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Choosing an isolator

The following guide is for users who require guidance on their choice of isolator for a new installation. For a given application the choice is between DIN-rail mounting (MTL5000/MTL5500 range) and backplane mounting (MTL4000/MTL4500 range) devices.

If additional guidance is required, contact your local representative.

Analogue Inputs (high level)
  • 2-wire transmitters, 4-20mA conventional and ‘smart’
  • vibration transducer
  • loop isolator
    • Analogue Inputs (low level)
  • thermocouples and mV sources
  • 2, 3 and 4-wire RTDs
  • strain-gauge bridges
    • Analogue Outputs
  • controller outputs (I/P converters)
    • Digital (ON/OFF) Inputs
  • switches/proximity detectors
    • Digital (ON/OFF) Outputs
  • switches, proximity detectors, SIL3
  • alarms, LEDs, solenoid valves, etc.
  • switch output to hazardous area
    • Pulse Input
  • turbine/flowmeters
    • Miscellaneous
  • fire/smoke detectors
  • signal transfer
  • trip amplifiers
  • earth leakage detector
    •


    Analogue Input - 2-wire transmitters, 4-20mA conventional and ‘smart’

    Device

    No. of

    channels

    Output to

    hazardous area

    		 Important features
    DIN-rail mounting devices
    MTL5541

    1

    16.5V min.

    @ 20mA

    Compatible with most smart transmitters

    MTL5541A 1 8.6V diode

    Separately powered smart transmitters

    MTL5541AS 1 8.6V diode 4 wire smart transmitters, current sink output
    MTL5541S 1

    16.5V min.

    @20mA

    		 Compatible with most smart transmitters, current sink output
    MTL5544 2

    16.5V min

    @ 20mA

    Compatible with most smart transmitters

    MTL5544A

    2

    		 8.6V diode Separately powered smart transmitters
    MTL5544AS 2 8.6V diode 4 wire smart transmitters, current sink output
    MTL5544D 1

    16.5V min

    @ 20mA

    Compatible with most smart transmitters, repeat output

    MTL5544S 2

    16.5V min

    @ 20mA

    Compatible with most smart transmitters, current sink output

    Backplane mounting devices
    MTL4541 1

    16.5V min

    @ 20mA

    		 Compatible with most smart transmitters
    MTL4541A 1 8.6V diode

    Separately powered smart tranmitters

    MTL4541AS 1 8.6V diode

    4 wire smart transmitter, current sink output

    MTL4541B 1

    16.5V min

    @ 20mA

    As MTL4541 but adapted for MTL4041B substitution on legacy backplanes

    MTL4541P 1

    17.6V min

    @ 20mA

    As MTL4541B but with a higher power output, MTL4041P substitution on legacy backplanes

    MTL4541S 1

    16.5V min

    @ 20mA

    Compatible with most smart transmitters, current sink output

    MTL4544 2

    16.5V min

    @ 20mA

    		 Compatible with most smart transmitters
    MTL4544A

    2

    		 8.6V diode

    Separately powered smart transmitters

    MTL4544AS 2 8.6V diode

    4 wire smart transmitters, current sink output

    MTL4544B

    		1

    16.5V min

    @ 20mA

    		 As MTL4544 but adapted for MTL4044B substitution on legacy backplanes
    MTL4544D 1

    16.5V min

    @ 20mA

    		 Compatible with most smart transmitters, repeat output


    Analogue Input - vibration transducer

    Device

    No. of

    channels

    		 Signal monitored Main features
    DIN-rail mounting devices
    MTL5531 1

    Vibration

    transducer

    Compatible with vibration and accelerometer transducers

    Backplane mounting devices
    MTL4531 1

    Vibration

    transducer

    Compatible with vibration and accelerometer transducers


    Analogue Input - thermocouple and mV sources

    Device

    No. of

    channels

    Output to

    safe area

    		 Main features
    DIN-rail mounting devices
    MTL5573 1 4/20mA Configurable, built-in CJC, early burnout detection facility
    MTL5575 1 4/20mA

    Configurable, built-in CJC, early burnout detection facility, alarm output

    MTL5576-THC 2 4/20mA

    Configurable, built-in CJC, also config as 1in 2 out

    MTL5581 1 0 to ±50mV

    Selectable upscale or downscale

    Backplane mounting devices
    MTL4573 1 4/20mA Configurable, built-in CJC, early burnout detection facility
    MTL4575 1 4/20mA

