The Additel ADT 773-D Differential Pressure Controller is a high-performance automatic pneumatic pressure controller and generator designed for precise differential pressure calibration in professional laboratories, production environments and automated test systems. Combining an integrated pneumatic pressure pump, two interchangeable ADT151 reference pressure modules, fast pressure generation and highly stable control, the ADT 773-D provides a powerful solution for demanding differential pressure applications.
In its current configuration, the ADT 773-D can cover pressure ranges up to:
-1 to +7 bar
or:
-400 to +2,800 inH₂O
depending on the installed ADT151 differential pressure module.
Unlike conventional pressure controllers that require a continuous external pressure source, the ADT 773-D incorporates Additel’s automatic pneumatic pressure-generation technology. This makes the instrument both a:
Pressure Controller
and:
Pressure Generator
for low and differential pressure applications.
Pressure control stability is specified at:
<0.003 % FS
and the ADT773 platform provides settling times of:
<10 seconds
under Additel’s specified test conditions.
With suitable ADT151 modules, measurement accuracy is available down to:
0.01 % FS
while precision can reach:
0.004 % FS
This combination of automatic pressure generation, fast control and high-quality reference measurement makes the ADT 773-D particularly suitable for automated differential pressure calibration.
For professional calibration and metrological traceability of pressure controllers, differential pressure transmitters, gauges and sensors, visit the europascal calibration service.
Your Benefits at a Glance
The Additel ADT 773-D Differential Pressure Controller provides:
- Automatic pneumatic pressure generation
- Integrated differential pressure pump
- Differential pressure ranges up to +7 bar
- Maximum module range from -1 to +7 bar
- Measurement accuracy down to 0.01 % FS
- Precision down to 0.004 % FS
- Pressure control stability <0.003 % FS
- Fast settling time below 10 seconds
- Two interchangeable internal ADT151 pressure modules
- Automatic or fixed range selection
- Fast, Standard and Custom control modes
- Maximum overshoot <1 % FS
- Optional barometric reference module
- Optional Contamination Prevention System
- Three external valve control channels
- Mechanical and electronic pressure switch testing
- Large 7-inch capacitive touchscreen
- 1280 × 800 pixel display resolution
- RS232, USB and LAN interfaces
- Optional WiFi, Bluetooth and GPIB communication
- SCPI command support
- Emulation mode for integration into existing calibration systems
- 19-inch rack installation capability
Differential Pressure Control up to 7 bar
The Additel ADT 773-D extends automatic differential pressure calibration to significantly higher pressures than conventional low-pressure controllers.
With the appropriate ADT151-DP2.8K module, the maximum measurement range reaches:
-1,000 to +7,000 mbar
or:
-1 to +7 bar
or:
-400 to +2,800 inH₂O
This makes the ADT 773-D suitable for applications ranging from relatively low differential pressure through demanding industrial differential pressure measurements.
Integrated Pneumatic Pressure Generation
One of the key advantages of the ADT 773-D is its:
built-in differential pressure pump
The integrated pneumatic system automatically generates and controls the required pressure.
This reduces the need for separate manual pressure pumps and simplifies the construction of automated calibration systems.
A typical calibration setup can therefore consist of:
ADT 773-D → Device Under Test
with suitable pressure connections and accessories.
The controller automatically generates, adjusts and stabilizes the selected pressure point.
Two Interchangeable ADT151 Modules
The Additel ADT 773-D provides two internal pressure module bays.
These accept interchangeable:
Additel ADT151 Differential Pressure Modules
The modular design allows the controller to be configured for different differential pressure ranges.
For example, a laboratory can combine a high-range module with a lower-range module to improve measurement capability across a wider calibration range.
The controller supports:
Automatic
or:
Fixed
range selection.
This means the most appropriate installed reference range can be selected for the current calibration task.
ADT151-DP2.8K for the Full 7 bar Range
The current ADT151 module portfolio includes the:
ADT151-DP2.8K
for the ADT 773-D.
Its first measurement range extends from:
-1,000 to +7,000 mbar
or:
-400 to +2,800 inH₂O
A second range extends from:
-1,000 to +3,500 mbar
or:
-400 to +1,500 inH₂O
The DP2.8K is therefore the key module when the full current pressure capability of the ADT 773-D is required.
