MTL5544/S REPEATER POWER SUPPLY

MTL5544/S REPEATER POWER SUPPLY

The MTLx544 provides fully-floating dc supplies for energising two conventional 2-wire or 3-wire 4/20mA or HART transmitters located in a hazardous area, and repeats the current in other circuits to drive two safe-area loads. For smart transmitters, the unit allows bi-directional transmission of digital comunication signals superimposed on the 4/20mA loop current. Alternatively, the MTLx544S 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.
MTL5544/S REPEATER POWER SUPPLY

SPECIFICATION
See also common specification

Number of channels
Two
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 (MTLx 544)
      @ 24mA: 0 to 360Ω
      @ 20mA: 0 to 450Ω
    Safe-area load (MTLx544S)
      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 and 4 & 5 only)

MTL5544/S REPEATER POWER SUPPLY
LED indicator
   Green: power indication
Maximum current consumption (with 20mA signals)
   96mA at 24V dc
Power dissipation within unit (with 20mA signals)
   MTLx544 1.4W @ 24V dc
   MTLx544S 1.9W @ 24V dc
Safety description (each channel)
   Terminals 2 to 1 and 3, and 5 to 4 and 6:
   Uo=28V Io=93mA Po=651mW Um = 253V rms or dc
   Terminals 1 to 3 and 4 to 6:
   Simple apparatus ≤1.5V, ≤0.1A and ≤25mW; can be connected
   without further certification into any IS loop with an open-circuit
   voltage <28V

MTL5544/S REPEATER POWER SUPPLY
SIL capable
These models have been assessed for use in IEC 61508 functional safety applications.SIL2 capable for a single device (HFT=0) SIL3 capable for multiple devices in safety redundant configurations (HFT=1) See data on MTL web site and refer to the safety manual.