Vega VEGABAR 81 Product Information

Also see for VEGABAR 81: Operating instructions Operating instructions Quick setup guide Operating instructions Quick setup guide

Contents

8 Electronics - 4 … 20 mA/HART - two-wireConfiguration of the electronicsThe pluggable electronics is mounted in the electronics compartment ofthe instrument and can be exchanged by the user when servicing is re-quired. The electronics is completely encapsulated to protect againstvibration and moisture.The terminals for voltage supply as well as the contact pins with I²C inter-face for parameter adjustment are located on the upper side of the elec-tronics. In the double-chamber housing, the terminals are located in theseparate terminal compartment.Voltage supplyPower supply and current signal are carried on the same two-wire cable.The operating voltage can differ depending on the instrument version.You can find the data of the voltage supply in chapter "Technical data" inthe operating instructions manual of the respective instrument.Provide a reliable separation between the supply circuit and the mainscircuits according to DIN EN 61140 VDE 0140-1.Data of the voltage supply:l Operating voltage- 9.6 … 35 V DCl Permissible residual ripple - Non-Ex, Ex-ia instrument- for UN 12 V DC: ≤ 0.7 Veff (16 … 400 Hz)- for UN 24 V DC: ≤ 1.0 Veff (16 … 400 Hz)l Permissible residual ripple - Ex-d-ia instrument- for UN 24 V DC: ≤ 1.0 Veff (16 … 400 Hz)Keep in mind the following additional factors that influence the operatingvoltage:l Lower output voltage of the power supply unit under nominal load (e.g.with a sensor current of 20.5 mA or 22 mA in case of fault)l Influence of additional instruments in the circuit (see load values inchapter "Technical data" of the operating instructions of the respectiveinstrument)Connection cableThe instrument is connected with standard two-wire cable without screen.If electromagnetic interference is expected which is above the test valuesof EN 61326-1 for industrial areas, screened cable should be used.In the product configurator of VEGABAR, different cable glands are avail-able. This selection covers all cable diameters in the range of 4 … 12 mm(0.16 … 0.47 in).We generally recommend the use of screened cable for HART multidropmode.Cable screening and groundingIf screened cable is required, we recommend connecting the cablescreen on both ends to ground potential. In the sensor, the screen mustbe connected directly to the internal ground terminal. The ground terminalon the outside of the housing must be connected to the ground potential(low impedance).ConnectionSingle chamber housing51 2+( ) (-) 6 7 84...20mA2341Fig. 25: Electronics and terminal compartment, single chamber housing1 Voltage supply/Signal output2 For display and adjustment module or interface adapter3 For external display and adjustment unit4 Ground terminal for connection of the cable screenDouble chamber housing4...20mA231 2+( ) (-)1Fig. 26: Terminal compartment, double chamber housing1 Voltage supply/Signal output2 For display and adjustment module or interface adapter3 Ground terminal for connection of the cable screenElectronics - 4 … 20 mA/HART - two-wire10 Process pressure – Pressure transmitter45078-EN-140625

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