This version of the LDW-HK Deadweight Tester has 0.05% Uncertainty of Measured Value and Ranges are in PSI.

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-HK 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-HK 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 UKAS (DAkkS)-calibrated.

Easy operation
The integrated dual-area spindle pump enables rapid filling of the test system and smooth pressure generation up to 1,200 bar. At the same time, the precise adjustable spindle pump also serves for fine pressure adjustment. A control schematic for pressure generation on the instrument base facilitates quick and easy operation.

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.

Compact instrument design
The LR-Cal LDW-HK is also particularly notable for its compact dimensions, which are not altered during operation, since the spindle runs within the pump body.
With its compact dimensions, the exceptionally robust ABS plastic housing and the low weight associated with these, the LR-Cal LDW-HK is also particularly suited to on-site applications.

This item comes with a one year warranty from the manufacturer.

Please allow 3-4 weeks lead time for this new product to arrive.

*This tester ships via freight on a pallet ~80kg, please contact us for a quote.*

LR-Cal LDW-HK Hydraulic Deadweight Tester Pressure Balance 0.05% 16000 PSI

PSI Ranges

Quantity

Available Accessories
1. 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
2. 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
3. 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
4. Set of NPT adapters: 1/8" NPT, 1/4" NPT, 3/8" NPT, 1/2" NPT
5. Angle connection 90°, for test specimens with back mounting connection
6. Separator (without diaphragm), max. 1,000 bar
7. Separator (to separate 2 liquid media by diaphragm), max. 700 bar
8. Separator (to separate 2 liquid media by diaphragm), max. 1,200 bar
9. Motorised piston drive unit for 700 bar, 1,200 bar and 1,400 bar measuring ranges (115...230 VAC, 50/60 Hz)
10. Special test-item adapter with quick connect, for the matching to the quick-release system, operation as a comparison test pump possible
11. Adapter for mounting piston-cylinder system into a quck-release mechanism
12. Special operating fluid: hydraulic fluid based on mineral oil
13. O-ring set consisting of 5 pcs. 8 x 2 and 5 pcs. 4 x 2.2 (for piston connector and test item connector)
LDW-HK Deadweight Tester Info/Data Sheet
Data Sheet
Piston-Cylinder System
The piston and cylinder of model LR-Cal LDW-HK Deadweight Tester / Pressure Balance are manufactured from tungsten carbide.
This pairing of materials, in comparison to other 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 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 on an overhang (bell jar), which sits on the piston shaft. The construction of the overhang (bell jar) provides a very low centre of gravity for the stacked weights, which minimises both the side thrust on the piston-cylinder system and the friction. For smaller starting pressures, the masses can also be stacked directly onto the piston shaft, without using the overhang (bell jar).

The overall design of the piston-cylinder unit and the very precise manufacturing of both the piston and cylinder, ensures excellent operating characteristics with long free-rotation time and low sink rates.
Thus a high long-germ stability is ensured. Therefore the recommended recalibration interval is 5 years depending on the conditions of usage
Standard Scope of Delivery
- Base, with adjustable feet
- Dual-area spindle pump for filling, pressure generation and fine adjustment
- Piston connection with 3/4" BSP male thread
- Test item connection with 1/2" BSP female thread, loose union connection
- Adapter set for test item connection, 1/2" BSP male to 1/4" BSP female and to 3/8" BSP female
- Piston-cylinder system with overhang (bell jar)
- Set of masses manufactured to standard gravity (9.80665 m/s²)
- Tool and maintenance set
- Manual in English and German language
- Factory calibration certificate, traceable to national standard