Technical Datasheettechnical Datasheet MTL700 Series

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technicaltechnical datasheetdatasheetMTL700 Seriesfor safe measurement and control in hazardous areas 1 or 2 channels in same package Electronic protection prevents blownfuses Higher-power barriers for group IICand IIB gases All models short-circuit proof Fixed tagging & cable-screen earthingaccessories Certified to worldwide standardsMTL700 Series shunt-diode safetybarriers are 1- or 2-channel devices whichpass an electrical signal in either directionwithout shunting it, but limit the transfer ofenergy to a level that cannot ignite explosiveatmospheres. Connected in series withthe signal transmission lines on a processplant, they protect hazardous-area wiringand equipment against faults occurring inthe safe area, and enable a wide range ofmeasurement and control operations tobe carried out simply and inexpensively byintrinsically safe techniques.Applications include the protection ofinstallations containing ‘simple’ uncertifieddevices such as thermocouples, switches,and resistive sensors, or separately certified‘energy storing’ or ‘voltage producing’apparatus, for example ac sensors,transmitters, and current-to-pneumatic (I/P)converters.Essential features of the MTL700 Seriesare the self checking ‘as-you-mount-it’earthing via two studs directly to nickelplated brass or copper busbar. The earthconnection is on top of the unit, allowingeasy inspection, installation and removal.EPS700 Rev3 010213www.mtl-inst.comenquiry@mtl-inst.comThe shape of the barrier has been designedfor easy wiring, while the common (14.5 mm)space requirement of both 1- and 2-channelunits simplifies planning or alteration ofinstallations of all sizes. The busbar isinsulated for separate earthing, to eliminatethe danger of invasion by fault currents.MTL700P shunt-diode safety barriersdeliver more power into hazardous areas.Because of the higher power levels available,it is important when considering the use ofMTL700P barriers to check the compatibilityof the electrical safety parameters of the fieldequipment (such as transmitters and solenoidvalves) with those of the barriers to makesure the combination is safe. In addition,with the barriers designed for IIB gas groupapplications, the overall gas classification ofthe system also needs checkingReferences. The following documents areavailable for further information on MTL700Series barriers:AN9007 A user’s guide to shunt-diode safetybarriersINM700ManualThe MTL700 Series Instruction

SpecificationsModelNo.MTL‘Key’ barriers shown in afety description nsmitters, switches,controller outputsSolenoids, alarms, LEDs, switches33333333333333333333*1ac42Gas detectors13 (26V:796)Strain-gaugebridgesStrain-gauge bridges33233314Active dc & ac sensors(low impedance receivers)Resistance temperaturedetectors3SafeSee "HOW THEY WORK"and"OVERVOLT-PROTECTEDBARRIERS"6V dc & 4V ac systems8V dc systems12V systems12V dc systems18V dc systems18V dc systemsController outputs, solenoidsTransmittersController outputs, solenoid valvesController outputs, solenoid valves33Basic circuit3*324 (20V:796)33Strain-gaugebridges12V dc systems3318V dc systems33Controller outputs33Vibration probes(MTL796 negative)Active dc & ac sensorsThermocouples33}(768 & 769 require channelsseparate in IIC)313ac32-wire dc & ac systems33Star Vwkg at10 (1) .026.626.6d26.026.0See atingmASee 'Howthey 353403406656652.2V 30Ω2.2V 18.024.024.025.525.53.67.07.07.57.58.18.110.7 e10.7 505050503402.2V 30Ω3400.9V 20Ω2580.9V .662.610V (at 50uA)-10V (at 50uA)10.5-10.5100100Signal diode93–93–119–33Controller outputs,switchesTransmittersController outputs, switches33787S42Transmitters, controller 2001111515121621633 (28V)3250Ω334 (10V)3331.25kbit/s Terminal1&2opencircuitDummy barrier for securing cables for future installations- takes hazardous-area circuits to earth.4a: Tolerance 0.15Ω at 20 C, channels track within 0.15Ω from –20 to 60 C.b: ac version 24.5V.c: ac version 7.4V.2d: ac version 26.1V.e: ac version 11.2V.† Gas group IIB (CENELEC), C (N America).* Diagrams show positive versions. All diodes reversed on negative versions. Additional diodes fitted on ac versions.Patents for MTL787S: UK Patent No. 2210522, USA Patent No. 4860151; Patents for MTL707P: UK Patent Nos. 2210521, 2210522; USA Patent No. 4860151;Patents for MTL787SP: UK Patent No. 2210522; USA Patent No. 4860151EUROPE (EMEA): 44 (0)1582 723633THE AMERICAS: 1 800 835 7075ASIA-PACIFIC: 65 6 487 tlsing.com.sgEPS700 Rev3 010213

