The Additel ADT 761A-500 Automatic Pressure Calibrator is a portable, fully automated pneumatic pressure calibration system designed for professional laboratory and field applications. It combines automatic pressure generation, precision pressure measurement, closed-loop pressure control, electrical process calibration and advanced communication functions in one compact instrument.
The ADT 761A-500 automatically generates and controls pressure from vacuum up to:
500 psig
or:
35 bar(g)
Its operating range extends from approximately:
-13 to 500 psig
or:
-0.9 to 35 bar(g)
An integrated barometric reference enables the ADT 761A-500 to operate with both:
Gauge Pressure
and:
Absolute Pressure
Depending on the selected internal pressure module, pressure accuracy of:
0.01 % FS
or:
0.02 % FS
is available.
Pressure control stability is specified as:
0.003 % FS
The ADT 761A-500 can accommodate two removable internal pressure modules, allowing the instrument to combine its 500 psi high-pressure capability with a second lower-range module. This is particularly useful when devices with significantly different measuring ranges need to be calibrated with the same automatic pressure calibrator.
In addition to pressure generation and measurement, the ADT761A platform provides electrical process functions, 24 V loop power, pressure switch testing, HART and PROFIBUS PA communication, task documentation and integrated data logging.
The europascal calibration service provides professional calibration solutions for automatic pressure calibrators, pressure controllers, pressure modules, digital pressure gauges, pressure transmitters and pressure sensors.
Your Benefits at a Glance
The Additel ADT 761A-500 Automatic Pressure Calibrator provides:
- Fully automatic pneumatic pressure generation
- Integrated electric pressure pump
- Pressure generation from vacuum to 35 bar
- Maximum positive pressure of 500 psig
- Gauge pressure measurement
- Absolute pressure measurement
- Integrated barometric reference
- Pressure accuracy of 0.01 % FS or 0.02 % FS
- Pressure control stability of 0.003 % FS
- Two removable internal pressure modules
- Configurable lower-range internal module
- Two external pressure module connections
- Automatic closed-loop pressure control
- Electrical process measurement
- mA and voltage measurement
- mA source and simulation
- 24 V loop power
- Pressure switch testing
- HART communication
- PROFIBUS PA communication
- Task documentation
- Integrated data logging
- Wi-Fi
- Bluetooth
- USB
- Ethernet
- Rechargeable battery
- Suitable for laboratory and field calibration
Automatic Pressure Generation up to 35 bar
The Additel ADT 761A-500 automatically generates pneumatic pressure from vacuum conditions up to:
35 bar(g)
or:
500 psig
The integrated electric pump means that an external hand pump is not required for normal pressure generation within the instrument’s operating range.
The operator enters the required pressure setpoint and the ADT 761A-500 automatically generates, adjusts and stabilizes the pressure.
This replaces many of the components traditionally required for a pneumatic calibration setup, such as:
- Manual pressure pump
- Precision reference pressure gauge
- Fine adjustment valve
- Separate pressure controller
- Electrical process calibrator
- Loop power supply
- Communication device
The result is a compact automatic calibration platform that can be used both in a calibration laboratory and directly in the field.
Pressure Range from Vacuum to 500 psi
The ADT 761A-500 covers approximately:
-13 to 500 psig
corresponding to:
-0.9 to 35 bar(g)
The negative pressure capability allows the calibrator to generate vacuum relative to atmospheric pressure.
Positive pneumatic pressure can be generated automatically up to 35 bar.
This range makes the ADT 761A-500 particularly useful for common industrial pressure transmitters, pressure gauges, sensors and switches.
Gauge Pressure Measurement
The Additel ADT 761A-500 supports gauge pressure measurement.
Gauge pressure is referenced to the surrounding atmospheric pressure.
The relationship can be expressed as:
p_gauge = p_absolute – p_atmosphere
Gauge pressure is widely used in industrial applications and is typical for:
- Pressure gauges
- Process pressure transmitters
- Pressure switches
- Pneumatic pressure sensors
- Industrial pressure transducers
Absolute Pressure Measurement
The ADT 761A-500 also supports:
Absolute Pressure
Absolute pressure is referenced to an ideal vacuum.
