The Additel AccuMac AM 1612A is a high-precision platinum resistance thermometer designed for accurate temperature measurement and calibration in demanding industrial and laboratory environments.

With a temperature range from −200 °C to +160 °C, excellent short-term stability of less than 0.02 °C and a compact stainless steel sensing probe, the Additel AccuMac AM 1612A provides reliable performance for professional temperature measurement applications.

One of its most important features is its full immersion capability. Unlike conventional platinum resistance thermometers, the Additel AccuMac AM 1612A is designed to allow the sensing probe, transition junction and connecting leads to be exposed to temperatures throughout the specified operating range.

This makes the thermometer particularly suitable for temperature measurements in environmental chambers, climate chambers, freezers, sterilizers and liquid calibration baths.

The sealed construction helps prevent moisture ingress and allows the sensor to operate in humid environments and compatible heat transfer fluids.

Every Additel AccuMac AM 1612A is supplied with an ISO/IEC 17025 accredited calibration, providing documented metrological traceability.

At europascal, customers benefit from professional temperature measurement solutions, technical advice and calibration services.

For further information about temperature calibration, visit the europascal Calibration Service.

Your Benefits at a Glance

The Additel AccuMac AM 1612A combines precision temperature measurement with a compact and durable design.

Its main advantages include:

• Platinum resistance thermometer with full immersion capability
• Temperature range from −200 °C to +160 °C
• Accuracy of ±0.05 °C at specified calibration points
• Accuracy of ±0.072 °C at −200 °C
• Short-term stability better than 0.02 °C
• Hysteresis of 0.01 °C or less
• Excellent resistance to thermal shock
• Nominal resistance of 100 Ω at 0 °C
• Temperature coefficient of 0.00385 Ω/Ω/°C
• Four-wire resistance measurement
• Compact stainless steel probe
• Probe diameter of only 3 mm
• Probe length of 50 mm
• Sensor element length of 30 mm
• Fast response time of approximately 4 seconds
• Suitable for humid environments
• Moisture-resistant sealed construction
• Suitable for compatible heat transfer fluids
• Transition junction and leads designed for full-range exposure
• Ideal for environmental chambers and freezers
• Suitable for temperature validation and calibration
• ISO/IEC 17025 accredited calibration included
• Compatible with suitable Additel temperature measurement instruments
• Different connector configurations available

Ideal for Demanding Temperature Calibration Applications

The Additel AccuMac AM 1612A is specifically designed for applications where conventional reference thermometers may be difficult to use.

In many temperature calibration procedures, the temperature sensor must be inserted into a chamber, freezer or liquid bath.

Conventional resistance thermometers often have limitations concerning the maximum permissible temperature at the transition junction or connecting cable.

These limitations can make it difficult to position the sensing element correctly.

The Additel AccuMac AM 1612A addresses this challenge with a special construction that allows the complete sensor assembly, including the transition junction and connecting leads, to withstand the specified temperature range.

This provides greater flexibility when measuring temperatures in confined spaces or environments with challenging installation conditions.

The thermometer is particularly suitable for laboratories, industrial quality assurance and temperature validation applications.

Temperature Range from −200 °C to +160 °C

The specified operating temperature range of the Additel AccuMac AM 1612A is:

−200 °C to +160 °C

This wide temperature range allows the thermometer to be used in both low-temperature and elevated-temperature applications.

Typical measurement temperatures include:

• −196 °C
• −100 °C
• −80 °C
• −40 °C
• 0 °C
• +25 °C
• +50 °C
• +100 °C
• +160 °C

The lower temperature range makes the thermometer particularly useful for freezers, cryogenic applications and low-temperature calibration systems.

The upper temperature limit of +160 °C also allows applications in heated environmental chambers, liquid baths and suitable sterilization processes.

The temperature limits of the connected measuring instrument and any additional accessories must be considered separately.

High Measurement Accuracy

The Additel AccuMac AM 1612A provides excellent temperature measurement accuracy.

According to the manufacturer, the specified accuracy depends on temperature.

These specifications demonstrate the thermometer’s suitability for demanding temperature measurement applications.

For professional calibration work, the individual calibration certificate and its associated measurement uncertainty must also be considered.

The manufacturer’s accuracy specification should not be confused with the expanded calibration uncertainty.

Excellent Short-Term Stability

The Additel AccuMac AM 1612A offers excellent short-term temperature stability.

The manufacturer specifies:

< 0.02 °C

Short-term stability describes the change in the thermometer’s measurement characteristics over a relatively short period.

Good short-term stability is particularly important when performing comparison calibrations.

