MTL England origin MTL5500 range MTL5544AS provides an input for separately powered 4/20mA transmitters.

MTL5544AS 2 channel Transmitter repeater, passive input, current sink

MTL4544A/AS – MTL5544A/AS CURRENT REPEATER 4/20mA passive i/p for HART® transmitters The MTLx544A provides an input for separately powered 4/20mA transmitters and also allows bi–directional transmission of HART communication signals superimposed on the 4/20mA loop current, so that the transmitter can be interrogated either from the operator station or by a hand-held communicator (HHC). Alternatively, the MTLx544AS acts as a current sink for a safe-area connection rather than driving a current into the load.

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 loc ation

Hazardous area input

Signal range: 4 to 20mA

Under/over-range: 1.0 to 21.5mA

Input impedance for HART signals

at terminals 1, 2 and 4, 5: > 230Ω

Maximum input volt drop

at terminals 1, 2 and 4, 5: < 6.6V

i.e. a transmitter load of 330Ω at 20mA

Safe-area output

Signal range: 4 to 20mA

Under/over-range: 1.0 to 21.5mA

Safe-area load resistance (MTL5544A)

Conventional transmitters: 0 to 360Ω

Smart transmitters: 250Ω ±10%

Safe-area load (MTL5544AS)

Current sink: 600Ω max.

Maximum voltage source: 24V DC

Safe-area circuit output resistance: > 1MΩ

Safe–area circuit ripple

< 50µA peak-to-peak up to 80kHz

Transfer accuracy at 20°C

Better than 20µA

Temperature drift

< 1µA/°C

Response time

Settles within 200µA of final value after 20ms

Communications supported

HART

LED indicator

Green: power indication

Power requirement (with 20mA signal)

70mA at 24V

85mA at 20V

50mA at 35V

Power dissipation within unit (with 20mA signals)

MTLx544A 1.5W @ 24V dc

MTLx544AS 2.0W @ 24V dc

Safety description

Terminals 1 to 2 and 4 to 5:

Um = 253V rms or dc.

8.6V (diode). This voltage must be considered when calculating

the load capacitance.

Non-energy-storing apparatus ≤1.5V, ≤0.1A and ≤25mW; can be

connected without further certification into any IS loop with an opencircuit

voltage < 28V

MTL5500 Series Barriers

Part Number

MTL5501-SR, MTL5510, MTL5510B, MTL5511, MTL5513, MTL5514, MTL5514D, MTL5516C, MTL5517, MTL5521, MTL5522, MTL5523, MTL5523V, MTL5523VL, MTL5524, MTL5525, MTL5526, MTL5531, MTL5532, MTL5533, MTL5541, MTL5541A, MTL5541AS, MTL5541S, MTL5544, MTL5544A, MTL5544AS, MTL5544D, MTL5544S, MTL5546, MTL5546Y, MTL5549, MTL5549Y, MTL5561, MTL5575, MTL5576-RTD, MTL5576-THC, MTL5581, MTL5582

MTL5500 series

Part NumberDescription

Digital Input 　

MTL5501-SR 1ch DI failsafe solid-state output + LFD alarm

MTL55104ch DI solid-state ouput

MTL5510B4ch DI multifunction solid-state output

MTL55111ch DI relay output

MTL5513 2ch DI solid-state output

MTL5514 1ch DI relay output + LFD alarm

MTL5514D 1ch switch/prox input, dual output relay 

MTL5516C2ch DI with changeover relay output

MTL55172ch DI relay output + LFD alarm

Digital Output　

MTL5521Loop powered solenoid driver, IIC 

MTL5522 Loop powered solenoid driver, IIB  

MTL5523Solenoid driver with LFD 

MTL5523V - VL Solenoid/Alarm driver with voltage control 

MTL5524 Switch operated solenoid driver 

MTL5525Loop powered solenoid driver low power 

MTL55262ch switch operated relay   

Analogue Input　

MTL55411ch 2/3 wire Transmitter repeater 

MTL5541A 1ch Transmitter repeater, passive input

MTL5541AS1ch Transmitter repeater, passive input, current sink

MTL5541S1ch 2/3 wire Transmitter repeater, current sink 

MTL5544 2ch 2/3 wire Transmitter repeater 

MTL5544A 2ch Transmitter repeater, passive input 

MTL5544AS 2ch Transmitter repeater, passive input, current sink

MTL5544D1ch 2/3 wire Transmitter repeater, dual output

MTL5544S2ch 2/3 wire Transmitter repeater, current sink

Analogue Output　

MTL55461ch 4-20mA smart isolating driver + LFD

MTL5546Y 1ch 4-20mA smart isolating driver + oc LFD 

MTL55492ch 4-20mA smart isolating driver + LFD 

MTL5549Y2ch 4-20mA smart isolating driver + oc LFD

Temperature Input 　

MTL55751ch Temperature converter, RTD / THC with alarm

MTL5576-RTD2ch Temperature converter, RTD 

MTL5576-THC2ch Temperature converter, THC 

MTL55811ch mV/THC isolator for low-level signals

MTL55821ch resistance isolator 

Pulse and Vibration 　

MTL5531 1ch vibration probe interface

MTL5532 1ch pulse isolator, digital or analogue output

MTL55332ch vibration probe interface

Fire and Smoke 　

MTL5561 2ch loop-powered, for fire and smoke detectors   

General 　

MPA5500 85 - 265V ac power adaptor

MTL5599Dummy isolator 

MTL599124V dc power supply