Liquid Flow Meters and Controllers





L & LC-Series Features

  • Response time of 20 milliseconds typical (Meter)
  • Turndown Ratio of 100:1
  • Push Button Tare (with display)
  • Accuracy of +/-2% full scale
  • Local Control Capable
  • Flow range: 0.005 10 SLPM
  • Analog & Digital I/O
  • Dynamic Display with push button operator interface
  • 303 and 304 Stainless Standard Materials
  • NIST Traceability
  • Flow control systems add the ease of 'dialing in' the flow with optional Local Set Point Module


The L and LC series flow meters and controllers use two of the best-studied physical properties of liquids to measure flow: Pressure and Viscosity. Differential pressure measurement, across a laminar flow element, results in a flow meter that is inherently linear. These flow meters measure differential pressure within that laminar region to achieve a turndown ratio of 100:1 typical.


The L Series is a Volumetric Water Flow meter. The unique method of flow detection allows the measure of extremely low flow rates at an affordable price. The L Series was designed with De-Ionized water in mind. These flow meters are available in ranges of 500 micro-liters per minute full scale to 10 liters per minute full scale.


The LC Series Flow Controller utilizes a proportional valve coupled to a flow meter 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 analog or digital control set point from external devices. The controllers can 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 temperature and flow. This is possible because of our laminar flow meter design that 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 50 milliliters per minute full scale to 500 milliliters per minute full scale. Please see our turbine controllers (TC) for higher liquid ranges.


Why Choose These Flow Controllers?



Design Features

Full Scale Ranges from 0.5CCM to 1000LPM+

Response time of 100milliseconds typical

Turndown Ratio better than 100:1 Typical

Position Insensitive

Auto Tare or Push Button Tare on display units

Accuracy of +/-1% full scale (optional 0.5%)

13 Gas Selectability without recalibration (with display only)

Dynamic Digital Display

Local Control Capable



Local Set Point Module (LSPM)

Electrical Cables

AC/DC Power Adapter

Special Gas Blends

Remote Digital Displays

Customized Pressure Drop

Independent Output of Variables





Process Control



Thermal Mass Meter Replacement

Leak Testing





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