MTL5541

**MTL4541 / MTL4541S** 

## **MTL4541/S – MTL5541/S REPEATER POWER SUPPLY** 4/20mA, HART®, 2- or 3-wire transmitters 

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. 

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Hazardous area Safe area<br>6 12<br>5 11<br>4 10 MTL4541 MTL4541S<br>Com 3 I 9 + – Load –<br>Tx+ 4/20mA<br>4/20mAInput 21 I 78 – Load + +<br>13 14<br>20 to 35V dc<br>Vs+<br>Vs–<br>**----- End of picture text -----**<br>


## **MTL5541 / MTL5541S** 

## **SPECIFICATION** 

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FSM<br>FUNCTIONAL SAFETY<br>MANAGEMENT<br>IEC 61508:2010<br>**----- End of picture text -----**<br>


## _**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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Hazardous area Safe area<br>6 7<br>5 8<br>4 9 MTL5541 MTL5541S<br>ComTx+ 3 I 10 – + +<br>4/20mAInput 21 I 1211 4/20mA+ Load – Load –<br>13 Vs–<br>14 Vs+<br>20 to 35V dc<br>**----- End of picture text -----**<br>


## **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 

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SIL<br>2<br>IEC 61508:2010<br>SIL<br>3<br>IEC 61508:2010<br>**----- End of picture text -----**<br>


## **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._ 

The given data is only intended as a product description and should not be regarded as a legal warranty of properties or guarantee. In the interest of further technical developments, we reserve the right to make design changes. 

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**Eaton Electric Limited,** Great Marlings, Butterfield, Luton Beds, LU2 8DL, UK. 

Tel: + 44 (0)1582 723633 Fax: + 44 (0)1582 422283 E-mail: mtlenquiry@eaton.com www.mtl-inst.com 

© 2016 Eaton All Rights Reserved Publication No. 

EPSx541/S Rev6 010916 

**EUROPE (EMEA):** 

+44 (0)1582 723633   mtlenquiry@eaton.com **THE AMERICAS:** +1 800 835 7075   mtl-us-info@eaton.com 

**ASIA-PACIFIC:** 

+65 6 645 9888   sales.mtlsing@eaton.com 

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