The Additel AccuMac AM 1762 is a high-precision secondary standard platinum resistance thermometer (SPRT) designed for demanding temperature measurements and professional temperature calibration applications.
With a temperature range from −200 °C to +670 °C, a nominal resistance of 25 Ω at the triple point of water and a calibrated accuracy of ±0.006 °C at 0.01 °C, the Additel AccuMac AM 1762 provides excellent measurement performance for calibration laboratories, research institutions and industrial temperature metrology.
The thermometer combines outstanding short-term stability, low long-term drift and a robust Inconel sheath. Its specially designed platinum sensing element provides reliable performance even during repeated temperature cycles.
The Additel AccuMac AM 1762 meets the relevant ITS-90 requirements for standard platinum resistance thermometers and is supplied with an ISO/IEC 17025 accredited calibration.
Two probe lengths are available, allowing users to select the appropriate configuration for their calibration equipment.
At europascal, customers benefit from professional advice on reference thermometers, temperature calibration systems and metrological traceability.
For additional information about professional calibration services, visit the europascal Calibration Service.
Your Benefits at a Glance
The Additel AccuMac AM 1762 offers excellent performance for precision temperature measurement.
Its most important advantages include:
- Temperature range from −200 °C to +670 °C
- Secondary standard platinum resistance thermometer
- Nominal resistance of 25 Ω at 0.01 °C
- Calibrated accuracy of ±0.006 °C at 0.01 °C
- Short-term stability better than 0.002 °C
- Long-term drift below 0.004 °C after 100 hours at 661 °C
- Temperature coefficient of 0.003925 Ω/Ω/°C
- Compliance with ITS-90 requirements for reference thermometers
- High-quality platinum sensing element
- Robust Inconel protective sheath
- Four-wire resistance measurement
- Recommended measurement current of 1 mA
- Low self-heating effect
- Fast response time of approximately 9 seconds
- Excellent thermal shock performance
- Probe diameter of 6.35 mm
- Available lengths of 305 mm and 508 mm
- ISO/IEC 17025 accredited calibration included
- Suitable for calibration laboratories and industrial applications
The combination of excellent stability, low drift and high temperature accuracy makes the Additel AccuMac AM 1762 a reliable reference thermometer for demanding calibration applications.
Temperature Range from −200 °C to +670 °C
The Additel AccuMac AM 1762 covers a wide temperature range:
−200 °C to +670 °C
This makes the thermometer suitable for both cryogenic and high-temperature calibration applications.
Typical measurement temperatures include:
- −196 °C
- −100 °C
- 0.01 °C
- +100 °C
- +200 °C
- +420 °C
- +661 °C
The wide operating range allows the thermometer to be used in different temperature calibration systems.
These include liquid calibration baths, precision temperature furnaces and suitable dry block calibrators.
The actual usable temperature range depends on the calibration setup, immersion depth and environmental conditions.
The temperature range of the probe must also be distinguished from the calibrated temperature range stated on its individual calibration certificate.
Excellent Calibrated Accuracy
The Additel AccuMac AM 1762 provides excellent calibrated accuracy across its temperature range.
The manufacturer specifies the following values:
| Temperature | Calibrated Accuracy |
|---|---|
| −196 °C | ±0.010 °C |
| +0.01 °C | ±0.006 °C |
| +420 °C | ±0.015 °C |
| +661 °C | ±0.025 °C |
The values are specified with a coverage factor of k = 2 and include the calibration contribution and the manufacturer’s defined drift allowance.
These specifications demonstrate the thermometer’s suitability for precision temperature calibration.
For demanding applications, the complete measurement uncertainty must be evaluated.
The uncertainty of the thermometer readout, temperature source and calibration procedure must also be considered.
Excellent Short-Term Stability
The Additel AccuMac AM 1762 provides outstanding short-term stability.
The manufacturer specifies:
< 0.002 °C
This corresponds to less than 2 mK.
Excellent short-term stability is particularly important for comparison calibration.
During a calibration procedure, the reference thermometer must provide reliable and repeatable measurements.
A stable reference thermometer helps minimize measurement variations and supports accurate calibration results.
Low Long-Term Drift
Long-term stability is an essential characteristic of a high-quality reference thermometer.
The Additel AccuMac AM 1762 provides excellent long-term performance.
The manufacturer specifies:
< 0.004 °C after 100 hours at 661 °C
This drift is evaluated at the triple point of water.
The value demonstrates the thermometer’s ability to maintain stable measurement characteristics even after prolonged exposure to high temperatures.
