Maintenance, Test & Measurement, Calibration


Hydraulic deadweight tester for pressure instruments

October 2015 Maintenance, Test & Measurement, Calibration

Deadweight testers are an accurate method for the calibration of electronic or mechanical pressure measuring devices. Instrotech offers the LR-Cal LDW series of deadweight testers, which are available in the ranges from 10 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 are ideally suited to on-site use as well as for service and maintenance purposes. The customised assembly allows set 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 small temperature co-efficiency. 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 excellent 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 tester, Instrotech can supply the Keller Leo2 which offers accuracies up to 0,1%. An intrinsically safe version is also available.



Credit(s)



Share this article:
Share via emailShare via LinkedInPrint this page

Further reading:

Collect data three times faster
SKF South Africa Maintenance, Test & Measurement, Calibration
SKF has extended its renowned Microlog Analyzer family of data collection devices with the addition of the Microlog Analyzer dBX. Currently SKF’s most powerful diagnostic tool, this cutting-edge device redefines diagnostic capabilities, enabling users to take measurements three times faster than its predecessor.

Read more...
The criticality of maintenance in the water and wastewater segment
Schneider Electric South Africa Maintenance, Test & Measurement, Calibration
In a time of water shedding, climate change and ageing infrastructure, the importance of maintenance and support in the water and wastewater segment cannot be overstated.

Read more...
How dry ice blasting is revolutionising the mining industry
Maintenance, Test & Measurement, Calibration
Dry ice blasting has emerged as a game-changing technology for the mining industry, offering a range of advantages that are reshaping traditional cleaning methods.

Read more...
Wind turbines with smart sensors
Instrotech Motion Control & Drives
The wind’s usable kinetic energy increases with the wind speed. Wind turbines, therefore, use kinetic energy to generate torque and then rotational movement. The rotor, consisting of three rotor blades, ...

Read more...
Infrared camera for condition monitoring and early fire detection
Instrotech Temperature Measurement
The Optris PI 640i thermal imager is the smallest measuring VGA infrared camera, with a body-sized volume of 45 x 56 x 90 mm, and weighing only 269 to 340 g, depending on the lens. It counts among the most compact thermal imaging cameras on the market.

Read more...
Pressure monitoring for oil and water tempering machines
Instrotech Pressure Measurement & Control
Temperature plays a significant role in many manufacturing processes. In such cases, a tempering machine is used to maintain the manufacturing process at the desired temperature. Keller supplied PR-21Y piezoresistive pressure transmitters to a client specialising in developing and producing oil and water tempering machines.

Read more...
The logical solution to oil and gas industry corrosion
Maintenance, Test & Measurement, Calibration
The consequences of corrosion in the oil and gas industry can be astronomical. The simple culprit is metal reacting with oxygen and moisture, degrading it back to its natural state.

Read more...
Lube tip: foaming is affected by oil level
Wearcheck Maintenance, Test & Measurement, Calibration
In a circulating system, it is crucial to check the oil level before introducing anti-foam agents to address a foaming problem.

Read more...
Temperature monitoring in the metal casting process
Instrotech Temperature Measurement
During metal casting, the liquid material is poured into a mould, and after solidification becomes a solid body. Both too-high and too-low casting temperatures can lead to quality defects. The compact Optris PI 05M infrared thermal imaging camera from Instrotech can monitor the casting process.

Read more...
Microfine filtration boosts fuel quality and reduces equipment failure
Maintenance, Test & Measurement, Calibration
The path to contamination-free fuels relies on a combined effort from refiners to transporters, storage depots, handlers and end users. Prior to use, fuels can be polished with multi-pass microfine filtration systems such as those exclusively manufactured by ISO-Reliability Partners.

Read more...