Epro MMS3120/022-100 Dual Channel Vibration Transmitter

Overview

The Emerson EPRO MMS3120/022-100 is a dual-channel vibration monitoring module developed for continuous condition monitoring and protection of rotating machinery within the MMS3000 system. It processes vibration and displacement signals from field sensors and converts them into standardized outputs for integration with PLC and DCS platforms.

Designed for high-reliability environments, the module supports both absolute and relative vibration measurement depending on the connected sensor type. It is widely used in critical equipment such as turbines, compressors, pumps, and gear-driven systems.

Functional Description

The MMS3120/022-100 performs real-time signal acquisition, conditioning, and evaluation across two independent measurement channels. Each channel can be configured separately or used together for comparative or redundant monitoring.

The module incorporates onboard diagnostics to continuously verify sensor integrity, signal quality, and internal electronics status. Alarm and trip outputs are generated when predefined thresholds are exceeded, enabling direct integration into machinery protection schemes.

Technical Specifications

Measurement Capabilities

• Measurement modes:

• Vibration velocity (mm/s)

• Displacement (µm peak-to-peak)

• Maximum value selection between channels (configurable)

• Measurement ranges:

• Velocity: up to 100 mm/s

• Displacement: up to 500 µm (extended range depends on sensor type)

• Frequency response: 0.5 Hz to 10 kHz

• Measurement accuracy: typically ±1% of full scale

• Resolution: up to 0.01 µm (depending on configuration)

Sensor Compatibility

• Seismic vibration sensors (e.g., PR9268 series)

• Eddy-current proximity probes (e.g., PR6422 / PR6423 series)

• Flexible configuration allows mixed sensor types depending on application requirements

Electrical Characteristics

• Supply voltage:

• 24 V DC (18–31.2 V DC operating range)

• Dual redundant inputs supported for high-availability systems

• Analog outputs:

• Two independent 0/4–20 mA outputs

• Optional 0–10 V signal output

• Digital / relay outputs:

• Up to 5 configurable outputs (Alert, Danger, OK, Trip)

• Communication interfaces:

• RS-485 (Modbus RTU)

• Optional fieldbus modules (e.g., Profibus DP or Ethernet variants)

Environmental Specifications

• Operating temperature: –20 °C to +70 °C

• Housing protection: IP65 (industrial enclosure version)

• Designed for continuous operation in high-vibration industrial environments

• Suitable for installation in harsh process areas

Mechanical Characteristics

• Dimensions: 127.5 × 125.8 × 80 mm

• Alternative housing formats available depending on system configuration

• Weight:

• 1.2 kg

• Lower weight variants available for board-level integration

• Mounting options:

• DIN rail installation

• Panel mounting

• MMS3000 rack integration

Key Features

• Dual-channel independent monitoring architecture

• Integrated microprocessor for advanced signal processing

• Continuous self-diagnostics for sensor and module status

• API 670-aligned machinery protection functionality

• Redundant power input support for critical systems

• Flexible communication and integration with SCADA/PLC systems

Application Areas

• Steam and gas turbine vibration monitoring

• Compressor radial and axial vibration analysis

• Pump and fan condition monitoring

• Gearbox vibration and bearing condition tracking

• Power generation and petrochemical plant machinery protection

FAQ

Q: Can the module handle different sensor types simultaneously?
A: Yes, depending on configuration, it supports both seismic and eddy-current sensors.

Q: Does it support redundant power supply?
A: Yes, dual 24 V DC inputs are supported for high-reliability systems.

Q: What communication protocols are available?
A: Standard RS-485 Modbus RTU is included, with optional fieldbus support.

Q: Is it suitable for safety-critical applications?
A: Yes, it is designed in line with API 670 requirements for machinery protection.