MTL5546Y MTL Isolating Driver for 4–20mA HART valve positioners with line fault detection
The MTL5546Y-T accepts a 4/20mA floating signal from a safe-area
controller to drive a current/pressure converter (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 circuit in
the field wiring: if this occurs, the current taken into the terminals drops
to a preset level.
SPECIFICATION
See also common specification
Number of channels One
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)
Output resistance
> 1MΩ
Under/over range capability
Under range = 1mA
Over range = 24mA (load ≤ 520Ω)
Input and output circuit ripple
< 40µA peak-to-peak
Transfer accuracy at 20°C
Better than 20µA
Temperature drift
< 1.0µA/°C
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