High-Accuracy Differential Pressure Measurement
For suitable ADT151 modules used with the ADT 773-D, Additel specifies accuracy down to:
0.01 % FS
and precision down to:
0.004 % FS
For the higher-range differential modules, including DP2.8K, DP2K, DP1K and several lower ranges, Additel specifies high-performance measurement options suitable for professional calibration applications.
The exact measurement specification depends on the selected ADT151 module and configuration.
What Does the Accuracy Specification Include?
For the current ADT151 differential pressure modules, Additel defines the accuracy specification as including contributions from:
- Linearity
- Hysteresis
- Repeatability
- Resolution
- Reference standard measurement uncertainty
- Annual drift
- Temperature compensation
The stated accuracy specification uses:
k = 2
for the reference standard measurement uncertainty contribution.
Additel recommends annual calibration for most ADT151 differential pressure modules.
The smallest DP2, DP5, DP10 and DP20 ranges require particular attention to the specified calibration interval.
Pressure Control Stability <0.003 % FS
The ADT 773 provides pressure control stability of:
<0.003 % FS
Stable pressure is particularly important for differential pressure calibration because small pressure variations can become significant when testing high-resolution differential pressure instruments.
The combination of automatic pressure generation and closed-loop pressure control allows the ADT 773-D to approach and maintain calibration points automatically.
Fast Settling Time
Under Additel’s specified operating conditions, the ADT773 platform provides a typical settling time of:
<10 seconds
for the specified pressure step and stability criterion.
Fast pressure generation and stabilization can significantly reduce the overall calibration time when many pressure points must be tested.
This is especially useful for automated calibration sequences and production testing.
Three Pressure Control Modes
The ADT 773-D provides:
Fast
Standard
and:
Custom
pressure control modes.
These modes allow the control behavior to be adapted to the connected device and calibration setup.
The Custom mode can be particularly useful when sensitive instruments or unusual pneumatic volumes require specific pressure-control behavior.
Maximum Overshoot <1 % FS
Additel specifies maximum pressure overshoot of:
<1 % FS
Controlled pressure approach helps prevent unnecessary pressure excursions and is particularly useful when sensitive differential pressure sensors or transmitters are connected.
Optional Barometric Reference Module
An optional barometric pressure module can be installed in the ADT773 platform.
This provides atmospheric pressure information for applications requiring reference to absolute atmospheric pressure.
The modular architecture allows the barometric reference to be integrated without occupying the two primary ADT151 control module positions.
Pressure Switch Testing
The Additel ADT 773-D can also be used for pressure switch testing.
It supports:
- Mechanical pressure switches
- Electronic pressure switches
Automatic pressure generation allows the switching point to be approached systematically.
Both activation and reset behavior can therefore be evaluated during pressure switch calibration.
Three External Valve Control Channels
The ADT 773 provides:
three external valve control channels
One channel can be used with Additel’s optional:
Contamination Prevention System (CPS)
The other channels can be used for external equipment such as:
- Vacuum pumps
- Shut-off valves
- Additional pneumatic system components
This functionality makes the ADT 773-D particularly useful for customized automated calibration benches.
Optional Contamination Prevention System
An optional:
Contamination Prevention System
can help protect the controller against contamination introduced by devices under test.
Contaminants can include:
- Moisture
- Oil
- Particles
- Process residues
Protecting the pneumatic control system and reference modules can help maintain reliable long-term performance.
Differential Pressure Transmitter Calibration
The Additel ADT 773-D is particularly suitable for calibration of differential pressure transmitters.
Differential pressure transmitters are commonly used for:
- Flow measurement
- Filter monitoring
- Level measurement
- Process control
- Airflow measurement
- Industrial pressure measurement
The controller automatically generates stable reference pressures while the output signal of the transmitter can be evaluated using suitable electrical measurement equipment.
Flow Measurement Applications
Differential pressure is frequently used to determine flow through primary elements such as:
- Orifice plates
- Venturi tubes
- Flow nozzles
- Pitot tubes
These systems generate a differential pressure related to the flow rate.