HOW THEY WORKGENERAL SPECIFICATIONAll MTL700 Series barriers are based on the same simple principle.Each channel contains two stages of pulse-tested Zener or forwardconnected diodes and an ‘infallible’ terminating resistor. In the eventof an electrical fault in the safe area, the diodes limit the voltage thatcan reach the hazardous area and the resistor limits the current.A fuse protects the diodes, and the two stages of voltage limitationensure continued safety if either stage should fail. No active outputcurrent limiting circuits are employed. All models are certified ‘ia’ for allzones and ‘IIC’ for all explosive atmospheres (except MTL707P andMTL729P , 'ia' 'IIB').KEY BARRIER4. Working voltage (Vwkg)DIMENSIONS (mm)1. Safety descriptionThe safety description of a barrier, eg ‘10V 50Ω 200mA’, refers to themaximum voltage of the terminating Zener or forward diode while thefuse is blowing, the minimum value of the terminating resistor, and thecorresponding maximum short-circuit current. It is an indication of thefault energy that can be developed in the hazardous area, and not ofthe working voltage or end-to-end resistance.2. PolarityBarriers may be polarised or –, or non-polarised (‘ac’). Polarisedbarriers accept and/or deliver safe-area voltages of the specifiedpolarity only. Non-polarised barriers support voltages of either polarityapplied at either end. An exception to this is the MTL791 Fieldbusbarrier which has one positive and one negative channel.3. End-to-end resistance45. Maximum voltage (Vmax)3The greatest steady voltage, of appropriate polarity, that can beapplied between the safe-area terminal of a ‘basic’ barrier channel andearth at 20 C for the specified leakage current, with the hazardousarea terminal open circuit.2TERMINOLOGY1The resistance between the two ends of a barrier channel at 20 C, ieof the resistors and the fuse. If diodes or transistors are present, theirvoltage drop (transistors ON) is quoted in addition.Ambient temperature and humidity limits–20 to 60 C continuous working–40 to 80 C storage5–95% RHLeakage currentFor ‘basic’ barriers with a working voltage of 5V or more, theleakage current decreases by at least one decade per voltreduction in applied voltage below the working voltage, over twodecades. For the MTL755 it decreases by at least one decade fora 0.4V reduction in applied voltage.TerminationsTerminals accommodate conductors up to 4mm2 (12AWG)Hazardous-area terminals are identified by blue labels.Colour coding of barrier topGrey:non-polarisedRed:positive polarityBlack: negative polarityBlack(red label for safe-area terminals):positive supply, negative to transmitter (MTL706)White: dummy barrier, MTL799Weight125g approxMounting and earthingBy two integral M4 x 9 tin-lead plated steel fixing studs andstainless steel self-locking nuts (provided).EMC complianceEN 61326-1:2006(MTL707P is not CE marked. MTL706 smart transmittercommunications may be disrupted at high levels of radiated interference).25.0Hazardous-areaterminalsThe greatest steady voltage, of appropriate polarity, that can be appliedcontinuously between the safe-area terminal of any barrier channeland earth at 20 C without blowing the fuse. For ‘basic’ barriers, it isspecified with the hazardous-area terminal open circuit; if current isdrawn in the hazardous area, the maximum voltage for these barriersis reduced. The ‘ac’ channels of ‘basic’ barriers and most channels ofovervolt-protected barriers withstand voltages of the opposite polarityalso – see circuit 6. Fuse rating85.093.5The greatest current that can be passed continuously (for 1000 hoursat 35 C) through the fuse.14.2MTL700 SERIES KEY BARRIERS SUMMARISED7. Star connectionIn star-connected barriers, the two channels are interlocked such thatthe voltage between them cannot exceed the working voltage, Vwkg:this allows for higher cable capacitance or inductance.TYPEAPPLICATIONAnalogueinput (low-level)Resistance temperature detectorsThermocouples, ac sensors755ac760ac8. Maximum safe-area voltage (Um)Analogue outputController outputs, one line earthedController outputs, neither line earthed728 787S The maximum permissible safe-area voltage (Um) for MTL700 Seriesbarriers is 250V ac/dc.KEY BARRIERdc power supply26.0V20-35VAnalogueinput (high-level)787S 706 Digital (on/off)input787S 707 728 708 Digital (on/off) ioutputPatents for MTL706 , 707 , 708 , 787S The given data is only intended as a product description and should not be regarded as a legal warranty of properties or guarantee. In the interest of further technical developments, we reserve the right to make design changes.EUROPE (EMEA): 44 (0)1582 723633THE AMERICAS: 1 800 835 7075ASIA-PACIFIC: 65 6 487 tlsing.com.sgEPS700 Rev3 010213

