Product Introduction
The Epro MMS3311 Speed / Key Pulse Transmitter is a specialized monitoring device used for rotational speed measurement and phase reference detection in rotating machinery. It is designed to work with proximity probes or pulse sensors to determine shaft speed and generate a key-phasor signal for advanced vibration analysis.
As part of the MMS3000 transmitter series, the device provides robust signal processing and reliable output signals for integration into plant monitoring systems. It enables engineers to monitor rotor speed, detect abnormal operating conditions, and perform detailed rotor dynamic analysis.
The MMS3311 is commonly installed in turbine monitoring cabinets, compressor protection systems, and generator monitoring platforms where accurate speed measurement and shaft reference signals are essential for machinery protection.
Technical Specifications
| Parameter | Specification |
|---|
| Manufacturer | Epro |
| Model | MMS3311 |
| Module Type | Speed / Key Pulse Transmitter |
| Measurement Type | Rotational speed and key-phasor signal |
| Sensor Compatibility | Proximity probes / pulse sensors |
| Output Signals | 0/4–20 mA analog speed output |
| Additional Output | Key-pulse reference signal |
| Power Supply | 24 V DC |
| Installation | Machine-mounted transmitter |
| Industrial Applications | Turbines, compressors, generators |
| Operating Environment | Industrial machinery monitoring systems |
| Dimensions | 127.5 × 125.75 × 80 mm |
| Weight | 1.465 kg (3.23 lb) |
Typical Industrial Application Scenarios
The Epro MMS3311 Speed / Key Pulse Transmitter is designed for precise rotational speed monitoring and key-phasor signal detection in turbomachinery and other rotating equipment. As part of the MMS3000 transmitter family, it converts sensor signals into standardized outputs suitable for PLC, DCS, or machine protection systems.
This transmitter processes signals from proximity probes or pulse sensors to determine rotational speed and shaft reference position. The key-pulse function provides a once-per-revolution reference signal used for vibration phase analysis and rotor dynamic diagnostics.
Typical industrial usage includes:
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Steam and gas turbine speed monitoring systems
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Compressor rotor speed and phase reference measurement
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Generator shaft speed supervision
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Turbomachinery overspeed protection systems
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Rotor dynamic analysis and phase measurement systems
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Industrial predictive maintenance platforms
Installed close to the monitored equipment, the transmitter helps ensure accurate speed measurement and stable signal processing within machine monitoring architectures.
Engineering Advantages
Accurate Rotational Speed Measurement
The transmitter converts pulse signals from proximity probes into precise rotational speed measurements used in machinery monitoring and protection systems.
Key-Pulse Reference Generation
It provides a key-phasor signal that marks one revolution of the shaft, enabling phase analysis in vibration monitoring systems.
Dual Independent Signal Processing
The transmitter can process pulse signals and provide speed outputs while simultaneously delivering reference signals for rotor analysis.
Standard Industrial Output Signals
Outputs include 0/4–20 mA analog signals proportional to measured rotational speed, allowing easy integration with automation systems.
Reliable Operation in Turbomachinery Environments
Designed for continuous operation in power plants, petrochemical facilities, and other heavy industrial installations where precise speed monitoring is critical.
Technical FAQs
1. What parameter does the MMS3311 primarily measure?
It measures rotational speed and key-pulse signals from rotating shafts.
2. What type of sensors are compatible with this transmitter?
The device works with eddy current proximity probes and pulse-type speed sensors.
3. What is the function of the key-pulse signal?
The key-pulse provides a once-per-revolution reference used for phase measurement and rotor dynamic analysis.
4. How is the speed signal transmitted to control systems?
Speed values are converted into 0/4–20 mA analog output signals.
5. Can the transmitter be integrated with vibration monitoring systems?
Yes, the key-pulse signal is commonly used together with vibration monitoring modules for phase-related diagnostics.
6. What types of machines typically require key-phasor signals?
High-speed rotating machines such as turbines, compressors, and generators.
7. Does the transmitter support continuous monitoring?
Yes, it is designed for continuous operation in machinery protection systems.
8. What is the benefit of installing the transmitter near the machine?
Local installation reduces signal interference and improves measurement accuracy.
9. Can the module detect speed fluctuations or irregular pulses?
Yes, internal signal processing allows detection of speed changes and irregular pulse intervals.
10. Is the transmitter suitable for predictive maintenance systems?
Yes, speed and phase reference data are critical inputs for condition monitoring and predictive maintenance platforms.
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