Additel ADT 227Ex is an advanced intrinsically safe documenting multifunction process calibrator for pressure, temperature and electrical calibration in demanding industrial environments. Designed for professional field technicians and calibration laboratories, it combines precision electrical measurement and sourcing, RTD and thermocouple functions, pressure measurement, automated calibration tasks and optional full HART communication in one rugged handheld platform.
The ADT 227Ex is the intrinsically safe version of Additel’s high-accuracy ADT 227 process calibrator. It carries ATEX and IECEx certification with an explosion protection rating of Ex ia IIC T4 Ga, making it suitable for approved applications in potentially explosive environments such as oil and gas facilities, refineries, chemical plants, petrochemical facilities and gas processing installations.
Additel specifies electrical measurement accuracy down to 0.005 % of reading + 0.005 % of full scale for the ADT 227 series. The platform also supports high-static differential pressure measurement with accuracy down to 0.002 % FS when used with suitable pressure modules.
The Additel ADT 227Ex supports measurement, sourcing and simulation of pressure, temperature and electrical signals. Two pressure module ports allow flexible pressure configurations, while the integrated barometer provides additional functionality for pressure measurement applications.
For temperature calibration, the ADT 227Ex supports thermocouples and RTDs. Improved cold junction compensation provides high-quality thermocouple measurement performance and short stabilization times.
A major advantage of the ADT 227Ex is its documenting capability. Up to 1,000 documented calibration tasks can be stored in the intrinsically safe version. Automated tasks can collect measurement data and perform calculations such as Pass/Fail evaluations and hysteresis determination. Calibration information can subsequently be transferred to Additel ACal software for calibration management.
The optional ADT 227Ex-HART configuration adds a full HART communicator. It allows technicians to monitor, control, maintain and calibrate compatible HART instrumentation directly from the calibrator.
At europascal, we provide professional calibration solutions for pressure, temperature and electrical measurement applications. The ADT 227Ex can be combined with suitable intrinsically safe Additel pressure modules and accessories to create a comprehensive field calibration system.
For professional calibration and metrological traceability of process calibrators, pressure modules, temperature measuring equipment and electrical measuring instruments, use the europascal Calibration Service.
Your Benefits at a Glance
- Intrinsically safe documenting process calibrator
- ATEX and IECEx certified
- Ex ia IIC T4 Ga explosion protection
- Electrical accuracy down to 0.005 % RD + 0.005 % FS
- Pressure measurement with external Additel modules
- Dual pressure module ports
- High-static differential pressure measurement
- Differential pressure accuracy down to 0.002 % FS
- Built-in barometer
- Voltage measurement and sourcing
- Current measurement and sourcing
- Resistance measurement and simulation
- Thermocouple measurement and simulation
- RTD measurement and simulation
- Frequency and pulse functions
- 22 V loop power on ADT 227Ex
- Optional full HART communication
- Automated documenting calibration tasks
- Up to 1,000 documented tasks on ADT 227Ex
- Automatic Pass/Fail evaluation
- Automatic hysteresis calculations
- Pressure leak test application
- Safety valve test application
- Analog transmitter calibration
- Large color touchscreen
- Transflective display for outdoor visibility
- USB Type-C communication
- Bluetooth communication
- IP67 protection
- Rugged field construction
- Rechargeable Ex-approved battery
- ISO/IEC 17025 accredited calibration certificate with data included
Intrinsically Safe Process Calibration
The defining feature of the Additel ADT 227Ex is its intrinsically safe design.
Calibration work in potentially explosive atmospheres requires equipment specifically approved for the relevant hazardous environment.
Additel specifies the ADT 227Ex with:
ATEX and IECEx certification
and an explosion protection rating of:
Ex ia IIC T4 Ga
The intrinsically safe design makes the calibrator suitable for approved applications in industries such as:
- Oil and gas
- Petroleum refining
- Chemical processing
- Petrochemical production
- Pharmaceutical manufacturing
- Energy
- Industrial gas processing
The applicable certificate, hazardous-area classification and operating conditions must always be checked before using the instrument in an explosive atmosphere.