Accurate calibration of the associated differential pressure transmitter is therefore essential for reliable flow measurement.
The ADT 773-D provides an automated reference pressure source for these calibration tasks.
Filter Monitoring and HVAC Applications
Differential pressure is also widely used for monitoring:
- Air filters
- Ventilation systems
- Cleanrooms
- Air handling systems
- Building automation systems
The pressure drop across a filter changes as contamination increases.
Accurate differential pressure measurement is therefore essential for reliable filter monitoring and maintenance.
The ADT 773-D provides a flexible calibration platform for the associated pressure instrumentation.
Automated Multipoint Calibration
A typical automated differential pressure calibration can include:
- Zero pressure
- Increasing pressure points
- Maximum calibration pressure
- Decreasing pressure points
- Return to zero
The ADT 773-D automatically generates and stabilizes each pressure point.
This can reduce operator workload and improve consistency during repetitive calibration procedures.
Large 7-Inch Touchscreen
The ADT 773 uses a:
7-inch capacitive color touchscreen
with a resolution of:
1280 × 800 pixels
The large display provides convenient access to pressure measurement, pressure control and system configuration.
The touchscreen interface makes the controller suitable for both standalone laboratory operation and integration into automated calibration workstations.
Communication and Automation
The ADT 773 provides extensive communication capabilities.
Standard interfaces include:
- RS232
- 2 × USB-A
- LAN
The system can also be expanded with communication options including:
- WiFi
- Bluetooth
- GPIB
This allows the ADT 773-D to be integrated into a wide range of automated calibration and production test systems.
SCPI Command Support
The ADT773 platform supports:
SCPI commands
for remote control.
SCPI is widely used in automated measurement and calibration systems.
This simplifies integration with calibration software, laboratory automation systems and custom test applications.
Emulation Mode
A particularly useful feature when modernizing an existing calibration system is the ADT773’s:
Emulation Mode
This functionality is designed to support command structures associated with established pressure controller platforms.
It can reduce the software integration effort when replacing an older pressure controller in an automated calibration system.
Compatibility should always be checked for the specific controller, software and command set being replaced.
Technical Highlights
Model: Additel ADT 773-D
Device type: Automatic Differential Pressure Controller / Generator
Maximum module range: -1 to +7 bar
Maximum module range: -400 to +2,800 inH₂O
Pressure type: Differential Pressure
Pressure generation: Integrated pneumatic pump
Accuracy: Down to 0.01 % FS depending on module
Precision: Down to 0.004 % FS depending on module
Control stability: <0.003 % FS
Settling time: <10 seconds under specified conditions
Internal pressure modules: 2 × ADT151
Range selection: Automatic or Fixed
Control modes: Fast, Standard, Custom
Maximum overshoot: <1 % FS
Maximum load volume: 500 ml
Barometric reference: Optional
CPS: Optional
External valve control: 3 channels
Pressure switch test: Mechanical and electronic
Display: 7-inch capacitive touchscreen
Display resolution: 1280 × 800 pixels
Standard communication: RS232, USB, LAN
Optional communication: WiFi, Bluetooth, GPIB
Remote commands: SCPI
Emulation mode: Yes
Rack mounting: 19 inch, 3U
Base unit weight: Approximately 17.6 kg
Operating temperature: 10 °C to 50 °C
Warm-up time: 15 minutes
Protection rating: IP20
Technical Data
| Feature | Additel ADT 773-D |
|---|---|
| Device type | Differential Pressure Controller / Generator |
| Maximum module range | -1 to +7 bar |
| Maximum module range | -400 to +2,800 inH₂O |
| Pressure type | Differential |
| Pressure generation | Integrated pneumatic pump |
| Accuracy | Down to 0.01 % FS |
| Precision | Down to 0.004 % FS |
| Control stability | <0.003 % FS |
| Settling time | <10 s |
| Internal modules | 2 × ADT151 |
| Range selection | Auto / Fixed |
| Control modes | Fast / Standard / Custom |
| Maximum overshoot | <1 % FS |
| Maximum load volume | 500 ml |
| Barometric module | Optional |
| CPS | Optional |
| External valve channels | 3 |
| Pressure switch test | Yes |
| Display | 7-inch touchscreen |
| Resolution | 1280 × 800 |
| Interfaces | RS232 / USB / LAN |
| Optional interfaces | WiFi / Bluetooth / GPIB |
| SCPI | Supported |
| Warm-up time | 15 min |
| Protection | IP20 |
ADT 773-D vs. ADT 773-LLP
The ADT773 platform is available in two primary configurations.