The relationship between gauge and absolute pressure is approximately:
p_absolute = p_gauge + p_atmosphere
Because atmospheric pressure changes continuously, an accurate barometric reference is required when converting gauge pressure into absolute pressure.
The ADT 761A-500 provides this reference internally.
Integrated Barometric Reference
A built-in barometer allows the Additel ADT 761A-500 to support absolute pressure measurements without requiring a separate external barometer.
Additel specifies a barometric accuracy contribution of:
55 Pa
When the calibrator is used in absolute pressure mode, this additional uncertainty contribution must be considered together with the accuracy specification of the selected gauge pressure module.
This is particularly important when calculating a complete measurement uncertainty budget for an absolute pressure calibration.
Accuracy Down to 0.01 % FS
Depending on the selected pressure module, the Additel ADT 761A-500 provides pressure accuracy of:
0.01 % FS
or:
0.02 % FS
FS refers to the span of the respective pressure module.
Additel specifies this as a one-year accuracy including one-year stability.
The specification is based on gauge pressure measurement. When measuring absolute pressure, the additional contribution from the integrated barometric reference must be included.
0.003 % FS Pressure Control Stability
The pressure control stability of the ADT 761A-500 is specified as:
0.003 % FS
This high control stability is particularly valuable for automatic calibration procedures.
Once the required pressure setpoint has been approached, the controller maintains a stable reference pressure so that the indication or output signal of the device under test can be evaluated under controlled conditions.
Two Removable Internal Pressure Modules
The Additel ADT 761A-500 can accommodate:
two removable internal pressure modules
This is an important advantage when the calibrator is used over a wide range of pressures.
The high-range module covers pressures up to 500 psi / 35 bar, while a second internal pressure module can be selected for a lower pressure range.
This allows the pressure measurement capability to be optimized for the actual device under test.
Why Two Pressure Ranges Matter
Pressure module accuracy is specified relative to the full span of the installed module.
For this reason, using a 35 bar module to calibrate an instrument with a significantly smaller pressure range may not always provide the optimum absolute measurement performance.
A second lower-range internal module can provide a better match to lower-pressure devices.
For example, the same ADT 761A-500 can be configured to cover a high-pressure instrument and a significantly lower-range transmitter without relying exclusively on the 500 psi module.
This modular concept makes the ADT761A particularly attractive for professional calibration laboratories.
Two External Pressure Modules
In addition to the two internal pressure module positions, the ADT761A platform provides connections for:
two external pressure modules
Compatible Additel intelligent digital pressure modules can therefore be connected to expand the measurement capabilities of the calibrator.
External modules are particularly useful when additional pressure ranges or pressure types are required.
They extend the measurement capability of the calibration system but do not increase the automatic pressure-generation range of the internal pneumatic pump.
Electrical Process Calibration
The Additel ADT 761A-500 combines pressure calibration with integrated electrical process functions.
This is especially useful for calibrating pressure transmitters.
A typical industrial pressure transmitter converts pressure into an electrical:
4–20 mA
signal.
The ADT 761A-500 can automatically generate the required reference pressure while simultaneously measuring the electrical output of the transmitter.
This allows pressure and electrical measurements to be performed within one calibration workflow.
mA and Voltage Measurement
The electrical process section provides measurement of:
- Current
- Voltage
These functions allow pressure transmitters and other process instruments with electrical outputs to be tested directly.
This reduces the amount of additional equipment required for many field calibration applications.
mA Source and Simulation
The ADT761A platform can also source or simulate current.
This expands the instrument beyond pressure generation and allows it to perform additional process calibration tasks.
Combining pressure and electrical functionality in one instrument can simplify calibration setups and reduce the number of separate instruments required in the field.
24 V Loop Power
The Additel ADT 761A-500 provides:
24 V loop power
for compatible process transmitters.
This is particularly useful for two-wire 4–20 mA pressure transmitters.
The calibrator can therefore provide the pressure stimulus, supply the transmitter and measure its electrical output within one integrated calibration setup.
Pressure Switch Testing
The ADT 761A-500 supports:
Pressure Switch Testing
The automatic pressure controller can increase and decrease the applied pressure while the instrument monitors the switching state.