High Electrical Accuracy
The Additel ADT 227Ex is the high-accuracy model within Additel’s intrinsically safe multifunction process calibrator family.
Additel specifies electrical accuracy for the ADT 227 series down to:
0.005 % RD + 0.005 % FS
This high measurement performance makes the instrument suitable for demanding process calibration applications.
The ADT 227Ex can measure and generate a variety of electrical signals required for industrial instrumentation.
Electrical Measurement and Sourcing
The calibrator supports electrical functions used throughout the process industry.
Depending on the selected function, these include:
- Voltage
- Current
- Resistance
- Frequency
- Pulse signals
The ability to both measure and source signals allows the same instrument to test transmitters, indicators, controllers and data acquisition equipment.
4–20 mA Process Loops
The Additel ADT 227Ex is well suited for calibration and troubleshooting of industrial:
4–20 mA process loops
These signals are commonly used by:
- Pressure transmitters
- Temperature transmitters
- Flow transmitters
- Level transmitters
- Differential pressure transmitters
- Process controllers
The ADT 227Ex can measure current signals and generate defined current values for testing process instrumentation.
22 V Loop Power
The intrinsically safe ADT 227Ex provides:
22 V loop power
with a maximum current of:
25 mA
Additel specifies the loop supply with an accuracy of ±10 %.
This function allows compatible two-wire transmitters to be powered during calibration without requiring a separate loop power supply.
The standard non-Ex ADT 227 uses a 24 V loop supply, making this one of the technical differences that should be considered when selecting between the standard and intrinsically safe versions.
Optional Full HART Communication
The ADT 227Ex-HART version incorporates full HART communication functionality.
It includes an extensive Device Description library for compatible HART transmitters.
The HART configuration allows technicians to:
- Monitor HART instrumentation
- Configure compatible transmitters
- Perform calibration
- Perform maintenance
- Troubleshoot smart instrumentation
This makes the ADT 227Ex-HART particularly useful for modern process plants using intelligent field transmitters.
Pressure Measurement
The Additel ADT 227Ex can be connected to compatible intrinsically safe Additel pressure modules.
Additel lists the ADT161Ex intrinsically safe digital pressure modules as compatible accessories for the ADT 227Ex.
The modular concept allows different pressure ranges to be selected according to the individual calibration workload.
This enables one ADT 227Ex to serve as the central readout and documenting platform for multiple pressure ranges.
Dual Pressure Module Ports
The ADT 227 series provides:
two pressure module ports
Two compatible pressure modules can therefore be connected for advanced pressure measurement applications.
This is particularly useful for:
- Differential pressure measurement
- Filter testing
- Pump testing
- Pressure drop measurement
- Simultaneous pressure measurements
High-Static Differential Pressure
One of the advanced functions of the Additel ADT 227Ex is high-static differential pressure measurement.
Two suitable pressure sensors are used together with Additel’s calculation technology.
Additel specifies high-static differential pressure mode accuracy down to:
0.002 % FS
for the applicable configuration.
This capability is particularly useful when a relatively small pressure difference must be measured in the presence of a much higher static pressure.
Built-In Barometer
The ADT 227 series includes an integrated barometer.
This provides additional flexibility for pressure measurement applications and can support pressure mode conversions according to the instrument configuration.
The combination of barometric measurement and external pressure modules makes the ADT 227Ex a flexible platform for field pressure calibration.
Pressure Transmitter Calibration
A typical application for the Additel ADT 227Ex is pressure transmitter calibration.
A suitable pressure source generates the required test pressure.
An intrinsically safe pressure module measures the reference pressure.
The ADT 227Ex simultaneously measures the transmitter’s electrical output.
For a conventional industrial transmitter, this will commonly be:
4–20 mA
This allows pressure input and electrical output to be evaluated using one portable calibration platform.