During these measurements, the reference thermometer and device under test are exposed to the same temperature conditions.

A stable reference thermometer helps minimize uncertainty contributions caused by changes in its resistance-temperature relationship.

Low Hysteresis

The Additel AccuMac AM 1612A is designed to minimize hysteresis effects.

The manufacturer specifies:

≤ 0.01 °C

Temperature hysteresis describes the difference in thermometer indication at the same temperature depending on the previous thermal history.

For example, a resistance thermometer may indicate slightly different temperatures after approaching a measurement point from a higher or lower temperature.

Low hysteresis is therefore particularly important for accurate temperature calibration.

The AM 1612A provides excellent conditions for repeated measurements involving heating and cooling cycles.

Excellent Thermal Shock Performance

Temperature sensors used in calibration laboratories are frequently exposed to rapid temperature changes.

These changes can cause mechanical stress and influence the resistance characteristics of the sensing element.

The Additel AccuMac AM 1612A is designed to withstand demanding thermal cycling.

The manufacturer specifies a thermal shock effect of:

< 0.02 °C after 10 temperature cycles

These cycles extend between the minimum and maximum specified operating temperatures.

This performance makes the thermometer suitable for applications requiring repeated temperature changes.

Full Immersion Capability

One of the most important features of the Additel AccuMac AM 1612A is its full immersion design.

Conventional platinum resistance thermometers often have a transition junction that must remain outside the calibration medium.

This can limit their use in compact chambers or deep immersion applications.

The Additel AccuMac AM 1612A is designed so that the transition junction and connecting leads can withstand temperatures throughout the thermometer’s operating range.

This makes the instrument especially useful for temperature measurement in environmental chambers, freezers and compatible liquid calibration baths.

The sealed construction helps protect the thermometer against moisture ingress.

Full immersion capability does not eliminate the need to observe the chemical compatibility of the sensor materials and the manufacturer’s operating instructions.

Compact Stainless Steel Probe

The Additel AccuMac AM 1612A features a compact stainless steel sensing probe.

The manufacturer specifies the following dimensions:

Probe diameter: 3 mm

Probe length: 50 mm

The compact design allows the thermometer to be used in applications where installation space is limited.

The stainless steel sheath provides mechanical protection for the sensitive platinum resistance element.

The small diameter also supports rapid thermal response.

This makes the thermometer particularly suitable for temperature measurements in compact calibration systems and environmental chambers.

Platinum Resistance Sensor

The Additel AccuMac AM 1612A uses a platinum resistance temperature sensor.

The nominal resistance is:

100 Ω at 0 °C

The temperature coefficient is:

0.00385 Ω/Ω/°C

This corresponds to the commonly used industrial Pt100 characteristic.

Platinum resistance thermometers are widely used in temperature metrology because of their reproducibility, stability and predictable resistance-temperature relationship.

The resistance changes with temperature and can be measured using a suitable precision thermometer readout.

For accurate measurements, the individual calibration coefficients or correction values supplied with the thermometer should be used where supported by the measuring instrument.

Four-Wire Resistance Measurement

The Additel AccuMac AM 1612A uses a four-wire connection.

Four-wire resistance measurement helps eliminate the influence of connecting lead resistance.

This is particularly important for accurate Pt100 measurements.

In a two-wire configuration, the resistance of the connecting cables contributes directly to the measured resistance.

A four-wire configuration separates the current supply and voltage measurement circuits.

This allows the resistance of the sensing element to be determined more accurately.

The recommended measuring current is:

1 mA

A suitable precision resistance thermometer readout is required to convert the measured resistance into temperature.

Fast Response Time

The Additel AccuMac AM 1612A provides a fast thermal response.

The manufacturer specifies:

4 seconds

This value represents the time required to reach approximately 63% of a temperature step under specified conditions in moving water.

The actual response time depends on the measurement medium, flow conditions, sensor installation and thermal contact.

Fast response is particularly useful when checking temperature changes in environmental chambers or liquid calibration baths.

Low Self-Heating

When electrical current flows through a platinum resistance thermometer, a small amount of heat is generated.

This effect is known as self-heating.

Self-heating can cause the sensor temperature to differ slightly from the temperature of the surrounding medium.

The manufacturer specifies a self-heating characteristic of:

75 mW/°C

The actual self-heating error depends on the measuring current and the thermal conditions surrounding the sensor.

For high-accuracy measurements, self-heating should be considered in the measurement uncertainty evaluation.

Suitable for Environmental Chambers

The Additel AccuMac AM 1612A is particularly suitable for temperature measurement in environmental chambers.

Environmental chambers are used to generate controlled temperature conditions for testing, calibration and product validation.

