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

　　Input characteristics

　　Response time

　　Settles within 200µA of final value within 100ms

　　Communications supported

　　HART

　　LED indicator

　　Green: power indication

　　Maximum current consumption (with 20mA signals into 250Ω load)

　　35mA at 24V dc

　　Power dissipation within unit (with 20mA signals into 250Ω load)

　　0.8W at 24V

　　Operating temperature range

　　-20°C to + 65°C (-6 to + 149°F)

　　Safety description

　　Uo=28V Io=93mA Po=651mW Um = 253V rms or dc