RTD Measurement and Simulation
The ADT 227Ex supports RTD-based temperature calibration.
A resistance thermometer can be measured directly by the calibrator.
Alternatively, the instrument can simulate the resistance corresponding to a specified RTD temperature.
RTD simulation is useful for calibration of:
- Temperature transmitters
- Temperature indicators
- Process controllers
- Recorders
- PLC temperature inputs
This allows the electronic portion of a temperature measurement chain to be calibrated without requiring a physical temperature source.
Thermocouple Measurement
The Additel ADT 227Ex provides improved thermocouple measurement performance.
Additel highlights improved cold junction compensation and stabilization performance within the ADT 227 series.
Accurate cold junction compensation is important because thermocouple measurements depend on both the measuring junction and the reference junction temperature.
The ADT 227Ex can therefore be used to measure common industrial thermocouple signals directly.
Thermocouple Simulation
The calibrator can also simulate thermocouple signals.
The operator enters the desired temperature and the ADT 227Ex generates the corresponding thermoelectric voltage.
This provides an efficient method for calibrating:
- Thermocouple transmitters
- Temperature indicators
- Data loggers
- Process controllers
- Recorders
without using an actual thermocouple sensor.
Documenting Process Calibrator
A major difference between a conventional multifunction calibrator and the Additel ADT 227Ex is its documenting functionality.
Calibration procedures can be prepared as tasks and stored directly in the calibrator.
The ADT 227Ex supports up to:
1,000 documented tasks
in its onboard memory.
This enables technicians to perform predefined calibration procedures in the field without relying on paper worksheets.
Automated Calibration Tasks
Documenting tasks can be created for instruments involving:
- Pressure
- Temperature
- Flow
- Process loops
During execution, many procedures can automatically collect measurement data.
The ADT 227Ex can also perform automatic performance evaluations such as:
Pass / Fail
and:
hysteresis calculations
This reduces manual calculations and supports standardized calibration procedures.
Paperless Calibration Management
Documented calibration tasks can be integrated into Additel’s ACal software.
This provides a route from prepared calibration procedures to field execution and subsequent calibration management.
Paperless workflows can reduce:
- Manual data entry
- Transcription errors
- Paper documentation
- Repetitive calculations
and improve consistency across calibration procedures.
Pressure Leak Test
The ADT 227 series includes a dedicated pressure leak test application.
The application monitors pressure change and automatically calculates the pressure drop.
This helps technicians determine whether a pressurized system meets the defined leak criteria.
Typical applications include:
- Pipelines
- Pressure vessels
- Process systems
- Pneumatic assemblies
- Hydraulic systems
Safety Valve Testing
The Additel ADT 227Ex also provides a dedicated safety valve test function.
According to Additel, the application captures the pressure release point by taking:
10 readings per second
during a valve crack test.
This makes the calibrator useful for determining the opening point of suitable pressure relief and safety devices.
Analog Transmitter Calibration
The onboard applications also support analog transmitter calibration.
The ADT 227Ex can combine reference input measurement with electrical output measurement to evaluate transmitter performance.
This is useful for pressure and temperature transmitters as well as other process instruments using standard analog output signals.
Large Smartphone-Like Touchscreen
The Additel ADT 227Ex uses a large color touchscreen with a menu-driven interface.
Additel describes the interface as smartphone-like, allowing users to navigate through measurement, sourcing and calibration applications intuitively.
The Ex version uses an advanced transflective color LCD.
This improves visibility when the calibrator is used outdoors in direct sunlight.
Rugged IP67 Construction
All ADT 227 family models are designed for demanding field conditions.
Additel specifies:
IP67 protection
and reports qualification testing including:
- 1 m drop testing
- 4G vibration testing
- Xenon exposure
- 130 g steel-ball display impact testing
These features make the ADT 227Ex suitable for regular field calibration work in industrial environments.
