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MTL5544D REPEATER POWER SUPPLY

single channel, 4/20mA, HART® for 2- or 3-wire transmitters, two outputs

The MTL5544D 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)

LED indicator

Green: power indication

Maximum current consumption (with 20mA signals)

96mA at 24V dc

Power dissipation within unit (with 20mA signals)

1.4W @ 24V dc

Safety description

Terminals 2 to 1 and 3:

Uo=28V Io=93mA Po=651mW Um = 253V rms or dc

Terminals 1 to 3:

Simple apparatus ≤1.5V, ≤0.1A and ≤25mW; can be connected

without further certification into any IS loop with an open-circuit

voltage <28V

MTL5500 series :