The europascal BH4-700B DP Dual Piston Deadweight Tester is an automatic hydraulic pressure standard designed for precise calibration across a particularly wide pressure range. By integrating two piston-cylinder systems into one instrument, the BH4-700B DP provides two optimized measuring ranges: 1 to 60 bar for lower pressures and 10 to 700 bar for higher pressures.
Together, these two piston systems provide overall pressure coverage from 1 to 700 bar with an accuracy of 0.01 %. A major advantage of the dual-piston design is that both pressure ranges can be operated with a single set of calibration weights.
The BH4-700B DP combines the proven physical measurement principle of a deadweight tester with the automatic functionality of the BH4 platform. Motorized operation, dynamic piston position visualization, automatic pressure calculation and display, operator assistance, result recording and computer data transfer simplify demanding calibration procedures.
This combination makes the europascal BH4-700B DP particularly suitable for professional calibration laboratories that need both a wide measuring range and high accuracy from a single hydraulic pressure standard.
europascal provides professional support for pressure calibration equipment, system configuration, maintenance and calibration. The europascal calibration service provides professional solutions for deadweight testers, pressure balances, pressure gauges, pressure sensors, transmitters and other pressure measuring equipment.
Your Benefits at a Glance
The europascal BH4-700B DP Dual Piston Deadweight Tester combines two optimized piston-cylinder systems with the automatic functionality of the BH4 platform.
Key benefits include:
- Automatic hydraulic deadweight tester
- Dual-piston configuration
- Two precision piston-cylinder systems
- Low-pressure range from 1 to 60 bar
- High-pressure range from 10 to 700 bar
- Overall pressure coverage from 1 to 700 bar
- Accuracy of 0.01 %
- One common calibration weight set for both pressure ranges
- Overlapping ranges from 10 to 60 bar
- Physical piston gauge measurement principle
- Hydraulic operation with oil
- Motorized operation
- Dynamic piston position visualization
- Automatic calculation of generated pressure
- Automatic pressure display
- Different pressure units
- Operator assistance during calibration
- Recording of calibration results
- Computer data transfer
- Designed for professional calibration laboratories
Dual Pressure Ranges from 1 to 700 bar
The main advantage of the europascal BH4-700B DP is its dual-piston configuration.
The first piston-cylinder system covers:
1 to 60 bar
or according to the manufacturer’s imperial specification:
10 to 800 psi
The second piston-cylinder system covers:
10 to 700 bar
or:
100 to 10,000 psi
This results in overall pressure coverage from:
1 to 700 bar
with an overlap between the two systems from:
10 to 60 bar
The overlapping range provides flexibility when selecting the most appropriate piston-cylinder system for a particular calibration point.
Two Pistons – One Weight Set
The abbreviation DP stands for the dual-piston configuration.
The BH4-700B DP integrates:
two precision piston-cylinder systems
A major advantage of the AREMECA concept is that the two measuring ranges are generated using:
one common set of calibration weights
This allows the instrument to provide two optimized pressure ranges without requiring two completely separate deadweight tester systems.
The result is a compact solution with excellent measuring range coverage for laboratories that calibrate instruments at both relatively low and high hydraulic pressures.
Accuracy of 0.01 %
The europascal BH4-700B DP provides a specified accuracy of:
0.01 %
This performance applies to the dual-piston pressure balance concept and makes the instrument suitable for demanding calibration applications.
The complete measurement uncertainty of an actual calibration additionally depends on the relevant influence quantities of the pressure balance and measurement setup.
Important contributions can include:
- Calibration of the mass set
- Effective area of the selected piston
- Pressure coefficient
- Local gravitational acceleration
- Air buoyancy
- Piston-cylinder temperature
- Pressure deformation
- Hydraulic fluid properties
- Hydrostatic head difference
- Repeatability
- Resolution of the device under test
- Environmental conditions
Because the BH4-700B DP uses two piston-cylinder systems, the effective piston area and associated calibration parameters of the selected piston must be correctly applied.
Fundamental Piston Gauge Measurement Principle
The europascal BH4-700B DP Dual Piston Deadweight Tester operates according to the fundamental physical piston gauge principle.
The basic relationship is:
p = F / A
where:
p = generated pressure
F = force acting on the piston
A = effective piston area
The gravitational force generated by the calibration masses is primarily determined by:
F = m × g
where:
m = applied mass
g = gravitational acceleration
The simplified pressure relationship is therefore:
p = (m × g) / A
The BH4-700B DP uses two different piston-cylinder systems. The effective piston area changes according to which piston system is being used.
This is what allows the same calibration mass set to generate two optimized pressure ranges.
For precision calibration, additional corrections can be considered for quantities such as local gravity, air buoyancy, temperature, pressure deformation and hydrostatic head.
Low-Pressure Piston from 1 to 60 bar
The low-pressure piston-cylinder system provides a measuring range from:
1 to 60 bar
This corresponds to approximately:
10 to 800 psi
The larger effective piston area required for the lower pressure range allows useful pressure increments to be generated without extremely small calibration masses.
