ABB 4680 Installation & Operating Manual

Also see for 4680: Installation & operating guide

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ABB 4680 Installation & Operating Manual Manual pdf 4 page image

2NON HAZARDOUS AREAHAZARDOUS AREA(Zone 1, Class IIB)Process20°C to600°C1.1 BarAbsoluteMaximum(40in WG)EXFG ProbeEEx d IIB T3 (Tamb –20°C to 55°C)to EN30014 1993 and EN30018 1995Mains SupplyControl ThermocoupleSignal4 to 20mA Output Signal(25% to 0.25% O2 )or4680 TransmitterMains SupplyFlameproof Interface Electronics UnitEEx d IIB T6 Conforming to BS5501 Part 5: 1977Flue4685 TransmitterRetransmissionOutput – seeSection 4Reference Air Line EntryRegulatedReference Air Unit(003000241)O 2 mV Signal(–20 to +180mV)orLogicAlarmSignal1.1 BarAbsolute MaximumDry, Oil-freeInstrument Air(10 bar max.)ControlledHeaterSupplyOver-temperatureTrip ThermocoupleTest GasInlet…1 INTRODUCTION1.2 System Hardware – Fig. 1.2The 4680 and 4685 transmitters are part of the EXFG OxygenAnalyzer System which measures oxygen content andtemperature within a gas flue. The 4680/500 model is a wall-mounted instrument and the 4685/500 model is a panel-mounted, DIN-sized instrument. Signals from either transmittercan also be retransmitted to remote monitoring equipment.Both models have a single programmable input channel and asingle temperature input channel. Instrument operation andprogramming is via four tactile membrane switches located onthe front panel. Programmed functions are protected fromunauthorized alteration by a five-digit security code.1.3 Principle of Operation– Fig. 1.2The transmitter unit processes a 4 to 20mA (25% to0.25% O2) signal generated at the Interface Electronics Unit anddisplays the oxygen value in O 2 with selectable ranges (log orlinear). All ranges can be retransmitted.In addition, the transmitter processes any alarm signalsgenerated from the Interface Electronics Unit – see the EXFGProbe Guide and EXFG Interface Electronics Unit Guide foradditional system operating information.Fig. 1.2 System Schematic