Additel ADT 920 is a powerful pneumatic high pressure test pump designed for professional pressure calibration from 95% vacuum to 3,000 psi / 200 bar. The manually operated pressure pump combines an exceptionally high pneumatic pressure range with precise fine adjustment, excellent stability and convenient hand-tight connections. This makes the Additel ADT 920 an ideal pressure source for calibrating pressure gauges, pressure transmitters, pressure sensors, pressure switches and other pressure measuring instruments.

One of the most important advantages of the Additel ADT 920 is its ability to generate pressures up to 200 bar using air. This allows many high-pressure instruments to be calibrated pneumatically instead of using hydraulic oil. A long operating lever enables the pump to generate its maximum pressure of 3,000 psi / 200 bar in approximately 40 seconds.

A high-quality screw press provides fine pressure adjustment with a resolution down to 10 Pa / 0.1 mbar. A specially designed shut-off valve helps maintain stable pressure during calibration. The integrated gas-liquid isolator protects the internal pump mechanism against moisture and contamination introduced by devices under test.

Two hand-tight quick connectors allow a reference pressure instrument and device under test to be connected directly to the pump without conventional wrenches or PTFE tape when compatible connections are used.

At europascal, the Additel ADT 920 complements a comprehensive range of professional pressure generation and calibration equipment. In addition to supplying high-quality calibration technology, europascal provides accredited calibration services for pressure and other measurement quantities. Find more information about calibration and metrological traceability at the europascal Calibration Service.

Your Benefits at a Glance

The Additel ADT 920 combines pneumatic high-pressure generation, precise adjustment and completely manual operation in one professional pressure source.

Key advantages include:

• Pressure generation from 95% vacuum to 3,000 psi / 200 bar
• Pneumatic operation with air as pressure medium
• Generates 3,000 psi / 200 bar in approximately 40 seconds
• Fine adjustment down to 10 Pa / 0.1 mbar
• Vacuum and positive pressure generation with one pump
• Completely manual operation
• No electrical power required
• No external compressed-air supply required
• Long lever for efficient pressure generation
• High-quality screw press for fine adjustment
• Special shut-off valve for excellent pressure stability
• Integrated gas-liquid isolator
• Protection against moisture and contamination
• Two hand-tight quick connectors
• Simultaneous connection of reference and test instrument
• No PTFE tape or conventional wrenches required for compatible connections
• Different NPT, BSP and M20 × 1.5 pressure connections available
• Stainless steel and aluminum construction
• ADT 920HV high-volume version available
• Oil-free configuration available by special order
• Ideal for laboratory and field pressure calibration

Pneumatic High Pressure Generation up to 200 bar

The Additel ADT 920 provides an exceptionally high pressure range for a manually operated pneumatic calibration pump.

Its pressure generation range extends from:

95% vacuum

to:

3,000 psi / 200 bar positive pressure.

This broad range enables one pressure pump to cover vacuum, low-pressure, medium-pressure and demanding pneumatic high-pressure applications.

The ability to generate pressures up to 200 bar using air is particularly important for instruments that should not be exposed to hydraulic oil.

Typical devices under test include:

• Analog pressure gauges
• Digital pressure gauges
• Gas pressure gauges
• Vacuum gauges
• Compound pressure gauges
• Pressure transmitters
• Pressure sensors
• Pressure switches
• Pneumatic process instruments
• Precision pressure indicators

For calibration laboratories working with a wide range of pneumatic pressure instruments, the ADT 920 can significantly reduce the number of different pressure generation systems required.

200 bar in Approximately 40 Seconds

Manual generation of high gas pressures can be time-consuming with conventional pneumatic pumps.

The Additel ADT 920 addresses this challenge with a long operating lever and efficient pressure generation mechanism.

According to Additel, the pump can generate:

3,000 psi / 200 bar in approximately 40 seconds.

This high efficiency makes the ADT 920 particularly useful when high pneumatic pressures need to be generated regularly.

Once the approximate pressure has been generated, the integrated screw press allows the operator to approach the desired calibration point precisely.

Fine Adjustment Down to 10 Pa

Professional pressure calibration requires more than simply generating pressure.

The pressure must also be accurately adjusted to the required calibration point.

The Additel ADT 920 therefore incorporates a high-quality screw press for precise pressure adjustment.

The specified adjustment resolution is:

10 Pa

or:

0.1 mbar.

The operator first generates the approximate pressure using the hand pump.

The screw press is then used to finely increase or decrease the pressure until the desired calibration point is reached.

