MTL4544 MTL Instrument Repeater Power Supply

MTLx544 provides fully-floating dc supplies for energising twoconventional 2-wire or 3-wwire 4/20mA or HART transmitters located ina hazardous area, and repeats the current in other circuits to drive twosafe-area loads.For smart transmitters, the unit allows bi-directionaltransmission of digital communication signals superimposed on the4/20mA loop current, Alternatively, the MTLx544S acts as a currentsink for a safe-area connection rather than driing a current into theload. Separately powered current sources, such as 4-wire transmitterscan be connected but will not support HART communication.

Specification

• Product Type : Repeater Power Supply

• 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 360?

    @ 20mA : 0 to 450?

  • Safe-area load (MTLx544S)

    Current sink: 600? max.

    Maximum voltage source: 24V dc

  • Safe-area circuit output resistance: > 1M?

• 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)

• 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

• Dimensions ( W x H ) : 1.58 cm x 10.98 cm x 12.36 cm

• Weight : Approx. 0.11 Kg

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