Cost-sensitive flow measurement in oil circuits needs a sensor that keeps readings stable even when viscosity is high. The VHS measures liquid, viscous and lubricating media such as lubricating oil from 1.4...1,500 l/min, using a volumetric screw principle with very low viscosity dependence and suitability up to 40,000 mm²/s (cSt).
Two intermeshing screws rotate with the flowing medium, while a Hall sensor outside the flow chamber detects the screw flanks and generates a flow-proportional frequency signal. This gives operators a clear pulse output for monitoring and control, with Push-Pull, A/B or 2-wire versions available. The A/B output also supports direction detection for bidirectional operation.
The aluminum housing keeps the device compact for machine and plant integration. G 1...G 2 connections cover DN 25...50 sizes, with SAE flange options for easier installation and pressure resistance up to PN 350.
Two intermeshing screws rotate with the flowing medium. The volumetric measuring principle generates a flow-proportional pulse frequency, with two pulses corresponding to one screw revolution.
A magnetically biased Hall sensor is positioned outside the flow chamber and detects the screw flanks. No magnets are located in the flow chamber.
The device is intended for liquid, viscous and lubricating media such as lubricating oil. With suitable material selection, it can also measure water-based, non-abrasive soaps, pastes and emulsions with sufficient lubricity.
The Push-Pull transistor output can be wired as PNP or NPN. The A/B version provides two phase-shifted Push-Pull outputs, while the 2-wire version represents pulses through two different current levels.
Electrical connection is available via DIN 43650-A / ISO 4400 plug or 4-pin M12x1 round connector, depending on the selected output version.
OMNIPLUS and LABOPLUS add-on electronics with signal conditioning can be used as an alternative to the standard pulse electronics.
