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APPLICATIONS: The Hersey Meters Frequency Transmitters (FT1,
FT2 or FT3) and 4-20mA FLO Unit allow meter flow rates to be electronically
transmitted to any device that can utilize a 4-20mA output.
These devices are typically used with information management or
SCADA systems for data collection. Management systems such as
these permit the tracking of flow rates in real time to better manage
resources and control costs.
CONSTRUCTION: Each FT1, FT2 or FT3 is comprised of solid state, hall
effect sensors and includes a 25’ long, 22 gauge, three strand wire.
Positive Displacement (PD), Fire service (MFMII), and Compound
(MCTII) meters are manufactured with the potted board installed
inside an aluminum disc and mounted under the register. Vertical
Turbine (MVR) and Horizontal Turbine (Horizon) meters are manufactured
with the sensors and board installed inside the sealed Translator
Register. The 4-20mA FLO Unit consists of a molded ABS enclosure.
All internal components are potted for moisture protection.
OPERATION: Unobtrusive and small, the Frequency Transmitters
and FLO Units are integral parts of any information management or
SCADA system. Hall effect sensors detect the polarity changes from
the four pole magnet inside the meter as it rotates. The changes in
polarity are sent as an electrical voltage to the 4-20mA FLO Unit.
The box converts the voltage created by the drive magnet rotations
into a proportional current that correlates with flow rate through the
meter. A no flow condition through the meter correlates with 4mA
and maximum flow rate correlates with 20mA. This data can be
used by an information management system to efficiently track flow
information over time.
INSTALLATION: The Frequency Transmitter is installed on the Hersey
meter per the installation instructions included with the device. Wire
connections are made to the proper screw terminals of the 4-20mA
FLO Unit (see installation instructions provided with the device) and
to the information system to provide power and data input (see the
manufacturers’ instructions for your system to insure proper connection).
The 4 – 20mA FLO Unit should be installed in a dry environment
or encased in a waterproof enclosure.
Each box is programmed for a specific type and size of measuring
element but may be reprogrammed by Hersey Meters. Check the
label located on the bottom of the 4-20mA FLO Unit for date, type
and size of meter programming parameters. Contact Hersey customer
service for reprogramming costs and information. Kits for installation
or conversion of all existing meters consist of one Translator Register
and one Frequency Transmitter in the appropriate register housing
with one 4 -20mA FLO Unit programmed for that specific register.
Additional 22 Gauge, three strand wire is available in spool quantities
as a separate part number if needed.
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Model |
Sold as Kits Only.
Either FT1, FT2 or FT3 and 4 - 20mA FLO Unit,
FT1, for MFMII, MCTII and PD Meters FT2, for Horizon
FT3, Frequency Transmitter for MVR Meters
4-20mA FLO Unit, Converter Box for 4-20mA Signal |
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Sensors |
Hall effect potted within
an aluminum disc or contained inside the register |
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4-20MA Flo Unit |
Factory potted and programmed
with an ABS plastic enclosure |
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Power Source |
10V -35V
DC External Power (typically from information management,
SCADA, or Datalogger) |
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Electronic Accuracy |
1% of full scale |
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Temperature Range |
-40° to 140°F |
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Maximum Wire Lengths |
FT to
4/20mA FLO Unit: 25', 22 gauge wire;
4-20mA FLO Unit to Information management system up to
one mile when utilizing 22 gauge wire and a 24V power supply.
Variations in wire gauges and supply voltages will affect
transmission distances. |
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Dimensions |
FT 1
for MFMII, MCTII, 400IIS and 500IIS PD Meter Style |
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Disc |
3.35" Diameter, 1/8" Thick installed within machined register housing. FT 2 and
3: Horizon and MVR: Installed inside register 4-20mA FLO
Unit: Length: 3.8" X Width 2.2" X Height 1.8" |
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Accessories |
22 Gauge, three strand wire
is available in 1000' spools: Part #A13015 |
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