Epro MMA3311/022-100 Shaft Vibration Monitor Module

Product Overview

The MMA3311/022-100 is a compact shaft vibration monitoring unit from Epro (Emerson MMA3000 series), developed for machinery protection in low-channel applications. It is designed to measure relative shaft vibration using eddy current proximity probe technology and convert the signal into standardized outputs for control and protection systems.

This module is typically deployed on turbines, compressors, pumps, and fan systems where continuous shaft condition monitoring is required within a compact architecture.

Measurement Principle

The device evaluates shaft vibration based on non-contact eddy current displacement measurement. The raw probe signal is conditioned internally, filtered, and converted into proportional electrical outputs for further processing in PLC or DCS systems.

Its configuration allows adaptation to different machine dynamics through adjustable filtering and alarm parameters.

Technical Specifications

Model: MMA3311/022-100
Manufacturer: Epro (Emerson MMA3000 Series)
Product Type: Shaft Vibration Monitoring Module

Sensor Input Type:

• Eddy current displacement probes

• Compatible series: PR6422, PR6423, PR6424, PR6425, PR6426

Measurement Type: Relative shaft vibration

Frequency Response:

• High-pass filter: 5 Hz / 10 Hz / 15 Hz selectable

• Low-pass filter: 50 Hz to 1500 Hz

Output Signals:

• 4–20 mA analog current loop

• Configurable alarm relays

• Additional programmable function outputs

Configuration Method: Software-based parameter setup for scaling, alarms, and output logic

Electrical Interface: Harting industrial connector system

Mechanical Characteristics:

• Compact housing for space-limited installations

• Shock resistance up to 20 g

Power Supply: 24 V DC

Mounting Style: Cabinet or machine-mounted installation

Environmental Design: Industrial-grade construction for vibration, heat, and EMI resistance

Standards Compliance: Designed for API 670 aligned machinery protection systems

System Features

• Dedicated relative shaft vibration measurement for rotating equipment

• Flexible software configuration for multiple machine types

• Stable analog and alarm outputs for protection system integration

• Compact design optimized for low-channel monitoring setups

• High mechanical durability for harsh industrial environments

• Compatible with standard eddy current probe infrastructure

Application Areas

• Small gas and steam turbines

• Centrifugal and process compressors

• Industrial pump systems

• Fans and auxiliary rotating equipment

• Compact machinery protection and condition monitoring systems

FAQ

What type of vibration does this module measure?
It measures relative shaft vibration using eddy current displacement probes.

Which sensors are supported?
It supports PR6422 to PR6426 eddy current probe series.

Can system parameters be changed after installation?
Yes, all measurement ranges, filters, and alarms are software configurable.

Is this suitable for large monitoring systems?
No, it is designed for compact or low-channel machinery applications.

Does it support alarm output functions?
Yes, it provides configurable relay and alarm outputs in addition to 4–20 mA signal.