The Additel ADT 780 Pressure Controller is a versatile benchtop pneumatic pressure controller designed for professional pressure calibration in laboratories, workshops and industrial calibration environments. Its modular pressure measurement system, automatic pressure control and integrated electrical process calibration functions combine the capabilities of a laboratory pressure controller with many of the functions normally associated with a process calibrator.
The ADT 780 platform is available with two basic maximum pressure ranges:
ADT 780-1K: -0.95 to 70 bar (-14.5 to 1,000 psi)
and:
ADT 780-3K: -0.95 to 200 bar (-14.5 to 3,000 psi)
The selected base range determines the maximum control range of the pressure controller.
The ADT 780 supports:
Gauge Pressure
and:
Absolute Pressure
and incorporates a barometric reference that allows convenient switching between gauge and absolute pressure modes.
A key advantage of the ADT 780 is its modular pressure measurement architecture. The controller supports one internal Intelligent Pressure Module and one external pressure module, allowing different pressure ranges and accuracy levels to be selected according to the calibration application.
Standard pressure sensors provide a one-year accuracy of:
0.02 % FS
while higher-performance sensor configurations provide substantially improved measurement performance.
Pressure control stability is specified as:
0.003 % FS
The ADT 780 also provides integrated current and voltage measurement, 24 V loop power, HART communication, PROFIBUS PA communication and pressure switch testing.
For professional calibration and metrological traceability of pressure controllers, pressure modules, gauges, transmitters and sensors, visit the europascal calibration service.
Your Benefits at a Glance
The Additel ADT 780 Pressure Controller provides:
- Automated pneumatic pressure control
- Two base ranges up to 70 bar or 200 bar
- Gauge pressure measurement and control
- Absolute pressure capability
- Integrated barometric reference
- Modular pressure measurement architecture
- Interchangeable internal pressure module
- External Intelligent Pressure Module capability
- Standard accuracy of 0.02 % FS
- High-accuracy pressure module options
- Pressure control stability of 0.003 % FS
- User-selectable pressure resolution
- Optional electric pressure pump
- Standalone pressure generation up to 70 bar with optional electric pump
- Current measurement
- Voltage measurement
- 24 V loop power
- Pressure switch testing
- HART communication
- PROFIBUS PA communication
- Large 7-inch color touchscreen
- Wide selection of pressure units
- Clean gas as pressure medium
- Suitable for laboratory and industrial pressure calibration
Two Pressure Ranges up to 200 bar
The Additel ADT 780 platform is available in two main pressure configurations.
ADT 780-1K
The ADT 780-1K provides a pressure range of:
-14.5 to 1,000 psi
or approximately:
-0.95 to 70 bar
This configuration is particularly suitable for common industrial pressure calibration applications.
ADT 780-3K
The ADT 780-3K extends the pressure capability to:
-14.5 to 3,000 psi
or approximately:
-0.95 to 200 bar
The higher-pressure configuration requires an appropriate high-pressure gas supply to reach the full 3,000 psi / 200 bar range.
The two configurations allow laboratories to select the pressure controller that best matches their calibration workload.
Gauge and Absolute Pressure
The Additel ADT 780 Pressure Controller supports:
Gauge Pressure
and:
Absolute Pressure
Gauge pressure is measured relative to atmospheric pressure:
pGauge = pAbsolute – pAtmosphere
The ADT780 incorporates a built-in barometric sensor, allowing the system to switch between gauge and absolute pressure measurements.
This provides considerable flexibility for laboratories calibrating different types of pressure instruments.
Modular Pressure Measurement System
One of the most important features of the ADT 780 is its modular architecture.
The system supports:
one internal Intelligent Pressure Module
and:
one external Intelligent Pressure Module
The internal and external pressure sensors can be exchanged for compatible modules.
This allows the pressure controller to be adapted to different pressure ranges and metrological requirements.
A laboratory can therefore configure the ADT 780 according to the devices being calibrated instead of relying exclusively on a single pressure range.
Standard Accuracy of 0.02 % FS
Standard pressure sensor configurations provide a one-year accuracy specification of:
0.02 % FS
FS means Full Scale.
