MTL MTL4549Y Intelligent isolated driver

Mtl4549 / C/Y-MTL5549 / Y Isolation Driver Dual Channel for 4-20mA, HART® Valve Positioner with line fault detection capability
The MTLx549 accepts a 4/20mA floating signal from the safe zone controller to drive 2 current/pressure converters (or any other load up to 800Ω) in the danger zone. For HART valve positioners, the module also allows two-way transmission of digital communication signals. The process controller with a read-back function can detect an open or short circuit in the field wiring: if these occur, the current will enter the terminal and drop to a preset level. The MTL4549C and MTLx549Y are very similar except that they only provide open circuit detection (i.e. no short circuit detection).

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