Pressure Measurement & Control


Hydraulic deadweight tester for pressure instrument calibration

March 2022 Pressure Measurement & Control Maintenance, Test & Measurement, Calibration

Deadweight testers are accepted as the most accurate method for the calibration of electronic or mechanical pressure measuring devices. Instrotech is offering the LR-Cal LDW series of deadweight testers, which are available in ranges from 10 bar up to 1400 bar.

The direct measurement of pressure (according to its definition as a quotient of force and area) ensures high accuracies and long-term stability. These testers are used extensively in calibration laboratories in industry, standards institutes and research facilities.

The LDW series is ideally suited to on-site use as well as for service and maintenance purposes. The customised assembly allows for the setting up of a complete, compact system consisting of a universal basement and the measuring systems (piston/cylinder units). The high-quality piston/cylinder units are manufactured from tungsten carbide, which is known for its low temperature coefficient of expansion. Fast and uncomplicated changes of the measuring range are possible using a flat spanner.

In order to generate the individual test points, the piston/cylinder system is weighted with mass loads which are also calibrated and specially adapted to the required application. The basement is fitted with the corresponding system, depending on the measuring range of the device under test. The pressure is set via an integrated pump or, if an external pressure supply is available, via control valves (pneumatic models).

For fine adjustment, an adjustable volume with precision spindle is available. The weight applied is proportional to the desired pressure and provided by using optimally graduated weights. As soon as the measuring system reaches equilibrium, there is a balance of forces between pressure and wheel weights. Due to the high quality of the system, this pressure remains stable over several minutes so that, for instance, adjustments of the device under test can be carried out without any problems.

For users who require a digital pressure display for connection to the deadweight tester, Instrotech can supply the Keller Leo2 that offers accuracy of 0,1%. An intrinsically safe version is also available.


Credit(s)



Share this article:
Share via emailShare via LinkedInPrint this page

Further reading:

IO-Link transmitter for sanitary pressure monitoring
Morton Controls Pressure Measurement & Control
This temperature-compensated transmitter is ideal for sanitary pressure monitoring in a variety of applications in breweries, dairies and the beverage industry.

Read more...
Magnetic-inductive flow meter for phosphate precipitation
Instrotech Flow Measurement & Control
With a 4-20 mA signal or optional pulse output, the MIK allows for immediate response to the latest process conditions.

Read more...
Pressure sensors for hygienic applications
ifm - South Africa Editor's Choice Pressure Measurement & Control
ifm’s new PI1xxx series offers measuring ranges from vacuum to 100 bar, communication via IO-Link 1.1, and resolution close to 20 000 steps.

Read more...
Pressure transmitters for mobile machines
Pressure Measurement & Control
The thin-film measuring cell of the sensor is directly welded to the process connection and features high measuring accuracy and a short response time.

Read more...
Compact infrared camera for the metal industry
Instrotech Temperature Measurement
The camera’s wide temperature measurement range of 450-1800°C satisfies practically all demands in the fields of metal production and processing.

Read more...
3-point pressure calibration in 10 seconds
WIKA Instruments Pressure Measurement & Control
WIKA’s CPC3050 comes in high-pressure and low-pressure versions with customisable ranges, a 10:1 range limit ratio and auto-ranging.

Read more...
Wire-actuated encoder for crane arms and lifting platforms
Instrotech Sensors & Transducers
Siko has solved the challenges presented by such applications with the SG 30 and its very compact, yet robust, design.

Read more...
Pressure transmitters for mobile machines
ifm - South Africa Pressure Measurement & Control
ifm electronic’s PT/PU-type sensors offer high vibration and shock resistance, a high degree of protection, and very good EMC resistance.

Read more...
Flow meters and switches for very slow flows
Instrotech Flow Measurement & Control
Kobold’s KSV meters are shock resistant, small, lightweight and simple to install for measuring liquid or air flow with full-scale accuracy within +/-6%.

Read more...
Five reasons for force measurement
WIKA Instruments Editor's Choice Maintenance, Test & Measurement, Calibration
Wika takes a closer look at the measured variable of force and gives five reasons to show why force measurement is of particular importance.

Read more...