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Flowmeters
Variable Area Flowmeters
Variable area flowmeters, often called rotameters, show flow from the height of a float in a tapered tube and need no power for local indication. Seven Star LLC, an independent supplier in Muscat, supplies variable area flowmeters from Brooks Instrument, ABB, KROHNE, Spirax Sarco, Tecfluid, Blue-White and KOBOLD to customers in Oman and the GCC.
Read the full category guide- 19 products
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Category guide
About Variable Area Flowmeters
Variable area flowmeters, often called rotameters, show flow from the height of a float in a tapered tube and need no power for local indication. Seven Star LLC, an independent supplier in Muscat, supplies variable area flowmeters from Brooks Instrument, ABB, KROHNE, Spirax Sarco, Tecfluid, Blue-White and KOBOLD to customers in Oman and the GCC.
Types of variable area flowmeter in this category
Glass tube flowmeters such as the Brooks GT1600 and Sho-Rate 1250, 1350G and 1358, ABB FGM1190 and Purgemaster FGM6100 give visual indication for liquids and gases. Metal tube meters like the KROHNE H250 M40, Brooks MT3809G and MT3750C, ABB VA Master FAM540, Tecfluid SC250 and KOBOLD BGN handle high pressures, temperatures and opaque fluids, with optional 4-20 mA output. Plastic meters from Blue-White serve water treatment, and Spirax Sarco TFA, TVA and ILVA meters measure steam.
How to select a variable area flowmeter
Define fluid, flow range, pressure, temperature and density. Choose glass tube for clean, low-pressure, visible applications and metal tube for high pressure, high temperature or hazardous fluids. Specify connection, mounting orientation, scale units and any transmitter or alarm contacts.
Data needed for a quotation
Send the model, or fluid, flow range, pressure, temperature, connection, scale, output and quantity.
What to include in your inquiry
These details let us quote the right item the first time.
- Fluid and its state (liquid, gas or steam)
- Line size and pipe material
- Flow range: minimum, normal and maximum
- Operating pressure and temperature
- Output or protocol (4-20 mA, HART, pulse, Modbus)
- Hazardous-area classification, if any
Missing some of them? Send what you have. A nameplate photo or an old part number is enough to start.
Brands in Variable Area Flowmeters
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Request a Quote for Variable Area Flowmeters
Looking for a specific model, part number or brand in Variable Area Flowmeters? Send us your requirements and quantities. Seven Star LLC sources genuine industrial equipment for customers across Oman and the GCC and replies with a formal quotation.
- Genuine OEM products
- Supply across Oman & the GCC
- Formal quotation from our sales team
Free, no-obligation quotation · takes about 1 minute
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Frequently Asked Questions
How does a rotameter work?
A float rises in a tapered tube until the flow force balances its weight. The float position on the scale shows the flow rate.
Does a variable area meter need power?
Not for local indication. Electrical outputs and alarms need power.
Must a rotameter be mounted vertically?
Most variable area meters must be installed vertically with flow upward. Some spring-loaded designs can be mounted in other orientations.
Why is the scale fluid-specific?
The float balance depends on fluid density and viscosity, so the scale is calibrated for a specific fluid and conditions.
What should I send for a quotation?
The model, or fluid, density, flow range, pressure, temperature, connection, output and quantity.