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Variable Area Flow Meters

Variable flow meters have a simple design, allowing for easy readings of flow rate. They provide results in clean liquids, corrosive, low pressure, low velocity, steam, gas and high/ low-temperature environments.

Featured Solutions

  • RAKD

    The RAKD Rotameter is a highly accurate variable area flow meter used for the measurement of liquids and gases, particularly in_low flow and high pressure applications. RAKD meters can be fitted with a fine control valve and are designed with horizontal process connections. An integrated flow controller based on the differential pressure principle allows a constant flow rate to be maintained regardless of any variations in process pressure.


    Unique, Robust Design

    The RAKD has an all stainless steel housing for use under the harshest industrial conditions and is also available with a fine control valve. Its light floats result in low pressure loss and stable float movement (reduced float bouncing), and guided floats improve flow indication stability, providing reliable measurements.

    Easy to Install & Maintenance Free

    RAKD rotameters are independent of the electrical power supply when operated as mechanical pointer instruments and also available with electrical output signal.

    High Level of Safety

    Optional fail-safe limit switches make the RAKD suitable for SIL2 safety applications. In addition, FMEDA reports are available to support SIL applications.

    Optional Electric Transmitter

    With an electric transmitter, the RAKD can produce a linearized signal output due to a µP controlled transmitter. By using a fast connection technique (QUICKON), easy cabling without opening of the housing is possible. Other features of the electric transmitter include:

    • Additional inductive limit switch and/or pulse output can be combined
    • Additional tuner with display (service box) can be connected to perform various configurations


    The indicator features a stainless steel enclosure well-accepted by industrial standardized design, providing enhanced corrosion resistance. Additional features of the indicator include:

    • Easy enclosure opening by bayonet catch without additional tools
    • Enclosure tightness of protection class IP 66/67

    Learn about Variable Area Flow Meters available at BBP.

  • RAMC

    The RAMC is a short-tube variable area flow meter used for the measurement of flow rates of liquids and gases, particularly in troubled, opaque or aggressive mediums. The RAMC features a robust design, provides reliable measurements with or without power and HART® or Profibus PA, resulting in a truly universal flow meter for gas, liquid and steam applications.


    All Mechanical Design
    The RAMC has a simple, robust design with three common components, making it ideal for low and high temperature applications, as well as making it highly reliable and reducing maintenance costs.
    Field Replaceable Components
    Many components of the RAMC are replaceable, including the float, scale, eprom (for eletronic transmitters), limit switches, and housing.
    Float Damping System (for Gas Applications)
    The float damping system is used in gas applications to avoid bouncing and putting a lot of wear on the float itself. The system is retrofittable and exchangeable at any time without requiring the operator to replace the float, and it can withstand a pressure maximum of up to 40 bar absolute. With this damping system, no recalibration is necessary after installation of the damping, and it is available to add on to old rotameters.
    Float Blockage Indication System
    This function is used for the electronic transmitter and detects when fluctuations remain under the preset level, activating an alarm.

    Indicator Features & Options

    • Optional Electronic transmitter with HART protocol, various power supplies and signal outputs for 4-20ma and HART 5 and 7
    • Indicator is available in stainless steel and aluminum
    • Adjustable Limit Switches (optional), achieves SIL2 rating
    • Broad range of hazardous area approvals (ATEX, IECEx, FM, etc.)

    Learn more about Variable Area Flow Meters available at BBP.


Sales Inquiries & Customer Support

(800) 299-4142