The Additel AccuMac AM 1640 is a high-precision industrial platinum resistance thermometer designed for accurate temperature measurements and professional calibration applications.
With a temperature range from −200 °C to +420 °C, an accuracy better than 0.035 °C at 0 °C and excellent short-term stability better than 0.01 °C, the Additel AccuMac AM 1640 provides reliable performance for demanding temperature measurement applications.
The instrument features a specially designed wire-wound platinum sensing element, a robust Inconel sheath and a four-wire connection for accurate resistance measurements.
Its excellent mechanical stability, low hysteresis and resistance to thermal shock make it particularly suitable for calibration laboratories, industrial temperature measurement and demanding field applications.
Each Additel AccuMac AM 1640 is supplied with an ISO/IEC 17025 accredited calibration.
At europascal, customers receive professional advice on temperature measurement equipment, reference thermometers and calibration solutions.
Your Benefits at a Glance
- Temperature range from −200 °C to +420 °C
- Accuracy better than 0.035 °C at 0 °C
- Short-term stability better than 0.01 °C
- Long-term drift below 0.03 °C under specified conditions
- Thermal shock effect below 0.007 °C
- Hysteresis of 0.01 °C or less
- Nominal resistance of 100 Ω at 0 °C
- Temperature coefficient of 0.00385 Ω/Ω/°C
- High-quality wire-wound platinum sensing element
- Robust Inconel protective sheath
- Four-wire measurement connection
- Suitable for measurement currents of 0.5 mA and 1 mA
- Fast response time of approximately 5 seconds
- Excellent resistance to mechanical shock
- Two probe lengths available
- Suitable for dry block calibrators
- Suitable for liquid calibration baths
- Suitable for industrial temperature measurements
- ISO/IEC 17025 accredited calibration included
- Professional calibration support from europascal
Ideal for Demanding Calibration Applications
The Additel AccuMac AM 1640 was developed for applications requiring precise and reproducible temperature measurements.
It is particularly suitable for use as a reference thermometer in temperature calibration systems.
A typical calibration setup consists of a stable temperature source, a calibrated reference thermometer and a device under test.
The AM 1640 is inserted into a suitable dry block calibrator or liquid calibration bath together with the temperature sensor being calibrated.
A compatible precision thermometer readout measures the resistance of the AM 1640 and calculates the corresponding reference temperature.
The indication of the device under test can then be compared with this reference temperature.
This method allows accurate comparison calibrations of industrial temperature sensors.
The AM 1640 is also suitable for temperature measurements in industrial processes where excellent stability and reproducibility are required.
Wide Temperature Range from −200 °C to +420 °C
The Additel AccuMac AM 1640 provides a wide temperature measurement range:
−200 °C to +420 °C
This makes the reference thermometer suitable for both low-temperature and elevated-temperature applications.
Typical measurement and calibration temperatures include:
- −196 °C
- −100 °C
- −80 °C
- −40 °C
- 0 °C
- +50 °C
- +100 °C
- +200 °C
- +300 °C
- +420 °C
The wide temperature range allows the AM 1640 to be used in various calibration systems.
Typical temperature sources include liquid baths, dry block calibrators and other suitable temperature-controlled environments.
The maximum operating temperature of the AM 1640 is +420 °C.
For applications requiring temperatures up to +670 °C, Additel offers the AccuMac AM 1660.
High Accuracy Better Than 0.035 °C
The Additel AccuMac AM 1640 provides excellent temperature measurement accuracy.
The manufacturer specifies:
Accuracy: <0.035 °C at 0 °C
This specification describes the performance of the platinum resistance thermometer under the manufacturer’s defined conditions.
It is important to distinguish between sensor accuracy, calibration uncertainty and the accuracy of the complete measurement system.
The overall measurement uncertainty also depends on the connected thermometer readout, the calibration coefficients and the measurement conditions.
For high-accuracy applications, the AM 1640 should be used with a suitable precision resistance thermometer readout.
Excellent Short-Term Stability
The Additel AccuMac AM 1640 features excellent short-term stability.
The manufacturer specifies:
Short-term stability: <0.01 °C
High short-term stability is essential for reliable comparison calibrations.
During a calibration procedure, the reference thermometer should provide consistent readings under stable temperature conditions.
Low short-term variations help reduce the uncertainty contribution associated with the reference sensor.
This makes the AM 1640 suitable for professional temperature calibration laboratories and industrial calibration applications.
Low Long-Term Drift
The Additel AccuMac AM 1640 is designed for excellent long-term stability.
The manufacturer specifies a long-term drift of:
<0.03 °C at 0 °C after 100 hours at the maximum operating temperature
This specification demonstrates the stability of the sensor after prolonged exposure to elevated temperatures.
Long-term stability is particularly important for reference thermometers used regularly in calibration laboratories.
A stable reference thermometer helps maintain consistent measurement results between calibration intervals.
Nevertheless, regular recalibration is necessary to verify the continued performance of the sensor.
Low Temperature Hysteresis
The Additel AccuMac AM 1640 features low temperature hysteresis.
