MTL4541/S – MTL5541/S REPEATER POWER SUPPLY MTL 4541 Safety Barries

MTL4541/S – MTL5541/S REPEATER POWER SUPPLY MTL 4541 Safety Barries

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.

MTL4541/S – MTL5541/S REPEATER POWER SUPPLY MTL 4541 Safety Barries
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

MTL4541/S – MTL5541/S REPEATER POWER SUPPLY MTL 4541 Safety Barries
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)

MTL4541/S – MTL5541/S REPEATER POWER SUPPLY MTL 4541 Safety Barries

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

MTL4541/S – MTL5541/S REPEATER POWER SUPPLY MTL 4541 Safety Barries