The:
ADT 773-LLP
is optimized for particularly low differential pressures.
The:
ADT 773-D
extends the pressure capability considerably and is the preferred configuration when higher differential pressures are required.
| Feature | ADT 773-LLP | ADT 773-D |
|---|---|---|
| Primary application | Very low differential pressure | Differential pressure |
| Controller range | Approx. -0.95 to +1 bar | Extended up to +7 bar with suitable module |
| Integrated pump | Yes | Yes |
| Internal ADT151 modules | 2 | 2 |
| Control stability | <0.003 % FS | <0.003 % FS |
| Fast settling | Yes | Yes |
The correct version should therefore be selected according to the required differential pressure range and measurement uncertainty.
ADT 773-D vs. ADT 783-D
Although both models are designed for differential pressure applications, their pressure-generation concepts differ.
The ADT 773-D incorporates Additel’s low-pressure pneumatic pump technology and is specifically optimized as a:
Pressure Controller / Generator
for low and differential pressure calibration.
The ADT 783-D belongs to the higher-pressure ADT783 controller platform.
For applications where integrated pressure generation, sensitive differential pressure capability and a wide selection of ADT151 DP modules are important, the ADT 773-D provides a highly specialized solution.
Typical Applications
The Additel ADT 773-D Differential Pressure Controller is suitable for:
- Differential pressure transmitter calibration
- Differential pressure gauge calibration
- Pressure sensor calibration
- Low-pressure calibration
- Flow transmitter calibration
- Filter monitoring instrumentation
- HVAC instrumentation
- Cleanroom pressure measurement
- Airflow instrumentation
- Process differential pressure measurement
- Pressure switch calibration
- Automated calibration systems
- Production testing
- Quality assurance
- Research and development
- Laboratory automation
Typical users include:
- Professional calibration laboratories
- ISO/IEC 17025 calibration laboratories
- Process industries
- HVAC calibration laboratories
- Pharmaceutical facilities
- Cleanroom operators
- Instrument manufacturers
- Pressure sensor manufacturers
- Research laboratories
- Production test facilities
Calibration and Service by europascal
High-quality differential pressure calibration requires stable pressure generation, appropriately selected reference ranges and reliable metrological traceability.
The interchangeable ADT151 modules should therefore be selected according to the pressure ranges and uncertainty requirements of the actual calibration workload.
The europascal calibration service provides professional calibration solutions for pressure controllers, differential pressure instruments, pressure modules, transmitters, sensors and pressure gauges.
europascal can also support customers in selecting the appropriate ADT 773 version, suitable ADT151 modules, contamination protection and accessories.
Why Choose the Additel ADT 773-D?
The Additel ADT 773-D Precise Differential Pressure Controller combines automatic pneumatic pressure generation with high-performance differential pressure measurement and fast closed-loop pressure control.
With suitable ADT151 modules, the current platform extends to 7 bar / 2,800 inH₂O, while providing accuracy down to 0.01 % FS, precision down to 0.004 % FS and control stability of <0.003 % FS.
Two interchangeable internal pressure modules, automatic range selection, fast settling, optional contamination protection, external valve control, SCPI communication and emulation capabilities make the ADT 773-D an excellent solution for professional calibration laboratories and automated pressure test systems.
Looking for an automated differential pressure controller with integrated pressure generation? Contact europascal for expert advice on the Additel ADT 773-D, suitable ADT151 modules, accessories and professional calibration services.
Further information about the Additel ADT 773 from europascal can be found here.
Professional pressure calibration services from europascal can be found here.
Manufacturer information about the Additel ADT 773 can be found on the official Additel website.