The full immersion design allows flexible sensor positioning.

This is useful when the transition junction and connecting leads are exposed to the same temperature conditions as the sensing element.

Typical applications include temperature mapping, chamber verification and reference measurements.

For temperature mapping applications, multiple thermometers may be used to determine spatial temperature differences.

Ideal for Freezers and Low-Temperature Applications

The Additel AccuMac AM 1612A is suitable for low-temperature applications.

Its operating range extends down to −200 °C.

This allows the thermometer to be used in ultra-low-temperature freezers and other controlled low-temperature environments.

The compact sensing probe is particularly useful when measurement space is limited.

The moisture-resistant construction provides additional advantages in applications where condensation or humidity may occur.

For cryogenic applications, the complete measurement setup must be suitable for the intended temperature and medium.

Suitable for Liquid Calibration Baths

The Additel AccuMac AM 1612A can be used in compatible liquid calibration baths.

The manufacturer identifies common heat transfer fluids such as:

• Ethanol
• Silicone oil
• Mineral oil

The sealed construction helps prevent moisture ingress.

This allows the thermometer to be immersed in suitable calibration liquids.

The selected liquid must be compatible with the thermometer materials and suitable for the operating temperature.

A precision resistance thermometer readout is required for accurate temperature measurement.

ISO/IEC 17025 Accredited Calibration Included

Every Additel AccuMac AM 1612A is supplied with an ISO/IEC 17025 accredited calibration.

This provides documented traceability of the thermometer’s measurement characteristics.

The calibration certificate contains information relevant to the thermometer’s metrological performance.

For high-accuracy applications, the calibration results and associated uncertainties should be considered when evaluating measurement uncertainty.

Regular recalibration is recommended to monitor long-term stability.

The appropriate calibration interval depends on the application, operating conditions and required measurement uncertainty.

Technical Highlights

The Additel AccuMac AM 1612A offers the following technical characteristics:

Available Connection Options

The Additel AccuMac AM 1612A is available with different connection configurations.

These allow the thermometer to be connected to suitable temperature measurement instruments.

The current manufacturer ordering information identifies the following options:

The Additel smart connector is designed for use with compatible Additel temperature instruments.

The appropriate connector should be selected according to the measurement system.

Suitable adapters are available for connecting the thermometer to other compatible instruments.

Calibration Service by europascal

Accurate temperature measurement requires reliable reference thermometers and regular calibration.

europascal provides professional calibration services for temperature measurement instruments and reference sensors.

When using the Additel AccuMac AM 1612A for comparison measurements, the complete measurement uncertainty must be evaluated.

Relevant uncertainty contributions include the calibration uncertainty of the reference thermometer, long-term drift, measurement repeatability, self-heating and the uncertainty of the resistance measurement instrument.

Additional effects may arise from thermal gradients, sensor positioning and insufficient thermal equilibrium.

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

Why Choose the Additel AccuMac AM 1612A?

The Additel AccuMac AM 1612A combines excellent temperature measurement performance with a compact and versatile design.

Its wide temperature range from −200 °C to +160 °C covers numerous industrial and laboratory applications.

The full immersion capability makes the thermometer particularly useful in environments where conventional reference sensors are difficult to install.

The compact stainless steel probe allows measurements in confined spaces.

Excellent short-term stability, low hysteresis and good thermal shock performance support reproducible temperature measurements.

The four-wire connection reduces errors caused by connecting lead resistance.

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

For calibration laboratories, pharmaceutical manufacturers, research facilities and industrial users requiring a reliable precision reference thermometer, the Additel AccuMac AM 1612A provides an excellent combination of accuracy, stability and flexibility.

Typical Applications for the Additel AccuMac AM 1612A

The Additel AccuMac AM 1612A is suitable for a wide range of professional temperature measurement applications.

Typical applications include:

• Temperature calibration
• Precision temperature measurement
• Pt100 reference measurements
• Environmental chamber validation
• Climate chamber calibration
• Temperature mapping
• Ultra-low-temperature freezer verification
• Refrigeration applications
• Liquid calibration baths
• Sterilizer temperature measurement
• Pharmaceutical manufacturing
• Biotechnology
• Laboratory quality assurance
• Industrial temperature monitoring
• Research and development
• Calibration laboratories
• Temperature metrology
• Reference thermometer applications

The combination of full immersion capability, excellent stability and a wide operating temperature range makes the Additel AccuMac AM 1612A a professional solution for demanding temperature measurement and calibration applications.

Find more Additel products here.

Manufacturer information for the Additel AccuMac AM 1612A can be found on the official Additel website.

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