For a full-scale-based accuracy specification, the absolute contribution depends on the measuring range of the installed pressure module.
Selecting a reference module with a range appropriately matched to the device under test is therefore important when optimizing calibration capability.
High-Accuracy Pressure Modules
Higher-performance pressure modules are available for applications requiring improved measurement capability.
Depending on the selected module generation and pressure range, Additel provides high-accuracy configurations with specifications based on percentage of reading and full scale.
This is particularly advantageous when one controller is used over a wide range of pressures.
The exact accuracy specification should therefore always be evaluated for the specific pressure module installed in the ADT 780.
Pressure Control Stability
The pressure control stability of the Additel ADT 780 is specified as:
0.003 % FS
The stability specification is based on the full scale of the installed control sensor.
Stable pressure control is important for calibration because the reference pressure should remain sufficiently stable while the device under test is read and documented.
This is particularly important when calibrating high-resolution digital pressure instruments.
User-Selectable Resolution
The ADT 780 provides user-selectable pressure resolution of:
4, 5, 6 or 7 digits
depending on the pressure module configuration.
Seven-digit resolution is associated with suitable precision pressure modules.
The selectable display resolution allows the indication to be adapted to the measurement task.
Minimum Controllable Pressure
The minimum controllable pressure depends on the installed pressure module and controller configuration.
For the ADT 780-1K, Additel specifies a minimum control pressure down to:
0.0001 psi
For the ADT 780-3K, the specified value is:
0.001 psi
The actual useful calibration range must nevertheless be evaluated together with the accuracy and uncertainty of the installed pressure module.
Optional Electric Pump
A particularly useful feature of the ADT 780-1K is the optional electric pressure pump.
With the:
ADT780-1K-EPUMP
the controller can generate pressures up to:
1,000 psi / 70 bar
without requiring an external compressed-gas cylinder.
This transforms the ADT 780-1K into a highly integrated standalone automatic pressure calibration system.
Standalone Pressure Generation up to 70 bar
Traditional pneumatic pressure controllers typically require an external nitrogen or compressed-gas supply.
With the optional electric pump, the ADT 780-1K can generate its own pressure up to 70 bar.
This can simplify:
- Laboratory installations
- Mobile calibration systems
- Calibration carts
- Temporary calibration setups
- Production test stations
It also eliminates the need to move or connect a high-pressure gas cylinder for applications within the electric pump’s operating range.
ADT 780-3K up to 200 bar
For higher pressure applications, the ADT 780-3K extends the pneumatic control range to:
200 bar / 3,000 psi
An appropriate high-pressure gas supply is required to achieve the full pressure range.
This makes the ADT 780-3K suitable for calibration of industrial pressure instruments with measuring ranges substantially above the 70 bar capability of the ADT 780-1K.
Clean Gas Pressure Medium
Additel specifies:
Clean gas
as the pressure medium.
Clean pneumatic operation helps protect:
- Internal control valves
- Pressure modules
- Pressure lines
- Reference sensors
- Devices under test
Suitable contamination control is particularly important when different customer instruments are repeatedly connected to the same pressure controller.
Integrated Process Calibrator Functions
The ADT 780 differs from the simplified ADT 780S by providing extensive electrical process calibration functionality.
The ADT 780 includes capabilities for:
- Current measurement
- Voltage measurement
- Millivolt measurement
- 24 V loop power
- Pressure switch measurement
- HART communication
- PROFIBUS PA communication
This combination allows the ADT 780 to perform many pressure transmitter calibration tasks without requiring several separate instruments.
Current and Voltage Measurement
The integrated calibrator function can measure electrical signals associated with pressure transmitters and sensors.
Available measurement functions include:
Current
Voltage
and:
Millivolts
This allows the pneumatic input pressure and electrical output of a pressure transmitter to be evaluated within the same calibration system.
24 V Loop Power
The ADT 780 provides:
24 V loop power
for compatible process transmitters.
A two-wire pressure transmitter can therefore be supplied directly during calibration.
Combined with automatic pressure control and current measurement, this creates an efficient setup for 4–20 mA pressure transmitter calibration.
