Nivus NFP Instruction Manual

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Nivus NFP Instruction Manual Manual pdf 22 page image

®Instruction ManualNFPPage 22 NFP - Rev. 02 as of 24.11.20097.2.4 Sensor ConnectionThe sensor is equipped with a fixed cable Type LIY11Y 2x1.5 mm² +1x2x0.34 mm² with various possible lengths (see also Fig. 6-4).The allowed maximum fixed cable length between flow velocity sensor andtransmitter is 150 m.It is possible to extend the sensor cable up to a total length of 150 m using thecable type mentioned above or an adequate cable type.If you use a connection box in order to extend the cable, this box must bemade of metal. Please necessarily connect the shields of feed and return ca-ble to the shield connections of the connection box.Improper connections which lead to higher transition resistance or the use ofother cables may lead to disturbance and errors in the measurement.The sensor cable has to be connected to the transmitter at the termination blockSensor. The diagram below applies in case of connecting a flow velocity sensor:Fig. 6-4 Connection of a water ultrasonic active sensorFor use of the sensors in the Ex-area, the sensor cables must not be directedpast the mechanical shield between the termination blocks. Use only the3 cable connections of the sensor connection block!