|
contents | products | |||||||||
| New coal-bed methane gas flow meter  New Wafer-Cone Flow Meter from McCrometer offers high accuracy. The Wafer-Cone is an easy to install space-saving flow meter that requires almost no maintenance. The Wafer-Cone Flow Meter is designed for liquid or gas service in line sizes from ½ to 6", which makes it suitable for either small process lines or many plant infrastructure tasks. Applications for the Wafer-Cone range from chemical injection or filtering in process lines to general plant needs, such as lines for natural gas, chilled water supporting burners or ovens, cooling systems, HVAC and more.Its unique DP flow sensor is actually designed with built-in flow conditioning to achieve an accuracy of ±½%, with a repeatability of ±0.1%. It operates over a flow range of 10:1. With the ability to self-condition flow, the Wafer-Cone Flow Meter eliminates the need for extensive up/down stream straight pipe runs. It can be installed virtually anywhere in a piping system or be easily retrofit into an existing piping layout, resulting in significant installation flexibility and initial cost savings. The Wafer-Cone Flow Meter's design is accurate because the flow conditioning function is built-into the basic flow sensor design. The Wafer-Cone conditions fluid flow to provide a stable flow profile that increases accuracy. The flow sensor's design features a centrally-located cone inside a tube. The cone interacts with the fluid flow and reshapes the velocity profile to create a lower pressure region immediately downstream. The pressure difference, which is exhibited between the static line pressure and the low pressure created downstream of the cone, can be measured via two pressure sensing taps. One tap is placed slightly upstream of the cone and the other is located downstream of the cone. The pressure difference can then be incorporated into a derivation of the Bernoulli equation to determine the fluid flow rate. The cone's central position in the line optimizes the velocity of the liquid flow at the point of measurement. It forms very short vortices as the flow passes the cone. These short vortices create a low amplitude, high frequency signal for excellent signal stability. The result is a highly stable flow profile that is repeatable for continuous accurate measurement. All of this is possible with a minimal straight pipe run of 0 to 3 diameters upstream and 0 to 1 diameters downstream from the flow meter. write your comments about the article :: © 2007 Construction News :: home page |