Additel ADT 681A is a high-precision digital pressure gauge designed for professional pressure measurement and demanding calibration applications. The instrument combines high accuracy with advanced data logging, wireless communication and a robust design for both laboratory and field use.

The ADT 681A series was developed by Additel for applications where the accuracy and functionality of a conventional industrial pressure gauge are no longer sufficient. Pressure ranges up to 60,000 psi / 4,200 bar enable applications from low-pressure measurement to demanding high-pressure calibration.

Depending on the configuration, several accuracy classes are available. The Additel ADT 681A can be specified with 0.01 % FS, 0.02 % FS or 0.05 % FS accuracy. A reading-based version is also available, providing 0.02 % FS from 0 to 20 % of the measurement range and 0.1 % of reading above 20 % of the measurement range.

This high level of measurement performance makes the ADT 681A particularly suitable for comparison measurements, measuring equipment monitoring, reference measurements and professional pressure calibration.

An integrated data logger further extends its capabilities. Up to 10 million measurement records can be stored. Bluetooth communication also enables connection to mobile devices and the Additel Link Mobile App.

At europascal, you receive professional solutions for pressure measurement and pressure calibration. For regular calibration and metrological traceability of your ADT 681A and other pressure measuring instruments, europascal also provides a professional Calibration Service.

Your Benefits at a Glance

• High-precision digital pressure gauge
• Pressure ranges up to 4,200 bar
• Maximum pressure range up to 60,000 psi
• Accuracy down to 0.01 % FS
• 0.02 % FS accuracy class available
• 0.05 % FS accuracy class available
• Reading-based accuracy down to 0.1 % of reading
• Gauge pressure measurement
• Compound pressure measurement
• Absolute pressure indication with optional barometer
• Differential-pressure ranges available
• Optional integrated barometer
• Barometer accuracy ±55 Pa
• Full temperature compensation
• Temperature compensation from −10 °C to 50 °C
• Integrated data logger
• Storage for up to 10,000,000 measurement records
• Bluetooth communication
• Additel Link Mobile App connectivity
• Large, easy-to-read display
• Percentage-of-range indication
• Graphical pressure indication
• Minimum and maximum display
• TARE function
• Leak test function
• Ambient pressure and temperature display
• Adjustable measurement rate
• IP67 protection
• Robust construction for laboratory and field use
• Intrinsically safe ADT 681AEx version available
• ISO/IEC 17025 accredited calibration with calibration data according to the manufacturer

The combination of high accuracy, an exceptionally wide pressure range, extensive data logging and modern communication makes the Additel ADT 681A a powerful solution for professional pressure metrology.

Designed for Demanding Calibration Applications

The Additel ADT 681A was developed for applications requiring reliable and highly accurate pressure measurements.

Typical applications include:

• Calibration laboratories
• DAkkS accredited calibration laboratories
• In-house calibration laboratories
• Quality assurance
• Measuring equipment monitoring
• Research and development
• Mechanical engineering
• Plant engineering
• Process industries
• Energy supply
• Production testing
• Test benches
• Maintenance
• Mobile calibration service

A typical application is pressure gauge calibration.

The ADT 681A and the device under test are connected to a suitable pressure source. The indication of the device under test can then be compared directly with the high-accuracy reference value displayed by the ADT 681A.

The instrument is therefore suitable for calibration and comparison measurements involving precision pressure gauges, general-purpose pressure gauges and other pressure instruments.

Pressure Ranges up to 4,200 bar

The Additel ADT 681A is available in a wide selection of pressure ranges.

The maximum measurement range extends to:

60,000 psi

or

4,200 bar

This exceptionally broad range allows the digital pressure gauge to be used for conventional industrial pressure measurement as well as demanding high-pressure calibration.

Available configurations extend from very low differential and gauge pressure ranges to high-pressure versions.

When selecting the appropriate measurement range, it is important to consider that many accuracy specifications are based on full scale.

Selecting a range that closely matches the actual application can therefore help minimize the absolute measurement uncertainty contribution associated with the pressure gauge.

europascal can assist you in selecting the appropriate pressure range and accuracy class for your application.