Actual drift depends on handling, operating conditions and maintenance.
Regular verification at a suitable reference temperature is recommended for demanding metrological applications.
Nominal Resistance of 25 Ω
The Additel AccuMac AM 1762 features a nominal resistance of:
25 Ω at 0.01 °C
This distinguishes it from the Additel AccuMac AM 1760, which has a nominal resistance of 100 Ω.
The AM 1762 is designed for precision resistance measurement using a suitable thermometer readout or resistance bridge.
The thermometer has a temperature coefficient of:
0.003925 Ω/Ω/°C
This characteristic is typical of high-purity platinum reference thermometers.
It differs from the nominal coefficient of industrial Pt100 sensors according to IEC 60751.
For accurate temperature calculation, the individual calibration coefficients supplied with the thermometer should be used.
ITS-90 Reference Thermometer
The Additel AccuMac AM 1762 meets the relevant requirements of the International Temperature Scale of 1990 (ITS-90) for standard platinum resistance thermometers.
ITS-90 provides an internationally recognized basis for accurate temperature measurement.
The thermometer can be used as a secondary standard in suitable calibration systems.
Individual calibration coefficients allow the relationship between resistance and temperature to be determined accurately.
For high-precision applications, these coefficients are entered into a compatible reference thermometer readout or measurement system.
This allows the specific characteristics of the individual thermometer to be considered.
Robust Inconel Protective Sheath
The Additel AccuMac AM 1762 features a high-quality Inconel sheath.
Inconel is a nickel-based alloy known for its resistance to elevated temperatures and demanding environmental conditions.
The protective sheath helps protect the platinum sensing element against mechanical influences and contamination.
This is particularly important for reference thermometers that are used repeatedly in calibration laboratories.
The robust construction supports reliable performance during daily operation.
Nevertheless, the thermometer should be handled carefully to avoid mechanical shock, excessive bending and contamination.
Specially Designed Platinum Sensing Element
The Additel AccuMac AM 1762 uses a specially designed platinum sensing element.
The construction protects the platinum wire against contamination at high temperatures.
A dedicated internal support structure helps balance mechanical stability, thermal shock resistance and measurement performance.
The manufacturer specifies a thermal shock effect of:
< 0.002 °C after 10 temperature cycles
These cycles cover the specified minimum and maximum operating temperatures.
The design helps maintain reliable measurement characteristics during repeated temperature changes.
Low Self-Heating Effect
Resistance thermometers require an electrical measurement current.
This current produces a small amount of heat within the sensing element.
The resulting temperature increase is known as self-heating.
For the Additel AccuMac AM 1762, the manufacturer specifies:
0.0015 °C at 1 mA
This corresponds to approximately 1.5 mK.
The specified measurement current is:
1 mA
For high-accuracy applications, the influence of self-heating should be evaluated under the actual measurement conditions.
The self-heating effect depends on the measurement current and the thermal environment surrounding the sensor.
Fast Response Time
The Additel AccuMac AM 1762 provides a response time of approximately:
9 seconds
This value refers to a 63% response to a temperature step in moving water under the manufacturer’s specified conditions.
The actual response time depends on the temperature medium, flow conditions and installation.
Fast response is beneficial when measuring temperature changes or performing multi-point calibrations.
However, sufficient stabilization time must always be allowed before recording precision calibration measurements.
Available Probe Lengths
The Additel AccuMac AM 1762 is available in two standard lengths.
| Model | Probe Length | Probe Diameter |
|---|---|---|
| AM1762-12 | 305 mm | 6.35 mm |
| AM1762-20 | 508 mm | 6.35 mm |
Both configurations use the same nominal resistance and temperature measurement principle.
The appropriate length depends on the required immersion depth and the calibration equipment.
The longer version is particularly suitable for deeper calibration baths and furnaces.
The shorter version can be advantageous when working with compact calibration systems.
Four-Wire Resistance Measurement
The Additel AccuMac AM 1762 uses a four-wire electrical connection.
Four-wire resistance measurement minimizes errors caused by lead resistance.
Two conductors supply the measurement current, while the other two conductors measure the voltage across the sensing element.
This measurement principle is essential for high-accuracy platinum resistance thermometry.
The thermometer can be connected to compatible precision resistance bridges and reference thermometer readouts.
Suitable connection options should be selected according to the measurement instrument.
Compatibility with Reference Thermometer Readouts
The Additel AccuMac AM 1762 can be used with suitable high-precision thermometer readouts.