HART Communication
The Additel ADT 780 supports:
HART communication
for compatible smart process instruments.
HART capability can simplify calibration and service work on smart pressure transmitters by combining digital communication with the pneumatic calibration process.
PROFIBUS PA Communication
The ADT 780 also supports:
PROFIBUS PA
communication.
This extends the system’s capabilities to compatible digital process instrumentation and makes the controller useful in industrial process calibration environments.
Pressure Switch Testing
Pressure switches can be tested using the integrated switch measurement functionality.
During a pressure switch test, the ADT 780 can record the pressure at which the switch:
Sets
and:
Resets
This enables parameters such as switching pressure and hysteresis to be evaluated.
Automatic pressure control can make these tests considerably easier and more repeatable than manual pressure generation.
Pressure Transmitter Calibration
The combination of automatic pressure control and electrical process measurement makes the ADT 780 particularly suitable for pressure transmitter calibration.
A typical 4–20 mA transmitter calibration can include:
- Supplying the transmitter with 24 V loop power
- Generating the required reference pressure
- Stabilizing the pressure
- Measuring the transmitter current
- Recording the pressure and electrical values
- Repeating the procedure at several pressure points
This integrated approach reduces the amount of external equipment required for the calibration.
Digital Pressure Gauge Calibration
The Additel ADT 780 Pressure Controller is also suitable for calibrating digital pressure gauges.
The controller generates and stabilizes the required reference pressure while the indication of the device under test is compared with the ADT 780 reference measurement.
Typical calibration sequences include increasing and decreasing pressure points to evaluate:
- Indication error
- Repeatability
- Hysteresis
- Zero behavior
Pressure Sensor Calibration
Industrial pressure sensors and transducers can also be calibrated using the ADT 780.
The modular pressure sensor architecture allows the reference range to be selected according to the pressure range of the device under test.
This is especially useful for laboratories handling many different sensor ranges.
Large 7-Inch Touchscreen
The ADT 780 uses a large:
7-inch color touchscreen
with an icon-based user interface.
The touchscreen provides access to pressure measurement, control and process calibration functions.
The large display makes the controller suitable for stationary laboratory operation and automated calibration workstations.
Wide Selection of Pressure Units
The ADT 780 supports numerous pressure units, including:
- Pa
- hPa
- kPa
- MPa
- bar
- mbar
- psi
- mmHg
- cmHg
- mHg
- inHg
- inH₂O
- mmH₂O
- cmH₂O
- kg/cm²
- torr
- mtorr
- atm
User-selectable units simplify operation when calibrating instruments with different engineering units.
Technical Highlights
Model: Additel ADT 780
Device type: Automatic Pneumatic Pressure Controller
Available base ranges: 1K and 3K
ADT 780-1K range: -0.95 to 70 bar
ADT 780-3K range: -0.95 to 200 bar
Pressure types: Gauge and Absolute
Standard accuracy: 0.02 % FS
High-accuracy modules: Available
Control stability: 0.003 % FS
Resolution: 4, 5, 6 or 7 digits depending on module
Internal pressure modules: 1
External pressure modules: 1
Built-in barometric sensor: Yes
Pressure medium: Clean gas
Optional electric pump: Yes, ADT 780-1K
Standalone pressure generation: Up to 70 bar with optional electric pump
Current measurement: Yes
Voltage measurement: Yes
mV measurement: Yes
24 V loop power: Yes
Pressure switch test: Yes
HART: Yes
PROFIBUS PA: Yes
Display: 7-inch color touchscreen
Warm-up time: 15 minutes
Technical Data
| Feature | ADT 780-1K | ADT 780-3K |
|---|---|---|
| Maximum pressure | 1,000 psi | 3,000 psi |
| Maximum pressure | 70 bar | 200 bar |
| Minimum pressure | -0.95 bar | -0.95 bar |
| Pressure types | Gauge / Absolute | Gauge / Absolute |
| Standard accuracy | 0.02 % FS | 0.02 % FS |
| High-accuracy modules | Available | Available |
| Control stability | 0.003 % FS | 0.003 % FS |
| Resolution | 4–7 digits | 4–7 digits |
| Internal pressure module | 1 | 1 |
| External pressure module | 1 | 1 |
| Built-in barometer | Yes | Yes |
| Pressure medium | Clean gas | Clean gas |
| Minimum control pressure | 0.0001 psi* | 0.001 psi* |
| Optional electric pump | Yes | External HP supply required for full range |
| Maximum standalone pump range | 70 bar | — |
| Warm-up time | 15 min | 15 min |
*Dependent on the installed pressure module.
