allows accurate comparison measurements over a wide temperature range.
The Additel AccuMac AM 1760 can be used with suitable calibration baths, temperature furnaces and fixed-point cells.
For additional equipment, explore the temperature measurement products at europascal.
Temperature Range from −200 °C to +670 °C
The Additel AccuMac AM 1760 covers a temperature range of:
−200 °C to +670 °C
This wide operating range makes the reference thermometer suitable for both low-temperature and high-temperature calibration applications.
At low temperatures, the thermometer can be used for measurements near the boiling point of liquid nitrogen.
At intermediate temperatures, it is suitable for precision measurements in calibration baths.
At higher temperatures, the reference thermometer can be used in suitable calibration furnaces and fixed-point systems.
The wide temperature range allows laboratories to perform numerous calibration tasks using a single reference thermometer.
This reduces the need for multiple reference sensors and simplifies temperature calibration procedures.
High Accuracy of the Additel AccuMac AM 1760
The Additel AccuMac AM 1760 offers excellent calibrated accuracy.
The manufacturer specifies the following values:
| Temperature | Calibrated Accuracy |
|---|---|
| −196 °C | ±0.007 °C |
| 0.01 °C | ±0.006 °C |
| 420 °C | ±0.015 °C |
| 660 °C | ±0.025 °C |
These values demonstrate the outstanding measurement performance of the reference thermometer.
The accuracy of ±0.006 °C at the triple point of water makes the Additel AccuMac AM 1760 particularly suitable for demanding reference measurements.
For complete measurement systems, additional uncertainty contributions must be considered.
These include the thermometer readout, resistance measurement, self-heating, immersion depth and temperature source.
The accuracy of the reference thermometer must therefore not be confused with the expanded measurement uncertainty of the complete calibration setup.
Excellent Short-Term Stability
The Additel AccuMac AM 1760 provides excellent short-term stability.
The manufacturer specifies:
Less than 0.002 °C
This value demonstrates the high reproducibility of the platinum resistance sensing element.
Short-term stability is particularly important during comparison calibrations.
A stable reference thermometer helps minimize changes in the reference indication during a measurement sequence.
This supports reliable calibration results and reduces uncertainty contributions associated with sensor instability.
Low Long-Term Drift
Long-term stability is an essential characteristic of a high-quality reference thermometer.
The Additel AccuMac AM 1760 features a very low drift rate.
The manufacturer specifies:
Less than 0.004 °C after 100 hours at 661 °C
This value refers to the resistance change evaluated at the triple point of water after the specified thermal exposure.
The low drift demonstrates the stability of the sensing element even after prolonged operation at elevated temperatures.
Regular calibration remains necessary to verify the long-term performance of the reference thermometer.
Excellent Thermal Shock Performance
Temperature reference sensors may experience significant thermal stress when moved between different temperature environments.
The Additel AccuMac AM 1760 is designed to minimize changes caused by thermal cycling.
The manufacturer specifies a change of:
Less than 0.002 °C after ten thermal cycles
The test involves cycling between the minimum and maximum specified temperatures.
This characteristic supports reliable operation in laboratories where reference thermometers are regularly used at different temperatures.
Nevertheless, careful handling and controlled temperature changes are recommended to protect the sensing element.
100 Ω Nominal Resistance
The Additel AccuMac AM 1760 features a nominal resistance of:
100 Ω
The manufacturer specifies a temperature coefficient of:
0.003925 Ω/Ω/°C
This characteristic distinguishes the reference thermometer from conventional industrial Pt100 sensors according to IEC 60751.
Industrial Pt100 sensors typically have a temperature coefficient of approximately 0.00385 Ω/Ω/°C.
The Additel AccuMac AM 1760 is designed as a precision reference thermometer rather than a standard industrial RTD.
For accurate measurements, the thermometer must be evaluated using its individual calibration coefficients.
A compatible precision readout or resistance bridge is required.
Low Self-Heating
Resistance thermometers require an electrical measurement current.
This current generates a small amount of heat within the sensing element.
The resulting temperature increase is known as self-heating.
For the Additel AccuMac AM 1760, the manufacturer specifies approximately:
0.0015 °C at a measurement current of 0.5 mA
The low self-heating supports accurate temperature measurements.
For high-precision calibration, self-heating should still be considered in the measurement uncertainty evaluation.
The actual effect depends on the measurement current and the thermal environment surrounding the sensing element.
Four-Wire Resistance Measurement
The Additel AccuMac AM 1760 uses four-wire resistance measurement technology.
Two conductors supply the measurement current, while two additional conductors measure the voltage across the sensing element.
This configuration significantly reduces errors caused by lead resistance.
Four-wire measurement is particularly important for high-precision platinum resistance thermometers.
It allows accurate resistance measurements even when the thermometer is connected using relatively long cables.
The Additel AccuMac AM 1760 is equipped with four Teflon-insulated copper leads.
Robust Inconel Protective Sheath
The Additel AccuMac AM 1760 features a protective sheath made from Inconel.
Inconel is a nickel-based alloy offering excellent temperature resistance and mechanical durability.
The protective sheath helps protect the platinum sensing element from external influences.
The probe diameter is:
6.35 mm
This diameter provides a suitable combination of mechanical strength and thermal performance.
The sensing element is specially designed to reduce contamination effects at elevated temperatures.
Its internal construction also supports good resistance to mechanical and thermal stress.
