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Intrinsically Safe Ethernet takes data into hazardous areas
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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 Series) and backplane mounting (MTL4000/MTL4500 Series) devices.

If additional guidance is required, contact your local MTL 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 4 wire smart transmitters
    MTL5541AS 1 8.6V diode 4 wire smart transmitters, current sink output
    MTL5544 2
    16.5V min
    @ 20mA
    		 Compatible with most smart transmitters
    MTL5544A 2
    		 8.6V diode 4 wire 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 4 wire 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    		 Suitable for conventional and smart transmitters, current sink output
    MTL4544 2 16.5V min
    @ 20mA    		 Compatible with most smart transmitters
    MTL4544A 2
    		 8.6V diode 4 wire 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
    MTL5533 2 Vibration
    transducer    		 Compatible with vibration and accelerometer transducers
    Backplane mounting devices
    MTL4531 1 Vibration
    transducer    		 Compatible with vibration and accelerometer transducers
    MTL4533 2 Vibration
    transducer    		 Compatible with vibration and accelerometer transducers

    Analogue - loop isolator
    Device No. of
    channels    		 Output to
    hazardous area    		 Main features
    DIN-rail mounting devices
    MTL5040 1 x AI +
    1 x AO    		 16.5V @ 20mA
    Vmax 11V @ 20mA    		 Analogue input and output module

    Analogue Input - thermocouple and mV sources
    Device No. of
    channels    		 Output to
    safe area    		 Main features
    DIN-rail mounting devices
    MTL5575 1 4/20mA Configurable, built-in CJC, early burnout detection facility
    MTL5576-THC 2 4/20mA Configurable, built-in CJC, also config as 1in 2 out
    MTL5081 1 0 to ±50mV Selectable upscale or downscale
    Backplane mounting devices
    MTL4575 1 4/20mA Configurable, built-in CJC, early burnout detection facility
    MTL4576-THC 2 4/20mA Configurable, built-in CJC, also config as 1in 2 out
    MTL4081 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
    MTL5575 1 4/20mA Configurable
    MTL5576-RTD 2
    		 4/20mA Configurable, also config as 1in 2 out
    MTL5082 1 10 to 400 ohm Independent selection of 2, 3 or 4-wire RTDs on safe and hazardous area sides
    Backplane mounting devices
    MTL4575 1 4/20mA Configurable, many sensor types and ranges
    MTL4576-RTD 2 4/20mA Configurable, also config as 1in 2 out

    Analogue Input - strain-gauge bridges
    Device No. of
    channels    		 Output to
    safe area    		 Main features
    Backplane mounting devices
    MTL4081 1 0 to ±50mV For monitoring bridge voltage
    MTL4083 1 0 to +12V Can be used with MTL4081 for monitoring bridge supply

    Analogue Output - controller outputs, I/P converters
    Device
    No. of
    channels
    Output to
    hazardous area
    		 Important features
    DIN-rail mounting devices
    MTL5546

    1
    1mA <Io<24mA
    Vmax = 16V
    		 Suitable for HART valve positioners, SC & OC LFD
    MTL5546Y 1 1mA <Io<24mA
    Vmax = 16V    		 Suitable for HART valve positioners, OC LFD
    MTL5549 2 1mA <Io<24mA
    Vmax = 16V    		 Suitable for HART valve positioners, SC & OC LFD
    MTL5549Y 2
    		 1mA <Io<24mA
    Vmax = 16V    		 Suitable for HART valve positioners, OC LFD
    Backplane mounting devices
    MTL4546 1 1mA <Io<21.4mA
    Vmax = 16V    		 Suitable for HART valve positioners, SC & OC LFD
    MTL4546Y 1 1mA <Io<26mA
    Vmax = 16V    		 Suitable for HART valve positioners, OC LFD
    MTL4549 2
    		 1mA <Io<26mA
    Vmax = 16V    		 Suitable for HART valve positioners, SC & OC LFD
    MTL4549Y 2
    		 1mA <Io<24mA
    Vmax = 16V    		 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 1kHz frequency response
    MTL5514 1 1 x SPDT
    1 x SPDT    		 Switch/proximity detector repeater
    Independent LFD output
    MTL5516C 2 2 x SPDT Switch/proximity detector repeater
    MTL5517 2 2 x SPDT
    1 x SPDT    		 Switch/proximity detector repeater
    Independent LFD output
    MTL5014 2 1 x SPDT
    1 x SPDT    		 Switch/proximity detector repeater
    Phase reversal, selectable repeat output or LFD alarm
    Backplane mounting devices
    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 1kHz frequency response
    switches +ve, -ve or ac signals
    MTL4514 1 1 x SPDT
    1 x SPDT    		 Switch/proximity detector repeater
    Independent LFD output
    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<Vo<24V
    Imax = 48mA    		 IIC gas groups, loop powered
    MTL5522 1 9.9V<Vo<21.4V
    Imax = 70mA    		 IIB gas groups, loop powered
    MTL5523 1 12.8V<Vo<24V
    Imax = 48mA    		 Independent LFD output
    MTL5524 1 12.8V<Vo<24V
    Imax = 48mA    		 Safety override feature, separately powered
    MTL5525 1 7V<Vo<24V
    Imax = 48mA    		 Safety override, low power output
    Backplane mounting devices
    MTL4521 1 12.8V<Vo<24V
    Imax = 48mA    		 Loop powered
    MTL4521L 1 10.3V<Vo<24V
    Imax = 48mA    		 Loop powered
    MTL4523
    MTL4523R     		1 12.8V<Vo<24V
    Imax = 48mA    		 Independent LFD output
    MTL4523L 1 12.8V<Vo<24V
    Imax = 48mA    		 Loop powered, independent LFD output
    MTL4524 &
    MTL4524S    		 1 12.8V<Vo<24V
    Imax = 48mA    		 Safety override feature, separately powered
    MTL4525 1 7V<Vo<24V
    Imax = 48mA    		 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
    MTL4513 2 Switch, proximity detector e.g. 2-wire positive displacement flowmeters
    MTL4532 1 1mA <Io<21.4mA
    Vmax = 16V

    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
    Receiver
    MTL5051 &
    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
    Receiver

    Trip amplifiers
    Device No. of
    channels    		 Signals monitored Important features
    DIN-rail mounting devices
    MTL5314 1 4/20mA Configurable, one or two alarms

    Earth-leakage detector
    Device No. of
    channels    		 Output to
    safe area    		 Important features
    Backplane mounting devices
    MTL4220 8 1 x SPST

    Can monitor up to 8 loops,
    use BPS04 or 08 backplane