MTL4649 temperature convert

MTL4649 temperature convert

The MTL4649 accepts 4/20mA floating signals from a controller to drive 2 current/pressure converters (or any other load up to 800Ω). 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 MTL4649Y is very similar except that it provides open circuit detection only

Number of channels:Two

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

Response time:Settles within 200µA of final value within 100ms

LED indicator:Green: power indication

Maximum current consumption (with 20mA signals into 250Ω load):70mA at 24V dc

Power dissipation within unit (with 20mA signals into 250Ω load):1.6W at 24V

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