BA427E 4/20mA manual set point station [set ... - BEKA Associates

Hazardous areaSafe areaBA427E4/20mA manualset point station[set point generator]4/20mAZener barriers orgalvanic isolators4/20mASpeedcontroller+Intrinsically safe for usein all gas and dusthazardous areasu Loop poweredShown with optional loop powered backlightThe BA427E is an intrinsically safe panelmounting set point station that enables thecurrent flowing in a 4/20mA loop to bemanually adjusted via the front panel pushbuttons from within the hazardous area. It isa second generation instrument that ismechanically and electrically compatiblewith the earlier BA405C, but has moredisplay digits plus additional functions.Main application of the BA427E is theadjustment of a 4/20mA plant parameterfrom within a hazardous area. For example,used as the remote set point generator for aspeed controller the BA427E enables speedadjustments from within the hazardousprocess area. The BA427E may also beused to position an actuator or valve with a4/20mA input. The BA427E incorporates afive digit display plus a bargraph that maybe calibrated to show the engineering unitsrepresented by the 4/20mA current, allowingan operator to easily set the processvariable to the required value.International intrinsic safety certificationpermits the BA427E to be installed throughoutthe world. All input safety parameters are thesame or greater than those for the precedingBA405C, thus allowing the BA427E to safelyreplace the earlier model.Five pre-set output values may be rapidlyselected using the instrument’s front panelpush buttons for applications where thesame output values are repeatedly required.To minimise plant disturbance when theoutput is adjusted or switched betweenpre-sets, the maximum rate of output currentchange may be defined. The 4/20mA outputrange may also be restricted so thatoperators can only adjust the plant variablewithin safe limits.The bold 11mm high liquid crystal displayprovides maximum contrast and has a verywide viewing angle, allowing the BA427Eset point station display to be read easily inmost lighting conditions over a widetemperature range. The five digits, with fourdecimal points and a negative sign, may beconfigured to display any variablerepresented by the 4/20mA output currentbetween -99999 and 99999.Engineering units represented by the4/20mA output current are shown on thescale card viewed through a window on theright hand side of the display. If the units arespecified when the BA427E is ordered aprinted scale card will be fitted. If units are notspecified, a blank card will be supplied whichcan easily be marked and installed on-sitewithout dismantling the set point stationenclosure or removing it from the panel.Display backlighting which may be loop orseparately powered is available as a factoryfitted option. It provides green backgroundillumination allowing the display to be readat night or in poorly illuminated areas. Whenpowered from the 4/20mA loop no additionalintrinsically safe interface or wiring isrequired. Powering from a separate supplyproduces a brighter backlight but requiresan additional intrinsically safe interface andfield wiring. Two backlights may beseparately powered from one intrinsicallysafe interface.IP66 front panel protection and a neoprenegasket to seal the joint between the set pointstation and the panel make the instrumentsuitable for use in areas that will be cleanedwith a hose. To simplify installation andmaintenance, the set point station has aremovable terminal block allowing panel wiringto be completed before the BA427E isinstalled.A BA490 panel mounting external rotaryencoder may be directly connected to theBA427E set point station to provide analoguecontrol of the output current. The encodercomplies with the requirements for SimpleAparatus and can be installed in the samehazardous area as the set point station.Reliability is ensured by componentconformal coating, protection from incorrectconnection and radio frequency interference.The set point station has been subjected tovibration testing and is supported by a threeyear guarantee.0u Intrinsically safeATEX, IECExETL & cETL.u 5 digit 11mm highdisplay & 31 segmentbargraph.u Optional backlight &BA490 external rotaryencoder.u IP66 frontu Easy on-site scalecard installation.u 96 x 48mm DINenclosure.u 3 year guaranteewww.beka.co.uk/ba427eBEKA associates Ltd. Old Charlton Rd.Hitchin, Hertfordshire, SG5 2DA, U.K.Tel. (01462) 438301 Fax (01462) 453971e-mail sales@beka.co.uk www.beka.co.uk

