The europascal BH4-300B DP Dual Piston Deadweight Tester is an automatic hydraulic pressure standard designed for precise calibration across a wide pressure range. Its dual-piston configuration combines two optimized piston-cylinder systems in one instrument: a low-pressure range from 1 to 60 bar and a high-pressure range from 5 to 300 bar.
Together, these two piston systems provide continuous overall pressure coverage from 1 to 300 bar with an accuracy of 0.01 %. Both pressure ranges are generated using one common calibration weight set, making the BH4-300B DP a flexible and efficient solution for professional calibration laboratories.
The low-pressure piston covers 1 to 60 bar (10 to 800 psi), while the high-pressure piston covers 5 to 300 bar (50 to 4,000 psi). The overlapping range from 5 to 60 bar provides additional flexibility when selecting the appropriate piston-cylinder system for a calibration point.
The BH4-300B DP combines the proven physical measurement principle of a piston gauge with the advanced automatic functionality of the BH4 platform. Motorized operation, dynamic piston position visualization, automatic pressure calculation, calibration data functions and computer communication reduce operator workload and simplify repetitive calibration procedures.
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, pressure transmitters and other pressure measuring equipment.
Your Benefits at a Glance
The europascal BH4-300B DP Dual Piston Deadweight Tester combines two optimized pressure ranges with automatic operation.
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 5 to 300 bar
- Overall pressure coverage from 1 to 300 bar
- Overlapping range from 5 to 60 bar
- Accuracy of 0.01 %
- One common calibration weight set for both ranges
- Hydraulic operation with oil
- Physical piston gauge measurement principle
- Motorized operation
- Dynamic piston position visualization
- Automatic pressure calculation
- Automatic pressure display
- Different pressure units
- Calibration data functions
- Computer communication
- Standard or customer-specific gravity
- Designed for professional calibration laboratories
Dual Pressure Ranges from 1 to 300 bar
The key feature of the europascal BH4-300B DP is its dual-piston design.
The first piston-cylinder system covers:
1 to 60 bar
or:
10 to 800 psi
The second piston-cylinder system covers:
5 to 300 bar
or:
50 to 4,000 psi
Together, both piston systems provide overall pressure coverage from:
1 to 300 bar
The maximum pressure is:
300 bar / 30 MPa
This broad measuring range allows pressure instruments with very different full-scale values to be calibrated using one automatic pressure balance.
Dual Piston – Two Pistons with One Weight Set
The designation DP stands for the dual-piston configuration.
The BH4-300B DP therefore incorporates:
two precision piston-cylinder systems
The two pistons have different effective areas and are optimized for different parts of the measuring range.
A major advantage of the design is that both ranges are generated using:
one common calibration weight set
This allows two optimized pressure ranges to be provided without requiring two independent deadweight testers and two separate mass sets.
Overlapping Range from 5 to 60 bar
The two piston-cylinder systems overlap between:
5 and 60 bar
Within this range, calibration pressures can be generated using either piston system according to the calibration procedure and laboratory requirements.
The broad overlap provides a smooth transition between the low-pressure and high-pressure ranges and increases flexibility during calibration.
Accuracy of 0.01 %
The europascal BH4-300B DP provides a specified accuracy of:
0.01 %
This makes the instrument suitable for demanding hydraulic pressure calibration applications.
The complete measurement uncertainty of an actual calibration additionally depends on the individual influence quantities of the pressure balance and measurement setup.
Relevant 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 BH4-300B DP contains two piston-cylinder systems, the correct calibration parameters for the selected piston must be used for each pressure point.
Physical Piston Gauge Measurement Principle
The europascal BH4-300B DP Dual Piston Deadweight Tester operates according to the fundamental physical principle of a piston gauge.
The basic relationship is:
p = F / A
where:
p = generated pressure
F = force acting on the piston
A = effective piston area
The force generated by the calibration masses is primarily determined by:
F = m × g
where:
m = applied mass
g = gravitational acceleration
The simplified relationship is therefore:
p = (m × g) / A
The dual-piston concept uses two different effective piston areas.
