Mobrey ultrasonic liquid level detection systems ATEX

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Electrosensor head electronicsMost of the sensors on pages 4-5 can be specified withElectrosensor electronics. 1 MHz sensors with dualscrewed fittngs can be specified with head mountedelectronics housed in a tough nylon enclosure integralwith the sensor. A field adjustable gain potentiometer andan LED indicator, visible through the end cover to showsensor status are provided. A selector switch to set the16mA signal to occur either with the sensor wet or dry isalso provided. A terminal with PNP output allows directconnection to a PLC input via a third signal wire.Sensor head electronics are also available in an adjacentwall mounting enclosure, for use with any 1MHz or3.7MHz sensor. These elecronics are used where it is notpossible or desirable to mount the electronics directlyon the sensor. Connections between adjacent electronicsand sensor is by dual coaxial cable (maximum length10m).Head electronicsThe Electrosensor modelno. as selected frompage 16 includes headelectronics, code SSH.Adjacent electronics:MES3AISuitable sensor must beselected from page 16code U8H onlyHead mounted (integral) electronicsMounted in a tough glass filled nylon enclosureweatherproof to IP66/IP67 the head electronics drive thesensor and detect its state; either wet or dry.Connection is via the M16 cable gland (supplied).Removal of the housing cover reveals:• Adjustable gain potentiometer to set the sensor tosuit application conditions.• Mode selector switch.• Connections for control electronics.• LED to indicate sensor state (visible throughwindow in end cover)Adjacent mounted electronicsThe sensor drive and detector electronics are enclosed ina wall mounted IP65 polycarbonate box which is wiredto the sensor using dual co-axial cable (maximum length10m). Connection is via 2 M16 cable glands (supplied).Removal of the box lid reveals:• Sensor frequency selector switch (1Mhz or 3.7Mhz)• Coarse and fine grain adjustment to set the sensor tosuit application conditions.• Mode selector switch.• Connections for sensor and control electronics.• Output selector switch for 8-16mA current loopoperation. If PLC operation is selected, currentdrawn is set to approximately 8mA in both sensorstates (wet or dry).• LED to indicate sensor state (visible only when boxlid removed).SpecificationHazardous area Electrosensors are approved intrinsically safe ATEX II 1 G EExia IIC T4 (-40°C < Ta < +85°C)or approval T5 (-40°C < Ta < +40°C) and can be used with control room electronics(Page 9) or used in an intrisically safe system.Power input: 12 -24V DC from associated MES control room electronics or other suitably protected source.Sensing: Draws either 8 or 16mA on a current loop dependent upon sensor state and mode switchsetting.Mode selector Gives choice of current level for sensor state. Would typically be set for 16mA with sensor switchoscillating (i.e gap sensor wet, Hi-sens dry)Output selection Both types of head amplifier have a transistor output on a third terminal, suitable forsignalling to a PLC or similar device. This transistor output switches upto 30mA at thesupply line voltage onto the third wire.Ambient temp. - 40°C to + 60°CEarthing Head electronics are floating with respect to sensor body. Sensor body may be earthedthrough tank connection.Plant cabling Standard twisted pair instrument cable recommended with screen (screen not connected athead electronics). Maximum loop resistance 30 ohms. Cable parameters must conform toATEX requirements.Users own Electrosensors on this page can be used in any intrinsically safe system.electronics The user must ensure that suitable safety barriers are used.10
Electrosensor ordering informationMES3L control roomelectronicsElectrosensor fitted with headamplifierMES2D control roomelectronicsElectrosensor with adjacentamplifierCustomers own controlelectronicsZenersafety barriersHAZARDOUS AREASAFE AREAOrdering information - control room electronicsMESMobrey ElectrosensorCode Approvals3 Intrinsically safe (type L enclosure only)2 Non I SCode EnclosureD DIN rail enclosure (requires external safety barriers for IS use)L Stand alone enclosureCode Voltage input1 230V ac MES3L only2 115V ac MES3L only3 24V dc (non I S)Code Relay outputS SPCO MES 3 L / 1 S Typical model numberOrdering information - control room electronicsSensor Fold out page 16 Select type ***SDU8H*Head amplifier MES3AIOrdering information - control room electronicsSensor/amplifier Fold out page 16 Select type ***SDSSH*11
Page 1 and 2: Technical specification sheetIP201F
Page 4 and 5: Ultrasonic point level sensors : Di
Page 6 and 7: Sensor technical dataStandard senso
Page 8 and 9: Mobrey standard industrial control
Page 12 and 13: Section 5 - Electropulse systems2 w
Page 14 and 15: Elecropulse sensor head amplifier u
Page 17 and 18: Ordering informationAdjacent amplie

Mobrey ultrasonic liquid level detection systems ATEX

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