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Rotameters and Level Sensors for Liquids and Gases

SRB Controls provides a wide range of rotameters (variable area flow meters) for accurate visual flow indication of liquids, gases, and steam. Our level sensors are engineered for continuous, non-contact, and point-level measurement in tanks, vessels, and sumps. Our portfolio includes glass tube, metal, armored, and chemical-resistant rotameters, available with or without electrical outputs and switches.

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Rotameters & Level Sensors

Partnering with King Instruments, SRB offers rotameters built for rugged process environments—ideal for water treatment, compressed air, chemical dosing, and OEM applications. Each unit can be configured with 4–20 mA outputs, CRN approvals, and optional calibration services.

For customers seeking long-term reliability, SRB’s team provides commissioning and verification support to ensure precise flow monitoring and process compliance.

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Gas Flow Meter and Switches

Liquid Flow Meter and Switches

Temperature Infrared and RTD

Electricity Meters

BTU Metering

Rotameters & Level Sensors

IoT Sensors

Low Cost Radar

Wave guided radar (TDR) for tanks of all sizes.

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Low Cost for Liquids and Gases

Wide range of sizes for liquids and gases.

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Chemical Resistive Rotameters for Liquids and Gases

Flanged Rotameters with Analogue Display

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Frequently Asked Questions About Rotameters

What is a rotameter and how does it work?

A rotameter (or variable area flow meter) measures flow by raising a float inside a tapered tube. The float’s position corresponds to the flow rate, offering a simple, visual indication without external power.

When should I choose a metal rotameter instead of glass?

Metal and armored rotameters are ideal for high-pressure or high-temperature applications and for opaque fluids. Glass rotameters work well for clean, low-pressure systems that benefit from visual inspection.

Can rotameters be used with both liquids and gases?

B’s King Instruments line covers both liquids and gases, offering models with specific calibration for each medium to maintain accuracy across process conditions.

What does CRN mean on rotameters?

CRN (Canadian Registration Number) ensures compliance with provincial pressure equipment regulations. SRB offers CRN-approved rotameters suitable for regulated applications across Canada.

Do rotameters require power or maintenance?

Most rotameters operate mechanically, requiring no external power and minimal maintenance. When equipped with transmitters or switches, SRB can assist with wiring, commissioning, and annual verification.

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Gas Flow Meters and Switches

Liquid Flow Meter and Switches

Temperature Infrared and RTD

Steam Flow Meters

BTU Metering

Level Sensors