MTL4544D – MTL5544D

REPEATER POWER SUPPLY

single channel, 4/20mA, HART®

for 2- or 3-wire transmitters, two outputs

The MTLx544D provides a fully-floating dc supply for energising a

conventional 2- or 3-wire 4/20mA transmitter located in a hazardous

area, and repeats the current in other circuits to drive two safe-area

loads. For HART 2-wire transmitters, the unit allows bi-directional

transmission of digital communication signals superimposed on the

4/20mA loop current. Separately powered current sources, such

as 4-wire transmitters, can be connected but will not support HART

communication.

SPECIFICATION

See also common specification

Number of channels

One

Location of transmitter

Zone 0, IIC, T4–6 hazardous area if suitably certified

Div. 1, Group A hazardous location

Safe-area output

Signal range: 4 to 20mA

Under/over-range: 0 to 24mA

Safe-area load resistance

@ 24mA: 0 to 360Ω

@ 20mA: 0 to 450Ω

Safe-area circuit output resistance: > 1MΩ

Safe-area circuit ripple

< 50µA peak-to-peak

Hazardous-area input

Signal range: 0 to 24mA (including over-range)

Transmitter voltage: 16.5V at 20mA

Transfer accuracy at 20°C

Better than 15µA

Temperature drift

< 0.8µA/°C

Response time

Settles to within 10% of final value within 50µs

Communications supported

HART (terminals 1 & 2, output Ch 1 only)