This is one of the main metrological advantages of a dual-piston deadweight tester.
High-Pressure Piston from 10 to 700 bar
The second piston-cylinder system is optimized for the higher pressure range.
Its measuring range is:
10 to 700 bar
or approximately:
100 to 10,000 psi
A smaller effective piston area allows the same physical mass force to generate substantially higher pressure.
This provides the BH4-700B DP with a maximum pressure of:
700 bar / 70 MPa
while retaining the benefits of a precision piston gauge.
Overlapping Range from 10 to 60 bar
The two piston systems overlap between:
10 and 60 bar
This overlap is valuable because calibration points in this region can be generated using either piston system, depending on the measurement procedure and configuration.
The overlap also provides continuity between the two pressure ranges.
For laboratories covering a wide variety of pressure instruments, this is a significant advantage over a single-piston system.
Automatic BH4 Platform
The BH4 series combines the physical measurement principle of a deadweight tester with automatic operator assistance.
The system integrates functions for:
- Motorized operation
- Dynamic piston position visualization
- Automatic pressure calculation
- Automatic pressure display
- Different pressure units
- Calibration data recording
- Computer data transfer
The reference pressure itself continues to be generated physically by calibrated masses acting on the selected piston-cylinder system.
The automation simplifies operation, calculation and documentation.
Motorized Operation
Free rotation of the piston helps minimize friction effects between the piston and cylinder.
The BH4 platform provides motorized operation, reducing the amount of manual intervention required from the operator.
This is particularly useful during repetitive calibration procedures involving many pressure points.
For the BH4-700B DP, automatic operation is especially advantageous because the instrument combines two precision piston-cylinder systems within one calibration platform.
Dynamic Piston Position Visualization
Correct piston position is essential for reliable operation of a deadweight tester.
The BH4 platform therefore provides:
dynamic visualization of the piston position
This allows the operator to monitor the operating position of the piston during calibration.
The system assists the operator in determining when the piston is correctly balanced and operating within its appropriate working range.
Automatic Pressure Calculation and Display
The BH4 platform automatically assists with calculation of the pressure generated by the selected piston and applied mass combination.
This reduces manual calculation work and helps ensure that the correct piston-cylinder parameters are used.
Relevant calculation quantities can include:
- Applied mass
- Effective piston area
- Selected piston
- Gravitational acceleration
- Temperature
- Atmospheric pressure
- Relative humidity
- Relevant correction quantities
The resulting reference pressure can then be displayed directly to the operator.
Different Pressure Units
The automatic calculation system provides flexibility regarding pressure units.
Depending on the configuration, the generated pressure can be represented in units such as:
- bar
- kPa
- MPa
- psi
- kg/cm²
This is useful for calibration laboratories working with pressure instruments from different countries and industries.
Recording of Calibration Results
The europascal BH4-700B DP supports recording of calibration results.
This can simplify:
- Calibration documentation
- Measurement traceability
- Quality assurance
- Evaluation of devices under test
- Calibration history
- Digital laboratory workflows
Electronic data handling also reduces the need for manual transcription of measurement values.
Computer Data Transfer
Calibration information can be transferred to a computer.
This allows the BH4-700B DP to be incorporated into modern digital calibration workflows.
For laboratories processing large numbers of instruments or measurement points, computer data transfer can reduce manual documentation work and minimize transcription errors.
Hydraulic Operation with Oil
The europascal BH4-700B DP is a hydraulic pressure balance operating with:
oil
Hydraulic operation provides efficient pressure generation across the complete 1 to 700 bar range.
Correct filling and venting are important because trapped gas can affect pressure generation and settling behavior.
The hydraulic medium must also be compatible with the device under test and all wetted components.
Standard Gravity and Local Gravity
The force generated by calibration masses depends on gravitational acceleration.
The conventional standard value is:
g = 9.80665 m/s²
Because actual gravitational acceleration varies geographically, an appropriate local gravity value can be used for precision calibration.
The pressure balance can therefore be configured according to standard gravity or a customer-specific gravity value.
