Variable Area Flowmeter for Gas, Liquid, Steam

Schmierer SEA offers a wide range of VA Variable Area Flowmeters for liquids, gas and steam applications. The standard VA or rotameter is mounted in a vertical pipeline with flow direction upwards. It is easy to install and maintain and has a low pressure drop. VA meters are cost efficient, robust and reliable and come with an analog mechanical or LCD display and a 4-20 mA output option.
Special applications for:

• hazardous, aggressive fluids
• high temperature, high pressure, high flow
• with heat jacket

Working Principle:

The operation is based on the variable area principle: fluid flow raises a float in a tapered tube,
increasing the area for passage of the fluid. The greater the flow, the higher the float is raised. The
height of the float is directly proportional to the flowrate. With liquids, the float is raised by a
combination of the buoyancy of the liquid and the velocity head of the fluid. With gases, buoyancy is
negligible, and the float responds to the velocity head alone. The float moves up or down in the tube
in proportion to the fluid flowrate and the annular area between the float and the tube wall.

Technical Features:  

• Pipe Size: DN 15 to DN 200
• Turndown ratio: 10:1
• Accuracy: ±1.0%; ±1.5%
• Connection: Thread; Tri-clamp; Wafer; Flange
• Signal output: 4-20mA, Pulse and Modbus RS485
• Mechanical & Digital Display
• Mini, Sanitary, Glass type

Applications:

• Basic liquid (including water) or gas flow measurement
• Rotating equipment flow measurement
• Process analyzers
• High-pressure flow on offshore oil platforms
• Chemical injection
• Purge liquid or gas metering