The manufacturer specifies:
Hysteresis: ≤0.01 °C
Temperature hysteresis describes the difference in thermometer indication at the same temperature after different thermal histories.
For example, a reference thermometer may show slightly different resistance values at 0 °C depending on whether it was previously exposed to high or low temperatures.
Low hysteresis improves measurement reproducibility.
This is particularly important for calibration procedures covering a wide temperature range.
Excellent Thermal Shock Resistance
The Additel AccuMac AM 1640 is designed to withstand demanding temperature changes.
The manufacturer specifies a thermal shock effect of:
<0.007 °C after ten temperature cycles between the minimum and maximum operating temperatures
This characteristic is particularly important for portable calibration applications.
Temperature sensors used in dry block calibrators may experience frequent changes between different calibration temperatures.
The robust construction of the AM 1640 helps minimize changes in sensor characteristics caused by thermal cycling.
High-Quality Platinum Sensing Element
The Additel AccuMac AM 1640 uses a specially designed wire-wound platinum sensing element.
The sensing element is designed to provide excellent stability and repeatability.
Special construction techniques help protect the platinum wire against contamination at elevated temperatures.
A supporting structure and suitable filling material provide mechanical stability while minimizing unwanted stresses on the sensing element.
This design helps reduce hysteresis and improves resistance to mechanical and thermal shock.
The result is a robust precision thermometer suitable for demanding industrial and laboratory applications.
Standard Pt100 Characteristic
The Additel AccuMac AM 1640 has a nominal resistance of:
100 Ω at 0 °C
The temperature coefficient is:
0.00385 Ω/Ω/°C
This corresponds to the commonly used industrial Pt100 characteristic.
The sensor can therefore be evaluated using a suitable thermometer readout that supports the 385 platinum resistance characteristic.
For accurate reference measurements, the individual calibration data of the sensor should be considered.
A nominal Pt100 characteristic alone does not represent the complete individual calibration of the thermometer.
Four-Wire Resistance Measurement
The Additel AccuMac AM 1640 uses a four-wire electrical connection.
Four-wire measurement is particularly important for precision resistance thermometers.
In a two-wire measurement, the resistance of the connecting cables contributes directly to the measured resistance.
This can introduce significant temperature measurement errors.
A four-wire measurement separates the current-carrying connections from the voltage measurement connections.
This minimizes the influence of lead resistance.
The AM 1640 is supplied with four Teflon-insulated copper leads.
The standard cable length is approximately:
2 meters
The thermometer can be connected to compatible precision resistance measurement instruments.
Measurement Current
The Additel AccuMac AM 1640 supports measurement currents of:
0.5 mA or 1 mA
The measurement current is supplied by the connected thermometer readout.
An appropriate measurement current must be selected to achieve a suitable balance between measurement resolution and sensor self-heating.
Excessive measurement current can cause the sensing element to warm above the temperature of the surrounding medium.
This effect must be considered when evaluating measurement uncertainty.
For demanding calibration applications, the influence of self-heating should be investigated or included in the uncertainty budget.
Fast Response Time
The Additel AccuMac AM 1640 provides a fast response to temperature changes.
The manufacturer specifies:
Response time: approximately 5 seconds
This value refers to a 63% response to a temperature step in water moving at approximately 1 m/s.
The actual response time depends on the measurement environment.
In dry block calibrators, response times may be longer because of different thermal contact conditions.
The response time of the complete measurement system must be considered before recording calibration results.
Robust Inconel Sheath
The Additel AccuMac AM 1640 features a protective sheath made from Inconel.
Inconel is a nickel-based alloy known for its mechanical strength and resistance to demanding temperature conditions.
The sheath protects the platinum sensing element against mechanical damage.
This makes the thermometer suitable for repeated insertion into calibration baths and dry block calibrators.
The robust construction also supports use in industrial measurement environments.
The suitability of the sheath for a particular chemical medium should be checked separately.
Two Available Probe Versions
The Additel AccuMac AM 1640 is available in two different probe dimensions.
Additel AccuMac AM 1640-12
The AM 1640-12 features:
- Probe length: 305 mm
- Probe diameter: 6.35 mm
- Temperature range: −200 °C to +420 °C
This version is suitable for applications requiring a longer immersion depth.
Additel AccuMac AM 1640-9
The AM 1640-9 features:
- Probe length: 228.6 mm
- Probe diameter: 4.775 mm
- Temperature range: −200 °C to +420 °C
This version is particularly suitable for calibration applications requiring a smaller probe diameter.
Both versions use the same nominal Pt100 characteristic and are supplied with an accredited calibration.
Sensor Position and Immersion Depth
The AM 1640 uses a sensing element approximately:
32 mm long
The sensing element begins approximately:
5 mm from the probe tip
This information is important when selecting the immersion depth.
For accurate temperature calibration, the entire sensing element must be exposed to a sufficiently uniform temperature.
Insufficient immersion can cause measurement errors due to heat conduction along the probe.
The required immersion depth depends on the temperature difference between the measurement zone and the surrounding environment.
It also depends on the thermal conductivity of the sheath and the required measurement uncertainty.
