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The MTLx541 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 H
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The MTLx541 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 HART 2-wire transmitters, the unit allows
bi-directional communications signals superimposed on the 4/20mA
loop current. Alternatively, the MTLx541S acts as a current sink for
a safe-area connection rather than driving a current into the load.
Separately powered current sources, such as 4-wire transmitters, can
be connected but will not support HART communication.




LED indicator
Green: power indication
Maximum current consumption (with 20mA signal)
51mA at 24V
Power dissipation within unit (with 20mA signal)
MTLx541 0.7W @ 24V dc
MTLx541S 1.0W @ 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
SIL capable
These models have been assessed for use in IEC 61508 functional
safety applications. See data on MTL web site.
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 (MTLx541)
@ 24mA: 0 to 360Ω
@ 20mA: 0 to 450Ω
Safe-area load (MTLx541S)
Current sink: 600Ω max.
Maximum voltage source: 24V dc
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)

 

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