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I I ELECTRICAL CONNECTIONS � General Electrical Guidelines: Grounding Guidelines: Whenever possible avoid running control cables ;. For best results, use a good quality earth ground, in the same conduit with AC power. Use shielded such as metallic water piping, or a stake driven control cable where this type of installation is i i into the ground. necessary. j If the flow sensor is installed in metallic piping,for • If using shielded cable, be sure that one end is I; optimum grounding clamp wires to the piping a i grounded i short distance to either side of the flow sensor j using hose-type clamps. Connect these wires to Avoid routing flow sensor cables in close proximity the earth ground and to one of the housing screws, to a variable frequency drive. • Recommended power and output wiring is 18-22 I -AWG control cable, shielded if the run length is GROUNDING DIAGRAM more than 18 feet (6 meters). j i • Recommended voltage is 12-24 VDC. Note that unregulated power supplies can vary from Earth/ nameplate voltage by a considerable amount. Ground When in doubt, use a regulated power supply. j Ground To See the Connections diagrams on the following pages, for Metia,lilic Pipe the appropriate terminals. i Power: A 12 - 24 Vdc power supply which is capable of ' at least 250 mA current output is needed. Hose Clamp Pulse Output: This open-collector isolated output does not supply power. It functions like a polarity-sensitive switch i closure. It reaches a maximum of 500 Hz at the maximum flow rate of 20 feet/second. This pulse is generated in both forward and reverse flow directions (see "Direction" below). Note: This output is limited to 5 mA at 30 Vdc maximum. � I I ; I Direction Indicator: This output is switched by a solid state relay,which is not polarity sensitive. It is"off" (open) i r when flow is in the forward direction and "on" (closed) when flow is in the reverse direction. Note:this output is limited to 100 mA at 150 Vdc maximum. i I is ii i Page 5