EATON DILM50

The MTLx549 accepts 4/20mA floating signals from safe-area controllers 

to drive 2 current/pressure converters (or any other load up to 800Ω) in 

a hazardous area. For HART valve positioners, the module also permits 

bi-directional transmission of digital communication signals. Process 

controllers with a readback facility can detect open or short circuits 

in the field wiring: if these occur, the current taken into the terminals 

drops to a preset level. The MTL4549C and MTLx549Y are very similar 

to the MTLx549 except that they provide open circuit detection only 

(i.e. no short-circuit detection).

Description:

See also common specification

Number of channels

Two

Location of I/P converter

Zone 0, IIC, T4–6 hazardous area if suitably certified

Div. 1, Group A, hazardous location

Working range

4 to 20mA

Digital signal bandwidth

500Hz to 10kHz

Maximum load resistance

800Ω (16V at 20mA)

Minimum load resistance

90Ω (short-circuit detection at < 50Ω)

Output resistance

> 1MΩ

Under/over range capability

Under range = 1mA

Over range = 24mA (load ≤ 520Ω)

Input and output circuit ripple

<40µA peak-to-peak

Communications supported

HART

Transfer accuracy at 20°C

Better than 20µA

Temperature drift

< 1.0µA/°C

Input characteristics

Field wiring state MTL4549 MTL4549C MTL4549Y

Normal < 6.0V < 6.0V < 6.0V

Open-circuit < 0.9mA < 0.9mA < 0.5mA

Short-circuit < 0.9mA N.A. N.A.

Response time

Settles within 200µA of final value within 100ms

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