Variable-area flow meter MT3809 series
for liquidsfor gasDN50 - 2"

variable-area flow meter
variable-area flow meter
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for liquids, for gas
Pipe diameter
DN50 - 2", DN25 - 1", DN40 - 1"1/2, DN15 - 1/2", DN20 - 3/4"
in-line, flange, vertical
stainless steel, aluminum
4-20 mA
Protection level
rugged, ATEX, corrosion-resistant, chemical-resistant, intrinsically safe, waterproof, weather-resistant, for harsh environments
for the pharmaceutical industry, industrial, for low flow rates, for water treatment, for the food industry, for the petrochemical industry, high-pressure, for high flow rates, for harsh environments, HVAC, for the oil and gas industry, for the beverage industry, for corrosive environments, irrigation, for pumping applications, for tanks
Other characteristics
with display, ultra-compact, digital, precision, custom, electronic, remote, economical, direct-reading, programmable, low-pressure, with indicator, high-temperature, high-pressure, with pressure measurement, with alarm function
Process pressure

Min.: 6,000 psi

Max.: 20,000 psi

Process temperature

Min.: -198 °C (-324 °F)

Max.: 420 °C (788 °F)

Volumetric flow rate

Min.: 1 l/h (0.3 us gal/h)

Max.: 100,000 l/h (26,417.2 us gal/h)


1 %, 2 %, 3 %, 5 %


Min.: 0 %

Max.: 1 %


Widest temperature, pressure and process range. One proven flow meter. Engineered to work where you need it: Choose the MT3809 variable area (VA) max flow meter (rotameter) for all the high-pressure, high-temperature VA flow measurement and control requirements on your next project. Proven to deliver reliable, repeatable gas and liquid flow measurement and control in thousands of installed locations, the MT3809 is practical and economical, making it the “go-to” choice for Engineering Procurement Contractors (EPC) and major industrial facilities worldwide. The MT3809G configuration features a digital LCD display with local operator interface, providing valuable process outputs such as totalization and alarm signals. It also lets users make parameter changes without removing the cover, which means changes can be made even in hazardous areas. Features • Flow meter offers extremely wide range of flow ratings - supports very low to very high flow rates • Enhanced LCD display with local operator interface (optional) • High-/low-flow alarm functions that meet SIL 2 requirements • 316SS stainless steel flameproof housing meets ATEX gas group IIC/Class 1 Div 1 hazardous area rating • Selection of corrosion resistant wetted materials and indicator housing to fit demanding application needs • Gasket sealing surface meets ASME requirements, no special gaskets required Benefits Repeatable flow measurement even at very low process temperatures and the highest process temperatures of any VA meter Designed to meet ASME B31.3 – a requirement requested at the world’s major industrial facilities


*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.