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#2: Utilizing Exiting Pulsers on Dispensers/Meters
Many dispensers and
metering systems come already equipped with pulser units or can be equipped with
third party pulsers. The LINK will interface with most of them. The LINK is equipped
with 2 separate pulser inputs.
a) The first pulser input is a two wire combination that exits from the
bottom
of the
LINK with all the other wires and is referred to as the LINK internal pulser wires.
Please see wiring diagram on page 5. This input is used when the existing pulser
wires are already internal in the conduit system. These two wires, orange and gray,
are part of an optically isolated circuit. Connecting them together causes the optical
circuit to flash. This in turn will pulse a single pulse each time the wires are
connected. An external pulser will have to connect the two wires for each pulse.The
gray wire is ground and the orange wire is positive.
b) The second alternate pulser input enters into the LINK at the
top
of the LINK
through the 7-pin circular connector as shown on page 8. This is the same cable
that is supplied with the Trak flow pulser but has no pulser on the end. The wires
can be connected to any pulser output by tying the wires together using wire nuts.
The wiring from the FluidSecure LINK is designed intrinsically safe and can be safely
run without conduit in a Class 1, Division 1 location or any lesser classification. Do
NOT allow it to enter into a junction box, conduit or other device that could connect
these pulser wires to external high voltage wiring.
The black and yellow wires form a pulled up circuit that the external pulser must
connect together to pulse the circuit. External 5VDC is also supplied via the red wire to
power an external pulser circuit.
4) Low Voltage Wiring Connections
The LINK is capable of running from 12 to 24 VDC instead of AC power. The
electrical diagram in A.2. shows a red and green wire labeled as gnd and +12VDC. The
LINK can actually run from 24VDC as well. These two wires can be utilized for power
hookup. The two brown wires also shown are still used to control the power to the
solenoid or pump. Since the brown wires are not electrically connected internally in the
LINK, they can be used with any external control voltage from 5VDC to 240VAC
regardless of the power used to operate the LINK. The same safety warnings apply to
low voltage installation as the high voltage ones.
B. Installation - Standard Dispenser
Wiring connections are the same as the above ground tanks. However, there are
many different dispensers and each one will have differences from one manufacturer to
another. It is not within the scope of this document to address all possible combinations.
