EPRO MMS6125 Vibration Monitoring Transmitter Module

Overview

The EPRO MMS6125 is a single-channel vibration and displacement transmitter engineered for continuous condition monitoring and protection of high-value rotating equipment. As a member of the MMS6000 monitoring platform, this module performs non-contact measurement of shaft vibration, relative displacement, and axial position using eddy current sensing technology.

Designed for direct installation near the machine, the MMS6125 integrates signal conditioning, diagnostics, and supervision electronics into a compact industrial housing. Its architecture supports redundant 24 V DC power inputs and fulfills the functional and environmental requirements of API 670, making it suitable for safety-critical turbomachinery applications.

Measurement Principle and System Integration

The MMS6125 operates with EPRO PR642x series eddy current probes in combination with CON04x signal converters, forming a complete measurement chain. The module converts raw sensor signals into standardized current outputs for connection to control systems, protection relays, or condition monitoring platforms.

An onboard microcontroller continuously supervises sensor integrity, internal electronics, and power supply status, ensuring early fault detection and high system availability.

Key Technical Characteristics

The MMS6125 is optimized for dynamic vibration monitoring with wide frequency bandwidth and stable signal output under harsh operating conditions.

Core Capabilities

• Single-channel vibration or displacement measurement

• Non-contact eddy current sensing technology

• Dynamic response suitable for high-speed turbomachinery

• Integrated signal conditioning and linearization

Electrical and Signal Performance

• Sensor compatibility: PR6422, PR6423, PR6424, PR6425, PR6426

• Output signal: Configurable 0–20 mA or 4–20 mA

• Frequency response: DC to approximately 20 kHz

• Output load capability: Typical industrial control system ranges

Power and Supervision

• Dual redundant power inputs: 24 V DC nominal

• Integrated sensor and electronics self-diagnostics

• Fault and status signaling via configurable outputs

Mechanical and Environmental Specifications

• Mounting location: Direct machine or local structure installation

• Housing: Rugged industrial enclosure for high-vibration environments

• Dimensions: 127 × 126 × 80 mm

• Weight: 1.3 kg

• Operating temperature range: –30 °C to +85 °C

Standards and Compliance

• Designed in accordance with API 670 requirements

• Suitable for machine protection and condition monitoring systems

• Compatible with safety-oriented turbomachinery architectures

Typical Applications

The MMS6125 is widely used in critical rotating machinery where precise shaft motion monitoring is required, including:

• Steam and gas turbines

• Centrifugal and axial compressors

• Large pumps

• Motors and generators

• Gearboxes and turbo-expanders

Its compact form factor allows installation close to the measurement point, minimizing signal interference and improving data accuracy.

Frequently Asked Questions

Q: Is the MMS6125 suitable for machine protection systems?
A: Yes. The MMS6125 is designed to meet API 670 guidelines and is commonly used as part of machinery protection and shutdown systems.

Q: Which sensors can be used with this module?
A: It supports EPRO PR6422 through PR6426 eddy current probes when used with compatible CON04x converters.

Q: Can the module operate with a single power supply?
A: Yes. While it supports redundant 24 V DC inputs for higher availability, it can operate with a single supply.

Q: Is field mounting allowed?
A: The industrial-grade enclosure and extended temperature rating make the MMS6125 suitable for direct machine mounting in harsh environments.