Liquid flowmeters and controllers of the L and LC series use two of the best-studied physical properties of liquids to measure flow: Viscosity and Pressure. Differential pressure measurement, across a laminar flow element, results in a flowmeter that is inherently linear. The flow meter measures differential pressure within that laminar region to achieve a turndown of 50:1 typical.

The L Series is a Volumetric Flowmeter. The unique method of flow detection allows the unit to measure extremely low flow rates at an affordable price. These flowmeters are available in ranges of 500 micro-liters per minute full scale to 10 liters per minute full scale. Units are suitable for low viscosity, non-aggressive liquids.

The LC Series Flow Controller utilized a proportional valve coupled to a flowmeter body creating a unique in-situ closed-loop flow controller system. Measurements are taken within the laminar region of the flow meter and the integral PID controller positions the valve according to the flow set points. These robust, closed-loop devices accept a selectable digital or analog control set point from either direct entry on units with local display or external devices. The controllers can also accept an RS-232, 0-10Vdc or 4-20mA control input signal depending on what is preferred by the customer. Independent of the set point voltages, the controllers can be configured for single or dual output of the same or different voltages and/or different parameters such as temerature and flow. This is possible because of the laminar flowmeter design which incorporates solid-state Differential, Absolute Pressure, and Temperature sensors to determine flow in an inherently linear system. The result is a fast responding linear flow meter with multiple outputs. All these parameters are simultaneously visible with our dynamic display that includes a push button operator interface. Liquid controllers are available from 500 micro-liters per minutes full scale to 500 milliliters per minute full scale.

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