    Configurable, built-in CJC, early burnout detection facility, alarm output

    MTL4576-THC 2 4/20mA Configurable, built-in CJC, also config as 1in 2 out
    MTL4581 1 0 to ±50mV Selectable upscale or downscale


    Analogue Input - 2, 3 and 4-wire RTDs

    Device

    No. of

    channels

    Output to

    safe area

    		 Main features
    DIN-rail mounting devices
    MTL5573 1 4/20mA Configurable, many sensor types and ranges
    MTL5575 1 4/20mA

    Configurable, many sensor types and ranges, alarm output

    MTL5576-RTD

    2

    		 4/20mA

    Configurable, also config as 1in 2 out

    MTL5582B 1 10 to 400 ohm Independent selection of 2, 3 or 4-wire RTDs on safe and hazardous area sides
    Backplane mounting devices
    MTL4573 1 4/20mA Configurable, many sensor types and ranges
    MTL4575 1 4/20mA Configurable, many sensor types and ranges, alarm output
    MTL4576-RTD 2 4/20mA

    Configurable, also config as 1in 2 out


    Analogue Output - controller outputs, I/P converters

    Device

    No. of

    channels

    Output to

    hazardous area

    		 Important features
    DIN-rail mounting devices
    MTL5546 1 1mA

    Vmax = 16V

    <24ma

    		 Suitable for HART valve positioners, SC & OC LFD
    MTL5546Y 11mA

    Vmax = 16V

    <24ma

    		 Suitable for HART valve positioners, OC LFD
    MTL5549 2 1mA

    Vmax = 16V

    <24ma

    		 Suitable for HART valve positioners, SC & OC LFD
    MTL5549Y 2 1mA

    Vmax = 16V

    <24ma

    		 Suitable for HART valve positioners, OC LFD
    Backplane mounting devices
    MTL4546 1 1mA

    Vmax = 16V

    <21.4ma

    		 Suitable for HART valve positioners, SC & OC LFD
    MTL4546Y 1 1mA

    Vmax = 16V

    <26ma

    		 Suitable for HART valve positioners, OC LFD
    MTL4549 2 1mA

    Vmax = 16V

    <26ma

    		 Suitable for HART valve positioners, SC & OC LFD
    MTL4549Y 2 1mA

    Vmax = 16V

    <24ma

    		 Suitable for HART valve positioners, OC LFD


    Digital Input - switches / proximity detectors

    Device

    No. of

    channels

    Output to

    safe area

    		 Important features
    DIN-rail mounting devices
    MTL5510 4 4 x solid state Can switch +ve or –ve polarity signals
    MTL5510B 4 4 x solid state Mult-function selectable
    MTL5511 1 1 x SPDT Switch/proximity detector repeater
    MTL5513 2 2 x solid state dc to 500Hz frequency response
    MTL5514 1

    1 x SPDT

    1 x SPDT

    Switch/proximity detector repeater

    Independent LFD output

    MTL5514D 1 2 x SPDT Dual output switch/proximity detector repeater
    MTL5516C 2 2 x SPDT Switch/proximity detector repeater
    MTL5517 2

    2 x SPDT

    1 x SPDT

    Switch/proximity detector repeater

    Independent LFD output

    Backplane mounting devices
    MTL4504 1

    1 x SPDT

    1 x SPDT

    Switch/proximity detector repeater

    Independent LFD output, de-energise to alarm

    MTL4510 4 4 x solid state Can switch +ve or –ve polarity signals
    MTL4510B 4 4 x solid state

    Mult-function selectable
    switches +ve, -ve or ac signals

    MTL4511 1 1 x SPDT Switch/proximity detector repeater
    MTL4513 2 2 x solid state

    dc to 500Hz frequency response

    MTL4514 1

    1 x SPDT

    1 x SPDT

    Switch/proximity detector repeater

    Independent LFD output, energise to alarm

    MTL4514D 1 2 x SPDT Dual output switch/proximity detector repeater
    MTL4516 2 2 x SPST Switch/proximity detector repeater
    MTL4516C 2 2 x SPDT Switch/proximity detector repeater
    MTL4517 2

    2 x SPST

    1 x SPDT

    Switch/proximity detector repeater

    Independent LFD output


    Digital Input - switch/proximity detectors, SIL3

    Device

    No. of

    channels

    		 Signals monitored Important features
    DIN-rail mounting devices
    MTL5501-SR 1 24V logic

