An online rotameter (also known as a digital rotameter or electronic variable area flow meter) is a type of flow measuring instrument used to monitor the real-time flow rate of liquids or gases in a pipeline. Unlike traditional mechanical rotameters, online rotameters often come with digital displays, signal outputs, and online monitoring capability for integration into process control systems.
1. Purpose:
Measures the flow rate of liquid or gas in a pipeline in real time and transmits the data digitally.
2. Key Features:
Digital LCD/LED display showing flow rate
Works based on variable area principle (float rises with flow)
Remote monitoring capability (420 mA, RS485, Modbus output)
High accuracy and repeatability
Optional alarms for high/low flow
Robust construction: often SS316, polycarbonate, or other corrosion-resistant materials
Low pressure drop
3. Working Principle:
A float inside a tapered tube rises as flow increases. Its position corresponds to the flow rate. In online versions, this position is sensed electronically and shown digitally or transmitted to control systems.
4. Applications:
Water treatment plants
Chemical and pharma industries
Oil & gas pipelines
Food and beverage processing
HVAC systems

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