ADT 780 vs. ADT 780S
Additel offered the ADT780 platform in two main versions:
ADT 780
and:
ADT 780S
The ADT 780 provides the full process calibration functionality, including electrical measurement and digital process communication.
The ADT 780S is the simplified controller version without the electrical measurement connections and associated process calibration functions.
For pressure transmitter calibration requiring mA measurement, loop power, HART or PROFIBUS PA communication, the ADT 780 is therefore the appropriate configuration.
ADT 780 vs. ADT 783
The ADT 780 and the newer ADT783 are both automated pneumatic pressure controllers, but they belong to different generations of Additel pressure controller technology.
The ADT 780 provides maximum base ranges of:
70 bar
and:
200 bar
The newer ADT783 platform extends the available pneumatic pressure range significantly, with configurations reaching:
420 bar / 6,000 psi
The ADT783 also introduces the newer ADT151 quick-change pressure module architecture and improved pressure control performance.
The ADT 780 remains particularly notable for its integrated process calibration functionality and its optional electric pump, which enables standalone pressure generation up to 70 bar.
Typical Applications
The Additel ADT 780 Pressure Controller is suitable for:
- Digital pressure gauge calibration
- Analog pressure gauge calibration
- Pressure transmitter calibration
- Pressure sensor calibration
- Pressure transducer calibration
- Pressure switch testing
- HART transmitter calibration
- PROFIBUS PA instrumentation
- 4–20 mA transmitter calibration
- Gauge pressure calibration
- Absolute pressure calibration
- Automated multipoint calibration
- Laboratory pressure calibration
- Production pressure testing
- Quality assurance
Typical users include:
- Professional calibration laboratories
- ISO/IEC 17025 calibration laboratories
- Industrial calibration departments
- Process instrumentation departments
- Instrument manufacturers
- Pressure sensor manufacturers
- Research laboratories
- Quality assurance departments
- Production test facilities
Calibration and Service by europascal
Reliable pressure calibration requires not only a stable pressure controller but also appropriately calibrated reference pressure modules.
The internal and external pressure modules used with the ADT 780 should therefore be included in the laboratory’s calibration and traceability concept.
The built-in barometric reference is also relevant when the absolute pressure function is used.
The europascal calibration service provides professional calibration solutions for pressure controllers, pressure modules, digital pressure gauges, pressure transmitters, sensors and other pressure measuring equipment.
europascal can support users of existing ADT 780 systems with calibration requirements and can also advise on suitable current pressure controller solutions.
Why Choose the Additel ADT 780?
The Additel ADT 780 Precise Pressure Controller combines automatic pneumatic pressure control, modular pressure measurement and extensive process calibration functionality in one benchtop system.
With base ranges extending to 70 bar or 200 bar, 0.003 % FS control stability, interchangeable pressure modules and gauge/absolute pressure capability, the ADT 780 covers a broad spectrum of professional pressure calibration applications.
The full ADT 780 additionally integrates current and voltage measurement, 24 V loop power, pressure switch testing, HART and PROFIBUS PA communication.
For the ADT 780-1K, the optional electric pump is a particularly useful feature, allowing automatic pressure generation up to 70 bar without an external gas cylinder.
These capabilities make the ADT 780 a versatile solution for existing calibration laboratories, process calibration systems and automated pressure measurement applications.
Need calibration, service or a suitable replacement for an existing Additel ADT 780? Contact europascal for professional advice on pressure calibration, pressure modules and current automated pressure controller solutions.
Further pressure controllers and calibrators from europascal can be found here.
Professional pressure calibration services from europascal can be found here.
Current pressure controller solutions can be found on the official Additel website.