This allows important parameters to be determined, including:
- Switching pressure
- Reset pressure
- Pressure switch hysteresis
Automatic pressure generation provides a convenient alternative to manually approaching the switching point with a hand pump.
HART Communication
The Additel ADT 761A-500 supports:
HART communication
for compatible smart field devices.
HART capability allows intelligent pressure transmitters to be incorporated into the calibration workflow.
Depending on the connected device and application, HART communication can support functions such as:
- Device identification
- Reading digital process values
- Configuration
- Diagnostics
- Calibration support
PROFIBUS PA Communication
The ADT761A platform also supports:
PROFIBUS PA
communication.
This provides additional flexibility for modern digital process instrumentation.
Combined with automatic pressure generation and electrical measurement, the communication functions make the ADT 761A-500 a comprehensive process pressure calibration platform.
Automated Calibration Tasks
The Additel ADT 761A-500 supports task documentation and automated calibration workflows.
A predefined calibration sequence can include several increasing and decreasing pressure points.
The instrument can automatically approach the required pressure setpoints and support the recording of the resulting measurement data.
This is particularly useful for repetitive calibration procedures.
Integrated Data Logging
The ADT761A provides integrated:
Data Logging
Measurement values can be recorded directly with the calibrator.
Typical applications include:
- Pressure stability tests
- Long-term measurements
- Calibration documentation
- Process monitoring
- Troubleshooting
- Instrument evaluation
Integrated logging can reduce the need for separate data acquisition equipment in many applications.
Wi-Fi, Bluetooth, USB and Ethernet
The Additel ADT 761A-500 provides modern communication interfaces including:
- Wi-Fi
- Bluetooth
- USB
- Ethernet
These interfaces facilitate integration into digital calibration environments and communication with computers and compatible equipment.
The combination of wired and wireless interfaces makes the ADT761A suitable for both laboratory and mobile field use.
Portable Automated Calibration
The ADT 761A-500 combines automatic pressure generation up to 35 bar with a portable design.
This is particularly useful when the device under test cannot easily be removed from an industrial installation.
Instead of transporting the instrument to a stationary pressure controller, the automatic calibration system can be taken to the measurement location.
The rechargeable battery further supports mobile calibration applications.
Technical Highlights
Model: Additel ADT 761A-500
Device type: Automatic Pneumatic Pressure Calibrator
Pressure range: -13 to 500 psig
Pressure range: Approx. -0.9 to 35 bar(g)
Maximum positive pressure: 500 psi / 35 bar
Pressure types: Gauge and Absolute
Barometric reference: Integrated
Pressure accuracy: 0.01 % FS or 0.02 % FS depending on module
Barometric accuracy contribution: 55 Pa
Pressure control stability: 0.003 % FS
Internal pressure modules: 2
Internal modules: Removable
External pressure modules: 2
Pressure generation: Integrated electric pump
Pressure control: Fully automatic
Electrical process functions: Yes
mA measurement: Yes
Voltage measurement: Yes
mA source/simulation: Yes
24 V loop power: Yes
Pressure switch testing: Yes
HART communication: Yes
PROFIBUS PA communication: Yes
Task documentation: Yes
Data logging: Yes
Wi-Fi: Yes
Bluetooth: Yes
USB: Yes
Ethernet: Yes
Technical Data
| Feature | Additel ADT 761A-500 |
|---|---|
| Device type | Automatic Pneumatic Pressure Calibrator |
| Pressure range | -13 to 500 psig |
| Pressure range | Approx. -0.9 to 35 bar(g) |
| Maximum positive pressure | 500 psi / 35 bar |
| Pressure types | Gauge / Absolute |
| Barometric reference | Integrated |
| Accuracy | 0.01 % FS or 0.02 % FS |
| Additional absolute-mode contribution | 55 Pa |
| Control stability | 0.003 % FS |
| Internal pressure modules | 2 |
| Internal modules removable | Yes |
| External pressure modules | 2 |
| Automatic pressure generation | Yes |
| Integrated electric pump | Yes |
| Electrical process calibration | Yes |
| mA / V measurement | Yes |
| mA source/simulation | Yes |
| 24 V loop power | Yes |
| Pressure switch test | Yes |
| HART | Yes |
| PROFIBUS PA | Yes |
| Task documentation | Yes |
| Data logging | Yes |
| Wi-Fi | Yes |
| Bluetooth | Yes |
| USB | Yes |
| Ethernet | Yes |
ADT 761A-500 vs. ADT 761A-1K and ADT 761A-1.5K
The ADT761A series provides several configurations for medium and higher pneumatic pressures.