ADDITIONAL PROTECTED BARRIERSThe 706 , 707 , 707P and 708 have built-in overvolt protection,allowing their use with unregulated power supplies. In manyapplications, e.g. sensor inputs or controller outputs, there isinsufficient power available to blow the barrier fuse and this additionalprotection is not necessary. However, where the barrier is connectedto a power supply, eg, for energising transmitters, switches, solenoidsor local alarms, overvolt protection allows the barriers to be used withunregulated supplies up to 35V dc and also gives protection againstfaulty wiring during commissioning.MTL706 for 'smart' 2-wire 4/20mA transmittersUK Patent No. 2205699USA Patent No. 4967302European Patent (Germany, France, Italy) No. EP 0 294 139 B1The MTL706 is a 1-channel shunt-diode safety barrier, with builtin electronic overvolt protection, for energising a 2-wire 4/20mAtransmitter in a hazardous area. It is powered from a positive supplyof 20–35V dc and delivers a 4/20mA signal into an earthed load inthe safe area. It is proof against short circuits in the field and in thesafe area and is extremely accurate. The MTL706 will pass incomingcommunication signals up to 10kHz from a ‘smart’ transmitter, while inthe outgoing direction it will pass signals of any frequency likely to beencountered.Since the MTL706 has no return channel for energising the load,the entire output of the single ‘28V’ channel is available to power thetransmitter, providing high output capability. This channel is negativelypolarised, and the safe-area signal is in fact the very current thatreturns through it from the hazardous area, the novel circuit beingenergised by a built-in floating dc supply derived from the external dcsource of power.Supply voltage20 to 35V dc, positive w.r.t. earthOutput current4 to 20mAVoltage available for transmitter and lines15V minimum at 20mA with 22V supply15.5V typical at 20mA with 24V supplyNote: voltages are negative w.r.t. earthLoad resistance250Ω 5% (can be greater if reduced transmitter voltage isacceptable)Accuracy 2µA under all conditionsSupply current35mA typical (at 20mA with 24V supply)40mA maximum (at 20mA with 35V supply)MTL707 for switch inputsUK Patent Nos. 2245439, 2210521European Patent No. EP 0 310 280 B1The MTL707 is a 2-channel shunt-diode safety barrier similar to theMTL787 but with built-in electronic overvolt protection. It is intendedprimarily for safeguarding a hazardous-area switch controlling a relay,opto-coupler or other safe-area load from an unregulated dc supply inthe safe area.The outgoing channel accepts supply voltages up to 35V and isprotected against reverse voltages: the return channel is unaffected byvoltages up to 250V.In normal operation the protection circuit introduces only a small voltagedrop and shunts less than 1mA to earth, so its overall effect is minimal.If the supply voltage exceeds about 27V, however, causing the Zenerdiodes to conduct – or if the safe-area load has a very low resistance –the supply current is limited automatically to 50mA, protecting the fuseand power supply and enabling the loop to continue working.BASIC CIRCUITHazardous areaTo prevent any leakage through the Zener diodes and maximisethe output voltage available at 20mA, the floating supply is given arising voltage/current characteristic. This is achieved by monitoringthe 4/20mA current, an arrangement which allows all-frequencycommunication in both directions. A separate circuit limits the currentto protect the fuse in the event of a short circuit in the hazardous area.With a 22V supply, the barrier will deliver 15V minimum at 20mA forthe transmitter and lines and consumes less than 40mA in normaloperation.Note: the MTL706 supercedes the MTL705 , which was similar in basicperformance but did not pass outgoing communication signals belowabout 1kHz.BASIC CIRCUITHazardous areaSafe area 35Vmax. 35Vmax.140mA maxmax40mANegative3Tx– Negative31Current limitCurrentlimitRegulate4450mA 22250Ω 5%25050mA 5%Safe area Current limit RegulateNegative3Tx50mA 50mA4 4/20mA– 35V max.140mA max 4/20mA50mA 2250Ω 5% 0VADDITIONAL SPECIFICATIONSupply voltage (Vs)10 to 35V dc, positive w.r.t. earthOutput current (Iout)Up to 35mA availableMaximum voltage drop (at 20 C, current not limited)Iout x 370Ω 1.5V, terminal 1 to 3Iout x 50Ω 2.1V, terminal 4 to 2Supply currentIout 1mA max, Vs 26VLimited at 50mA, Vs 28V or low load resistance0V0VEUROPE (EMEA): 44 (0)1582 723633THE AMERICAS: 1 800 835 7075ASIA-PACIFIC: 65 6 487 tlsing.com.sgEPS700 Rev3 010213

