MTL646/647 Intrinsically Safe Indicator

Certifications and compliances

ATEX approved

• Zone 0 mounting
• Group IIC
• T5 temperature classification
• Certified for -40°C to +60°C

CE marked for compliance with EMC, ATEX and RoHS Directives

• IS display certified to ATEX
• IP65 front panel
• High contrast LCD incorporates a green backlight that is powered by the serial data link. Brightness and contrast are adjustable enabling the display to be read in all lighting conditions from full sunlight to total darkness
• Data and power are normally supplied by a 2-wire serial data link from an MTL5051 isolator in the safe area. This isolator, which can power and communicate with up to two MTL646/647 serial text displays, has a bi-directional RS232 or RS422 safe area port.
• Six push-buttons on the front panel of the MTL646 (four on the MTL647) may be used for operator acknowledgments or controls. 
• Two isolated switch outputs, which can control certified hazardous area loads such as sounders, lamps and valves, are included
• Five different operational modes are selectable, allowing the user to choose the appropriate level of communications security for each application. These range from immediate execution of a command with no message acknowledgement, to a 16 bit CRC. 
• Text displays are normally controlled by a safe area process computer or by a dedicated instrument such as a PLC or weighing system. The text displays may be used singly but up to four instruments can be multidropped on a hazardous area network. 
• The legacy protocol enables the MTL646 or MTL647 to replace an MTL643 or MTL644, in order to provide certification to ATEX and a display backlight. No software or galvanic isolator changes are required and the MTL646 will fit into the existing panel cut-out. If required, simple modifications to the driver software will allow the enhanced features of the MTL646/647 to be used