Screw-type flow meters belong to the group of positive displacement flow meters. Two measuring spindles (pos. 2) with a screw-shaped profile engage with each other. They are low-friction mounted using roller contact bearings (pos. 3) and enclosed by a housing (pos. 1). The liquid flow causes the spindles to rotate and passes through the device in an axial direction. In so doing, self-contained part volumes are formed which are continuously filled and emptied.
This principle of measurement causes no pressure and/or flow pulsations.
A sensing wheel attached to the measuring spindle (pos. 4) is scanned by two non-contact sensors.
Using two sensors, a bidirectional flow with detection of flow-direction is possible. The inflow and outflow occurs almost without deflection.
Consequently, the device exhibits a relatively low drop in pressure. Measuring this way does not require the flow to be calmed at the inlet and outlet.
All moving parts are lubricated by the measurement medium.
• Very low pressure drop
• High-response measurement
• Measurement with changing flow direction
• pulsation free measurement principle
• High working pressure
• Very low noise emission
• Measurement independent of viscosity within the specified ranges
• High-precision measurement with outstanding reproducibility
• Temperature-independent output signals over a wide temperature range
• High degree of accuracy, even with low flow rates at the bottom end of the measuring range
• High working reliability of the electronics
• Easy to use terminal of the preamplifier