Kobold LFM Dual-Ring Piston-Pendulum-Flowmeter Low Volume

Measuring range: 0.005 – 0.25 l/min water
Connection: G ⅛ female thread and swagelock 6 mm
Material: stainless steel
p_max: 100 bar
t_max: 70 °C
Accuracy: ±2.5 % of reading
Pulse output

Areas of Application
The LFM is a new KOBOLD flow rate measuring transducer suitable for use in filling and batching processes with all types of low viscosity liquids. It can be used for extremely low volumetric flow rates >0.005 l/min.

Method of Operation
The measuring mechanism is based on a dual-ring piston pendulum. The right-hand measuring chamber is opened, and the left-hand chamber closed, by the pendulum arm that is inclined to the right. The pressure of the forced liquid acts on the upper surface of the piston pendulum. The right-hand ring piston is pressed clockwise downwards, and the lefthand ring piston is pressed clockwise upwards by the larger surface (opened measuring chamber) on the right.

Thus the right-hand measuring chamber is closed, and the left-hand chamber opened. The surface on the left is now greater-causing motion in the opposite direction. This cycle is repeated with continuous flow at a rate proportional to the flow rate 1…230 cycles/s.

A volume of approximately 0.01 cm3 is displaced per pass.

The built-in carrier frequency transducer senses the oscillating motion of the piston pendulum and pendulum arm without contact through the case, and outputs a digital signal with a frequency proportional to the volumetric flow.

Due to the negligible pendulum mass and minimum friction loss, the LFM detects minimum volumetric flow rates.

Leakage loss is minimised by the piston design, which also provides good linearity and repeatability.

Typical Applications

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