Description

Product Description

Overview
The MMS6140 is a dual-channel vibration monitoring unit from Epro, part of the Emerson MMS6000 series, engineered for advanced machinery protection and condition monitoring. It integrates two distinct measurement channels: Channel 1 for eddy current sensors to capture relative shaft vibration and Channel 2 for seismic or piezoelectric sensors to monitor absolute bearing vibration. By calculating the differential signal between these channels, the monitor derives absolute shaft vibration, providing critical data for turbine protection and predictive maintenance systems.

Key Features

• Dual independent channels for versatile transducer compatibility

• Differential calculation for absolute shaft vibration measurement

• Phase shift compensation for accurate signal processing

• Configurable outputs for alarm, analysis, and fieldbus integration

• Continuous diagnostics for sensor integrity and signal supervision

Technical Specifications

Model: MMS6140
Manufacturer: Emerson (Epro MMS6000 Series)
Product Type: Dual Channel Vibration Monitor

Measurement Inputs:

• Two independent channels:

• Channel 1: Eddy current sensors for shaft vibration

• Channel 2: Seismic or piezoelectric sensors for bearing vibration

• Differential, galvanically isolated inputs

• Open- and short-circuit proof

Input Signal Characteristics:

Channel 1 (Eddy Current):

• Input impedance: ≥ 100 kΩ

• Voltage range: -1…-23 V

• Signal frequency range: 1/5…50…2000 Hz

• Signal amplitude: 0–400 mVpp minimum, 0–2000 mVpp maximum

• Individual sensor supply: -26.7 V, 20–35 mA

Channel 2 (Seismic/Piezoelectric):

• Input impedance: ≥ 100 kΩ

• Voltage range: -5…+15 V

• Signal frequency range: 5/10…50…1000/1600 Hz (VDI 2056 / DIN 45666 / ISO 3945)

• Signal amplitude: 311–9500 mVpp, configurable

• Sensor supply: 0–8 mA programmable, galvanically isolated

• Accuracy: ±0.5% of full scale or set value

Control & Logic Inputs:

• Binary logic inputs for mode selection (Warning/Danger)

• Channel/module inhibit supported

• Measuring range multiplier adjustable 1.000–4.999

Voltage Inputs & Resolution:

• Voltage: 0–10 V per channel

• Input impedance: >100 kΩ

• Resolution: 10-bit

• Key pulse input: 1 pulse per revolution, 24 V logic, ≥10 µs pulse duration

Output & Signal Processing:

• Configurable analog and logic outputs for alarms or system integration

• In-phase subtraction of bearing vibration from shaft signal for absolute shaft vibration

• So-p / Sp-p measurement modes according to DIN 4566 and ISO 3945

Mechanical & Electrical:

• Operates in open or closed circuit mode

• Parallel module operation without interference

Applications

• Steam, gas, and water turbines

• Compressors, fans, centrifuges, and other turbo machinery

• Turbine protection and condition monitoring systems

• Performance, efficiency, and safety optimization of rotating equipment

FAQ
Q: Can the sensor types be mixed across channels?
A: Yes. Channel 1 is dedicated to eddy current sensors, while Channel 2 supports seismic or piezoelectric sensors.

Q: How is absolute shaft vibration calculated?
A: The system subtracts the in-phase bearing vibration signal from the shaft signal, delivering an accurate absolute shaft vibration measurement.

Q: Can alarm limits be adjusted during turbine start-up?
A: Yes. Measuring range multipliers allow limit modification during run-up or rundown.

Similar Models Comparison

• MMS6120: Single-channel monitoring for simpler systems

• MMS6160: Dual-channel with extended frequency and temperature handling

Specifications

• Brand: EMERSON

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems