Nivus i-3 Instruction Manual
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Contents
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Instruction Manuali-Series Sensors®i-Series Sensors - Rev. 00 as of 28.09.2012 Page 236.3.4 CableThe i-Series Intelligent Sensor comes with a fitted integral cable; if this cable isextended then the total capacitance must not exceed the limits for the voltageapplied.Important InformationIn the case of the Ex mb version the cable is fitted with an over current protec-tion device in the form of a fuse, please note that under no circumstancesshould this fuse be removed. The fuse must be fitted in the non-hazardousarea.6.3.5 Typical wiring for a Non-Hazardous locationThe HART modem and PC or HART programmer are used to set up the opera-tion parameters for the i-Sensor. The output can either be as a 4-20 mA currentgiving level or distance or as a digital signal via a HART master.The i-Sensors cable is a twisted pair with overall cable screen. The twisted pairare red and black, connect the red to +V and the black to -V. The screen shouldgo to signal ground.Loop ResistanceFor two wire operation the maximum cable resistance allowable can be calculat-ed from the graph below. For example if an i-Series Intelligent Sensor was sup-plied from 24 V, the maximum total cable resistance is 600 ohms, for a typical77 ohm /km cable this would mean a maximum cable length of 600/77 = 7.8 km,remember this total cable resistance, so this figure has to be divided by 2 to give3.9 km max distance. |
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