The europascal BH2-700B DP Dual Piston Deadweight Tester is a high-performance hydraulic pressure standard designed for precise calibration over an exceptionally wide pressure range from 1 to 700 bar. The DP – Dual Piston – configuration uses two precision piston-cylinder systems to extend the measuring range toward lower pressures while maintaining excellent performance at pressures up to 700 bar.
With a standard accuracy of 0.01 % of reading and enhanced performance up to 0.006 % on request, the BH2-700B DP is designed for professional calibration laboratories, pressure instrument manufacturers, industrial quality assurance departments and service organizations.
The complete measuring range is:
1 to 700 bar
corresponding to:
0.1 to 70 MPa
100 to 70,000 kPa
and, according to the manufacturer:
10 to 10,000 psi
The BH2-700B DP incorporates two piston-cylinder systems. The typical piston areas are 78.4472 mm² for the low-pressure piston and 7.84068 mm² for the high-pressure piston.
The low-pressure piston is manufactured from treated steel, while the high-pressure piston uses tungsten carbide. The cylinders are manufactured from treated steel.
The instrument uses the CH2-1250B pressure generator and operates with H40 oil with a specified density of approximately 860 kg/m³.
The europascal calibration service provides professional calibration solutions for deadweight testers, pressure balances, pressure gauges, sensors, transmitters and other pressure measuring instruments.
Your Benefits at a Glance
The europascal BH2-700B DP Dual Piston Deadweight Tester provides:
- Hydraulic dual piston deadweight tester
- Wide measuring range from 1 to 700 bar
- Measuring range from 0.1 to 70 MPa
- Measuring range from 100 to 70,000 kPa
- Manufacturer range from 10 to 10,000 psi
- Standard accuracy of 0.01 % of reading
- Enhanced performance up to 0.006 % on request
- Two precision piston-cylinder systems
- Low-pressure piston for the lower pressure range
- High-pressure piston for the upper pressure range
- Typical LP piston area of 78.4472 mm²
- Typical HP piston area of 7.84068 mm²
- Treated steel low-pressure piston
- Tungsten carbide high-pressure piston
- Treated steel cylinders
- CH2-1250B pressure generator
- H40 oil as pressure medium
- Fluid density approximately 860 kg/m³
- Approx. 22 kg instrument weight without masses
- Stainless steel calibration masses
- Standard or customer-specific gravity
- Optional motorized mass rotation
- Optional piston position visualization
- Optional automatic pressure calculation
- Optional computer data transfer
Measuring Range from 1 to 700 bar
The major advantage of the europascal BH2-700B DP is its wide hydraulic measuring range:
1 to 700 bar
This corresponds to:
0.1 to 70 MPa
and:
100 to 70,000 kPa
AREMECA specifies the imperial measuring range as:
10 to 10,000 psi
The maximum pressure is:
700 bar / 70 MPa
The dual piston configuration enables the BH2-700B DP to start at only 1 bar, whereas a single-piston system optimized for higher pressures typically has a higher minimum pressure.
Dual Piston Technology
The abbreviation DP stands for:
Dual Piston
The BH2-700B DP therefore incorporates:
2 precision piston-cylinder systems
Instead of attempting to cover the complete dynamic pressure range with a single piston, the instrument uses separate piston systems optimized for different pressure regions.
This provides a wider usable pressure range while maintaining the physical advantages of a precision deadweight tester.
Low-Pressure Piston
The low-pressure piston is identified as:
BP / Low Pressure
The typical piston area is:
78.4472 mm²
The low-pressure piston is manufactured from:
treated steel
Its relatively large piston area allows lower pressures to be generated with practical calibration masses.
This piston is therefore particularly important for extending the usable measuring range down to 1 bar.
High-Pressure Piston
The high-pressure piston is identified as:
HP / High Pressure
The typical piston area is:
7.84068 mm²
The high-pressure piston is manufactured from:
tungsten carbide
The significantly smaller piston area enables higher pressures to be generated with manageable calibration masses.
The HP piston provides the pressure capability required to reach the maximum pressure of:
700 bar / 70 MPa
Why Two Piston Areas?
The relationship between force, piston area and pressure can be expressed as:
p = F / A
where:
p = pressure
F = force
A = effective piston area
A large piston area is advantageous for generating relatively low pressures.
A smaller piston area allows significantly higher pressures to be generated using the same applied force.
The BH2-700B DP therefore combines two different piston areas:
LP: 78.4472 mm²
HP: 7.84068 mm²
The area ratio is approximately:
10 : 1
This explains why the dual piston configuration can cover such a wide pressure range efficiently.
Physical Deadweight Tester Principle
The europascal BH2-700B DP generates pressure according to the physical piston gauge principle.
The gravitational force produced by the calibration masses is approximately:
F = m × g
where:
m = applied mass
g = gravitational acceleration
Combined with:
p = F / A
the simplified pressure equation becomes:
p = (m × g) / A
The generated pressure is therefore fundamentally related to calibrated mass, gravitational acceleration and the effective area of the selected piston-cylinder system.