USB Type-C and Bluetooth
The ADT 227 platform supports modern communication options including:
USB Type-C
and:
Bluetooth
For the Ex version, Additel provides dedicated approved accessories, including an Ex USB cable and Ex rechargeable battery.
Only accessories approved for the relevant intrinsically safe configuration should be used when hazardous-area requirements apply.
ISO/IEC 17025 Accredited Calibration
Additel supplies the ADT 227 series with an:
ISO/IEC 17025 accredited calibration certificate with data
included.
This is particularly valuable for professional calibration laboratories and industrial quality systems requiring documented metrological traceability.
ADT 227 or ADT 227Ex?
The standard Additel ADT 227 and intrinsically safe Additel ADT 227Ex share the same advanced multifunction process calibrator concept.
The ADT 227Ex is specifically designed for approved use in potentially explosive environments.
Important differences include its ATEX and IECEx certification, Ex-specific battery and accessories, 22 V loop power and intrinsically safe operating restrictions.
Some functions and specifications of the standard ADT 227 are therefore not automatically available on the ADT 227Ex.
For hazardous-area work, the exact certification and permitted configuration must always be checked before operation.
Technical Highlights
The Additel ADT 227Ex provides a powerful combination of intrinsically safe calibration and documentation:
- Intrinsically safe multifunction process calibrator
- Documenting calibrator
- ATEX certified
- IECEx certified
- Ex ia IIC T4 Ga
- Electrical accuracy down to 0.005 % RD + 0.005 % FS
- Pressure measurement
- Dual pressure module ports
- ADT161Ex pressure module compatibility
- High-static differential pressure mode
- Accuracy down to 0.002 % FS in applicable differential pressure mode
- Built-in barometer
- Voltage measurement and sourcing
- Current measurement and sourcing
- Resistance measurement and simulation
- RTD measurement and simulation
- Thermocouple measurement and simulation
- Frequency and pulse functions
- 22 V loop power
- Optional full HART communication
- Up to 1,000 documenting tasks
- Automatic Pass/Fail evaluation
- Hysteresis calculations
- Leak testing
- Safety valve testing
- Analog transmitter calibration
- Color touchscreen
- Transflective display
- IP67
- USB Type-C
- Bluetooth
- Rechargeable Ex battery
- ISO/IEC 17025 accredited calibration with data
Why Choose the Additel ADT 227Ex?
The Additel ADT 227Ex combines high-accuracy multifunction process calibration, automated documentation and intrinsically safe operation in one portable instrument.
Its ATEX and IECEx certification with Ex ia IIC T4 Ga protection makes it suitable for approved calibration work in potentially explosive industrial environments.
Electrical accuracy down to 0.005 % RD + 0.005 % FS provides the performance required for demanding process instrumentation, while dual pressure module ports extend the calibrator into flexible pressure and differential pressure applications.
RTD and thermocouple measurement and simulation enable temperature transmitter calibration, while current, voltage and resistance functions cover common electrical process signals.
The optional ADT 227Ex-HART configuration adds full HART communication for compatible smart transmitters.
Documenting functionality is another major advantage. Up to 1,000 calibration tasks can be stored in the ADT 227Ex, with automated data collection, Pass/Fail evaluation and hysteresis calculations helping to standardize field calibration procedures.
The IP67 enclosure, transflective color touchscreen and rugged construction make the instrument suitable for demanding field use.
For calibration technicians working in oil and gas, chemical, petrochemical, pharmaceutical, energy and other process industries, the ADT 227Ex provides a powerful combination of metrological performance, documentation and hazardous-area capability.
At europascal, we can configure the ADT 227Ex with suitable intrinsically safe Additel pressure modules and accessories for your individual calibration requirements.
For professional calibration and metrological traceability of process calibrators, pressure modules, electrical measuring equipment and temperature measuring instruments, use the europascal Calibration Service.
Manufacturer information is available on the official Additel ADT 227 product page.