This combination of efficient pressure generation and precise adjustment makes the ADT 920 suitable for use with high-resolution reference pressure instruments.

Excellent Pressure Stability

Pressure stability is essential when comparing a device under test with a reference pressure instrument.

The Additel ADT 920 incorporates a specially designed shut-off valve that helps make the generated pressure as stable as possible during calibration.

Stable conditions are especially important when calibrating:

• High-resolution digital pressure gauges
• Precision pressure references
• Pressure transmitters
• Pressure sensors
• Pressure switches

After reaching the desired calibration pressure, sufficient stabilization time should be allowed before recording measurement values.

Air as Pressure Medium

The Additel ADT 920 uses:

air

as its pressure medium.

This is a major advantage for pressure instruments that must remain free from hydraulic oil.

At pressures approaching 200 bar, hydraulic pumps are commonly used because liquids are easier to pressurize than gases. However, hydraulic fluid can contaminate pneumatic pressure instruments.

The ADT 920 provides an alternative by generating pressures up to 200 bar pneumatically.

For applications requiring a dedicated oil-free configuration, Additel recommends contacting the manufacturer for the appropriate special-order version.

Vacuum Generation up to 95%

Despite its high positive pressure capability, the Additel ADT 920 can also generate:

95% vacuum.

This enables the same pump to be used for vacuum, compound and positive-pressure instruments.

Typical vacuum applications include:

• Vacuum gauges
• Compound pressure gauges
• Vacuum transmitters
• Vacuum switches
• Pressure sensors

The combination of vacuum generation and positive pressure up to 200 bar provides exceptional flexibility for professional pressure calibration.

Integrated Gas-Liquid Isolator

Devices under test can introduce moisture or contamination into a pneumatic calibration system.

The Additel ADT 920 therefore incorporates a built-in gas-liquid isolator.

The isolator helps protect the internal pump mechanism from moisture and dirt.

Residual liquid introduced by devices under test is collected and can be pushed out during pressure release.

This reduces contamination of the internal pneumatic system and helps minimize maintenance requirements.

For calibration laboratories processing instruments from different industrial environments, this provides an important practical advantage.

Hand-Tight Quick Connectors

The Additel ADT 920 incorporates two hand-tight quick connectors.

One connection is used for the:

reference pressure instrument

and the second for the:

device under test.

Compatible instruments can be connected and disconnected without PTFE tape or conventional wrenches.

This simplifies instrument changes and can considerably reduce setup time during routine calibration.

The hand-tight connection concept is particularly useful in calibration laboratories where multiple devices are tested every day.

Different Pressure Connection Options

The Additel ADT 920 is available with several pressure port configurations.

Available options include:

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

This enables the pump to be configured for common international pressure connection standards.

Additional Additel adapter and fitting sets are available for devices with different pressure connections.

Professional Comparison Calibration

The Additel ADT 920 is designed as a professional comparison pressure test pump.

A typical calibration setup consists of:

Additel ADT 920 + Reference Pressure Instrument + Device Under Test

The reference instrument and device under test are connected simultaneously to the two pressure ports.

The ADT 920 generates the required pressure.

The operator uses the fine adjustment screw to precisely approach the desired calibration point.

After sufficient stabilization, the indication of the device under test is compared with the traceable reference pressure.

This procedure can be repeated at several increasing and decreasing pressure points according to the applicable calibration procedure.

Pressure Gauge Calibration

The Additel ADT 920 is particularly suitable for pneumatic pressure gauge calibration.

Typical devices include:

• Mechanical pressure gauges
• Digital pressure gauges
• Gas pressure gauges
• Vacuum gauges
• Compound pressure gauges
• Precision pressure indicators

The ADT 920 generates the required pressure but does not itself provide the traceable reference pressure value.

It is therefore combined with a suitable reference pressure gauge, pressure calibrator or pressure module.

The achievable measurement uncertainty depends on the reference standard, environmental conditions, pressure stability, calibration procedure and the complete measurement uncertainty budget.

Pressure Transmitter Calibration

The Additel ADT 920 can also provide the pneumatic pressure source required for pressure transmitter calibration.

The pump generates the required input pressure while a suitable reference instrument measures the actual applied pressure.

The electrical output of the transmitter can simultaneously be measured using an appropriate process calibrator or precision multimeter.

For many industrial pressure transmitters, the standard output signal is:

4 to 20 mA.

Several increasing and decreasing pressure points can be generated to evaluate the relationship between applied pressure and electrical output.

