BASIC INFO
MTL3000 series MTL3021 – IIC, loop powered safety barrier has been discontinued for sale now.
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.
MTL3021 AND 3022, loop powered.
SOLENOID/ALARM DRIVERS
MTL3021 – IIC, loop powered
MTL3022 – IIB, loop powered
The MTL3021 enables a device in a hazardous area to be controlled by a switch or voltage change in the safe area. It can drive any
certified intrinsically safe, low-power load, for example a solenoid or alarm, as well as non-energy-storing ‘simple apparatus’ such as an LED. The unit’s input/output isolation allows field cables to be earthed and the control switch to be connected into either side of the 24V dc supply circuit. The MTL3022 is similar but provides more power for driving heavy-duty loads eg high-powered solenoid valves in areas where the explosion risk is limited to IIB atmospheres.
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
