Additel ADT 959A is a powerful hydraulic ultra-high pressure test pump designed for professional pressure calibration from 0 to 40,000 psi / 2,800 bar. This benchtop calibration pump combines an ultra-high pressure range with a dual-piston system, a large 420 ml reservoir, precise fine adjustment and three pressure ports. It is specifically designed for demanding calibration applications involving high pressures and large-volume workloads.

The Additel ADT 959A is an ideal comparison pressure source for calibrating high-pressure gauges, digital pressure indicators, pressure transducers and other pressure measuring instruments. Its integrated hand pump efficiently fills larger hydraulic volumes, while the high-pressure fine adjustment screw press provides smooth pressure increase and decrease when approaching individual calibration points.

An integrated isolation valve separates the calibration volume from the check valve associated with the hand pump. Since check valves can become a potential source of leakage and maintenance, this design helps improve pressure stability and reduces the influence of the hand pump mechanism during precision measurements.

The ADT 959A uses Diethylhexyl Sebacate as its hydraulic pressure medium. The large 420 ml reservoir provides sufficient hydraulic capacity for demanding calibration setups and large-volume workloads.

At europascal, the Additel ADT 959A complements a comprehensive range of professional high-pressure calibration equipment. In addition to supplying advanced pressure generation and measurement technology, europascal provides accredited calibration services for pressure and other measurement quantities. Find more information about professional calibration and metrological traceability at the europascal Calibration Service.

Your Benefits at a Glance

The Additel ADT 959A combines ultra-high hydraulic pressure generation with efficient filling of large-volume systems and precise pressure adjustment.

Key advantages include:

• Hydraulic pressure generation from 0 to 40,000 psi / 2,800 bar
• Professional ultra-high pressure benchtop design
• Designed for large-volume workloads
• Dual-piston pressure generation system
• Integrated hand pump for efficient system filling
• High-pressure fine adjustment screw press
• Smooth pressure increase and decrease
• 2.5 ml fine adjustment piston volume
• 3.72 ml volume per hand pump stroke
• Large 420 ml hydraulic reservoir
• Integrated isolation valve
• Improved pressure stability
• Reduced influence of hand pump check valve leakage
• Three pressure ports
• Dedicated test and reference gauge connections
• Diethylhexyl Sebacate as pressure medium
• Stainless steel ram and adapters
• Robust benchtop construction
• Completely manual operation
• No electrical power required
• Suitable for professional calibration laboratories
• Designed for pressure gauges, indicators and transducers

Ultra-High Pressure Generation up to 2,800 bar

The Additel ADT 959A generates hydraulic gauge pressure from:

0 psi / 0 bar

to:

40,000 psi / 2,800 bar.

This exceptional pressure range makes the ADT 959A suitable for demanding industrial and laboratory applications extending far beyond the pressure capability of conventional hydraulic calibration pumps.

Typical devices under test include:

• Ultra-high pressure gauges
• Mechanical pressure gauges
• Digital pressure gauges
• Hydraulic pressure gauges
• High-pressure test gauges
• Precision pressure indicators
• Pressure transducers
• Pressure sensors
• Industrial high-pressure measuring instruments

The ability to generate up to 2,800 bar manually provides considerable flexibility for specialist high-pressure calibration laboratories.

Designed for Large-Volume Workloads

One of the defining features of the Additel ADT 959A is its ability to efficiently pressurize large-volume workloads.

Ultra-high pressure calibration systems can contain significant internal hydraulic volume due to:

• Large devices under test
• Long high-pressure tubing
• Multiple adapters
• Reference pressure instruments
• Calibration manifolds
• Complex hydraulic connections

The integrated hand pump efficiently fills these systems before the high-pressure screw press is used for final pressure generation and adjustment.

This combination significantly improves usability compared with systems that rely exclusively on a screw press to fill and pressurize the complete hydraulic circuit.

Dual-Piston Pressure Generation

The Additel ADT 959A uses a dual-piston pressure generation system.

The hand pump provides a volume per stroke of:

3.72 ml.

This enables the operator to efficiently fill and initially pressurize the connected hydraulic system.

The fine adjustment piston provides a volume of:

2.5 ml.

Once the initial pressure has been generated, the high-pressure screw press is used to increase the pressure smoothly toward the required calibration point.

The dual-piston concept therefore combines efficient system filling with controlled ultra-high pressure generation.