Accuracy Down to 0.01 % FS

One of the most important features of the Additel ADT 681A is its high pressure measurement accuracy.

Several accuracy options are available:

ADT 681A-01
0.01 % FS

ADT 681A-02
0.02 % FS

ADT 681A-05
0.05 % FS

A reading-based RD version is also available.

For this version, the specified accuracy is:

0 to 20 % of range: ±0.02 % FS

and

20 to 110 % of range: ±0.1 % of reading

This allows the ADT 681A to be selected according to the required pressure range and accuracy level.

Full Temperature Compensation

Pressure sensors can be sensitive to changes in ambient temperature. For high-accuracy pressure measurements, this influence needs to be carefully controlled.

The Additel ADT 681A is fully temperature compensated over a range from:

−10 °C to 50 °C

This enables the instrument to be used both under controlled laboratory conditions and for mobile measurements where ambient temperatures may vary significantly.

The wide compensated temperature range helps maintain the specified measurement performance outside a conventional calibration laboratory.

Optional Integrated Barometer

For additional flexibility, the Additel ADT 681A can be equipped with an integrated barometer.

The specified accuracy of the optional barometric sensor is:

±55 Pa

Depending on the selected sensor configuration, this supports the indication of gauge and absolute pressure values.

For suitable applications, the optional barometric sensor can reduce the requirement for a separate barometric reference instrument.

Different Pressure Types

Depending on the selected configuration, the Additel ADT 681A supports several pressure types.

These include:

• Gauge pressure
• Compound pressure
• Absolute pressure
• Differential pressure
• Barometric pressure

For suitable configurations, absolute pressure can be calculated using gauge pressure and barometric pressure.

This makes the ADT 681A a flexible platform for a wide variety of pressure measurement applications.

Powerful Data Logger

An important feature of the Additel ADT 681A is its integrated data logger.

The instrument can store up to:

10,000,000 measurement records

This makes the digital pressure gauge particularly suitable for:

• Long-term pressure recording
• Stability measurements
• Pressure tests
• Leak tests
• Process monitoring
• Comparison measurements
• Test bench applications
• Pressure trend recording

The large storage capacity enables extensive measurement sequences without requiring a permanently connected PC.

Bluetooth and Additel Link Mobile App

The Additel ADT 681A provides integrated Bluetooth communication.

This enables the pressure gauge to communicate with the Additel Link Mobile App.

Wireless connectivity makes it possible to observe pressure measurements remotely.

This can be particularly useful for:

• Hard-to-access measurement points
• Pressure tests
• High-pressure applications
• Long-term measurements
• Test benches

The operator does not need to remain directly next to the pressure gauge throughout the entire measurement procedure.

Large, Easy-to-Read Display

The Additel ADT 681A features a large digital display designed for excellent readability.

In addition to the numerical pressure value, a graphical percentage-of-range indication can be displayed.

This provides a quick visual indication of the current pressure relative to the selected measurement range.

Additional information can include:

• Minimum value
• Maximum value
• TARE value
• Ambient temperature
• Barometric pressure
• Leak test results

The combination of numerical and graphical information makes the gauge convenient for both laboratory and field applications.

Integrated Leak Test Function

The Additel ADT 681A provides an integrated function for pressure leak testing.

Pressure changes can be monitored over a defined period.

Combined with the data logger, this makes the instrument suitable for evaluating:

• Pneumatic systems
• Hydraulic systems
• Pipelines
• Valves
• Pressure connections
• Test setups

Pressure changes can be recorded and evaluated after the measurement.

Robust IP67 Construction

The Additel ADT 681A was developed not only for laboratory use but also for demanding mobile field applications.

The instrument provides an IP67 protection rating.

This makes the digital pressure gauge suitable for industrial environments where dust, moisture and demanding operating conditions may be encountered.

Typical field applications include:

• Maintenance
• Mechanical engineering
• Plant engineering
• Process industries
• Mobile calibration
• Pressure testing

Flexible Pressure Connections

The ADT 681A can be ordered with different pressure connections.

