The COSA Optical Flow Meter (OFM) uses laser beams to measure the gas flow by sensing the velocity of microscopic particulates naturally occurring in the gas.
The COSA Optical Flow Meter (OFM) has been specifically developed for gas applications with highly variable flow rates and a wide range of pipe diameters. The OFM accuracy is not affected by gas composition or contamination of the sensing elements.
The OFM uses laser beams to measure the gas flow by sensing the velocity of microscopic particulates naturally occurring in the gas.
Our OFM is compliant with ASME Code Section VIII, Division 1 and has been designed, manufactured, inspected and tested according to its recommendations.
The L2F consists of an optical head and a signal processing unit, which are connected by a fiber optic cable.
An insertion-style optical head as shown in below figure is designed for use in pipes from 2 to 38 inches nominal bore. The optical system is incorporated in a 3/4” stainless steel sleeve, which is installed in the pipe in a similar manner as thermal dispersion mass flow meters. The stainless steel optical head incorporates the delivery and collecting optical system assemblies, which are positioned perpendicularly to the flange bore and are insulated from the gas by optical windows.
The optical head is typically designed for single-point measurement which is located in the center of the pipe or at a quarter-radius from the pipe wall.
Signal Processing Unit:
The signal processing unit ( or opto-electronic converter ) is designed on one electronic board which fits into a normal NEMA or an explosion proof enclosure. The board incorporates a digital signal processing (DSP) chip with internal analog-to-digital conversion at sample rates up to 12MHz. It has inputs for pressure and temperature transmitters, so that various flow calculations can be performed.
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