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The historic problem of flow test systems, especially for high flows, deals with keeping the
reference pressure regulated according to the wanted one while the flow changes.
The flow measurement depends directly (but not linearly) on the pressure and because of charge loss, we have to consider as pressure value the pressure at the entrance of the piece and not the one generated inside the piece.
In the past almost all leak and flow test producers tried to solve this by separating the connecting tubes to the piece between flow and pressure measurement in order to obtain at least a real pressure datum (even if not regulated) and by correcting through the software the eventual charge loss of connection tubes through correlation calculations.
The limits of this method are (especially with high charge loss -> 5 Lt/min) in the non linearity of flow/pressure.
Moreover in deforming pieces, where the pressure value modifies the matched flow value (packaging, filters, valves … and every piece which is not really rigid) this correlation changes drastically the wanted measurement value.
Through new proportional techniques about electronics and algorithm able to take a picture of the flow value (only at wanted values of pressure), the RFO techniques is a warranty of doing tests at the flow and pressure values you set.
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The leak detector ET97W represents the best solution on the market in terms of precision, flexibility and execution speed of seal tests with measure in flow rate.
This instrument allows to measure in a direct way the air flow generated by the leak-off rate.
ET97W is composed of a pneumatic circuit optimized in order to reduce the filling times, of a mass flow sensor, of a pressure
sensor and of an electronic pressure regulator, that guarantees stable and safe test pressures without the operator assistance.
The instrument detects the leaks through continuous seal measure of the pressurized piece, this method allows to reduce
drastically the time of the test phase.
ET97W is specially used in seal tests where the volume of the piece is unknown and variable (oil motors, elastics bags or
bottles), when the leak entity is so elevated that a Äp system does not succeed to maintain constant the test pressure (cartridge valves, oil distributors, between filaments) and finally when is requested a continuous leak measurement in order to allow the operator to look for and repair the same one.
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The Webster DHM 3 Series Digital Hydraulic Multimeter is an all-in-one unit designed to test the performance of hydraulic pumps, motors, valves and hydrostatic transmissions.
The easy-to-use design allows the operator to just switch on and test, without complex setup or special training.
The DHM measures flow, pressure and temperature. In addition, the DHM holds the peak pressure value as well as calculating hydraulic power and volumetric efficiency using the unique P-Q test button.
The DHM is the ideal tool for pinpointing hydraulic system faults, reducing downtime, and helping in preventative maintenance. The design builds on the very successful Webster DHT range of portable testers with the addition of a large digital display and a built-in pressure transducer.
The turbine flow meter with built-in loading valve is bi-directional and specifically designed to enable the operator to simulate the maximum working pressure safely during normal machine operation.
The loading valve has safety discs built-in to protect the operator and the multimeter in the event of excessive pressure, allowing oil to bypass the loading valve INTERNALLY with no spillage of oil from the hydraulic circuit, eliminating any danger to the operator or environmental hazards.
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The Webster HT 2 Series Analogue Hydraulic Testers are designed for testing hydraulic pumps, motors, valves and hydrostatic transmissions. This easy to use diagnostic unit can pin point hydraulic system faults, reducing downtime and help in preventive maintenance.
Accurately measuring flow, pressure and temperature, testers are ideal for conveniently checking, hydraulic system performance or locating faults while operating directional control valves or adjusting valve settings. Webster turbines are designed for continuous monitoring or intermittent use commissioning and servicing hydraulic systems up to 480 bar, 7000 psi pressure.
The pressure loading valve with internal by-pass safety discs, allows progressive build up of pressure to check the flow throughout the working range.
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The Webster DHT 1 Series Digital Hydraulic Testers accurately measure flow, pressure and temperature. Webster testers are designed to conveniently check the performance of hydraulic pumps, motors, valves and hydrostatic transmissions.
This easy to use diagnostic tester has simplified controls and can pin-point hydraulic system faults, reducing downtime and helping in preventive maintenance. The tester comprises a turbine flow block and a large easy to read digital display which indicates both flow and temperature.
The tester has a built-in loading valve to simulate the working pressure during normal machine operation. The built-in safety discs protect the machine and operator in event of excessive pressure, allowing oil to safely bypass the loading valve INTERNALLY with no spillage of oil from the hydraulic circuit, eliminating clean-up costs and environmental hazards.
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The PFM6 Series is a compact, lightweight digital
portable tester designed for fast diagnostic
troubleshooting of all types of mobile or
stationary hydraulic systems and components.
These self-contained testers feature laboratory
accuracy and provide fl ow, pressure and
temperature measurements simultaneously
from one point.
Carrying handle for improved portability
Bi-directional model available
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DELTA F is an electro-pneumatic equipment able to measure the air flow rate and the generated pressure through the piece in test.
The output pressure control assure the test is always performed on the same condition.
The equipment can be used manually or managed by a PLC or Personal Computer.
So it can be used also with automatic system in every industrial situation.
* 16 programmable test parameters tables: each table includes all the parameters defining a test cycle so it is easy to make predefined test setting for different products
* Selectable pressure measurement units
* Selectable flow measurement units
* Selectable languages for display messages
* Print out of customized test report (with external RS-232 printer)
* RS422 serial line MODBUS protocol for PC supervisory system
* Opto-isolated interface with PLC
* An aided procedure making it possible to calibrate the pressure sensor
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