MTL708 for switched outputsUK Patent No. 2210521European Patent No. EP 0 310 280 B1Overvolt-protectedbarriersThe MTL708 is a 1-channel shunt-diode safety barrier similar to theMTL728 but with built-in electronic overvolt protection. It is intendedprimarily for safeguarding solenoids, alarms, light-emitting diodes orother hazardous-area loads controlled by a safe-area switch from anunregulated dc supply in the safe area.MTL707P for switch inputs, IIB gasesThe MTL707P is a two-channel shunt-diode safety barrier similarto the MTL787SP , but is designed for use with group IIB gasesand features built-in electronic overvolt protection allowing use withunregulated power supplies up to 35V dc. It is intended primarily asa low cost solution for driving IIB certified 2-wire 4/20mA transmitters,but can also be used with controller outputs with current monitoring,solenoid valves and switches. To protect the fuse and enable theloop to continue working, the supply current is limited automatically at50mA should the output be short-circuited or excess voltage applied.Hazardous areaHazardous areaSafe area40mA max3CurrentCurrent limitlimitRegulateNegativeTx32mAmaxI out4/20mA50mA– In normal operation the protection circuit introduces only a smallvoltage drop and shunts less than 1mA to earth, so its overall effectis minimal. If the supply voltage exceeds about 27V, however, causingthe Zener diodes to conduct – or if the hazardous-area load has avery low resistance – the supply current is limited automatically to50mA, protecting the fuse and power supply and enabling the loop tocontinue working.BASIC CIRCUITBASIC CIRCUITTx,switch,etc.The barrier accepts supply voltages up to 35V and is protectedagainst reverse voltages.4413maxCurrentCurrent limitlimitRegulateNegative50mA4/20mATx50mA 2250Ω 5% 35V max.140mA max 35V max.150mA 35V50mA 2Safe area– LED,alarm,solenoid,etc350mA 35Vmax4/20mA4/20mAIout1 mA max50mA450mA 150mA 2250Ω 5%420V0VADDITIONAL SPECIFICATIONADDITIONAL SPECIFICATIONSupply voltage – channel 1 (Vs)10 to 35V dc positive with respect to earthOutput current – channel 1 (I out)Up to 35mA availableMaximum voltage drop (at 20 C, current not limited)Iout x 200Ω 0.2V, terminals 1 to 3Iout x 18Ω 1.3V, terminals 4 to 2Supply currentIout 2mA max, Vs 25VLimited at 50mA, Vs 28V or low load resistanceSupply voltage (Vs)10 to 35V dc, positive w.r.t. earthOutput current (Iout)Up to 35mA availableMaximum voltage drop (at 20 C, current not limited)Iout x 370Ω 1.5V, terminal 1 to 3Supply currentIout 1mA max, Vs 26VLimited at 50mA, Vs 28V or low load resistanceEUROPE (EMEA): 44 (0)1582 723633THE AMERICAS: 1 800 835 7075ASIA-PACIFIC: 65 6 487 tlsing.com.sgEPS700 Rev3 010213

barriers for sensorsHazardous areaSafe area 2134Insulatedfrom earth10V10VRecorder,controller,data logger,computerFig. 1ANALOGUE INPUTS, LOW LEVELThermocouplesCompensating cableThe preferred barrier for thermocouples is the MTL760ac, whose2-channel non-polarised design retains the ‘earth-free’ nature of thesignal. Provided that the receiver’s input circuit floats, the combinationrejects common-mode ac and dc interference up to at least 6V andis unaffected by earth faults on the primary element. Even if thereceiver’s circuit is tied to its ‘0V’ rail, the use of a 2-channel barriertakes the worry out of earthing. To eliminate errors due to thermalemfs, the compensating cable should be continued from the barrier tothe receiver. For moving coil or other low resistance receivers, use theMTL751 (40Ω) or the MTL755ac (36Ω) if the resistance of the MTL760(170Ω) is unacceptable. 10V10V 21Photocell,microphone,turbineflowmeter, etc34USA regulations permit the thermocouple to be earthed on theassumption that the barrier will not conduct, but Europe and other‘IEC countries’ assume that it may do so. In these countries either thethermocouple and its cables must be insulated to withstand 500V, Fig.1; or the earth loop must be broken by an isolating transmitter, Fig. 2,or by one of the isolating interface devices in the MTL4500 or MTL5500series.EarthfreesignalFig. 3Photocells, ac sensors, flowmeters For 3-wire circuits with a floating bridge, the most economicalsolution is provided by the MTL755ac 2-channel barrier,Fig.4. The two leads from the bridge arms are protected by the barrier,while the third (supply) lead is earthed at the busbar. The MTL755achas a low end-to-end resistance of only 18.0Ω per channel to minimisespan changes, and i

766 12 150 80 3 185 10.0 11.2 50 12 150 80 185 10.0 11.2 50 766p 12 75 157 3 Strain-gauge 93 9.8 11.3 100 12 75 157 bridges 93 9.8 11.3 100 767 15 100 150 3 12V dc systems 155 12.0 13.0 100 15 100 150 155 12.0 13.0 100 768 22 150 147 3 18V dc systems 185 19.0 20.2 50 22 150 147 185 19.0 20

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