ABB SADT20MP33H ME Signal Isolator/Converter

The ABB SADT20MP33H ME is a high-performance signal isolator and converter designed for use in industrial process control, power generation, and automation systems. It belongs to ABB's range of signal conditioning modules that provide galvanic isolation, signal conversion, and filtering for analog signals, ensuring accurate and reliable data transmission between field devices and control systems.

Function and Principle

The SADT20MP33H ME accepts standard analog input signals such as 4-20 mA, 0-20 mA, or 0-10 V DC, and provides an isolated output signal proportional to the input. The isolation barrier (typically 1.5 kV AC/DC) eliminates ground loops, common-mode voltages, and electrical noise, protecting sensitive control equipment. The module may also perform signal conversion (e.g., current to voltage) and linearization, as well as filtering to suppress high-frequency interference.

Key Features

• Galvanic isolation: 1.5 kV AC/DC between input, output, and power supply.

• Input types: 4-20 mA, 0-20 mA, 0-10 V, ±10 V (configurable via DIP switches or software).

• Output types: 4-20 mA (active/passive), 0-10 V, or customized ranges.

• Accuracy: < ±0.1% of span.

• Response time: < 50 ms (adjustable filtering).

• Power supply: 24V DC (10-35V DC) with reverse polarity protection.

• Mounting: DIN rail (TS35) or panel mount.

Technical Specifications

• Input impedance: Current input: 50 Ω; Voltage input: >100 kΩ.

• Load capability: Output current: max. 600 Ω (at 24V).

• Isolation test voltage: 1.5 kV AC, 50 Hz, 1 min.

• Operating temperature: -20°C to +60°C.

• Storage temperature: -40°C to +85°C.

• Humidity: 0-95% RH non-condensing.

• Dimensions (HxWxD): 75 x 22.5 x 115 mm (typical).

Configuration and Diagnostics

The module features DIP switches for range selection and zero/span adjustment. Some variants also support PC configuration via USB. LED indicators for power and output status provide quick diagnostics. The SADT20MP33H ME also includes output signal monitoring and fault detection (e.g., sensor break detection).

Applications

• Isolating 4-20 mA signals from field transmitters to PLC/DCS analog input cards.

• Converting voltage signals to current loops for long-distance transmission.

• Splitting analog signals to multiple receivers (with optional multi-output models).

• Protecting control equipment from ground loops and surges in power plants and substations.

• Signal conditioning in HVAC, water treatment, and chemical processes.

Compliance and Approvals

• EMC: IEC 61000-6-2, IEC 61000-6-4.

• Safety: IEC 61010-1, UL 61010-1 (cULus pending).

• Hazardous locations: ATEX/IECEx for installation in safe area (intrinsic safety barriers not included).

The ABB SADT20MP33H ME signal isolator/converter is a reliable and precise solution for maintaining signal integrity in demanding industrial environments, ensuring accurate process data and protecting valuable control equipment.