Two Available Probe Lengths
The Additel AccuMac AM 1760 is available in two probe lengths.
| Model | Probe Length | Diameter |
|---|---|---|
| AM1760-12-SP | 305 mm | 6.35 mm |
| AM1760-20-SP | 500 mm | 6.35 mm |
The shorter version is suitable for many standard calibration baths and temperature sources.
The longer version provides additional flexibility when greater immersion depths are required.
Selecting the correct probe length is important for minimizing heat conduction errors.
For precision temperature measurements, the sensing element must be positioned within the homogeneous region of the temperature source.
Sensor Position and Response Time
The Additel AccuMac AM 1760 features a sensing element approximately:
42 mm long
The sensing element is positioned approximately:
5 mm from the probe tip
The manufacturer specifies a response time of approximately:
9 seconds for 63% response
This value applies under defined conditions in moving water.
The actual response time depends on the temperature source, immersion depth and thermal contact.
For accurate calibration, sufficient time must be allowed for the reference thermometer and device under test to reach thermal equilibrium.
ISO/IEC 17025 Accredited Calibration
The Additel AccuMac AM 1760 is supplied with an ISO/IEC 17025 accredited calibration.
This provides documented metrological traceability for professional temperature measurement applications.
The individual calibration data can be used with a suitable precision thermometer readout.
For laboratories operating according to ISO/IEC 17025, regular monitoring of reference thermometer stability is recommended.
This may include measurements at the triple point of water or other suitable reference temperatures.
The calibration interval should be determined according to the required measurement uncertainty, frequency of use and observed long-term stability.
Technical Highlights
| Specification | Additel AccuMac AM 1760 |
|---|---|
| Manufacturer | Additel |
| Product series | AccuMac |
| Model | AM 1760 |
| Product type | Secondary Standard Platinum Resistance Thermometer |
| Temperature range | −200 °C to +670 °C |
| Nominal resistance | 100 Ω |
| Temperature coefficient | 0.003925 Ω/Ω/°C |
| Accuracy at −196 °C | ±0.007 °C |
| Accuracy at 0.01 °C | ±0.006 °C |
| Accuracy at 420 °C | ±0.015 °C |
| Accuracy at 660 °C | ±0.025 °C |
| Short-term stability | <0.002 °C |
| Long-term drift | <0.004 °C after 100 hours at 661 °C |
| Thermal shock change | <0.002 °C |
| Self-heating | Approx. 0.0015 °C at 0.5 mA |
| Measurement current | 0.5 mA |
| Probe diameter | 6.35 mm |
| Probe lengths | 305 mm or 500 mm |
| Sensing element length | 42 mm |
| Sensor position | 5 mm from tip |
| Sheath material | Inconel |
| Connection | Four-wire |
| Lead length | 2.5 m |
| Insulation resistance | >1000 MΩ at room temperature |
| Response time | Approx. 9 seconds |
| Temperature scale | ITS-90 |
| Calibration | ISO/IEC 17025 accredited |
Additel AccuMac AM 1760 Compared with AM 1762
The Additel AccuMac AM 1760 and AM 1762 belong to the same family of secondary standard platinum resistance thermometers.
Both models cover a temperature range from −200 °C to +670 °C.
They provide excellent accuracy, stability and repeatability.
The main difference is their nominal resistance.
The Additel AccuMac AM 1760 features a nominal resistance of 100 Ω.
The AM 1762 features a nominal resistance of 25 Ω.
The appropriate model should be selected according to the measurement capabilities of the precision thermometer readout or resistance bridge.
For systems optimized for 100 Ω reference thermometers, the Additel AccuMac AM 1760 is an excellent choice.
Why Choose the Additel AccuMac AM 1760?
The Additel AccuMac AM 1760 combines outstanding accuracy, excellent stability and robust construction.
Its wide temperature range allows it to be used for numerous calibration tasks.
The low drift rate supports reliable long-term performance.
The four-wire connection reduces errors caused by lead resistance.
The Inconel sheath provides mechanical protection and excellent temperature resistance.
Two available probe lengths allow the thermometer to be adapted to different calibration systems.
The included accredited calibration provides the traceability required for professional metrology applications.
For laboratories requiring a reliable secondary standard thermometer, the Additel AccuMac AM 1760 offers an excellent combination of precision, flexibility and durability.
Typical Applications for the Additel AccuMac AM 1760
The Additel AccuMac AM 1760 is suitable for a wide range of professional temperature measurement applications.
Typical applications include:
- Calibration of industrial Pt100 sensors
- Calibration of precision resistance thermometers
- Reference temperature measurements
- Temperature comparison calibrations
- Fixed-point measurements
- Triple point of water measurements
- Calibration baths
- Temperature calibration furnaces
- Precision temperature measurements
- Temperature source characterization
- Research and development
- Accredited calibration laboratories
- Industrial calibration laboratories
- Temperature metrology
- Quality assurance
- Reference standard monitoring
During comparison calibration, the reference thermometer and device under test are placed in a stable and homogeneous temperature environment.
The resistance of the reference thermometer is measured using a suitable precision readout.
The individual calibration coefficients are then used to determine the reference temperature.
europascal supports customers with suitable reference thermometers, precision temperature readouts, calibration baths and temperature calibration equipment.
For professional calibration and metrological traceability, visit the europascal Calibration Service.
Find more Additel products here.
Manufacturer information for the Additel AccuMac AM 1760 can be found on the official Additel website.
