Instruction Manual
Ground To
Metallic Pipe
Earth
Ground
Hose Clamp
Page 5
ELECTRICAL CONNECTIONS
GROUNDING DIAGRAM
Grounding Guidelines:
For best results, use a good quality earth ground, such as
metallic water piping, or a stake driven into the ground.
If the flow sensor is installed in metallic piping, for optimum
grounding clamp wires to the piping a short distance to either
side of the flow sensor using hose type clamps. Connect
these wires to the earth ground and to one of the housing
screws. (For non-metallic piping, this step is not needed.)
EX meters are usually unaffected by moderate levels of
electrical noise. In some applications per formance may
be improved by taking the following steps:
• Use shielded twisted pair cable (Belden 8723 or
equivalent above ground or Alpha 35482 or
equivalent burial).
• Clamp a ferrite bead (Steward 28A2029-OAO or
equivalent) on meter signal/power wire within 3/4”
of the meter strain relief (tape or tie wrap in place if
necessary). See diagram below.
• IMPORTANT - Connect the cable shield ground
wire to ground, ONLY at power supply end of cable.
General Electrical Guidelines:
• Whenever possible avoid running control cables in
the same conduit with AC power.
• Using shielded cable, be sure that one end is
grounded.
• Avoid routing flow sensor cables in close proximity
to a variable frequency drive.
• Recommended power and output wiring is shielded
18-22 AWG control cable.
• Recommended voltage is 12-24 VDC. Note
that unregulated power supplies can var y from
nameplate voltage by a considerable amount. When
in doubt, use a regulated power supply.
See the Connections diagrams on the following pages for
the appropriate terminals.
Power: A 12 - 24 Vdc power supply capable of at least 250
mA current output is needed.
Forward Flow Output: This open-collector isolated output
does not supply power. This pulse is generated in the
forward flow direction on the standard unit. (Reverse flow
output is available as an option).
Note: This output is limited to 6 mA at 30 Vdc maximum.
Reverse Flow Output: Reverse flow output is available
as an option. This open-collector isolated output does not
supply power. It functions like a polarity-sensitive switch
closure.
Note: This output is limited to 6 mA at 30 Vdc maximum.
PLACE FERRITE BEAD HERE
Ensures full pipe
Keeps pipe full at sensor
(Not needed for non-metallic pipe)
ARCHIVED
(Includes Dates 6/28/05 to 10/06)