Additel ADT220 is a versatile multifunction loop calibrator designed for calibration, testing, troubleshooting and maintenance of industrial process loops and electrical process instruments. Unlike a conventional mA-only loop calibrator, the ADT220 combines precision current and voltage measurement with current and voltage sourcing, transmitter simulation, loop continuity testing, switch capture and integrated 24 V loop power in one compact handheld instrument.

With electrical accuracy down to 0.01% of reading, the Additel ADT220 provides the performance required for demanding process calibration applications. The instrument measures DC current from -30 to 30 mA with a resolution of 0.1 µA and DC voltage up to ±60 V. It also provides a dedicated high-resolution millivolt measurement range from -300 to 300 mV with 1 µV resolution.

For signal generation, the ADT220 can source current, millivolt and voltage signals. This makes the calibrator suitable for testing transmitters, indicators, controllers, PLC inputs and other process instrumentation without requiring multiple separate electrical standards.

An integrated 24 V loop power supply simplifies the testing of two-wire transmitters, while the loop continuity function provides resistance measurement up to 2000 Ω. Switch capture functionality further expands the range of industrial devices that can be tested with a single instrument.

At europascal, we provide professional solutions for process measurement, pressure measurement and electrical calibration. The Additel ADT220 is particularly suitable for technicians and calibration professionals who require more electrical functionality than a conventional loop calibrator while retaining a compact portable design.

For professional calibration and metrological traceability of the Additel ADT220 and other process measuring instruments, use the europascal Calibration Service.

Your Benefits at a Glance

The Additel ADT220 combines precision electrical measurement and signal generation with practical process loop functions in one multifunction calibrator.

Key benefits include:

• Multifunction loop calibrator for process applications
• Electrical accuracy down to 0.01% of reading
• DC current measurement from -30 to 30 mA
• Current resolution down to 0.1 µA
• Current sourcing for process loop simulation
• DC voltage measurement up to ±60 V
• High-resolution millivolt measurement
• Millivolt measurement from -300 to 300 mV
• Millivolt resolution of 1 µV
• Voltage and millivolt sourcing
• Transmitter simulation
• Integrated 24 V loop power supply
• Loop continuity measurement up to 2000 Ω
• Switch capture functionality
• Suitable for 4–20 mA process loops
• Designed for calibration, repair and maintenance
• Compact handheld design
• Ideal for laboratory and field applications

Multifunction Process Loop Calibration

The Additel ADT220 is designed for users who require more than a conventional 4–20 mA loop calibrator.

Industrial process instrumentation uses a variety of electrical signals to transmit and process measurement information.

These include:

• Current
• Millivolt
• Voltage
• Resistance
• Switching signals

The ADT220 combines several of these functions in one handheld calibration instrument.

This reduces the number of separate test instruments required when troubleshooting, commissioning or calibrating process equipment.

Current Measurement up to ±30 mA

The Additel ADT220 measures DC current over the range:

-30.0000 to 30.0000 mA

with a resolution of:

0.1 µA

and a specified accuracy of:

0.01% of reading + 1.5 µA.

This range completely covers conventional 4–20 mA process signals while providing additional measurement capability above and below the standard process range.

Typical applications include testing the output of:

• Pressure transmitters
• Temperature transmitters
• Flow transmitters
• Level transmitters
• Signal conditioners
• Process controllers

The high resolution allows small changes in the loop current to be detected accurately.

Current Source and Simulation

In addition to measuring current, the Additel ADT220 can source and simulate current signals.

This allows the calibrator to replace a process transmitter temporarily and provide a controlled signal to another device within the measurement chain.

Typical applications include testing:

• PLC analog inputs
• Process indicators
• Controllers
• Data acquisition systems
• Recorders
• Control systems

For externally powered loops, the transmitter simulation function allows the ADT220 to control the current in a manner similar to a two-wire process transmitter.

This makes it possible to test different sections of a process loop independently.

High-Resolution Millivolt Measurement

The Additel ADT220 includes a dedicated millivolt measurement range from:

-300.000 to 300.000 mV

with a resolution of:

1 µV.

The specified measurement accuracy is:

0.01% of reading + 15 µV.

The high-resolution millivolt range expands the ADT220 beyond basic current-loop applications.

Small DC voltage signals can be measured accurately without requiring a separate precision multimeter for many process calibration tasks.

DC Voltage Measurement up to ±60 V

For higher voltage signals, the Additel ADT220 provides DC voltage measurement from:

-60.0000 to 60.0000 V

with a resolution of:

0.1 mV.

The specified accuracy is:

0.01% of reading + 3 mV.

This broad voltage measurement range is useful for checking:

• Process signals
• Power supplies
• Loop supplies
• Control signals
• Industrial transmitters
• Electrical interfaces

Combining current, millivolt and voltage measurement in one instrument provides technicians with a versatile tool for troubleshooting process systems.

Voltage and Millivolt Source

The Additel ADT220 is not limited to measuring electrical signals.

It can also generate millivolt and voltage signals for testing the response of process instrumentation.

A defined electrical signal can therefore be applied directly to the device under test.

This is useful when calibrating or verifying:

• Process indicators
• Controllers
• Signal conditioners
• PLC inputs
• Data acquisition systems
• Electrical measuring instruments

Combining source and measurement functions allows the ADT220 to replace several individual electrical test instruments in many process calibration applications.

Integrated 24 V Loop Power

The Additel ADT220 provides an integrated:

24 V loop power supply.

This is particularly useful when testing two-wire process transmitters.

Instead of using an additional external power supply, the transmitter can be powered directly from the calibrator during suitable test and calibration procedures.

This simplifies the test setup and reduces the amount of equipment required for field calibration.

For technicians working at different locations within an industrial plant, this can provide a significant practical advantage.

