Senseca VHS-025GAXA0140VE Flow Transmitter

Flow TransmitterFlow Transmitter / Screw Volumeter VHSTechnical data Sensor Nominal width Process connection Metering ranges Measurement accuracyRepeatability Pressure resistancePressure loss Measures and monitors viscous media (oil) 1.4..2500 l/min Connection G 1..G 21/2Very low dependence on viscosity Can be used up to 40,000 mm²/s (cSt) Linear frequency output (push-pull)Light and compact device (aluminium housing) Operation and measurement possible with forwards andreverse flow ● For cost-sensitive applications● ● ● ● ● ● ●Medium Medium temperature Materials mediumcontactscrew volumeterDN 25..65 female thread G 1..G 21/2 see table "Ranges" ±1 % of the measured value(at 20 mm²/s, (cSt) of 1 %..100 % nominal working range (see also diagram in upstream pages)±0,25 % Connection SAE PN material flange bar aluminium without 160 aluminiumwith 350 steel without 350 steel with 350 others available on request see diagrams inupstream pages oil or non-aggressive self-lubricating fluids -25..+80 °C (150 °Cavailable on request) (special materials available on request):Characteristics The VHS flow transmitter measures the flow using the volumetricprinciple, and is suitable for fluid, viscous, lubricant media (e.g.lubricating oil). If the material for the VHS is selected appropriately,aqueous fluids such as soaps, pastes, and emulsions with nonabrasive characteristics can also be measured, as long as theyhave sufficient lubricity. Because of the volumetric functioning principle, the device is almost completely independent of viscosity.The VHS system consists of two interlacing screws which run in opposite directions, driven by the flowing medium. A magneticallypre-tensioned Hall sensor positioned outside the flow space detects the screw flanks, and creates a frequency signal proportional to theflow. Here, two pulses correspond to one revolution of the screws, and therefore to a specific measured volume (see data table) Thereare no magnets in the flow space. A push-pull transistor output, an A / B output or a two wire output are available as signal output. Thepush-pull output can as desired be switched as a PNP or an NPN output, and emits a frequency proportional to the flow rate.The A / B output consists of two push-pull outputs, whose signals are phase-shifted by 90 °. This makes it possible to determine thedirection of flow using the bidirectionally driven sensor.The 2 wire model represents the pulse as two different currents, and has the advantage of reduced wiring effort. Alternatively, it ispossible to use add-on electronics with signal processing, in the series OMNI, FLEX and LABO.The device bodies are made of aluminium, and the connections either of aluminium (achieves PN 160 bar) or steel (achieves PN350 bar). Optionally, both process connections can be fitted withSAE flanges, which simplify the installation in the pipework, and in both cases achieve a pressure resistance of PN 350.dsh_fam_vhs_en_vs01 V1.01-001. Body2. Connections:3. Main screw4. Subsidiary screw5. Ball bearing6. Ball bearing7. Screws8. O-ring9. Seeger ring10. Seeger ring11. O-ring12. SAE connection13. SAE flange14. O-ring15. Screws16. Sensor spacer 3 wire Supply or voltage A / BCurr.output consumpt.Signal outputAluminium 6082 anodised Aluminium 6082 anodised or steel Steel 35SMnPb10 UNI 4838-80GHISA GJL-250 EN1561 Steel Steel Galvanised steel NBR Steel Steel NBRASTM A216WCBASTM A216WCB NBR Galvanised steel Aluminium 6082 anodised 10..30 V DC approx. 20 mA without loadTransistor output "push-pull" (resistant to short circuits and reversed polarity protected)lout = 100 mA max.1