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Deadweight Tester / Pressure BalanceHydraulic, max. 1400 bar (20000 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 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

Deadweight Tester (Pressure Balance, Primary Standard for Pressure), single-piston and double-piston versions, hydraulic, pressure ranges from 1...120 bar to 1...1,400 bar and 10...1,600 psi to 10...20,000 psi.
Accuracy (measurement uncertainty) to ±0.006% or to ±0.015% of measured value.

Applications:

Primary standard for defining the pressure scale in a range up to 1,400 bar hydraulic
Reference instrument for calibration laboratories and factory for the testing, adjustment and calibration of pressure measuring instruments
Complete, stand-alone system, also suitable for on-site use
Special features:

Total measurement uncertainty to 0.006% of measured value
Dual-range piston-cylinder system with fully automated changing between ranges
Factory calibration includes traceability to national standars, as standard. Optional with UKAS or DKD/DAkkS calibration
High long-term stability with recommended recalibration cycle every 5 years
Fast and safe replacement of the piston-cylinder system via quick-release system as an option

Single piston measuring ranges:

Measuring Range 1) bar, kg/cm² 1...120 2...300
Required masses kg 49.7 49.6
Smallest step 2) standard set of masses bar, kg/cm² 0.5 2.5
Smallest step 3) optional fine increment weights bar, kg/cm² 0.02 0.05
Nominal cross-sectional area of the piston cm² 0.4032 0.1613
Measuring Range 1) psi, lb/in² 10...1,600 30...4,000
Required masses kg 45.5 45.3
Smallest step 2) standard set of masses psi, lb/in² 5 20
Smallest step 3) optional fine increment weights psi, lb/in² 0.2 0.5
Nominal cross-sectional area of the piston cm² 0.4032 0.1613
Measuring Range 1) kPa 100...12,000 200...30,000
Required masses kg 49.7 49.6
Smallest step 2) standard set of masses kPa 50 250
Smallest step 3) optional fine increment weights kPa 2 5
Nominal cross-sectional area of the piston cm² 0.4032 0.1613
Accuracy
Standard 4) 5) % of
measured
value
0.015 0.015
Optional 4) 5) % of
measured
value
0.007 0.006
Pressure transmission medium
Standard Hydraulic fluid based on mineral oil
Optional

Sebacate oil
Brake fluid
Skydrol
Fomblin oil

Material
Piston   Steel Steel
Cylinder   Bronze Steel
Set of masses Stainless steel, non-magnetic
Weights
Piston-cylinder system kg 1 0.8
Storage case for piston-cylinder system kg 3.1 3.1
"bar" standard mass sets (in 2 wooden cases) kg 61.3 61.2
"psi" standard mass sets (in 2 wooden cases) kg 57.1 56.9
Optional "bar" fine increment masses kg 0.33 0.5
Optional "psi" fine increment masses kg 0.23 0.34
Dimensions
Carrying case for standard mass sets mm W 400 x D 310 x H 310
Optional storage case for piston-cylinder systems mm W 300 x D 265 x H 205

Double piston measuring ranges:

Measuring Range 1) bar, kg/cm² 1...60 / 10...700 1...60 / 20...1.200 1...60 / 20...1.400
Required masses kg 57.4 49.2 57.4
Smallest step 2) standard set of masses bar, kg/cm² 0.5 / 5.0 0.5 / 10 0.5 / 10
Smallest step 3) optional fine increment masses bar, kg/cm² 0.01 / 0.1 0.01 / 0.2 0.01 / 0.2
Nominal cross-sectional area of the piston cm² 0.8065 / 0.0807 0.8065 / 0.0403 0.8065 / 0.0403
Measuring Range 1) psi, lb/in² 10...800 / 100...10,000 10...800 / 200...16,000 10...800 / 200...20,000
Required masses kg 56.4 45 56.4
Smallest step 2) standard set of masses psi, lb/in² 5 / 50 5 / 100 5 / 100
Smallest step 3) optional fine increment masses psi, lb/in² 0.1 / 1 0.1 / 2 0.1 / 2
Nominal cross-sectional area of the piston cm² 0.8065 / 0.0807 0.8065 / 0.0403 9.8065 / 0.0403
Measuring Range 1) kPa 100...6,000 / 1,000...70,000 100...6,000 / 2,000...120,000 100...6,000 / 2,000...140,000
Required masses kg 57.4 49.2 57.4
Smallest step 2) standard set of masses kPa 50 / 500 50 / 1,000 50 / 1,000
Smallest step 3) optional fine increment masses kPa 1 / 10 1 / 20 1 / 20
Nominal cross-sectional area of the piston cm² 0.8065 / 0.0807 0.8065 / 0.0403 0.8065 / 0.0403
Accuracy
Standard 4) 5) % of
measured
value
0.015 0.015 0.025
Optional 4) 5) % of
measured
value
0.006 0.007 0.007
Pressure transmission medium
Standard Hydraulic fluid based on mineral oil
Optional

 

Sebacate oil
Brake fluid
Skydrol
Fomblin oil
Sebacate oil
Brake fluid
Skydrol
Fomblin oil
Sebacate oil
Material
Piston   Tungsten carbide / steel Tungsten carbide /steel Tungsten carbide / steel
Cylinder   Steel / Tungsten carbide Steel / Tungsten carbide Steel / tungsten carbide
Set of masses Stainless steel, non-magnetic
Weight
Piston-cylinder system kg 2 2 2
Storage case for piston-cylinder system (optional) kg 3,1 3,1 3,1
"bar" standard set of masses (in 2 wooden cases) kg 69 60,8 69
"psi" standard set of masses (in 2 wooden cases) kg 68 56,6 68
Optional "bar" fine increment masses kg 0,5 0,5 0,5
Optional "psi" fine increment masses kg 0,34 0,34 0,34
Dimensions
Carrying case for standard mass sets mm B400 x T310 x H310
Optional storage case for piston-cylinder systems mm B300 x T265 x H205
Order-Code Description Image
LDW-FMS-F1

The weights included in the standard mass set or fine inrement weights are ideally suited for every day use. If smaller intermediate values need to be generated, we recommend using a set of trim masses.

Trim mass set, 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 Trim mas set, 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