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E <br /> ELECTRICAL CONNECTIONS <br /> General Electrical Guidelines: Gn inding uid k li es: <br /> I <br /> Whenever possible avoid running control cables For best resu ts, use a good quality earth ground, <br /> 1 in the same conduit with AC power. Use shielded such as metallic water piping, or a stake driven <br /> control cable where this type of installation is into the ground. <br /> necessary. j <br /> If the flow sensor is installed in metallic piping,for <br /> • If using shielded cable, be sure that one end is <br /> optiry um gro nding;clamp wires to the piping a <br /> grounded <br /> shor distange to either side of the flow sensor <br /> usin � hose-t lyse clamps. Connect these wires to <br /> • Avoid routing flow sensor cables in close proximity I the e� rth ground and to one of the housing screws. <br /> to a variable frequency drive. <br /> • Recommended power and output wiring is 18-22 <br /> it <br /> AWG control cable, shielded if the run length is <br /> GFI UNDiNG DIAGRAM <br />' I <br /> more than 18 feet (6 meters). i ! <br /> i Recommended voltage is 12-24 VDC. Note that _ <br />' unregulated power supplies can vary from Ea 11 <br /> / 3 <br /> nameplate voltage by a considerable amount. Gr d <br /> e ! <br /> When in doubt, use a regulated power supply. Grd To <br />! I <br /> M Ilic Pipe <br /> See the Connections diagrams on the following pages,for <br /> the appropriate terminals. <br /> Power: A 12 - 24 Vdc power supply which is capable of <br /> i I <br /> at least 250 mA current output is needed. Ho Clamp <br /> Pulse Output: This open-collector isolated output does <br /> not supply power. It functions like a polarity-sensitive switch <br /> I <br /> closure. It reaches a maximum of 500 Hz at the maximum <br /> flow rate of 20 feet/second. This pulse is generated in ! i <br /> I both forward and reverse flow directions (see "Direction" I i <br /> I below). Note: This output is limited to 5 mA at 30 Vdc <br /> maximum. <br /> Direction Indicator: This output is switched by a solid f <br /> state relay,which is not polarity sensitive. It is "off' (open) <br /> he forward direction and "on" closed <br /> when flow is !n t (closed) <br /> when flow is in the reverse direction. Note:this output is <br /> f limited to 100 mA at 150 Vdc maximum. j <br /> I <br /> I <br /> j Page 7 <br />