SPECIFICATION DIMENSIONS (mm)OutputCurrentResistance3.0 to 22.0mAGreater than 1MΩRecommended panel cut-outPower supplyVoltageAccuracyControl resolutionTemperature effect6.1 to 30V10 to 30V when optional backlight isloop powered.1 least significant digit of the display, or 0.3µAwhichever is greater.Less than 2µA/°CPanel cut-outTo achieve an IP66 seal betweenthe instrument and the panel90 +0.5 / -0.0 x 43.5 +0.5 / -0.0DIN 43 70092.0 +0.8 / -0.0 x 45 +0.6 / -0.0DisplayType Liquid crystal, non-multiplexed 5 digit 11mmhigh with 31 segment bargraph.Zero Adjustable between 0 & ±99999 with 4mAoutput.Span Adjustable between 0 & ±99999 with 20mAoutput.65Decimal pointZero blankingDirection1 of 4 positions or absentBlanked apart from 0 in front of decimal point.Display may increase or decrease withincreasing 4/20mA output.967.5Push buttons(Function in operating mode)‘E’ and ▼ or ▲Scrolls output current down or up▼Shows display calibration with 4mA output.▲Shows display calibration with 20mA output.‘P’ Displays output current in mA, as a % of spanor provides access to pre-set outputs.Set point Station BA427EScalecard48Terminals foroptional backlightare shown in outlineIntrinsic safetyEurope ATEXCodeGroup II Category 1GDEx ia IIC T5 GaEx ia IIIC T80°C Da IP20Tamb = -40 to 70°CTERMINAL CONNECTIONSInput parametersUi30V dcIi200mAPi 0.84WCert. No.International IECExCodeCert. NoITS12ATEX27718X(Special conditions only apply for use inGroup IIIC conductive dusts)Ex ia IIC T5 GaEx ia IIIC T80°C Da IP20Tamb = -40 to 70°CIECEx ITS12.0084X(Special conditions only apply for use inGroup IIIC conductive dusts)USA ETLStandards ANSI/ISA 60079-0 &11 conforms to UL 9137th edition & UL 60079-0 & 11.IS Code IS CL I, Div 1, GP A, B, C, & D:CL I, ZN 0, AEx ia IIC T5 Ga.NI CodeFile 4008610Canada cETLFile 4008610NI CL I, DIV 2, GP A, B, C & D: CL II,DIV 2, GP E, F & G: CL III, T5.CL I, ZN 2, GP IIA, IIB, IIC, T5 Ta = 70°CEnvironmentalOperating temp -40 to 70°CStorage temp -40 to 85°CHumidityTo 95% at 40°C noncondensingVibrationReport availableEnclosureFront IP66, rear IP20EMCComplies with 2004/108/ECMechanicalTerminalsWeightScrew clamp for 0.5 to 1.5mm² cable,removable.0.2kgAccessoriesBacklightGreen, may be loop or separately powered.Loop powered Set point station + backlight supply 10 to 30V.Separately powered 9 to 30V at 22mA from IS interface12 13 14+ - - SeparatelypoweredLoop poweredCommonTerminals foroptional backlightPrinted scale cardTag legendBA490 rotary encoderHOW TO ORDER5 6 7ABCommonTerminals foroptional externalrotary encoder1 2 3 4+4/20mATerminals 2 & 4 areinternally linked forjoining return4/20mA wirePlease specifyModel numberBA427EDisplay at:4.000mAXXXXX Include position of20.000mA XXXXX decimal point & sign if negative *AccessoriesDisplay backlightScale cardTagExternal rotary encoderBlank card fitted to each Set Point Station canbe supplied typeset with specified engineeringunits.Specified tag number or application thermallyprinted onto rear of the instrument.Panel mounting IP65 sealed rotary encoderwhich provides analogue control of theBA427E output current. Complies with therequirements for Simple Apparatus.See separate datasheet.Please specify if requiredBacklightLegend requiredLegend requiredBA490* Will be set to display 0.00 at 4mA output and 100.00 at 20mA output if calibrationinformation is not supplied. Calibration can easily be changed on-site.02