| Model | Pressure Range | Pressure Type | Control Stability |
|---|---|---|---|
| ADT 761A-500 | -0.9 to 35 bar | Gauge / Absolute | 0.003 % FS |
| ADT 761A-1K | -0.9 to 70 bar | Gauge / Absolute | 0.003 % FS |
| ADT 761A-1.5K | -0.9 to 100 bar | Gauge / Absolute | 0.003 % FS |
The ADT 761A-500 is the 35 bar configuration and is therefore particularly suitable when the application does not require the extended 70 bar or 100 bar pressure capability of the larger models.
Selecting a pressure range that is appropriately matched to the intended application can be advantageous from a metrological perspective.
The ADT 761A-1K extends automatic pneumatic pressure generation to 70 bar.
The ADT 761A-1.5K provides the highest pressure capability in this group at 100 bar.
ADT 761A-500 vs. ADT 760A-MA
The ADT 760A-MA and ADT 761A-500 both provide automatic gauge and absolute pressure calibration.
The ADT 760A-MA covers pressures up to approximately:
25 bar
The ADT 761A-500 extends the automatic pneumatic pressure range to:
35 bar
The ADT761A platform also provides two removable internal pressure module positions, allowing the calibrator to combine its high-pressure capability with a lower-range internal module.
This makes the ADT 761A-500 particularly attractive for professional users who require flexible multi-range automatic calibration.
Typical Calibration Applications
The Additel ADT 761A-500 Automatic Pressure Calibrator is particularly suitable for calibration and testing of:
- Digital pressure gauges
- Analog pressure gauges
- Gauge pressure transmitters
- Absolute pressure transmitters
- Pressure sensors
- Pressure transducers
- Pressure switches
- 4–20 mA pressure transmitters
- HART pressure transmitters
- PROFIBUS PA process instruments
- Pneumatic process instrumentation
- Industrial pressure measuring equipment
Typical users include:
- Professional calibration laboratories
- Industrial maintenance departments
- Process industry
- Chemical industry
- Pharmaceutical industry
- Energy and power generation
- Instrument manufacturers
- Quality assurance departments
- Mobile field service
Calibration and Service by europascal
Regular calibration of the ADT 761A-500 is important for maintaining reliable metrological performance.
When two internal pressure modules are installed, both modules should be considered when defining the required calibration scope.
For absolute pressure applications, the integrated barometric reference must also be taken into account.
The europascal calibration service provides professional calibration solutions for automatic pressure calibrators, pressure controllers, pressure modules, digital pressure gauges, pressure transmitters and pressure sensors.
europascal can also support customers in selecting the appropriate ADT 761A configuration, internal pressure modules, external pressure modules and accessories.
Why Choose the Additel ADT 761A-500?
The Additel ADT 761A-500 Precise Automatic Pressure Calibrator combines fully automatic pneumatic pressure generation from vacuum up to 500 psi / 35 bar, pressure accuracy down to 0.01 % FS and excellent 0.003 % FS pressure control stability.
Its two removable internal pressure modules allow the system to be configured for both high and lower pressure ranges, helping to optimize measurement performance across different calibration applications.
An integrated barometric reference enables both gauge and absolute pressure measurement, while two external pressure module connections provide additional flexibility.
Integrated electrical process calibration, mA sourcing, 24 V loop power, pressure switch testing, HART and PROFIBUS PA communication, task documentation and data logging make the ADT 761A-500 a comprehensive solution for professional automated pressure calibration.
Looking for the Additel ADT 761A-500 for automatic pneumatic pressure calibration up to 35 bar? Contact europascal for expert advice, suitable pressure module configurations, accessories and professional calibration services.
Further information about the Additel ADT 761A series from europascal can be found here.
Further pressure calibration products from europascal can be found here.
