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- Epro
- MMS3311
- Speed/Key Pulse Transmitter
- Germany
- 127.5 x 125.75 x 80 mm
- 1.465 kg
- Xiamen, China
- New & In Stock
- T/T, PayPal, Western Union
- 1 Year
- 1-3 Working Days
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We have a 10-year logistics and express cooperation agreement, so our products can be shipped to any place in the world.
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Our products are imported in bulk from the place of origin. Because of the cooperative relationship, our products are all original and 100% new.
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We provide 7*24 hours service to our customers. We will be there whenever you need us.
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All our products are priced very favorably because we have our own warehouse and supply.
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Product Overview
In industrial rotating machinery systems, accurate speed measurement and phase reference detection are critical for ensuring safe operation and effective condition monitoring. The Epro MMS3311 Speed / Key Pulse Transmitter is designed to provide precise speed measurement and key pulse signal processing for turbomachinery applications.
This transmitter enables reliable detection of rotational speed and shaft position by processing input signals from proximity probes or magnetic sensors. It plays a vital role in vibration analysis, phase reference tracking, and machinery protection systems.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Epro |
| Model | MMS3311 |
| Product Type | Speed / Key Pulse Transmitter |
| Measurement Type | Rotational speed / phase reference |
| Input Signal | Proximity probes / magnetic sensors |
| Output Signal | 4–20 mA / pulse / voltage output |
| Frequency Range | 0 – 20,000 Hz |
| Speed Range | Configurable |
| Accuracy | High precision industrial grade |
| Dimensions | 127.5 × 125.75 × 80 mm |
| Weight | 1.465 kg |
| Power Supply | 24 VDC |
| Mounting | DIN rail / panel mounting |
| Application | Speed and phase monitoring |
| Environment | Industrial-grade |
| Reliability | Designed for continuous operation |
Function and Working Principle
The MMS3311 operates by receiving signals from proximity probes or magnetic pickup sensors installed near rotating shafts or gear teeth.
This enables:
Accurate measurement of rotational speed
Detection of key pulse (once-per-revolution signal)
Phase reference tracking for vibration analysis
Real-time signal processing and output conversion
The transmitter processes incoming pulse signals and converts them into standardized outputs for monitoring and control systems.
Role in Industrial Control Systems
The MMS3311 plays a critical role in machinery protection and monitoring systems, supporting:
Turbine speed monitoring
Key phase reference for vibration analysis
Overspeed protection systems
Synchronization and control systems
It ensures accurate speed tracking and reliable phase reference signals for advanced diagnostics.
Industrial Applications
The Epro MMS3311 is widely used in:
Steam and gas turbines
Compressors and pumps
Power generation plants
Oil and gas processing facilities
Industrial automation systems
High-speed rotating machinery
It is particularly important in systems requiring precise speed and phase monitoring.
Installation and System Integration
Proper installation ensures optimal performance:
Mounted on DIN rail or control panel
Connected to proximity probes or magnetic sensors
Installed near rotating components for signal detection
Integrated into PLC, DCS, or SCADA systems
Installation must follow wiring and grounding standards
Correct setup ensures accurate signal acquisition and stable operation.
Compatible System Components
The MMS3311 typically works alongside:
Epro PR6423 / PR6424 / PR6426 sensors
Magnetic pickup sensors
MMS3000 series monitoring systems
Control and protection units
Data acquisition and SCADA systems
These components form a complete speed and vibration monitoring solution.
Recommended Alternative Models
| Model | Type | Key Feature | Application |
|---|---|---|---|
| MMS3310 | Speed Transmitter | Standard version | General speed monitoring |
| MMS3315 | Speed Module | Enhanced features | