Stainless steel Woltmann turbine flow meter for high pressures up to 630 bar

Stainless steel turbine flow meter based on the Woltmann principle, designed for pressures up to 630 bar and temperatures up to 350 °C in the high-temperature version. Each instrument is calibrated and supplied with its own calibration report. Rotation is sensed without contact by an inductive pick-up.

Features

• Measuring ranges from 0.3…1.5 l/min up to 35…400 l/min (water)
• Linearity ±1% of reading
• Viscosity range 1…10 mm²/s
• Maximum pressure 630 bar, maximum temperature 120 °C (350 °C depending on version)
• Female connections from G ¼ to G 1½
• Pulse output

Operating principle

A low-mass rotor is mounted on bearings, concentric with the meter tube. The liquid passes axially through the turbine after being conditioned by a flow straightener, so it reaches the blades in a nearly laminar state. The rotational speed is proportional to the mean flow velocity and therefore to the volumetric flow rate over a wide range. An inductive pick-up screwed into the body senses the rotation without contact; the signal is amplified and converted into pulses whose frequency is proportional to the flow rate. The specific viscosity of the application can be taken into account during calibration.