MTL3000 Series interface units offered a compact and easy-to-use means for communicating safely with process measuring, indicating, actuating and local control equipment in hazardous areas. The comprehensive range of models included analogue, switch and serial-digital signals in both directions, amplifying or otherwise conditioning them as required and at the same time providing world wide certified explosion protection for equipment and wiring in all zones and all explosive atmospheres. It also provided an alternative to the shunt-diode safety barrier where isolation was essential or preferred or a high-integrity earth was not readily available.

 

The MTL5500 Series are the recommended replacements for this series.

MTL3043 DC ISOLATOR, 1/40mA for fire and smoke detectors.

The MTL3043 is similar in principle to the MTL3042, but with a higher current range for use primarily with fire and smoke detectors or similar high integrity switched-resistor systems. In these applications the unit shows, by a change in the safe-area current, when one of the detectors across the 2-wire circuit in a hazardous area has been triggered. With a suitable receiving instrument in use, line short circuits do not give a false alarm and – if an end-of-line resistor is added to the system – open circuits do not give the operator a false sense of security. Further, the isolation feature eliminates the multiple earths that can arise in conventional barrier systems when the supply is earthed, and permits earth faults in field wiring to be detected and cured while the unit continues working.

 

MTL3000 series

Product CodeDescription

MTL3011   Switch/proximity detector relay - volt-free contacts

MTL3012   Switch/proximity detector relay - solid state 

MTL3013   Switch/proximity detector relay - 2-channel 

MTL3014   Switch/proximity detector relay - dual outputs

MTL3021_22  Solenoid/alarm driver ~ IIC loop powered

MTL3041   Repeater power supply - 4/20mA for 2-wire transmitters 

MTL3042   DC isolator - 4/20mA loop powered for I/P converters

MTL3043   DC isolator - 1/40mA for fire and smoke detctors

MTL3045   Isolating driver - 4/20mA for I/P converters 

MTL3046B  Repeater power supply - for ‘smart’ transmitters

MTL3052   Digital isolator - for signals up to 10kHz

MTL3054   Communications isolator/ repeater

MTL3058_59  Serial data interface ~ RS232 general purpose

MTL3071   Temperature converter ~ THC or emf input

MTL3072   Temperature converter ~ 3-wire RTD input

MTL3073   Temperature converter ~ THC or RTD input

MTL3081   Millivolt isolator - for low-level inputs

MTL3099   Dummy isolator - for terminating and isolating unused cores 

MTL3992   High stability power supply