A flow meter is a device that measures flow. Flow measurement is the quantification of bulk fluid movement (liquid or gas). Flow can be measured in a variety of ways.
Mechanical (Positive-displacement) flowmeters are best compared to a bucket and a stopwatch. The stopwatch is started when the flow starts, and stopped when the bucket reaches its limit. The volume divided by time gives the flow rate.
Pressure-based Meters rely on Bernoulli’s principle to derive the dynamic pressure. Optical flowmeters use light to determine flow rate. A direct measurement of mass flow can be obtained with Coriolis flow meters. These flowmeters use the Coriolis effect that causes a laterally vibrating tube to distort to measure mass flow.
If you’re doing gas chromatography, you must routinely measure gas flows when setting up an instrument, developing a method, or troubleshooting. Modern GCs rely on electronic pressure control (EPC) for setting flow rates. However, a flowmeter is still an essential tool to have- especially while troubleshooting. Also, many older GCs that are still in use don’t have EPC, which requires manually setting flows with a flowmeter.
Types of Flowmeters
There are generally two types of gas flowmeters- volumetric and mass. Both types measure the amount of gas exiting a column or split vent in a specific time period. If the amount of gas is measured in units of volume, the flow rate is volumetric based. The most common device for measuring a volumetric flow rate is a bubble flowmeter. If the amount of gas is measured in units of mass, the flow rate is mass based. The most common device for measuring mass flow is a thermal flowmeter (more commonly called mass flowmeter).
Top Flowmeter Manufacturers
HiTechTrader offers a variety of flow meters to meet your flow measurement needs. Hewlett Packard, Humonics, Brooks Instruments, Kobold, Sensus, and ISCO are all excellent manufacturers.
We Enjoy Technical Questions
We have been helping customers like you decide between different products since 1982 so send us an inquiry or call us today. ...