A larger effective piston area is particularly advantageous at lower pressures. A smaller effective piston area enables higher pressures to be generated using the same mass force.
This physical relationship allows the BH4-300B DP to generate two different pressure ranges using one common calibration weight set.
Low-Pressure Piston from 1 to 60 bar
The first piston-cylinder system is optimized for the lower pressure range:
1 to 60 bar
or:
10 to 800 psi
The larger effective piston area allows useful pressure increments to be generated at relatively low hydraulic pressures.
The dedicated low-pressure piston extends the lower limit of the complete instrument to only:
1 bar
This makes the BH4-300B DP particularly useful when a laboratory needs to calibrate both low-range and higher-range hydraulic pressure instruments.
High-Pressure Piston from 5 to 300 bar
The second piston-cylinder system is optimized for:
5 to 300 bar
or:
50 to 4,000 psi
The smaller effective piston area allows the common mass set to generate substantially higher pressures.
The maximum pressure is:
300 bar / 30 MPa
The combination of both piston systems therefore provides continuous pressure coverage from 1 to 300 bar.
Automatic BH4 Platform
The BH4 series combines a physical pressure reference with automatic operator assistance.
The system provides functions for:
- Motorized operation
- Dynamic piston position visualization
- Automatic pressure calculation
- Display of the generated reference pressure
- Environmental correction support
- Different pressure units
- Calibration data traceability
- Computer communication
The reference pressure itself continues to be generated physically by calibrated masses acting on the selected piston-cylinder system.
The automatic functions simplify operation, monitoring, calculation and documentation.
Motorized Operation
Free rotation of the piston is important for reducing friction effects between the piston and cylinder.
The BH4 platform provides integrated motorized operation.
This reduces manual intervention and provides additional convenience during repetitive calibration procedures.
For a dual-piston instrument such as the BH4-300B DP, automatic operation is especially useful when calibration sequences contain many pressure points across both ranges.
Dynamic Piston Position Visualization
Correct piston position is essential for reliable pressure balance operation.
The BH4 platform therefore provides:
dynamic piston position visualization
The operator can monitor the active piston during calibration and determine whether it is operating within the appropriate working position.
This simplifies balancing and improves operator convenience compared with a purely manual deadweight tester.
Automatic Pressure Calculation
The integrated calculator assists with determining the generated reference pressure.
For a dual-piston pressure balance, the correct effective area and calibration parameters for the active piston-cylinder system must be selected.
Relevant quantities can include:
- Selected piston
- Applied calibration masses
- Effective piston area
- Local gravitational acceleration
- Environmental parameters
- Relevant correction quantities
The generated reference pressure can then be displayed directly to the operator.
Different Pressure Units
The BH4 platform allows pressure values to be calculated and displayed in different engineering units.
Depending on configuration, relevant units can include:
- bar
- kPa
- MPa
- psi
- kg/cm²
This provides flexibility when calibrating pressure instruments from different manufacturers, industries and countries.
Calibration Data and Computer Communication
The automatic BH4 platform supports digital calibration workflows.
Calibration data can be used for traceability and transferred for further processing.
This is particularly valuable for laboratories processing many devices or measurement points because it reduces manual calculation and transcription work.
Hydraulic Operation with Oil
The europascal BH4-300B DP is a hydraulic pressure balance operating with:
oil
Hydraulic operation provides efficient pressure transmission throughout the complete 1 to 300 bar measuring range.
Correct filling and venting of the system are important because trapped gas can affect pressure stability and settling behavior.
Compatibility between the hydraulic medium, device under test and wetted components should always be verified.
Standard or Local Gravity
The gravitational force generated by the calibration masses depends directly on gravitational acceleration.
The conventional standard value is:
g = 9.80665 m/s²
Actual gravitational acceleration varies geographically.
For precision calibration, the appropriate local gravity value should therefore be considered.
The pressure balance can be configured for standard gravity or a customer-specific local gravity value.