Pressure Switch Testing

The Additel ADT 920 can also be used as the pressure source for testing pressure switches.

Pressure is gradually increased until the switch changes state.

The pressure can then be reduced until the switch resets.

Combined with a suitable reference pressure instrument and electrical switch detector, this allows determination of:

• Switching pressure
• Reset pressure
• Switching hysteresis

The fine adjustment mechanism helps the operator accurately approach the switching point.

Additel ADT 920HV High Volume Version

In addition to the standard ADT 920, Additel offers the:

Additel ADT 920HV.

The HV designation stands for a high-volume version designed to provide additional pressure generation capacity.

The standard Additel ADT 920 has a piston volume of:

60 ml.

The Additel ADT 920HV increases the piston volume to:

115 ml.

This increased volume can be advantageous when calibrating instruments or systems with larger internal volumes.

Both versions cover the same basic pressure range from 95% vacuum to 3,000 psi / 200 bar and provide the same fine adjustment resolution of 10 Pa / 0.1 mbar.

Robust Construction

The Additel ADT 920 is designed for demanding professional calibration applications.

The ram and adapters are manufactured from:

stainless steel.

The body combines:

stainless steel and aluminum.

Seal materials include:

Buna-N, F357, PTFE and copper alloy.

Anticorrosive and wear-resistant materials are used to improve reliability and service life.

Technical Highlights

Safety and Operating Range

The normal operating range of the Additel ADT 920 extends to:

3,000 psi / 200 bar.

According to the manufacturer’s operating instructions, the overpressure safety limit is:

3,500 psi / 235 bar.

This safety limit must not be interpreted as an extended calibration or operating range.

Normal operation should remain within the specified 200 bar generated pressure range.

Additel also specifies that pressure above 1,000 psi should not be held for more than four hours.

The pressure and vacuum mode must not be switched while the system is pressurized.

Additel ADT 920 vs. Additel ADT 919A

The Additel ADT 920 extends the pneumatic pressure capability beyond the Additel ADT 919A.

The Additel ADT 919A provides positive pressure generation up to:

2,000 psi / 140 bar.

The Additel ADT 920 extends the maximum positive pressure to:

3,000 psi / 200 bar.

The ADT 920 reaches its maximum pressure in approximately 40 seconds while maintaining fine adjustment down to 10 Pa / 0.1 mbar.

The ADT 920 is therefore particularly suitable for users who need pneumatic calibration pressures above 140 bar while continuing to use air instead of hydraulic fluid.

Typical Applications

The Additel ADT 920 is suitable for:

• Pneumatic high-pressure calibration
• Pressure gauge calibration
• Digital pressure gauge calibration
• Gas pressure gauge calibration
• Vacuum calibration
• Compound pressure gauge calibration
• Pressure transmitter calibration
• Pressure sensor testing
• Pressure switch testing
• Comparison pressure calibration
• Laboratory calibration
• Field calibration
• Industrial maintenance
• Service applications
• Pneumatic test systems
• Research and development

Why Choose the Additel ADT 920?

The Additel ADT 920 provides an exceptional combination of pneumatic high-pressure generation, precise adjustment and independent manual operation.

Its range from 95% vacuum to 3,000 psi / 200 bar allows a single manual pressure pump to cover a broad variety of pneumatic calibration tasks.

The long operating lever enables the maximum pressure of 200 bar to be generated in approximately 40 seconds, while the high-quality screw press provides fine adjustment down to 10 Pa / 0.1 mbar.

A specially designed shut-off valve supports excellent pressure stability during calibration.

The integrated gas-liquid isolator protects the pump against moisture and contamination from connected devices under test.

Two hand-tight quick connectors simplify the installation of the reference pressure instrument and device under test without requiring PTFE tape or conventional wrenches.

For applications involving larger system volumes, the Additel ADT 920HV provides an increased piston volume of 115 ml compared with 60 ml for the standard ADT 920.

Most importantly, the ADT 920 reaches pressures that would normally be associated with hydraulic pressure generation while continuing to use air as its pressure medium.

At europascal, we provide Additel pressure generation and calibration technology for professional laboratory, industrial and field applications. Our portfolio includes pneumatic and hydraulic pressure pumps, digital pressure gauges, pressure calibrators, pressure modules and automated pressure calibration systems.

For professional calibration and metrological traceability of pressure measuring instruments, visit the europascal Calibration Service.

Further Additel products are available from europascal.

Manufacturer information about the Additel ADT 920 is available on the official Additel website.

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