MTL5549/Y isolating driver two-channel, for 4–20mA, HART® valve positioners
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MTL5549/Y isolating driver two-channel, for 4–20mA, HART® valve positioners
MTL5549/Y isolating driver two-channel, for 4–20mA, HART® valve positioners with line fault detection
MTL5549 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. MTL4549C and MTL5549Y are very similar to MTL5549 except that they provide open circuit detection only (i.e. no short-circuit detection).
SPECIFICATION
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