Smooth Pressure Increase and Decrease

Precise control becomes increasingly important at very high hydraulic pressures.

The Additel ADT 959A incorporates a high-pressure fine adjustment screw press that allows the pressure to be increased and decreased smoothly.

This enables the operator to approach individual calibration points in a controlled manner.

Smooth pressure adjustment is particularly valuable when calibrating:

• High-resolution pressure gauges
• Reference pressure instruments
• High-pressure indicators
• Pressure transducers
• Precision pressure sensors

After the desired pressure has been reached, sufficient stabilization time should be allowed before recording measurement values.

Isolation Valve for Improved Pressure Stability

The Additel ADT 959A incorporates an isolation valve that separates the calibration volume from the check valve associated with the hand pump.

This is an important feature for precision comparison calibration.

Check valves can become a potential source of leakage and may require maintenance during the service life of a conventional hydraulic hand pump.

Once the approximate pressure has been generated, the isolation valve allows the calibration volume to be separated from the hand pump section.

This helps provide:

• More stable pressure measurements
• Reduced influence of check valve leakage
• Improved comparison conditions
• Reduced potential maintenance
• Better isolation of the calibration volume

This design is particularly useful when working with high-resolution reference pressure instruments at ultra-high pressures.

Diethylhexyl Sebacate Pressure Medium

The Additel ADT 959A uses:

Diethylhexyl Sebacate

as its hydraulic pressure medium.

The pump is supplied with a 250 ml bottle of Diethylhexyl Sebacate.

Additional pressure medium is available from Additel under model number 9201 in a one-liter quantity.

Using the specified hydraulic medium is important for reliable pressure generation and compatibility with the internal components of the pump.

Before connecting a device under test, its compatibility with the hydraulic pressure medium should always be verified.

Large 420 ml Reservoir

The Additel ADT 959A incorporates a large reservoir with a capacity of:

420 ml.

The generous reservoir volume supports the pump’s intended use with large-volume hydraulic workloads.

This is particularly beneficial when the calibration setup contains:

• Large internal cavities
• Multiple pressure instruments
• Long high-pressure lines
• External manifolds
• Additional adapters and fittings

An optional external reservoir expansion hose kit is also available for applications requiring additional flexibility.

Three Pressure Ports

The Additel ADT 959A provides:

three pressure ports.

This configuration offers considerable flexibility when setting up an ultra-high pressure comparison calibration system.

The standard test gauge and reference gauge connections use:

Autoclave F-250-C, 9/16″-18 UNF female connections.

Additel also lists:

1/2 BSP female

and:

M20 × 1.5 female

connections as available upon request.

The use of ultra-high pressure connections reflects the demanding 2,800 bar operating range of the ADT 959A.

Professional Comparison Calibration

The Additel ADT 959A is designed as a professional comparison pressure test pump.

A typical calibration configuration consists of:

Additel ADT 959A + Reference Pressure Instrument + Device Under Test

The reference instrument and device under test are connected to the hydraulic system.

The integrated hand pump is first used to fill the system and generate the initial pressure.

The high-pressure fine adjustment screw press is then used to approach the required calibration point.

The isolation valve separates the calibration volume from the check valve associated with the hand pump.

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

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

High-Pressure Gauge Calibration

The Additel ADT 959A is particularly suitable for calibrating high-pressure gauges.

Typical applications include:

• Mechanical high-pressure gauges
• Digital high-pressure gauges
• Hydraulic pressure gauges
• Test gauges
• Precision pressure indicators
• Ultra-high pressure measuring instruments

The ADT 959A generates the hydraulic pressure but does not itself provide the traceable reference pressure value.

For professional calibration, the pump must therefore be combined with an appropriate reference pressure instrument suitable for the required pressure range and measurement uncertainty.

The achievable measurement uncertainty depends on the complete calibration system, including the reference standard, pressure stability, environmental conditions, pressure medium, calibration procedure and all relevant contributions to the measurement uncertainty budget.

Pressure Transducer Calibration

The Additel ADT 959A can also provide the hydraulic pressure source required for high-pressure transducer calibration.

A suitable reference pressure instrument measures the applied hydraulic pressure.

The electrical output of the pressure transducer can simultaneously be measured using appropriate electrical measurement equipment.

Several increasing and decreasing pressure points can be generated to evaluate characteristics such as:

• Measurement deviation
• Repeatability
• Hysteresis
• Zero behavior
• Span behavior

The smooth fine adjustment mechanism supports precise positioning of the individual calibration points.

