EPRO MMS3120/022-000 Dual Channel Vibration Monitor (9100-03047-01)

The EPRO MMS3120/022-000 (ordering code 9100-03047-01) is a dual-channel vibration monitor designed for continuous monitoring of rotating machinery in accordance with API 670 standards. It accepts inputs from both eddy current displacement sensors (e.g., PR642x series) and seismic velocity sensors (e.g., PR9268), making it versatile for measuring shaft relative vibration and casing absolute vibration. Each channel independently processes the signal, providing two alarm relays (Alert and Danger) and two scalable 4-20 mA analog outputs for connection to distributed control systems (DCS) or plant historians. The module is part of the MMS3000 series, known for its high reliability and modular design in turbomachinery protection applications.

Key Features

• Dual Independent Channels: Two fully independent measurement channels with separate signal conditioning and relay outputs.

• Versatile Input Compatibility: Accepts both eddy current proximity probes (for shaft vibration) and seismic velocity sensors (for bearing housing vibration).

• Adjustable Alarms: Each channel has two independently adjustable alarm setpoints (Alert and Danger) with programmable hysteresis and time delays.

• Scalable Analog Outputs: Two isolated 4-20 mA outputs per channel (proportional to vibration amplitude) for remote monitoring.

• API 670 Compliant: Designed to meet the requirements of API 670 for machinery protection systems.

• Buffered Sensor Output: Provides raw sensor signal outputs for diagnostics and portable analyzers.

Technical Specifications

• Input Channels: 2

• Sensor Types: Eddy current (PR642x) or seismic velocity (PR9268)

• Measurement Ranges: Configurable for displacement (µm) or velocity (mm/s)

• Frequency Response: 1 Hz to 10 kHz (depending on sensor)

• Alarm Relays: 2 per channel, SPDT, 250 VAC / 5 A

• Analog Outputs: 2 x 4-20 mA per channel, max load 600 Ω

• Power Supply: 24 VDC (18-36 VDC) or 115/230 VAC (depending on backplane)

• Operating Temperature: -20°C to +65°C

• Mounting: MMS3000 rack system or standalone

• Certifications: CE, UL, ATEX (with associated barriers)

Applications

The MMS3120/022-000 is widely used in critical machinery such as steam turbines, gas turbines, centrifugal compressors, pumps, and fans. It continuously monitors vibration levels to detect developing faults like unbalance, misalignment, bearing wear, and looseness, enabling predictive maintenance and preventing catastrophic failures. It is a key component in machinery protection systems (MPS) in power generation, oil & gas, and petrochemical industries.

Integration and Configuration

The module is typically installed in an MMS3000 rack with a dedicated power supply and communication modules. Configuration is performed via front-panel DIP switches and potentiometers or through the optional MMS6850 communication interface. The alarm setpoints, time delays, and output scaling are easily adjustable. The buffered output allows connection to portable vibration analyzers without disturbing the monitoring function.

Reliability and Environmental Compliance

Designed for continuous operation in harsh industrial environments, the MMS3120 meets stringent EMC and environmental standards (IEC 61000-4). Its modular construction allows hot-swapping in redundant configurations. The module is CE marked and complies with RoHS.

With its robust design and versatile input capability, the EPRO MMS3120/022-000 dual channel vibration monitor ensures reliable protection and condition monitoring for high-value rotating assets.