MTL4546/C/Y – MTL5546/Y ISOLATING DRIVER

for 4–20mA HART® valve positioners with line fault detection

The MTLx546 accepts a 4/20mA floating signal from a safe-area controller

to drive a current/pressure converter (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 MTL4546C and the MTLx546Y are very similar

to the MTLx546 except that they provide open circuit detection only

(i.e. no short-circuit detection).