For high-accuracy applications, additional corrections and influence quantities must be considered according to the calibration data.
Accuracy of 0.01 % of Reading
The standard accuracy of the europascal BH2-700B DP is:
0.01 % of reading
For more demanding applications, enhanced performance is available:
up to 0.006 % on request
The actual measurement uncertainty achieved during a calibration depends on the individual calibration data, environmental conditions, applied corrections, operating procedure and the device under test.
H40 Oil as Pressure Medium
The BH2-700B DP operates hydraulically with:
H40 oil
The manufacturer specifies a fluid density of approximately:
860 kg/m³
Correct filling and venting of the hydraulic circuit are important for reliable operation.
Trapped gas should be minimized because it can influence pressure generation, settling time and pressure stability.
The compatibility of the pressure medium with the connected device under test should always be checked before calibration.
CH2-1250B Pressure Generator
The europascal BH2-700B DP uses the:
CH2-1250B pressure generator
The pressure generator provides the hydraulic pressure required to raise the piston and balance the applied calibration masses.
The operator adjusts the pressure until the selected piston reaches its correct operating position and the system is in equilibrium.
This provides a robust physical method for generating known reference pressures.
Calibration Masses
The BH2 series uses precision:
stainless steel calibration masses
The masses generate the gravitational force acting on the selected piston.
Together with the effective piston area and gravitational acceleration, the calibrated mass values determine the generated pressure.
Different pressure units can be selected for the principal mass set, including:
- bar
- psi
- kPa
Additional or intermediate mass sets can also be selected for other units.
Standard or Local Gravity
The force generated by a calibration mass depends on gravitational acceleration.
The conventional standard value is:
g = 9.80665 m/s²
Because actual gravitational acceleration varies geographically, the BH2-700B DP can be configured for either:
standard gravity
or:
a customer-specific local gravity value
Using the appropriate gravity value is important for precision pressure generation.
Measurement Uncertainty Contributions
The complete measurement uncertainty of a calibration with the BH2-700B DP can include contributions from:
- Calibration uncertainty of the masses
- Effective area of the LP piston
- Effective area of the HP piston
- Pressure coefficients
- Local gravitational acceleration
- Air buoyancy
- Piston-cylinder temperature
- Thermal expansion
- Hydraulic fluid properties
- Hydrostatic head difference
- Repeatability
- Sensitivity
- Pressure stability
- Resolution of the device under test
- Environmental conditions
The uncertainty budget should use the actual calibration data for the selected piston-cylinder system.
Operating Conditions
AREMECA specifies an operating temperature range of:
18 to 28 °C
The manufacturer’s reference calibration conditions are:
Temperature: 20 °C
Atmospheric pressure: 1013.25 hPa
Relative humidity: 50 %
Gravitational acceleration: 9.80665 m/s²
When the instrument is operated under different conditions, the generated pressure can be recalculated according to the relevant variables.
Leveling and DUT Connection
Correct leveling is important for reliable piston gauge operation.
The BH2 platform therefore includes:
- Leveling bubble
- Adjustable feet
The connection for the instrument under test is a:
swivel G1/2 standard connection
with other fittings available as options.
All fittings, adapters and connected devices must be rated for the maximum applied hydraulic pressure.
Instrument Weight
The standard BH2-700B DP weighs approximately:
22 kg without calibration masses
With option OP0004 or OP0301, the manufacturer specifies approximately:
24 kg without calibration masses
The total system weight additionally depends on the selected calibration mass set.
Optional OP0004 Motorization
The europascal BH2-700B DP can be equipped with:
Option OP0004
This provides:
- Motorized rotation of the masses
- Piston position visualization using indicator lights
Motorized rotation reduces manual intervention and can improve operating convenience during repetitive calibration procedures.
Optional OP0301 Calculator Module
For advanced calibration workflows, the BH2-700B DP can be equipped with:
Option OP0301
This provides functions including:
- Motorized operation
- Dynamic piston position visualization
- Environmental sensors
- Automatic pressure calculation
- Automatic display of generated pressure
- Consideration of temperature
- Consideration of atmospheric pressure
- Consideration of humidity
- Computer data transfer
- Calibration data traceability
- Support for calibration certificate generation
This allows the traditional physical pressure balance to be integrated into a more digitally supported calibration process.