Robust Benchtop Construction

The Additel ADT 959A is designed as a professional benchtop calibration pump.

The ram and adapters are manufactured from:

stainless steel.

The body combines:

stainless steel, aluminum and copper.

Seal materials include:

Buna-N, PTFE, copper alloy and aluminum alloy.

The dimensions are approximately:

455 × 380 mm base

with a height of approximately:

175 mm.

The pump weighs approximately:

13 kg / 28.7 lb.

This robust construction is designed for permanent use in professional high-pressure calibration environments.

Technical Highlights

Additel ADT 959A vs. Additel ADT 946A

The Additel ADT 959A and Additel ADT 946A are both professional hydraulic benchtop calibration pumps designed for large-volume workloads.

The most important difference is the maximum pressure.

The Additel ADT 946A generates pressure up to:

15,000 psi / 1,000 bar.

The Additel ADT 959A extends this range to:

40,000 psi / 2,800 bar.

This means that the ADT 959A provides almost three times the maximum pressure capability of the ADT 946A.

Both designs use a dual-piston system, an integrated hand pump and a high-pressure fine adjustment screw press.

Both also provide a:

420 ml reservoir

and:

2.5 ml fine adjustment piston volume.

However, the ultra-high pressure capability of the ADT 959A requires dedicated high-pressure connections such as the Autoclave F-250-C interface.

For applications up to 1,000 bar, the ADT 946A provides a professional benchtop calibration solution.

For specialist applications requiring pressures between 1,000 and 2,800 bar, the Additel ADT 959A provides the required ultra-high pressure capability.

Additel ADT 959A vs. Additel ADT 960

For applications requiring even higher pressures, Additel also offers the ADT 960.

The Additel ADT 959A provides a maximum pressure of:

40,000 psi / 2,800 bar.

The Additel ADT 960 extends the range to:

60,000 psi / 4,200 bar.

Both pumps are designed for ultra-high pressure comparison calibration and use a dual-piston concept for filling large-volume systems and generating high pressure.

The appropriate model can therefore be selected according to the maximum pressure required by the calibration application.

Accessories for the Additel ADT 959A

Additel offers dedicated accessories for the ADT 959A.

Available accessories include:

• Additel 9201 Diethylhexyl Sebacate
• Additel ADT 104 adapter and fitting set
• Additel ADT 959A-MK maintenance kit
• Additel ADT 100-959-HK external reservoir expansion hose kit
• Additel 9910 carrying case

The ADT 104 adapter and fitting set provides 1/4 HP male connections to a range of male and female pressure connectors.

The 9910 carrying case is suitable for the Additel ADT 946A, Additel ADT 959A and Additel ADT 960.

The ADT 959A can also be ordered as a SET configuration with the pump and carrying case.

Typical Applications

The Additel ADT 959A is suitable for:

• Ultra-high pressure calibration
• Hydraulic pressure calibration
• High-pressure gauge calibration
• Digital pressure gauge calibration
• Test gauge calibration
• Pressure indicator calibration
• Pressure transducer calibration
• Pressure sensor calibration
• Comparison pressure calibration
• Large-volume hydraulic workloads
• Professional calibration laboratories
• Industrial high-pressure measurement
• Research and development
• High-pressure test systems
• Pressure metrology applications

Why Choose the Additel ADT 959A?

The Additel ADT 959A combines ultra-high hydraulic pressure generation, large-volume capability and precise pressure adjustment in a professional benchtop calibration pump.

Its pressure range from 0 to 40,000 psi / 2,800 bar enables demanding calibration applications that extend far beyond the range of conventional hydraulic pressure pumps.

The dual-piston system combines an integrated hand pump for efficient filling of large-volume workloads with a high-pressure fine adjustment screw press for smooth pressure increase and decrease.

A large 420 ml reservoir provides substantial hydraulic capacity, while the 2.5 ml fine adjustment piston supports controlled pressure generation.

The integrated isolation valve separates the calibration volume from the check valve associated with the hand pump. This helps provide more stable measurements while reducing the potential influence of leakage and maintenance associated with the check valve.

Three pressure ports provide flexibility when configuring professional comparison calibration systems.

The standard Autoclave F-250-C high-pressure connections are designed for the demanding pressure range of the ADT 959A, while 1/2 BSP female and M20 × 1.5 female connections are available upon request.

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

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 959A is available on the official Additel website.

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