Pepperl+Fuchs MTraB-DB200-T Signal Isolator Unit

Module Feature

MTraB-DB200-T is a DIN rail mounted loop isolator from Pepperl+Fuchs. It isolates 4-20mA analog signals with HART transparent transmission, separates field hazardous side and safe control side. It provides intrinsic safety protection, suppresses ground loop noise, supports bidirectional HART communication for smart transmitter calibration. Widely stocked as spare for chemical, oil & gas DCS and SCADA cabinet.

Working principle

The unit receives 4-20mA signal from field transmitter on hazardous zone side. Galvanic isolation blocks ground potential difference interference, signal is reconstructed and forwarded to control system side. HART digital superimposed signal passes through without interruption, allowing remote parameter adjustment of field smart instruments. Internal fault circuit limits energy to meet explosion protection standards.

Onboard components

Isolation transformer, signal conditioning circuit, HART demodulation circuit, surge protection, status LED and plastic DIN rail housing.

LED indicators

Front LEDs indicate power, signal active and fault status.

Hardware self‑diagnosis

Module monitors loop current and internal circuit health. No local adjustment required.

Programming software

Not applicable, transparent HART transmission, configured via HART handheld communicator.

Electrical & Process Parameters

Model: MTraB-DB200-T Brand: Pepperl+Fuchs Device type: HART signal isolator Function: Galvanic isolation and intrinsic safety protection for 4-20mA HART loop

Mechanical & Structure

Mounting: DIN rail mounting Protection class: IP30 Housing: Plastic enclosure

Environmental

Operating temperature: -20℃ ~ +60℃ Storage temperature: -40℃ ~ +85℃ Ambient humidity: 5~95% non‑condensing

Certification: CE, ATEX / IECEx hazardous area approval Status: Original Pepperl+Fuchs intrinsic safety spare

Installation

Cut off 24V DC supply before replacement. Wire hazardous side to field transmitter, safe side to DCS input card, connect 24V auxiliary power, verify 4-20mA signal and HART communication after commissioning.

Interface

Field side 4-20mA terminals, control side 4-20mA terminals, 24V DC power terminals.

Diagnostic

No signal output: Power supply missing or loop open circuit. HART communication fail: Wrong wiring polarity or loop impedance mismatch. Signal drift: Ground loop not fully isolated.

Product Brief

MTraB-DB200-T isolator, Pepperl+Fuchs HART transparent signal isolator spare for hazardous area 4-20mA instrument loop isolation replacement.