Technical Highlights
Model: europascal BH4-300B 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
Low-pressure range: 10 to 800 psi
High-pressure range: 5 to 300 bar
High-pressure range: 50 to 4,000 psi
Overall pressure coverage: 1 to 300 bar
Overlapping range: 5 to 60 bar
Maximum pressure: 300 bar / 30 MPa
Accuracy: 0.01 %
Measurement principle: Piston gauge / deadweight tester
Pressure medium: Oil
Weight concept: One common weight set for both piston systems
Motorization: Integrated
Piston position visualization: Dynamic
Pressure calculation: Automatic
Computer communication: Available
Technical Data
| Feature | europascal BH4-300B DP |
|---|---|
| Manufacturer | europascal Aremeca |
| Model | BH4-300B 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 | 5–300 bar |
| High-pressure range | 50–4,000 psi |
| Overall pressure coverage | 1–300 bar |
| Overlapping range | 5–60 bar |
| Maximum pressure | 300 bar / 30 MPa |
| Accuracy | 0.01 % |
| Measurement principle | Piston gauge |
| Pressure medium | Oil |
| Weight concept | One common set for both ranges |
| Motorized operation | Integrated |
| Piston position visualization | Dynamic |
| Automatic pressure calculation | Integrated |
| Computer communication | Available |
BH4-300B DP vs. BH4-300B SP
The main difference between the BH4-300B DP and BH4-300B SP is the piston configuration.
| Feature | BH4-300B DP | BH4-300B SP |
|---|---|---|
| Piston configuration | Dual piston | Single piston |
| Number of pistons | 2 | 1 |
| Overall pressure coverage | 1–300 bar | Single continuous range |
| Low-pressure piston | 1–60 bar | – |
| High-pressure piston | 5–300 bar | – |
| DP overlap | 5–60 bar | – |
| Accuracy | 0.01 % | 0.01 % |
| Operation | Automatic | Automatic |
| Pressure medium | Oil | Oil |
The BH4-300B DP is particularly attractive when optimized calibration performance at lower pressures is required.
Its dedicated low-pressure piston covers 1 to 60 bar, while the second piston covers the range from 5 to 300 bar.
Position within the BH4 Dual Piston Series
The BH4 automatic family provides several dual-piston configurations for different maximum pressures.
| Model | Piston 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 BH4-300B DP is therefore the dual-piston BH4 solution for applications requiring a maximum pressure of 300 bar.
Typical Calibration Applications
The europascal BH4-300B DP Dual Piston Deadweight Tester is particularly suitable for calibration of:
- Precision pressure gauges
- Digital pressure gauges
- Pressure sensors
- Pressure transducers
- Pressure transmitters
- Pressure switches
- Hydraulic pressure indicators
- Reference pressure instruments
- Industrial hydraulic measuring systems
- Pressure calibration equipment
Its broad overall pressure coverage makes the instrument particularly useful for laboratories calibrating pressure instruments with many different measuring ranges.
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 pressure balances, deadweight testers, pressure gauges, sensors, transmitters and other pressure measuring equipment.
europascal can also provide support with maintenance, system configuration and selection of suitable pressure calibration equipment.
Why Choose the europascal BH4-300B DP?
The europascal BH4-300B DP Precise Dual Piston Deadweight Tester combines two optimized piston-cylinder systems with the automatic functionality of the BH4 platform.
The low-pressure piston covers 1 to 60 bar, while the high-pressure piston covers 5 to 300 bar. Together, they provide continuous overall pressure coverage from 1 to 300 bar with an accuracy of 0.01 %.
Both piston systems use one common calibration weight set. This provides broad pressure coverage without requiring two independent pressure standards.
Integrated motorized operation, dynamic piston position visualization, automatic pressure calculation and digital data functions reduce operator workload and simplify repetitive calibration procedures.
For professional laboratories requiring precise automatic hydraulic calibration across a broad range from 1 to 300 bar, the BH4-300B DP provides an excellent combination of range, accuracy and automation.
Looking for the europascal BH4-300B DP or an automatic dual-piston hydraulic pressure calibration solution from 1 to 300 bar? Contact europascal for expert advice, system configuration and professional calibration services tailored to your requirements.