Depending on the pressure range and configuration, available connections include:

• 1/4 NPT male
• 1/2 NPT male
• 1/4 BSP male
• 1/2 BSP male
• M20 × 1.5 male

Special Autoclave connections are also available for high-pressure ranges.

This enables the digital pressure gauge to be adapted to different national and international pressure systems.

Technical Highlights

The Additel ADT 681A combines high measurement accuracy with extensive functionality:

• Pressure ranges up to 4,200 bar
• Accuracy down to 0.01 % FS
• 0.02 % FS version
• 0.05 % FS version
• Reading-based version down to 0.1 % of reading
• Gauge pressure
• Compound pressure
• Absolute pressure
• Differential pressure
• Optional barometer with ±55 Pa accuracy
• Temperature compensation from −10 °C to 50 °C
• Data logger for up to 10 million records
• Bluetooth
• Additel Link Mobile App
• Large digital display
• Graphical percentage indication
• Minimum and maximum function
• TARE
• Leak test
• IP67
• Intrinsically safe version available

Technical Specifications

Additel ADT 681A vs. ADT 680A

The Additel ADT 681A is designed for users with significantly higher accuracy requirements than the ADT 680A.

The Additel ADT 680A provides accuracy classes of 0.1 % or 0.2 % FS and is particularly suitable for industrial pressure measurement and monitoring applications.

The Additel ADT 681A, in comparison, provides accuracy down to 0.01 % FS and is therefore particularly suitable for:

• Calibration applications
• Comparison measurements
• Reference measurements
• Measuring equipment monitoring
• Demanding laboratory applications

The ADT 681A also provides an extensive data logging capability with storage for up to 10 million measurement records.

Intrinsically Safe ADT 681AEx Version

For applications in hazardous areas, Additel also provides the ADT 681AEx.

The intrinsically safe version is based on the ADT 681A platform and combines high pressure measurement accuracy with a design intended for corresponding hazardous-area applications.

The choice between the ADT 681A and ADT 681AEx therefore primarily depends on the requirements of the operating environment.

Why Choose the Additel ADT 681A?

The Additel ADT 681A combines high pressure measurement accuracy with an exceptionally wide pressure range and extensive digital functionality.

With accuracy down to 0.01 % FS, the instrument is suitable not only as a digital process pressure indicator but particularly for professional comparison and calibration applications.

Its maximum range of 4,200 bar / 60,000 psi enables applications from low pressure through demanding high-pressure measurement.

The integrated data logger with storage for up to 10 million measurement records supports long-term measurements and complex pressure tests.

Bluetooth and Additel Link provide modern wireless monitoring capabilities.

The robust IP67 construction supports both laboratory operation and mobile field use.

Typical Calibration Applications with the Additel ADT 681A

The Additel ADT 681A is suitable for numerous professional pressure measurement and calibration applications.

Typical devices under test and applications include:

• Precision pressure gauges
• Digital pressure gauges
• Analog pressure gauges
• Pressure sensors
• Pressure transmitters
• Pressure transducers
• Pressure switches
• Blood pressure measuring instruments
• Pressure test benches
• Process pressure measurement
• Leak testing
• Long-term pressure measurement
• Comparison measurements
• Reference measurements

For a conventional comparison calibration, the ADT 681A and the device under test can be connected to a suitable pressure source.

The pressure is changed step by step and the indication of the device under test is compared with the measurement value of the Additel ADT 681A.

The integrated data logging function can simultaneously record measurement values for later evaluation.

At europascal, you can obtain the Additel ADT 681A together with suitable pressure pumps, adapters and additional accessories for professional pressure measurement and calibration.

For regular calibration and metrological traceability of your ADT 681A and other pressure instruments, use the europascal Calibration Service.

Additional measurement and calibration solutions are available through the europascal English homepage.

Discover more products and calibration solutions from europascal.

Manufacturer information about the Additel ADT 681A is available on the official Additel ADT 681A product page.

Download Datasheet