MTL5546/Y for 4–20mA HART® valve positioners with line fault detection
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MTL5546/Y for 4–20mA HART® valve positioners with line fault detection
MTL5546/Y for 4–20mA HART® valve positioners with line fault detection
MTL5546 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 or short circuits in the field wiring: if these occur, the current taken into the terminals drops to a preset level. The MTL4546C and the MTL5546Y are very similar to the MTL5546 except that they provide open circuit detection only
(i.e. no short-circuit detection).
MTL5546/Y 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)
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
Transfer accuracy at 20°c
Better than 20µA
Temperature drift
< 1.0µA/°C
