MTL5541 REPEATER
POWER SUPPLY
4/20mA, smart, for 2- or 3-wire
transmitters

The MTL5541 provides a fully-floating dc supply for energising a

conventional 2- or 3-wire 4/20mA transmitter which is located in a
hazardous area, and repeats the current in another floating circuit to
drive a safe-area load. For smart 2-wire transmitters, the unit allows
bi-directional communications signals superimposed on the 4/20mA
signal.

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: 0 to 360Ω @ 24mA
0 to 450Ω @ 20mA
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 only)
LED indicator
Green: power indication
Maximum current consumption (with 20mA signal)
51mA at 24V
Power dissipation within unit (with 20mA signal)
0.7W at 24V
Safety description
Terminals 2 to 1 and 3:
Vo=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
Terminal Function
1 Current input
2 Transmitter supply +ve
3 Common
10 Output +ve via 220Ω for HART apps.
11 Output –ve
12 Output +ve
13 Supply –ve

14 Supply +ve