Description

ABB AX400 Process Analyzer

Technical Specifications

• Product Model: AX400
• Brand: ABB
• Warranty: One Year
• Input Voltage: 85‑265 VAC; optional 24 VAC / 12‑30 VDCeero
• Operating Temperature: -20 °C to +65 °Ceero
• Storage Temperature: -25 °C to +75 °Ceero
• Response Time: < 2 seconds (filter‑dependent)
• Protection Class: IP66 / NEMA 4X (front face)eero
• Accuracy Class: ±1 % of measured reading for conductivity inputsManualsLib
• Output Frequency: Not applicable (process analytical transmitter)
• Rated Current Range: 0‑22 mA isolated analog output (configurable 4‑20 mA standard)
• Communication Interface: Isolated analog outputs; optional PROFIBUS‑DP moduleManualsLib
• Supported Protocols: PROFIBUS‑DP (option); 4‑20 mA analog signal
• Overload Capacity: Internal surge protection; 2 kV RMS mains‑to‑earth isolationeero
• Dimensions: 96 mm × 96 mm × 162 mm (panel‑mount variant)eero

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Product Overview

The ABB AX400 is a modular multi‑input process analytical transmitter built for continuous liquid‑phase measurement within industrial water‑treatment and chemical‑processing workflowsManualsLib. This device supports interchangeable measurement cards for conductivity, pH, ORP, and dissolved oxygen, enabling site‑specific configuration without full unit replacement. It delivers compensated real‑time measurements via Pt100 / Pt1000 temperature sensing and configurable media‑specific temperature correction curves, reducing measurement drift caused by fluctuating process fluid temperatures.

It resolves common field challenges including multi‑parameter monitoring needs, frequent sensor calibration, and integration into existing DCS‑PLC control architectures. Two standard galvanically isolated current outputs transmit measured or calculated variables to host control systems; relay outputs support automated sensor‑cleaning routines for high‑maintenance sampling pointseero. Process plant operators, system integrators, and maintenance teams handling boiler feedwater, ultrapure water, and chemical batch monitoring benefit most. The unit accepts panel‑mount installation and includes local keypad‑based setup, lowering reliance on external configuration software during commissioning and routine servicing.

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Key Application Notes

• Supports single‑channel or dual‑channel sensor input configurations for matched‑sample monitoring tasksManualsLib
• Calibration routines include stability checking to avoid offset errors from unstable sensor readings
• Fault‑state current forcing (0‑22 mA range) provides clear diagnostic signalling for host automation systems
• Compatible with standard ABB sensor families for conductivity, pH, redox and dissolved‑oxygen measurement

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