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)