MTL4549/C/Y – MTL5549/Y
ISOLATING DRIVER
two-channel, for 4–20mA, HART®
valve positioners with line fault detection

The MTL5549 accepts 4/20mA floating signals from safe-area controllers
to drive 2 current/pressure converters (or any other load up to 800Ω) in
a hazardous area. For HART valve positioners, the module also permits
bi-directional transmission of digital communication signals. Process
controllers with a readback facility can detect open or short circuits
in the field wiring: if these occur, the current taken into the terminals
drops to a preset level. The MTL4549C and MTLx549Y are very similar
to the MTLx549 except that they provide open circuit detection only
(i.e. no short-circuit detection).