MTL5581 (Isolator for low-level signals)

MTL5581 (Isolator for low-level signals)

MTL5581 takes a low-level dc signal from a voltage source in a hazardous area, isolates it, and passes it to a receiving instrument located in the safe area. The module is intended for use with thermocouples utilising external cold-junction compensation. A switch enables or disables the safety drive in the event of thermocouple burnout or cable breakage; a second switch permits the selection of upscale or downscale operation as appropriate.

MTL5581 SPECIFICATION

See also common specification

Number of channels

One

Signal source

Any dc millivolt source

Location of millivolt source

Zone 0, IIC, T4–T6 hazardous area if suitably certified

Div. 1, Group A, hazardous location

Input and output signal range

0 to ± 50mV, overrange to ± 55mV

Maximum lead resistance 600Ω

Output resistance

60Ω nominal

Transfer accuracy@20°c

Linearity and repeatability < 0.05% of reading or ± 5μV,

Whichever is the greater

Temperature drift

< 2μV/°C, maximum

Response time

Settles to within 10% of final value within 150μs

Frequency response

dc to 4kHz nominal

Safety drive on THc burnout

Two switches enable or disable the safety drive and select

Tag: MTL Safety Barrier