Technical Highlights
Model: europascal BH2-700B DP
Device type: Dual Piston Hydraulic Deadweight Tester
Configuration: Dual piston
Number of pistons: 2
Measuring range: 1 to 700 bar
Measuring range: 0.1 to 70 MPa
Measuring range: 100 to 70,000 kPa
Manufacturer imperial range: 10 to 10,000 psi
Maximum pressure: 700 bar / 70 MPa
Standard accuracy: 0.01 % of reading
Enhanced performance: Up to 0.006 % on request
Typical LP piston area: 78.4472 mm²
Typical HP piston area: 7.84068 mm²
LP piston material: Treated steel
HP piston material: Tungsten carbide
Cylinder material: Treated steel
Generator base: CH2-1250B
Pressure medium: H40 oil
Fluid density: Approx. 860 kg/m³
Weight without masses: Approx. 22 kg
Measurement principle: Piston gauge / deadweight tester
Operating temperature: 18 to 28 °C
Standard gravity: 9.80665 m/s²
Local gravity: Available
Motorization: Optional OP0004 / OP0301
Automatic pressure calculation: Optional OP0301
Computer data transfer: Optional OP0301
Technical Data
| Feature | europascal BH2-700B DP |
|---|---|
| Manufacturer | europascal Aremeca |
| Model | BH2-700B DP |
| Device type | Dual Piston Hydraulic Deadweight Tester |
| Configuration | Dual piston |
| Number of pistons | 2 |
| Measuring range | 1–700 bar |
| Measuring range | 0.1–70 MPa |
| Measuring range | 100–70,000 kPa |
| Manufacturer imperial range | 10–10,000 psi |
| Maximum pressure | 700 bar / 70 MPa |
| Standard accuracy | 0.01 % of reading |
| Enhanced performance | Up to 0.006 % on request |
| Typical LP piston area | 78.4472 mm² |
| Typical HP piston area | 7.84068 mm² |
| LP piston material | Treated steel |
| HP piston material | Tungsten carbide |
| Cylinder material | Treated steel |
| Generator base | CH2-1250B |
| Pressure medium | H40 oil |
| Fluid density | Approx. 860 kg/m³ |
| Weight without masses | Approx. 22 kg |
| Operating temperature | 18–28 °C |
| Standard gravity | 9.80665 m/s² |
| Local gravity | Available |
| Motorization | Optional |
| Automatic pressure calculation | Optional OP0301 |
| Computer data transfer | Optional OP0301 |
BH2-700B DP vs. BH2-700B SP
The main difference between the two BH2-700B configurations is the number of piston-cylinder systems and the resulting lower measuring limit.
| Feature | BH2-700B DP | BH2-700B SP |
|---|---|---|
| Configuration | Dual piston | Single piston |
| Number of pistons | 2 | 1 |
| Minimum pressure | 1 bar | 2 bar |
| Maximum pressure | 700 bar | 700 bar |
| Standard accuracy | 0.01 % | 0.01 % |
| Generator base | CH2-1250B | CH2-1250B |
| Pressure medium | H40 oil | H40 oil |
| Fluid density | 860 kg/m³ | 860 kg/m³ |
| Weight without masses | Approx. 22 kg | Approx. 22 kg |
The BH2-700B DP is particularly attractive when a wide dynamic pressure range is required. Its dual piston design reduces the minimum pressure from 2 bar to 1 bar while retaining a maximum pressure of 700 bar.
Typical Calibration Applications
The europascal BH2-700B DP Dual Piston Deadweight Tester is suitable for testing, adjustment and calibration of:
- Mechanical pressure gauges
- Digital pressure gauges
- Reference pressure gauges
- Pressure sensors
- Pressure transducers
- Pressure transmitters
- Pressure switches
- Hydraulic pressure instruments
- Industrial pressure measurement systems
Typical users include:
- Professional calibration laboratories
- Pressure instrument manufacturers
- Industrial quality assurance departments
- Research laboratories
- Maintenance organizations
- Calibration service providers
Calibration and Traceability
The BH2-700B DP is supplied with a factory calibration certificate traceable to national standards.
An accredited COFRAC or DKD/DAkkS calibration certificate is available as an option.
Important metrological parameters include:
- Effective area of both piston-cylinder systems
- Pressure coefficients
- Calibration mass values
- Gravity value
- Temperature
- Repeatability
- Relevant correction quantities
The europascal calibration service provides professional calibration solutions for pressure balances, deadweight testers, pressure gauges, pressure sensors and pressure transmitters.
europascal can also provide support with maintenance, repair, configuration and selection of suitable pressure calibration equipment.
Why Choose the europascal BH2-700B DP?
The europascal BH2-700B DP Precise Dual Piston Deadweight Tester combines an exceptionally wide hydraulic measuring range from 1 to 700 bar with a standard accuracy of 0.01 % of reading and enhanced performance up to 0.006 % on request.
Its two precision piston-cylinder systems provide a wide dynamic measuring range. The low-pressure piston has a typical area of 78.4472 mm², while the high-pressure piston has a typical area of 7.84068 mm². The low-pressure piston is manufactured from treated steel and the high-pressure piston from tungsten carbide.
Together with the CH2-1250B pressure generator and H40 hydraulic oil, this dual piston configuration provides a robust physical pressure reference for demanding calibration applications from 1 bar up to 70 MPa.
Optional motorization, piston position visualization, automatic pressure calculation and computer data transfer allow the standard BH2 platform to be adapted to advanced calibration workflows.
Looking for the europascal BH2-700B DP or a dual piston hydraulic pressure calibration solution from 1 to 700 bar? Contact europascal for expert advice, system configuration and professional calibration services tailored to your requirements.
