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ELECTRICAL CONNECTIONS <br /> General Electrical Guidelines: Grounding Guidelines: <br /> • Whenever passible avoid running control cables . For best results, use a good quality earth ground, <br /> 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 i ! into the ground. <br /> necessary. <br /> 1! If the flow sensor is installed in metallic piping,for <br /> • <br /> If using shielded cable, be sure that one end is optimum grounding clamp wires to the piping a <br /> grounded short distance to either side of the flow sensor <br /> using hose-type clamps. Connect these wires to <br /> • Avoid routing flow sensor cables in close proximity the earth ground and to one of the housing screws. <br /> to a variable frequency drive. I <br /> ii <br /> • Recommended power and output wiring is 18-22 <br /> AWG control cable, shielded if the run length is GRQUNDING DIAGRAM <br /> more than 18 feet(6 meters). I <br /> • Recommended voltage is 12-24 VDC. Note that ` <br /> � I <br /> unregulated power supplies can vary from Earth/ <br /> nameplate voltage by a considerable amount. Ground <br /> When in doubt, use a regulated power supply. ! ! <br /> Gro fund To <br /> c See the Connections diagrams on the following pages,for Metallic Pipe! r <br /> the appropriate terminals. i <br /> f IL. <br /> i <br /> r <br /> Power: A 12- 24 Vdc power supply which is capable of <br /> at least 250 mA current output is needed. Hose.I Clamp <br /> Pulse Output: This open-collector isolated output does <br /> not supply power. It functions like a polarity-sensitive switch I <br /> I <br /> closure. it reaches a maximum of 500 Hz at the maximum I <br /> flow rate of 20 feet/second. This pulse is generated in <br /> both forward and reverse flow directions (see "Direction" j <br /> below). Note: This output is limited to 5 mA at 30 Vdc 1 ' <br /> k1i1, <br /> maximum. <br /> � i <br /> Direction Indicator: This output is switched by a solid j <br /> state relay,which is not polarity sensitive. Itis "off" (open) <br /> II <br /> when flow is in the forward direction and "on" (closed) 1 ` <br /> when flow is in the reverse direction. Note:this output is j <br />'4 limited to 100 mA at 150 Vdc maximum. ? <br /> ' i <br /> " I <br /> � s <br /> 1 � <br /> Page 5 <br />