EMERSON A3120 022-000 CSI3120
EMERSON A3120 022-000 CSI3120
EMERSON A3120 022-000 CSI3120
EMERSON A3120 022-000 CSI3120
EMERSON A3120 022-000 CSI3120

EMERSON CSI 3120 A3120 022-000 | Machinery Health Transmitter

  • Brand:​ Emerson
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    Model:​ CSI 3120 (Part Number: A3120 022-000)
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    Product Type:​ Machinery Health Transmitter (4-20mA)
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    Series:​ CSI (Now part of Emerson’s AMS Suite)
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    Core Function:​ Continuously monitors overall vibration and temperature of critical assets (pumps, fans, compressors) and transmits a 4-20mA signal proportional to machine health to a control system (DCS/PLC).
  • •
    Key Specs:​ 4-20mA vibration & temperature output, loop-powered, rugged industrial design.
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Part number: EMERSON CSI 3120 A3120 022-000
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Description

CSI 3120: Product Overview
The EMERSON CSI 3120, with the specific part number A3120 022-000, is a compact, loop-powered machinery health transmitter designed for continuous monitoring of critical industrial equipment. It functions as an early warning system by measuring the overall vibration (typically in velocity, like mm/s or in/s) and bearing temperature of machines, converting these measurements into industry-standard 4-20mA signals. These signals are transmitted directly to a PLC (Programmable Logic Controller) or DCS (Distributed Control System), allowing for real-time monitoring and the generation of alarms to prevent unexpected machine failure.
Installed directly on asset mounts (like pump bearing housings or motor frames), its primary role is to provide a simple, reliable, and cost-effective means of integrating predictive maintenance data into the plant’s control and safety system. It is designed for 24/7 operation in harsh industrial environments, providing a crucial layer of protection for equipment that is essential to production, thereby reducing downtime and maintenance costs.

EMERSON A3120 022-000 CSI3120

EMERSON A3120 022-000 CSI3120

CSI 3120: Technical Specifications
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    Model Number:​ CSI 3120
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    Manufacturer Part Number:​ A3120 022-000
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    Manufacturer:​ Emerson (formerly CSI – Computational Systems, Inc.)
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    Product Type:​ 4-20mA Vibration and Temperature Transmitter
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    Sensors:​ Integrated MEMS accelerometer for vibration, RTD for temperature.
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    Vibration Measurement:​ Overall Velocity (selectable ranges, e.g., 0-25 mm/s RMS)
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    Temperature Measurement:​ Bearing Temperature (via integrated RTD)
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    Outputs:​ Two independent 4-20mA signals (one for vibration, one for temperature).
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    Power Supply:​ Loop-powered (12-30 VDC) via the 4-20mA loop.
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    Loop Load:​ 250 Ohms maximum (for 12V supply).
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    Frequency Response:​ Typically 4.5 Hz to 1 kHz (suitable for general machine monitoring).
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    Enclosure:​ Weatherproof, epoxy-coated aluminum.
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    Operating Temperature:​ -40°C to +85°C (-40°F to +185°F).
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    Connections:​ Conduit entry with flying leads or terminal block.
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    Certifications:​ ATEX, IECEx, CSA, UL (for hazardous areas).

    EMERSON A3120 022-000 CSI3120

    EMERSON A3120 022-000 CSI3120

Core Features & Customer Value
The transmitter’s primary value is its simplicity and integration capability. It translates complex vibration data into a simple 4-20mA signal that any plant control system can understand. This allows maintenance and operations teams to set alarms directly in the DCS/PLC to alert personnel of deteriorating machine condition before a catastrophic failure occurs, enabling planned maintenance.
Its robust, loop-powered design​ makes it extremely easy to install and requires no external power supply at the device, reducing wiring complexity and cost. The dual-output functionality (vibration and temperature) provides two critical machine health indicators from a single device. For plant engineers, this is a cost-effective solution for monitoring a large number of critical assets, forming the foundation of a predictive maintenance program and helping to avoid costly unplanned downtime.
Typical Applications
In a water treatment plant, CSI 3120 transmitters are mounted on critical cooling tower fans and water circulation pumps. The 4-20mA signals are wired to the plant’s PLC, which is programmed to trigger a high alarm in the control room if vibration levels exceed a pre-set threshold, allowing operators to schedule maintenance before a pump seal fails.
In a chemical processing facility, they monitor large centrifugal compressors. The temperature signal provides early warning of bearing overheating, while the vibration signal indicates imbalance or misalignment, enabling maintenance to be planned during a scheduled turnaround.

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