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APPLICATIONS: The Hersey® Meters FM³ fire service meter is designed for combined fire service and domestic water where a single supply line supports both fire and domestic or process needs and usage is consistently moderate to high. The meter may be utilized in automatic sprinkler systems and fire service, as a master meter for an entire water system, as a master meter for zoned systems, and for domestic or processed water where accuracy across a broad range of flows is critical. The FM³ meter eliminates the need for secondary service lines, saving time and reducing installation expenses and is compliant for FM® fire service meter applications.
CONSTRUCTION: Every Hersey FM³ meter is manufactured with epoxy coated ductile iron construction which eliminates additional gaskets and fasteners, reducing ongoing maintenance costs. The unique, Hersey strainer design protects the horizontal turbine meter measuring element in a unibody construction that reduces meter vault and installation costs due to its compact size and reduced weight while providing the specified strainer surface area. The unitized turbine measuring element is easily accessed through the epoxy coated top case of the meter and o-ring seals simplify field service.
REGISTER: The permanently sealed registers use proven magnetic drive design and the exclusive Hersey triple seal provides clarity and error free meter reading. Internal gears are self lubricating, molded plastic for minimal friction and a long service life. Standard visual read and electronic Translator® registers offer odometer wheels with a totalizing display and 360° degree test circle with center sweep hand and a low flow indicator. All Hersey FM³ models are available with electronic meter reading system components to meet any utility requirement and are protected by the unique Hersey locking pin.
OPERATION: During operation, all water flows through the sensitive horizontal turbine measuring element for accurate registration. The element employs Hersey’s unique Retro-Thrust® feature to divide wear across multiple points, increasing accuracy, reducing friction and extending the life of the measuring element. Integral flow straightening vanes on the inlet and outlet sides of the measuring element contribute to the long term accuracy of the meter.
INSTALLATION: Hersey FM³ meters are designed for horizontal installation with a minimum of five times the inlet pipe diameter of straight pipe prior to the meter and a minimum of three times the pipe diameter after the meter.
MAINTENANCE: All service components for the FM³ are unitized for easy replacement. Access to components is accomplished through the top side of the meter for full in-line service. Drop In Measuring Elements (DIMES) are available in pre-tested configurations which include a new measuring element, top case, register and o-ring for utilities that require quick field change outs .A calibration vane permits field adjustments to ensure accurate registration and extend the service life of the measuring element. The calibration vane is protected by the register and the locking pin for added security. For additional information regarding Hersey’s unitized replacement options, please contact the Hersey Meters Sales and Technical Support Group at 800-323-8584.
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