Description

Product Overview

The Pepperl+Fuchs MB-16U5L-249121 is a backplane motherboard base carrier, paired with the MB-C3-AI16-KS-131961 16-channel analog input module (part number 280169), designed for Pepperl+Fuchs KS series intrinsic safety isolated I/O system for hazardous chemical, petrochemical and refinery plant applications. This assembly accepts 4–20mA analog signals from field transmitters, provides galvanic isolation and intrinsic safety explosion protection for sensors located in Zone 0/1 hazardous areas, and transmits processed measurement data to the DCS/PLC controller. This hardware eliminates ground loop interference and prevents high voltage transients from entering control room equipment, protecting both field instrumentation and the main automation system. Process control and SIS engineers rely on this spare I/O assembly for plant maintenance and retrofits. It supports hot swap module replacement, and onboard diagnostic circuits detect wire break, short circuit and module fault status.

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Technical Specifications

• Product Model: MB-16U5L-249121 (base carrier) + MB-C3-AI16-KS-131961 (16AI card), PN:280169
• Brand: Pepperl+Fuchs
• Warranty: One Year
• Input Voltage: 24 V DC (18–32 V DC)
• Operating Temperature: -20 °C to 60 °C
• Storage Temperature: -40 °C to 85 °C
• Response Time: Cyclic analog sampling with adjustable digital filtering
• Protection Class: Intrinsically safe; ATEX / IECEx Zone 0/1 approved; IP20 rear terminals
• Accuracy Class: ±0.1% full scale for 4–20mA measurement
• Output Frequency: Not applicable (analog input assembly)
• Rated Current Range: 4–20mA loop supply for field transmitters
• Communication Interface: KS internal backplane bus; 40-pin system connector
• Supported Protocols: Pepperl+Fuchs KS internal bus
• Overload Capacity: 2.5kV galvanic isolation; wire-break detection; short-circuit, ESD and surge protection
• Dimensions: Standard KS rack slot form factor

Application Scenarios

• Chemical Plant SIS & DCS Analog Measurement Rack: This carrier plus AI module reads pressure, flow and temperature transmitter signals from hazardous reactor zones. The MB-C3-AI16-KS-131961 provides intrinsic safety protection to prevent ignition of flammable gas mixtures.
• Refinery Crude Process Instrument Monitoring: Installed in control room racks, it collects 4–20mA signals from field transmitters on distillation columns, isolating hazardous field circuits from the DCS controller.
• Petrochemical Batch Process Control: The 16-channel analog assembly monitors tank level, pressure and temperature measurements. Hot swap design allows module replacement without shutting down the entire KS I/O node.