    Safety related, SIL3 certified

    Backplane mounting devices
    MTL4501-SR 1 24V logic

    Safety related, SIL3 certified


    Digital Output - alarms, LEDs, solenoid valves, etc

    Device

    No. of

    channels

    Output to

    hazardous area

    		 Important features
    DIN-rail mounting devices
    MTL5521 1 12.8V

    Imax = 48mA

    <24v

    		 IIC gas groups, loop powered
    MTL5522 1 9.9V

    Imax = 70mA

    <21.4v

    		 IIB gas groups, loop powered
    MTL5523 1 12.8V

    Imax = 48mA

    <24v

    		 Switch controlled input, Independent LFD output
    MTL5523V 1 12.8V

    Imax = 48mA

    <24v

    		 Voltage controlled input, Independent LFD output
    MTL5524 1 12.8V

    Imax = 48mA

    <24v

    		 Safety override feature, separately powered
    MTL5525 1 7V

    Imax = 48mA

    <24v

    Low power output, loop powered

    Backplane mounting devices
    MTL4521 1 12.8V

    Imax = 48mA

    <24v

    		 Loop powered
    MTL4521L 1 10.3V

    Imax = 48mA

    <24v

    		 Loop powered

    MTL4523

    MTL4523R

    		1 12.8V

    Imax = 48mA

    <24v

    		 Switch controlled input, Independent LFD output
    MTL4523L 1 12.8V

    Imax = 48mA

    <24v

    		 Loop powered, independent LFD output
    MTL4523V 1 12.8V

    Imax = 48mA

    <24v

    		 Voltage controlled input, Independent LFD output

    MTL4524 &

    MTL4524S

    		 1 12.8V

    Imax = 48mA

    <24v

    		 Safety override feature, separately powered
    MTL4525 1 7V

    Imax = 48mA

    <24v

    		 Safety override, low power output


    Digital Output - switch output to hazardous area

    Device

    No. of

    channels

    		 Signals monitored Important features
    DIN rail mounting devices
    MTL5526 1 or 2 2 x DPDT

    Safe-area switch input or loop powered.

    2ch or 1ch with 2 outputs

    Backplane mounting devices
    MTL4526

    1 or 2

    		 2 x DPDT

    Safe-area switch input or loop powered.

    2ch or 1ch with 2 outputs


    Pulse Input - turbine / flowmeters

    Device

    No. of

    channels

    Input from

    hazardous area

    		 Important features
    DIN-rail mounting devices
    MTL5532
    1
    Switch, proximity detector, current pulse, voltage pulse

    Voltage and current inputs from 2 or 3-wire transmitters

    configurable 4-20mA analogue output

    MTL5541 1 2-wire pulse e.g. 2-wire turbine and vortex flowmeters
    Backplane mounting devices
    MTL4532 1 1mA

    Vmax = 16V

    <21.4ma

    Voltage and current inputs from 2 or 3-wire transmitters
    configurable 4-20mA analogue output

    MTL4541 1 2-wire pulse e.g. 2-wire turbine and vortex flowmeters


    Fire / Smoke detectors

    Device

    No. of

    channels

    Output to

    hazardous area

    		 Important features
    DIN-rail mounting devices
    MTL5561 2 Loop powered 0–40mA, fire and smoke detectors
    Backplane mounting devices
    MTL4561 2 Loop powered 0–40mA, fire and smoke detector


    Signal transfer - safe area to safe area - via hazardous area

    Device

    pair

    No. of

    channels

    		 Signal transferred Important features
    DIN-rail mounting devices

    MTL5546Y &

    MTL5541A

    		 1

    4/20mA smart

    Driver

    Receiver

    MTL5526 &

    MTL5516C

    		 2 Status signals

    Driver, relay output

    Receiver, digital output

    MTL5051 1 RS232 or RS422 Either can be used as receiver or driver
    Backplane mounting devices

    MTL4546Y &

    MTL4541A

    		 1

    4/20mA smart

    Driver

    Receiver

    MTL4526 &

    MTL4516

    		 2 Status signals

    Driver, relay output

    Receiver, digital output


    Trip amplifiers

    Device

    No. of

    channels

    		 Signals monitored Important features
    DIN-rail mounting devices
    MTL5314 1 4/20mA Configurable, one or two alarms