LR-Cal Kalibriergeräte / Calibration Equipment von / from DRUCK & TEMPERATUR Leitenberger - GERMANY

LR-Cal LDW-H Druckwaage / Kolbenmanometer - hydraulischDeadweight Tester
Pressure Balance

Model LR-Cal LDW-H

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

Description

Description model LR-Cal LDW-H:

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 DKD-/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 oil

As 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.

VIDEO

Piston-cylinder system

Piston-cylinder system of model LR-Cal LDW-H

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.

LR-Cal LDW-H-EKZ
Single piston-cylinder system
for pressure ranges 120 bar and 300 bar
Einzel-Kolbenzylindersystem der Druckwaage LR-Cal LDW-H
LR-Cal LDW-H-DKZ
Double piston-cylinder system
for all higher pressure ranges
Doppel-Kolbenzylindersystem der Druckwaage LR-Cal LDW-H

Specification

Set of masses for model LR-Cal LDW-H

The standard mass set is supplied in a wooden case with a foam insert. This includes the masses listed in the tables of masses in the datasheet (see DOWNLOADs), made from non-magnetic stainless steel, and optimised for everyday use. For finer increments and for a higher resolution, as an option, the standard mass sets can be extended by e set of fine increment weights LR-Cal LDW-H-FMS. If even smaller intermediate values need to be generated, using one of the class M1 or F1 trim-masses sets from the accessories is recommended.

Should you not operate the instrument under reference conditions (ambient temperature 20°C, air pressure 1,013 mbar, relative humidity 40%), the relevant corrections must be made.

The masses are manufactured, as standard, to the standard gravity (9.80665 m/s²) although they can be adjusted for any particular location.

The mass sets can be manufactured for the following different pressure units: bar, kg/cm², kPa, MPa or psi and can be used with the same piston-cylinder system.

Specification Piston-cylinder systems for model LR-Cal LDW-H

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

1) Theoretical starting value; corresponds to the pressure value generated by the piston or the piston and its make-up weights (bei their own weight). To optimise the operating characteristics more weights should be loaded.

2) The smallest pressure change value that can be achieved based on the standard weight set. To reduce this, a set of trim masses is also available.

3) The smallest pressure change value that can be achieved based on the optional fine increment weights. For further reductions, an accessory of class M1 or F1 trimm masses is available.

4) The accuracy from 10% of the measuring range is based on the measured value. In the lower range, the accuracy is 0.03% of reading for single-range piston-cylinder-systems and 0.025% of reading for dual-range piston-cylinder-systems.

5) Measuring uncertainty assuming reference conditions (ambient temperature 20°C, air pressure 1,013 mbar, relative humidity 40%).Corrections mus be made if required.

Technical data for basement model LR-Cal LDW-H

Base version
Hydraulic, standard, LR-Cal LDW-H-S   up to a max. 1,200 bar / 16,000 psi; with internal pressure generation
Hydraulic, high-pressure, LR-Cal LDW-H-H   up to a max. 1,400 bar / 20,000 psi; with internal pressure generation
Pressure transmission medium
Standard   Hydraulic fluid based on mineral oil
Optional   Sebacate oil, Brake fluid, Skydrol or Fomblin oil (dependant upon measuring range)
Fluid reservoir cm³ 250
Connections
Connection for piston-cylinder system   3/4" BSP male; optional: quick-release connector (not for 1,400 bar version)
Test item connector   1/2" BSP female quick connector as standard, freely rotating, changeable
(for other threaded inserts, see accessories)
Material
Piping in instrument base   Stainless steel  1.4404, 6 x 2 mm
Weight
Base"standard", LR-Cal LDW-H-S kg 18.0 (19.0 with optional quick-release connector)
Base "high-pressure", LR-Cal LDW-H-H kg 18.0
Optional storage case for basement kg 8.5
Permissible ambient conditions
Operating temperature °C 18...28
Dimensions
Base (both versions) mm W 400 x D 375 x H 265

Approvals and certificates for model LR-Cal LDW-H

  • CE-Conformity:
    Pressure equipment directive 97/23/EC (Module A)
  • Calibration:
    factory certificate of calibration, traceable
    Optional DKD-/DAkkS-certification

Scope of delivery and Options LR-Cal LDW-H

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

Options:

  • Other pressure transmission media
  • Piston connection with quick-release connector
  • System with increased accuracy to 0.006%
  • Other pressure units
  • Set of masses manufactured to local gravity
  • Fine increment weights
  • Storage case for the base and the piston-cylinder system
  • DKD/DAkkS or UKAS calibration certificate

Accessories

Accessories for model LR-Cal LDW-H

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

Feinmassensatz Klasse F1, Art.Nr. LDW-FMS-F1
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
Feinmassensatz Klasse M1, Art.Nr. LDW-FMS-M1
CPB5000-ADS

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 changed, are available:

Adapter set: 1/4" BSP, 3/8" BSP, 1/2" NPT and M20 x1.5

Additionally the sets of adapters include spare O-rings as well as a spanner with SW32 flats and SW14 flats, for changing the adapters. 

Gewindeadaptersatz für LR-Cal LDW-H Druckwaage
CPB5000-ADS-NPT Adapter set "NPT": 1/8" NPT, 1/4" NPT, 3/8" NPT and 1/2" NPT  
LDW-PAS-G12 Test item connecting piece, 3/4" BSP female to 1/2" BSP female, free-rotating, operation as a comparison test pump is possible (---> base unit with 2 test item connectors) Anschlussstück G 3/4 innen auf G 1/2 innen, zur Umrüstung der LR-Cal LDW-HK auf eine Vergleichsprüfpumpe
CPB5000-WA90 90° angle connection, for test items with back mounting connection 90°-Winkelanschlussstück für Prüflinge mit Anschluss hinten
CPB5000-TV-1000 Separator (without diaphragm), max. 1,000 bar  
LDW-TV-M-0700 Separator (to separate 2 liquid media by diaphragm), max. 700 bar Trennvorlage (mit Membrane), max. 700 bar
LDW-TV-M-1200 Separator (to separate 2 liquid media by diaphragm), max. 1,200 bar Trennvorlage (mit Membrane), max. 1200 bar
CPB5000-R-SET O-ring set consisting of 5 pcs. 8 x 2 and 5 pcs. 4 x 2.2 (for piston connector and test item connector) O-Ring Set für LR-Cal LDW-H Druckwaage
CPB5000-FLUID Special operating fluid: hydraulic fluid based on mineral oil  
LDW-H-KA Adapter for mounting piston-cylinder system into a quck-release mechanism  
LDW-PAS-G12-CT Special test-item adapter with quick connect, for the matching to the quick-release system, operation as a comparison test pump possible  
LDW-H-E-230 Motorised piston drive unit for 700 bar, 1,200 bar and 1,400 bar measuring ranges (115...230 VAC, 50/60 Hz) LDW-H-E-230 Motorised piston drive unit for LR-Cal LDW-H deadweight tester - pressure balances 

DOWNLOADs

Datasheet and Manual for Deadweight Tester LR-Cal LDW-H

Note:
Datasheet and Manual can be downloaded as PDF files. To open PDF files, you need the ADOBE READER. You can get this software free of charge from ADOBE.

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LR-Cal Leitenberger Kalibriersysteme
is a trade mark of
DRUCK & TEMPERATUR
Leitenberger GmbH

for calibration equipment
Pressure & Temperature.

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