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 (To be discontinued) |
| 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 |
| MTL5581 | 1 | 0 to ±50mV | Selectable upscale or downscale (available 2011Q4) |
| 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 |
| MTL4581 | 1 | 0 to ±50mV | Selectable upscale or downscale (available 2011Q4) |
| 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 |
| MTL5582 | 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 Output - controller outputs, I/P converters | |||
| Device | No. of channels |
Output to hazardous area |
Important features |
| DIN-rail mounting devices | |||
| MTL5546 | 1 | 1mA | Suitable for HART valve positioners, SC & OC LFD |
| MTL5546Y | 1 | 1mA | Suitable for HART valve positioners, OC LFD |
| MTL5549 | 2 | 1mA | Suitable for HART valve positioners, SC & OC LFD |
| MTL5549Y | 2 | 1mA | Suitable for HART valve positioners, OC LFD |
| Backplane mounting devices | |||
| MTL4546 | 1 | 1mA | Suitable for HART valve positioners, SC & OC LFD |
| MTL4546Y | 1 | 1mA | Suitable for HART valve positioners, OC LFD |
| MTL4549 | 2 | 1mA | Suitable for HART valve positioners, SC & OC LFD |
| MTL4549Y | 2 | 1mA | 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 | |||
| 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 1kHz frequency response switches +ve, -ve or ac signals |
| MTL4514 | 1 | 1 x SPDT 1 x SPDT |
Switch/proximity detector repeater Independent LFD output, energise to alarm |
| 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 | IIC gas groups, loop powered |
| MTL5522 | 1 | 9.9V | IIB gas groups, loop powered |
| MTL5523 | 1 | 12.8V | Switch controlled input, Independent LFD output |
| MTL5523V | 1 | 12.8V | Voltage controlled input, Independent LFD output |
| MTL5524 | 1 | 12.8V | Safety override feature, separately powered |
| MTL5525 | 1 | 7V | Safety override, low power output |
| Backplane mounting devices | |||
| MTL4521 | 1 | 12.8V | Loop powered |
| MTL4521L | 1 | 10.3V | Loop powered |
| MTL4523 MTL4523R |
1 | 12.8V | Switch controlled input, Independent LFD output |
| MTL4523L | 1 | 12.8V | Loop powered, independent LFD output |
| MTL4523V | 1 | 12.8V | Voltage controlled input, Independent LFD output |
| MTL4524 & MTL4524S |
1 | 12.8V | Safety override feature, separately powered |
| MTL4525 | 1 | 7V | 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 | 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 | 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 |
Contact Person: Ms. Steven
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