ISO/IEC 17025 Accredited Calibration Included
Each Additel AccuMac AM 1640 is supplied with an ISO/IEC 17025 accredited calibration.
This provides documented metrological traceability.
The calibration certificate contains information about the measured performance of the individual thermometer.
The individual calibration results can be used to improve the accuracy of temperature measurements.
For demanding applications, the calibration uncertainty and the uncertainty of the connected readout must be considered.
Regular recalibration is recommended according to the operating conditions and the quality requirements of the user.
Technical Highlights
| Specification | Additel AccuMac AM 1640 |
|---|---|
| Manufacturer | Additel |
| Product series | AccuMac |
| Model | AM 1640 |
| Product type | Precision Industrial Platinum Resistance Thermometer |
| Temperature range | −200 °C to +420 °C |
| Nominal resistance at 0 °C | 100 Ω |
| Temperature coefficient | 0.00385 Ω/Ω/°C |
| Accuracy at 0 °C | <0.035 °C |
| Short-term stability | <0.01 °C |
| Long-term drift | <0.03 °C under specified conditions |
| Thermal shock effect | <0.007 °C |
| Hysteresis | ≤0.01 °C |
| Measurement current | 0.5 mA or 1 mA |
| Self-heating specification | 50 mW/°C |
| Response time | 5 seconds under specified conditions |
| Sensor element length | 32 mm |
| Sensor position | 5 mm from probe tip |
| Insulation resistance | >1000 MΩ at room temperature |
| Sheath material | Inconel |
| AM 1640-12 probe diameter | 6.35 mm |
| AM 1640-12 probe length | 305 mm |
| AM 1640-9 probe diameter | 4.775 mm |
| AM 1640-9 probe length | 228.6 mm |
| Electrical connection | Four-wire |
| Cable length | 2 meters |
| Cable insulation | Teflon |
| Handle temperature range | −50 °C to +180 °C |
| Calibration | ISO/IEC 17025 accredited calibration included |
Compatible Temperature Measurement Equipment
The Additel AccuMac AM 1640 can be used with compatible precision thermometer readouts.
A suitable readout must support four-wire resistance measurement and the relevant Pt100 characteristic.
For accurate reference measurements, the instrument should also support the use of individual calibration coefficients or appropriate resistance-to-temperature conversion.
The AM 1640 can be combined with suitable temperature calibration baths and dry block calibrators.
This allows users to create complete temperature calibration systems for laboratory and field applications.
europascal supports customers in selecting suitable reference thermometers, readouts and temperature sources.
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 calibration equipment.
When the Additel AccuMac AM 1640 is used as a reference thermometer, the measurement uncertainty must be evaluated according to the complete measurement procedure.
Relevant uncertainty contributions may include:
- Calibration uncertainty of the reference thermometer
- Resistance measurement uncertainty of the readout
- Sensor stability
- Sensor drift
- Self-heating
- Temperature hysteresis
- Immersion depth
- Heat conduction along the probe
- Temperature stability of the calibration source
- Temperature distribution within the calibration source
- Measurement repeatability
The individual contributions should be evaluated according to the applicable calibration procedure.
For professional calibration services and metrological traceability, visit the europascal Calibration Service.
Why Choose the Additel AccuMac AM 1640?
The Additel AccuMac AM 1640 combines excellent measurement accuracy with robust industrial construction.
Its temperature range from −200 °C to +420 °C covers numerous professional temperature measurement and calibration applications.
Accuracy better than 0.035 °C at 0 °C and short-term stability better than 0.01 °C provide reliable conditions for demanding reference measurements.
The specially designed wire-wound platinum sensing element offers excellent repeatability and resistance to mechanical and thermal shock.
The robust Inconel sheath protects the sensor during repeated use.
Four-wire resistance measurement minimizes errors caused by connecting cable resistance.
Two available probe dimensions allow the thermometer to be adapted to different calibration setups.
The included ISO/IEC 17025 accredited calibration provides documented metrological traceability.
For calibration laboratories, industrial users and service technicians requiring a reliable precision resistance thermometer, the Additel AccuMac AM 1640 provides an excellent combination of accuracy, stability and durability.
Typical Applications for the Additel AccuMac AM 1640
The Additel AccuMac AM 1640 is suitable for numerous professional temperature measurement and calibration applications.
Typical applications include:
- Reference temperature measurement
- Pt100 calibration
- RTD calibration
- Temperature sensor comparison calibration
- Calibration of industrial thermometers
- Dry block calibrator applications
- Liquid calibration bath measurements
- Temperature stability measurements
- Temperature uniformity measurements
- Calibration laboratories
- Industrial quality assurance
- Process temperature measurement
- Research and development
- Laboratory temperature metrology
- Field calibration
- Preventive maintenance
The combination of high accuracy, excellent stability, robust construction and accredited calibration makes the Additel AccuMac AM 1640 a professional solution for demanding temperature measurement applications.
Find more Additel products at europascal.
Manufacturer information for the Additel AccuMac AM 1640 can be found on the official Additel website.
