The VHZ gearwheel flow meter measures the flow by a volumetric principle, in which a pair of gearwheels is moved proportional to the flow rate. The movement of the gearwheels is measured through the enclosing housing wall by a sensor. The devices are suitable for viscous, fluid, self-lubricating media, as well as for aqueous fluids such as soaps, pasts, emulsions etc. which have a non-abrasive character.
Because of the volumetric functioning principle, the devices are almost completely independent of viscosity. A push-pull transistor output, an A / B output or a two wire output are available as signal output.
The push-pull output can as desired be connected 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 the direction 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.
Sensor : gearwheel volumeter
Nominal width : DN 8..25
Process connection : female thread G 1/4..G 1
Metering ranges : 0.02..150 l/min
Measurement accuracy : specified range ±3 %
Repeatability : ±0.3 %
Medium temperature : -25..+80 °C
Ambient temperature : -20..+70 °C
3 wire or A / Boutput : 10..30 VDC
2 wire : 4.5..24 V DC
Ingress protection IP 65
Ideally suited for viscous media (oils)
Light and compact construction in an aluminium housing
For cost-sensitive applications