For example, the Additel ADT 286 Multifunction Reference Thermometer Readout supports precision resistance measurements and ITS-90 sensor characteristics.
A compatible readout measures the resistance of the AM 1762 and calculates the corresponding temperature using its individual calibration coefficients.
The complete measurement system consists of the reference thermometer, readout and temperature source.
For high-accuracy applications, the uncertainty contributions of all components must be considered.
Technical Highlights
| Specification | Additel AccuMac AM 1762 |
|---|---|
| Manufacturer | Additel |
| Product series | AccuMac |
| Model | AM 1762 |
| Product type | Secondary Standard Platinum Resistance Thermometer |
| Temperature range | −200 °C to +670 °C |
| Nominal resistance at 0.01 °C | 25 Ω |
| Temperature coefficient | 0.003925 Ω/Ω/°C |
| Accuracy at −196 °C | ±0.010 °C |
| Accuracy at 0.01 °C | ±0.006 °C |
| Accuracy at 420 °C | ±0.015 °C |
| Accuracy at 661 °C | ±0.025 °C |
| Coverage factor for accuracy | k = 2 |
| Short-term stability | < 0.002 °C |
| Long-term drift | < 0.004 °C after 100 h at 661 °C |
| Thermal shock effect | < 0.002 °C |
| Self-heating at 1 mA | 0.0015 °C |
| Measurement current | 1 mA |
| Response time | Approx. 9 seconds |
| Sensor length | 42 mm |
| Sensor position | 5 mm from probe tip |
| Insulation resistance | > 1000 MΩ at room temperature |
| Sheath material | Inconel |
| Probe diameter | 6.35 mm |
| Available probe lengths | 305 mm and 508 mm |
| Electrical connection | Four-wire |
| Handle diameter | 15 mm |
| Handle length | 65 mm |
| Handle temperature range | −50 °C to +180 °C |
| Calibration | ISO/IEC 17025 accredited calibration included |
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.
The Additel AccuMac AM 1762 can be integrated into a high-precision temperature calibration system using a suitable thermometer readout and temperature source.
For demanding applications, the complete measurement uncertainty should be evaluated according to ISO/IEC 17025 and applicable metrological guidelines.
Relevant uncertainty contributions include the calibration uncertainty of the reference thermometer, long-term drift, self-heating, readout accuracy, temperature stability and immersion effects.
The individual uncertainty contributions must be evaluated carefully to avoid double-counting effects already included in the manufacturer’s specifications.
europascal supports customers with professional temperature calibration equipment, technical advice and calibration services.
For additional information, visit the europascal Calibration Service.
Why Choose the Additel AccuMac AM 1762?
The Additel AccuMac AM 1762 combines excellent temperature accuracy with outstanding stability and a robust mechanical design.
Its wide temperature range from −200 °C to +670 °C makes it suitable for demanding calibration applications.
The nominal resistance of 25 Ω and the temperature coefficient of 0.003925 Ω/Ω/°C make it particularly suitable for precision resistance thermometry.
With calibrated accuracy of ±0.006 °C at the triple point of water and short-term stability better than 0.002 °C, the thermometer provides excellent measurement performance.
The low long-term drift helps maintain reliable reference measurements during repeated use.
The Inconel sheath protects the platinum sensing element and supports operation at elevated temperatures.
Two available probe lengths provide flexibility for different calibration systems.
The included ISO/IEC 17025 accredited calibration provides documented metrological traceability.
For calibration laboratories, research institutions and industrial users requiring a reliable secondary standard platinum resistance thermometer, the Additel AccuMac AM 1762 is an excellent choice.
Typical Calibration Applications
The Additel AccuMac AM 1762 is suitable for numerous precision temperature measurement applications.
Typical applications include:
- Calibration of industrial Pt100 sensors
- Calibration of platinum resistance thermometers
- Comparison calibration of temperature sensors
- Temperature measurements in liquid calibration baths
- Temperature measurements in precision calibration furnaces
- Verification of dry block calibrators
- Temperature stability measurements
- Temperature uniformity investigations
- Laboratory reference temperature measurements
- Industrial temperature metrology
- Research and development
- Quality assurance
- Calibration laboratories
- ITS-90 temperature measurements
- High-precision resistance thermometry
The combination of excellent accuracy, outstanding stability and robust construction makes the Additel AccuMac AM 1762 a professional reference thermometer for demanding temperature calibration applications.
Find more Additel products here.
Manufacturer information for the Additel AccuMac AM 1762 can be found on the official Additel website.
