Product Description

KROHNE H250/RR/M9/ESK2AAIR

The KROHNE H250/RR/M9/ESK2AAIR is a versatile and robust all-metal variable area flowmeter designed for measuring the flow of liquids and gases in demanding industrial applications. The H250 series is renowned for its reliability, even under extreme process conditions such as high pressures and temperatures. This particular model features the M9 mechanical roller indicator for clear local flow visualization without the need for auxiliary power. The “RR” designation typically signifies stainless steel (e.g., 1.4404/316L) for wetted parts like the measuring cone and process connections, providing excellent corrosion resistance. The “ESK2” component indicates the inclusion of two inductive limit switches, enabling alarm functions or simple control tasks based on flow rate. This flowmeter is suitable for a wide range of industries, including chemical, petrochemical, power generation, and oil & gas.

Technical Specifications:

Measuring Principle: Variable Area (Float type)
Indicator Type: M9 (Mechanical roller indicator, IP66/IP68, NEMA4X/6)
Wetted Parts Material (RR): Typically Stainless Steel 1.4404/316L (cone and connections), other materials may be available based on full configuration.
Suitable Media: Liquids, Gases, and Saturated/Superheated Steam
Process Connections: Various options available (e.g., Flanged ASME, EN, JIS; Threaded NPT, G) – specific to full model configuration.
Nominal Sizes: Typically DN15 to DN150 (½” to 6″) – depends on variant.
Measuring Ranges for Liquids: Wide range, e.g., 0.5 l/h to 120,000 l/h (water: 20°C) – depends on size and float.
Measuring Ranges for Gases: Wide range, e.g., 0.015 Nm³/h to 3,600 Nm³/h (air: 20°C, 1.013 bar abs) – depends on size and float.
Accuracy: Typically according to VDI/VDE 3513-2 (qG=50%), e.g., class 1.6 or 2.5, depending on configuration.
Electrical Output (ESK2): Two inductive limit switches (e.g., NAMUR Ex i, or 3-wire transistor Ex nA)
Operating Temperature: Wide range, typically -200°C to +400°C (-328°F to +752°F), depending on specific materials and options.
Operating Pressure: Up to 400 bar (5800 psi), depending on connection type and temperature.
Approvals: Often available with ATEX, IECEx, FM, CSA, NEPSI, EAC Ex, INMETRO for hazardous areas (specific to “AAIR” and other suffixes in full model code).