All-metal tube rotameters with needle valves for process applications, available in a range of sizes and flow rates, with options for flanged or screwed connections, plus optional output signals and alarm features.
Variable Area & Rotameters
With decades of experience in flow measurement, iCenta Controls supplies reliable variable area flow meters for accurate monitoring of liquids and gases. Referred to as rotameters (Yokogawa Company™), these meters provide visual indication of flow and are valued for their durability, and cost-effectiveness. Ideal for water treatment, chemical dosing, and industrial applications, our rotameter range offers dependable performance and integration.
Need help choosing the right meter? See our Variable Area Flow Meter Selection Guide.
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What is a Variable Area Flow Meter?
A variable area flow meter, commonly known as a rotameter, is a simple and reliable device used to measure the flow of liquids and gases. It operates on the principle of a float rising and falling within a tapered tube, providing a direct visual indication of flow rate. Rotameters are valued for their durability, low cost, and ease of use, making them ideal for a wide variety of applications, from water treatment and chemical dosing to laboratory and industrial processes.
How Do Variable Area Flow Meters Work?
Rotameter flow meters work by passing fluid through a vertically oriented, tapered tube that contains a float. As the fluid flows upward, it lifts the float to a point where the upward force of the flow is balanced by gravity. The float’s position corresponds to a calibrated scale, providing a direct and immediate flow reading. With no external power required and minimal maintenance, variable area rotameters are a practical choice for clear, reliable flow monitoring.
Variable Area Flow Meters from iCenta Controls
Variable area flow meters, commonly known as rotameters, provide a simple, cost-effective, and reliable solution for monitoring liquid and gas flow across a wide range of applications. At iCenta Controls, we supply high-quality rotameter flow meters ideal for industries such as water treatment, chemical processing, laboratories, and general industrial use, where durability and accuracy are essential.
Our portfolio includes models from trusted global brands as well as tailored solutions from Vögtlin and Georg Fischer Signet. With options ranging from compact glass-tube rotameters to microneedle flow, iCenta delivers dependable variable area flow measurement backed by expert advice and technical support.
Why Are Variable Area Flow Meters Important?
Variable area rotameters provide a simple, robust, and cost-effective method for measuring the flow of liquids and gases. They help to:
- Deliver clear, reliable flow indication, making them ideal for monitoring, batching, and process control.
- Operate without external power, offering a straightforward solution where electronic meters are not practical.
- Handle a wide range of flow rates and fluid types, with models available for low flow, corrosive, or pressurised applications.
- Reduce maintenance with durable designs and minimal moving parts.
- Integrate easily into new or existing systems, with options in glass tube or metal tube construction.
With proven reliability, versatility, and affordability, iCenta’s rotameter flow meters are trusted across industries such as water treatment, chemicals, laboratories, and general industrial processes.
What Are the Different Types of Variable Area Flow Meters?
At iCenta Controls, we offer a wide range of variable area rotameters to meet diverse flow measurement needs across liquids and gases. The most common types include:
- Glass Tube Rotameters: Provide a clear visual indication of flow, ideal for laboratories, test setups, and general-purpose monitoring of clean fluids.
- Micro Needle Rotameters: Designed for ultra-low flow applications, these meters feature a fine adjustment needle valve for precise control and measurement.
- Sanitary Rotameters: Designed for hygienic applications in food, beverage, and pharmaceutical processes.
- Low Flow Rotameters: Specially engineered for precise measurement of very small flow rates, perfect for dosing, blending, or chemical injection tasks.
In What Industries Are Variable Area Flow Meters Used?
Variable area rotameters are widely used for reliable, visual measurement of liquid and gas flow rates across a variety of industrial and commercial applications. They are particularly valued in sectors such as laboratory and research institutes, chemical processing, water treatment, HVAC, laboratories, and food and beverage production. Their simple, robust design makes them ideal for applications requiring easy-to-read, accurate flow measurement.
At iCenta Controls, our rotameter flow meters are trusted by engineers and operators across a wide range of industries. They deliver accurate, dependable measurement even in demanding or highly regulated environments.
See how iCenta flow meters perform across industries in our case studies.
How Can Variable Area Flow Meters Benefit Your Business?
Variable area rotameters provide accurate, real-time measurement of liquid and gas flow rates, helping optimise process control and operational efficiency. Their simple, visual design allows quick monitoring, improving dosing, batching, and general flow management while reducing waste and ensuring consistency.
With minimal maintenance and robust construction, rotameter flow meters deliver reliable, long-lasting performance across a wide range of applications. Our selection ensures precise flow measurement tailored to your specific operational needs.