Emerson CSI3120 (A3120/022-000) compact vibration transmitter, converts eddy current probe signals into 4–20mA output, used for shaft vibration continuous monitoring on rotating machinery including turbines and compressors.

Product Overview

• Part No: A3120/022-000, CSI3120
• Brand: EMERSON / EPRO

• Category: Compact Vibration Transmitter CSI3120 (A3120/022-000) is a two-wire loop-powered vibration transmitter developed by EPRO. It works with eddy current proximity probes to measure shaft relative vibration. The module processes raw gap signals and outputs standard 4–20mA analog signal proportional to vibration amplitude, which can be directly connected to DCS, PLC or local display instruments without dedicated monitor rack. Built-in configurable alarm threshold enables relay output for on-site alarming. Compact DIN rail mounting design saves cabinet installation space, ideal for skid-mounted equipment and retrofit projects. Widely used as maintenance spare for rotating machinery protection systems in power, petrochemical and oil & gas industries.

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Core Features

• Two-wire 4–20mA loop-powered design, simple field wiring
• Matches EPRO eddy current proximity probe for shaft vibration measurement
• Configurable vibration measurement range and alarm setpoint
• Integrated relay alarm output for local interlock or indication
• Onboard signal filtering to suppress high-frequency interference
• Compact DIN rail mounting structure, easy installation and commissioning
• Comprehensive self-diagnosis for probe breakage and signal faults
• Wide operating temperature range, suitable for industrial control room environment

• Compliant with general industrial EMC standards for continuous long-term operation

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Technical Specifications

• Model Code: A3120/022-000, CSI3120
• Power Supply: 24 VDC two-wire loop power
• Output Signal: 4–20mA proportional to vibration amplitude
• Supported Sensor: EPRO series eddy current proximity probe
• Measurement Type: Shaft relative vibration
• Alarm: Configurable threshold with relay contact output
• Mounting: Standard DIN rail
• Operating Temperature: -20°C ~ +60°C
• Storage Temperature: -40°C ~ +85°C

• Protection Class: IP20

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Compatibility & Application

• Compatible with PR6422, PR6423, PR6424 series eddy current probes
• Widely deployed in thermal power plants, oil & gas, petrochemical facilities
• Applied for continuous vibration monitoring of compressors, pumps, small steam turbines and generator sets