Loop Continuity Test

An important additional feature of the Additel ADT220 is its loop continuity measurement.

The specified range is:

0 to 2000.0 Ω

with a resolution of:

0.1 Ω.

Additel specifies an accuracy of:

0.02% of reading + 0.2 Ω.

The continuity function can be used to check the electrical integrity of process loops, cables and connections.

This can be particularly useful during troubleshooting.

If a process signal is missing or incorrect, the technician can use the same instrument to check both the electrical process signal and the continuity of the associated wiring.

Switch Capture Function

The Additel ADT220 also provides switch capture capability.

Switches are widely used in industrial process applications for functions such as:

• Pressure monitoring
• Temperature monitoring
• Level detection
• Safety functions
• Alarm generation
• Limit monitoring

The switch capture function allows the technician to detect the switching point or state of a suitable device.

For contacts with electrical potential, Additel specifies a supported voltage range from:

3 V to 24 V.

This functionality expands the ADT220 beyond standard analog process signal calibration.

Ideal for 4–20 mA Applications

Although the ADT220 offers substantially more functionality than a basic loop calibrator, conventional 4–20 mA process loops remain an important application.

In a standard 4–20 mA system:

4 mA represents 0%

and:

20 mA represents 100%

of the configured measurement span.

By measuring, sourcing and simulating current, the Additel ADT220 can be used to test different sections of this signal chain.

The technician can determine whether an incorrect process value originates from the transmitter, wiring, indicator, controller or receiving system.

Transmitter Calibration

The Additel ADT220 is particularly suitable for electrical testing of process transmitters.

Typical transmitter applications include measurement of:

• Pressure
• Temperature
• Flow
• Level
• Humidity
• Force

The transmitter converts the physical measurement into an electrical output signal.

The ADT220 can measure this signal or simulate a defined signal to test the receiving system.

Its integrated loop power supply can also provide the electrical supply required by suitable two-wire transmitters.

Process Troubleshooting

Troubleshooting is one of the key applications of a multifunction loop calibrator.

When an industrial process loop does not operate correctly, several components may be responsible.

Possible causes include:

• Incorrect transmitter output
• Damaged wiring
• Poor electrical connections
• Incorrect loop supply
• Faulty analog input
• Incorrect controller configuration
• Defective switches

Because the Additel ADT220 combines current measurement, voltage measurement, signal generation, continuity testing and switch capture, several potential causes can be investigated with one instrument.

This can reduce troubleshooting time and simplify field service.

Calibration, Repair and Maintenance

Additel describes the ADT220 as a process tool for calibration, repair and maintenance of various loop devices.

This makes the instrument suitable for several departments within an industrial organization.

Typical users include:

• Calibration technicians
• Service technicians
• Maintenance engineers
• Commissioning engineers
• Instrumentation technicians
• Process engineers

The combination of source and measurement functions means the same instrument can be used for both scheduled calibration and unscheduled troubleshooting.

Laboratory and Field Applications

The compact design of the Additel ADT220 makes it suitable for use both in a calibration laboratory and directly at the process installation.

In the laboratory, its electrical source and measurement functions can be used for controlled calibration procedures.

In the field, the same instrument can be used for:

• Troubleshooting
• Commissioning
• Functional testing
• Loop checks
• Preventive maintenance
• Transmitter testing

Using one multifunction instrument for both applications can simplify equipment management and technician training.

More Than a Conventional Loop Calibrator

The ADT220 should not be considered simply as an alternative to a basic mA loop calibrator.

Its combination of:

• mA measurement
• mA source
• mA simulation
• mV measurement
• mV source
• Voltage measurement
• Voltage source
• Loop continuity
• Switch capture
• 24 V loop power

provides significantly broader process calibration capability.

This is particularly valuable for users who regularly encounter different electrical signal types during process calibration and maintenance.

Technical Highlights

Additel ADT220 Compared with a Standard Loop Calibrator

A conventional loop calibrator focuses primarily on 4–20 mA current signals.

The Additel ADT220 provides additional functionality for users who encounter a broader variety of electrical process signals.

Alongside current measurement, source and simulation, the ADT220 provides high-resolution millivolt measurement, voltage measurement up to ±60 V, voltage and millivolt sourcing, loop continuity testing and switch capture.

This makes the ADT220 particularly attractive when one portable instrument is required for both calibration and troubleshooting.

Instead of carrying a loop calibrator, voltage source, multimeter and continuity tester for different tasks, many of these functions can be covered by the ADT220.

Why Choose the Additel ADT220?

The Additel ADT220 combines the portability of a loop calibrator with the expanded electrical functionality of a multifunction process calibration instrument.

Its 0.01% of reading performance provides the accuracy required for demanding process applications.

Current measurement from -30 to 30 mA completely covers standard 4–20 mA signals, while current sourcing and simulation allow transmitters, indicators and control system inputs to be tested.

High-resolution millivolt measurement down to 1 µV resolution and DC voltage measurement up to ±60 V significantly expand the electrical workload.

The integrated 24 V loop power supply simplifies transmitter testing, while loop continuity measurement up to 2000 Ω provides an additional diagnostic function for cables and process wiring.

Switch capture further expands the instrument for testing industrial switching devices.

The result is a compact calibration tool suitable for calibration laboratories, industrial maintenance departments, commissioning engineers and field service technicians.

At europascal, we provide professional solutions for process measurement, electrical calibration and pressure calibration. We can assist you in selecting the appropriate Additel calibration equipment for your individual application.

For professional calibration and metrological traceability of the Additel ADT220 and other process measuring instruments, visit the europascal Calibration Service.

Discover more Additel products at europascal.

Manufacturer information about the Additel ADT220 is available on the official Additel website.