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Deadweight Tester / Pressure BalancePneumatic, max.100 bar (1500 psi)
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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 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-P 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-P 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
Depending on the instrument version the pressure is set via an integrated pump or via an external pressure supply by the use of control valves. For fine adjustment a very precisely adjustable spindle pump with a precision spindle running only within the pump body is mounted.
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.

Deadweight Tester / Pressure Balance (Primary Pressure Standard),
pneumatic, Ranges from -0,03...-1 bar to 0,4...100 bar and -0,435...-14 psi to 5,8...1500 psi.
Total uncertainty of measurement
±0.008% or ±0.015% of measured value.


Primary standard for defining the pressure scale in a range up to 100 bar pneumatic
Reference instrument for calibration laboratories and factory for the testing, adjustment and calibration of pressure measuring instruments
Self-contained, complete, stand-alone system, also suitable for on-site use
Special features:

Total measurement uncertainty down to 0.008% of measured value
Factory calibration includes traceability to national standars, as standard. Optional with DAkkS calibration
High long-term stability with recommended recalibration cycle every 5 years
Masses manufactured from stainless steel and aluminium, local gravity adjustment possible at no additional charge
The optional quck-change system of piston-cylinder system enables fast and secure exchange of the piston-cylinder system in order to change the measuring range without tools.

Pressure range 1) bar -0.03...-1 0.03...2 0.2...10 0.4...50 0.4...100  
Required weights kg 5 10 10 10 20  
Smallest step 2) bar 0.01 0.01 0.05 0.25 0.25  
Nominal cross-sectional area of the piston cm² 5 5 1 0.2 0.2  
Pressure range 1) psi -0.435...-14 0.435...30 2.9...150 5.8...500 5.8...1000 5.8...1500
Required weights kg 5 10 10 7 13 20
Smallest step 2) psi 0.1 0.2 1 5 5 5
Nominal cross-sectional area of the piston cm² 5 5 1 0.2 0.2 0.2
Genauigkeit 3)  ±0.015% of measured value (optional: ±0.008% of measured value)
for ranges up to 10 bar integrated pressure source (priming pump and spindle pump)
for ranges from 20 bar, and Vacuum Pressure port for external pressure or vacuum supply
Connections / Media
Conection piston-cylinder system M20 x 2 male thread; Optional: quck-connector (required for Vacuum range)
Connection for test item Quick connector 1/2" BSP female thread as standard, freely rotating, changeable (for other threaded inserts, see accessories)
Pressure transmission medium clean dry non-corrosive gases (e.g. air or nitrogen)
Connection for external pressure/vacuum supply 6 mm SWAGELOK (R) tube fitting; max. 110% of the assigned measuring range; Only for pneumatic high-pressure version)
Piston Tungsten Carbide
Cylinder Tungsten Carbide
Set of masses Stainless steel 1.4305 and aluminium, non-magnetic
Piping in instrument base Low-pressure version: flexible hose from polyurethane, 4 x 0.75 mm
High-pressure version: stainless steel 1.4571, 3 x 1 mm
Operating conditions
Operating temperature °C 18...28
Instrument base kg 18.0 (19.0 incl. optional quick connector)
Piston-cylinder system kg 1.5 (5.7 incl. bell jar and aluminium plat in optional storage case)
BAR vacuum mass set kg 13.1 (incl. piston-cylinder system in storage case)
BAR basic mass set kg 16.2 (incl. storage case)
BAR mass set extension kg 14.0 (incl. storage case)
PSI vacuum mass set kg 13.0 (incl. piston-cylinder system in storage case)
PSI basic mass set kg 12.5 (incl. storage case)
PSI mass set extension 1 kg 11.0 (incl. storage case)
PSI mass set extension 2 kg 18.5 (incl. storage case) only for pressure range 1,500 psi
Instrument base mm W 400 x D 375 x H 265
Storage case for basic mass set mm W 400 x D 310 x H 310
Storage case for mass set extension mm W 215 x D 310 x H 310
Optional storage case for piston-cylinder system mm W 300 x D 265 x H 205
Calibration Factory certificate of calibration, traceable. Optional: DAkkS certificate
Order-Code Description Image

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

LDW-FMS-M1 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

CPB5000-ADS-NPT Set of NPT adapters: 1/8" NPT, 1/4" NPT, 3/8" NPT, 1/2" NPT  
CPB5000-WA90 Angle connection 90°, for test specimens with back mounting connection  
CPB5000-TV-1000 Purifier (without diaphragm), max. 1,000 bar, designed for measuring instruments (test items) where the fill fluid should not come into contact with the deadweight tester / pressure balance.  
CPB5000-R-SET Set of O-rings (5 pcs. 8 x 2 and 5 pcs. 4 x 2.2) for piston connector and test item connector  
CPB5000-PN-RS Cleaning set for LR-Cal LDW-P piston-cylinder system

For more information, click here!