Technical Highlights
Model: europascal BH4-700B DP
Device type: Automatic Dual Piston Hydraulic Deadweight Tester
Product family: BH4 Automatic
Configuration: Dual piston
Number of pistons: 2
Low-pressure range: 1 to 60 bar
High-pressure range: 10 to 700 bar
Overall pressure coverage: 1 to 700 bar
Overlap: 10 to 60 bar
Maximum pressure: 700 bar / 70 MPa
Accuracy: 0.01 %
Measurement principle: Piston gauge / deadweight tester
Pressure medium: Oil
Weight concept: One common weight set for both ranges
Motorization: Integrated
Piston position visualization: Dynamic
Pressure calculation: Automatic
Pressure display: Automatic
Result recording: Integrated
Computer data transfer: Available
Technical Data
| Feature | europascal BH4-700B DP |
|---|---|
| Manufacturer | europascal Aremeca |
| Model | BH4-700B DP |
| Device type | Automatic Dual Piston Deadweight Tester |
| Product family | BH4 Automatic |
| Configuration | Dual piston |
| Number of pistons | 2 |
| Low-pressure range | 1–60 bar |
| Low-pressure range | 10–800 psi |
| High-pressure range | 10–700 bar |
| High-pressure range | 100–10,000 psi |
| Overall pressure coverage | 1–700 bar |
| Overlapping range | 10–60 bar |
| Maximum pressure | 700 bar / 70 MPa |
| Accuracy | 0.01 % |
| Measurement principle | Piston gauge |
| Pressure medium | Oil |
| Weight sets | One common set for both ranges |
| Motorized operation | Integrated |
| Piston position visualization | Dynamic |
| Automatic pressure calculation | Integrated |
| Automatic pressure display | Integrated |
| Result recording | Integrated |
| Computer data transfer | Available |
BH4-700B DP vs. BH4-700B SP
The main difference between the BH4-700B DP and BH4-700B SP is the number of piston-cylinder systems and the resulting minimum pressure.
| Feature | BH4-700B DP | BH4-700B SP |
|---|---|---|
| Piston configuration | Dual piston | Single piston |
| Number of pistons | 2 | 1 |
| Overall coverage | 1–700 bar | 2–700 bar |
| Low-pressure range | 1–60 bar | – |
| High-pressure range | 10–700 bar | 2–700 bar |
| Range overlap | 10–60 bar | – |
| Accuracy | 0.01 % | 0.01 % |
| Operation | Automatic | Automatic |
| Pressure medium | Oil | Oil |
The BH4-700B DP is particularly advantageous when accurate pressure generation near the lower end of the range is important.
Its dedicated low-pressure piston provides a starting pressure of only 1 bar while the second piston extends the range to 700 bar.
The BH4-700B SP is the simpler alternative when a minimum pressure of 2 bar is sufficient and one piston-cylinder system is preferred.
Other BH4 Dual Piston Models
The BH4 automatic deadweight tester family also includes several dual-piston configurations for different maximum pressures.
| Model | Measuring Ranges | Accuracy |
|---|---|---|
| BH4-300B DP | 1–60 + 5–300 bar | 0.01 % |
| BH4-400B DP | 1–60 + 5–400 bar | 0.01 % |
| BH4-600B DP | 1–60 + 10–600 bar | 0.01 % |
| BH4-700B DP | 1–60 + 10–700 bar | 0.01 % |
| BH4-1200B DP | 1–60 + 20–1,200 bar | 0.01 % |
The BH4-700B DP therefore provides an attractive solution for laboratories requiring automatic hydraulic calibration over a broad range while maintaining 0.01 % accuracy.
Typical Calibration Applications
The europascal BH4-700B DP Dual Piston Deadweight Tester is particularly suitable for calibration of:
- Precision pressure gauges
- Digital pressure gauges
- Pressure sensors
- Pressure transducers
- Pressure transmitters
- Hydraulic pressure indicators
- Reference pressure instruments
- Industrial hydraulic measuring systems
- High-pressure measurement equipment
The wide 1 to 700 bar overall range makes the instrument particularly useful for laboratories that calibrate many different types and ranges of hydraulic pressure instruments.
Calibration and Traceability
Regular calibration of a dual-piston pressure balance is important for maintaining reliable metrological performance.
Relevant components and parameters include:
- Low-pressure piston-cylinder assembly
- High-pressure piston-cylinder assembly
- Calibration mass set
- Effective area of each piston
- Pressure coefficients
- Temperature behavior
- Gravity value
- Relevant correction quantities
The europascal calibration service provides professional calibration solutions for deadweight testers, pressure balances, pressure gauges, sensors, transmitters and other pressure measuring equipment.
europascal can also provide support with system configuration, maintenance and selection of suitable pressure calibration equipment.
Why Choose the europascal BH4-700B DP?
The europascal BH4-700B DP Precise Dual Piston Deadweight Tester combines two optimized piston-cylinder systems, an overall pressure range from 1 to 700 bar, an accuracy of 0.01 % and the automatic functionality of the BH4 platform.
The low-pressure piston covers 1 to 60 bar, while the high-pressure piston covers 10 to 700 bar. Both ranges can be generated using a common calibration weight set.
This dual-piston configuration provides excellent flexibility across a wide pressure range while maintaining the physical traceability advantages of a piston gauge.
Motorized operation, dynamic piston position visualization, automatic pressure calculation and display, result recording and computer data transfer reduce operator workload and simplify repetitive calibration procedures.
For professional laboratories requiring precise automatic hydraulic pressure calibration from very low pressures up to 700 bar, the BH4-700B DP provides a powerful combination of range, accuracy and automation.
Looking for the europascal BH4-700B DP or an automatic dual-piston pressure calibration solution from 1 to 700 bar? Contact europascal for expert advice, system configuration and professional calibration services tailored to your requirements.
