Proven primary pressure standard
Deadweight Tester / Pressure Balances are the most accurate instrument available on the market for the calibration of electronic or mechanical pressure measuring instruments. The direct measurement of the pressure (p = F / A), as well as the use of high-quality materials enable a very small measurement uncertainty, in conjunction with an excellent long-term stability of 5 years (recommended in accordance with German Calibration Service DKD/DAkkS).
The deadweight tester / pressure balance has therefore been used for years in factory and calibration laboratories in national institutes, research laboratories and in industry.Stand-alone operation
Due to its integrated pressure generation and the pure mechanical measuring principle, the model LR-Cal LDW-H is ideal for on-site use for maintenance and service.Basic principle
Pressure is defined as the quotient of force and area. The core component of the model LR-Cal LDW-H is therefore a very pecisely manufatured piston-cylinder-system, which is loaded with masses in order to generate the individual test points.
The masses applied are proportional to the target pressure and this is achieved through optimally graduated weights. As standard, these masses are manufactured to the standard gravity (9.80665 m/s²), though the can be manufactured to a specific location (gravity) and also DAkkS-calibrated.Easy operation
In the stable instrument base, the integrated priming pump and the 250 ml tank enable large test volumes to be easily filled and pressurised. For further pressure increases and find adjustment, a very precisely-controllable spindle pump is fitted, which only runs within the pump body.
As soon as the measuring system reaches equilibrium, there is a balance of forces between the pressure and the mass load applied. The excellent quality of the system ensures that this pressure remains stable over several minutes, so that the pressure value for comparative measurements can be read without any problems, or also so that more complex adjustments can be carried out on the item under test.High-performance instrument range
The LR-Cal LDW-H instrument base is available in 2 variants:
- Standard hydraulic base
Up to max. 1,200 bar / 16,000 psi.
With integrated pressure generation through priming pump and spindle pump.
Standard pressure transmission medium: mineral oil. Optional: sebacate oil, brake fluid, Skydrol or Fomblin oil.
- Hydraulic high-pressure base
Up to max. 1,400 bar / 20,000 psi.
With integrated pressure generation through priming pump and spindle pump.
Pressure transmission medium: mineral oil or sebacate oilAs standard, both instruments bases are fitted with a connection for the piston-cylinder system with 3/4" BSP female thread.
With the 1,200 bar instrument base, a quick-release mechanism is available as an option. This enables the piston-cylinder system to be changed quickly and safely without any tools.
The connection of the test item is made without tools using a quick-connection. Via the freely-rotating knurled nut, the test item can be oriented as required. As standard, a threaded insert with a 1/2" BSP female thread is provided. Other threaded inserts are available to connect the most common pressure measuring instruments.
This item comes with a one year warranty from the manufacturer.
Please allow 4 - 5 weeks lead time for this new product to arrive.
*This tester ships via freight on a pallet ~100kg, please contact us for a shipping quote.*
LR-Cal LDW-H Hydraulic Deadweight Tester Pressure Calibrator Balance 20000 PSI
Available Accessories
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The weights included in the standard scope of delivery are ideally suited for everyday use. If you would like to generate intermediate values, however, we recommend using a set of trim-masses. Set of trim-masses, class F1
(1 x 50 g, 2 x 20 g, 1 x 10 g, 1 x 5 g, 2 x 2 g, 1 x 1 g,
1 x 500 mg, 2 x 200 mg, 1 x 100 mg, 1 x 50 mg,
2 x 20 mg, 1 x 10 mg, 1 x 5 mg, 2 x 2 mg, 1 x 1 mg -
Set of trim-masses, class M1
(1 x 50 g, 2 x 20 g, 1 x 10 g, 1 x 5 g, 2 x 2 g, 1 x 1 g,
1 x 500 mg, 2 x 200 mg, 1 x 100 mg, 1 x 50 mg,
2 x 20 mg, 1 x 10 mg, 1 x 5 mg, 2 x 2 mg, 1 x 1 mg -
As a standard, the deadweight tester / pressure balance is equipped with a quick connector for connecting the test item. For this purpose, various threaded adapters, which can be easily exchanged, are available. Additionally the sets of adapters include spare O-rings as well as a spanner, 32 flats and 14 flats, for exchanging the adapters.
Set of adapters: 1/4" BSP, 3/8" BSP, 1/2" NPT, M20 x 1.5
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Set of NPT adapters: 1/8" NPT, 1/4" NPT, 3/8" NPT, 1/2" NPT
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Angle connection 90°, for test specimens with back mounting connection
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Separator (without diaphragm), max. 1,000 bar
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Separator (to separate 2 liquid media by diaphragm), max. 700 bar
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Separator (to separate 2 liquid media by diaphragm), max. 1,200 bar
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Motorised piston drive unit for 700 bar, 1,200 bar and 1,400 bar measuring ranges (115...230 VAC, 50/60 Hz)
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Special test-item adapter with quick connect, for the matching to the quick-release system, operation as a comparison test pump possible
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Adapter for mounting piston-cylinder system into a quck-release mechanism
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Special operating fluid: hydraulic fluid based on mineral oil
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O-ring set consisting of 5 pcs. 8 x 2 and 5 pcs. 4 x 2.2 (for piston connector and test item connector)
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LDW-H Deadweight Tester Video
LDW-H Deadweight Tester Info/Data Sheet
Piston-Cylinder System
The piston-cylinder systems for the deadweight tester / pressure balance LR-Cal LDW-H are available in two fundamentally different designs, depending on measuring range:
- Single piston-cylinder system
Type LR-Cal LDW-H-EKZ
for measuring ranges 120 bar and 300 bar - Double piston-cylinder system
Type LR-Cal LDW-H-DKZ
for all higher pressure ranges (700 bar, 1,200 bar and 1,400 bar)
High accuracy over a wide measuring range
The dual-range piston-cylinder system LR-Cal LDW-H-DKZ offers two measuring ranges in one housing with automatic measuring range switching from low-pressuzre to high-pressure pistons. This provices the user with an extremely flexible measuring instrument that can cover a wide measuring range with high accuracy, with only one piston-cylinder unit and one set of weights. Additionally two test points can automatically be achieved by the operator loading masses once.The piston and cylinder are manufactured from hardened steel and tungsten carbide, respectively. This pairing of materials has very low pressure and temperature coefficients of expansion, which results in a very good linearity for the cross-sectional area and a very high accuracy.
Piston and cylinder are very well protected, against contact, impacts or contamination from outside, in a solid stainless-steel/hardened tool steel housing. At the same time, overpressure protection is integrated, which prevents the piston from being forced out vertically and avoids damage to the piston-cylinder system in the event of mass removal under pressure.
The masses are stacked directly onto the piston-cylinder shaft. This makes it easier for the operator to place the masses on and thus enables a lower start value.
The overall design of the piston-cylinder unit and the very precise manufacturing of both the piston and the cylinder, ensure exceptionally low friction force, which results in excellent operating characteristics with long free-rotation time and low sink rates. Thus a high long-term stability is unsured. Therefore the recommended recalibration interval is 5 years depending on the conditions of usage.
- Single piston-cylinder system
Standard Scope of Delivery
- Base with adjustable feet
- Priming pump
- Spindle pump for pressure generation and fine adjustment
- Piston connection with 3/4" BSP male thread
- Quick connector for test items with 1/2" BSP female threaded insert, changeable
- Piston-cylinder system
- Standard mass sets in carrying case
- Set of masses manufactured to standard gravity (9.80665 m/s²)
- Mineral oil bases hydraulic fluid (1.0 litre)
- Manual in Englisch and German language
- Factory calibration certificate, traceable to national standards
