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APPLICATIONS: Recommended for measuring high-volume
water usage from fire hydrants or other fire protection systems.
Convenient hose connections and light-weight construction make
this portable turbine meter useful for accurately measuring water
used for construction, street sweepers, water tankers or other
equipment.
CONFORMANCE TO STANDARDS: Hersey Model HM Water Meters
comply with ANSI/AWWA Standard C701 class II. Each meter is
tested to ensure compliance.
CONSTRUCTION: Hersey Model HM Water Meters consist of three
basic parts: D-I-M-E (Drop-In-Measuring-Element), bottom case
and register. The D-I-M-E assembly contains all of the working
parts inside of the meter and is easily removed from the bottom
case when servicing is desired. The bottom case is constructed
from cast aluminum to be lightweight and has carry handles for
portability. The register is enclosed in a lockable bronze register
box. The rotor assembly is thermoplastic which is dimensionally
stable and will not corrode. The inlet connection has a 2-1/2" female
national hose thread swivel adapter and the outlet connection
is 2-1/2" male national hose threads.
REGISTER: The permanently sealed register incorporates a
bayonet style locking mechanism with Hersey’s unique integral
tamper pin. The totalizing register has a straight-reading odometer
type display, a 360° test circle with center sweep hand and a low
flow (leak) indicator.
OPERATION: Water flows straight through the turbine section
where it turns a rotor at a rate in direct proportion to the amount
of water flowing through the meter. The straight-through design
allows high volumes to flow with a minimum of head loss. Retro
Thrust rotor design extends the life of the meter by dividing wear
between two points: during low flow the tungsten carbide thrustbearing
floats against a sapphire bearing surface; during high
flow the stainless steel shaft gently contacts a second sapphire
bearing. During medium flow, the rotor floats between the thrust
bearings without contact.
MAINTENANCE: The Hersey Model HM Meters are designed
and manufactured to provide long service life with virtually no
maintenance required. D-I-M-Es are available for field replacement
and offer new meter accuracy and warranty benefits without
field testing. Existing D-I-M-Es can be returned to the factory for
refurbishment with new registers and measuring elements for
installation later.
CONNECTIONS: Available with National Standard for fire hose
coupling thread, female and male couplings.
CARRYING HANDLE: Facilitates ease of transportation.
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Model Designation
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Hydrant Meter |
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Sizes |
3" |
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Maximum Working Pressure
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175 PSIG |
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Temperature Range |
33F to 130F water temperature |
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Operating Range |
8 - 500 GPM |
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Meter Top Case |
Bronze |
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Meter Bottom Case |
Epoxy-coated cast aluminium |
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Measuring Chamber |
Thermoplastic |
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Register Box and Lid |
Bronze |
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End Detail (fire hose
couplings) |
Inlet: 2-1/2" - 7-1/2 NPSH.
(National Standard for fire hose coupling thread) Female Coupling.
Outlet: 2-1/2" - 7-1/2 NPSH, Male Nipple |
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Shafts and Bolts |
Stainless steel |
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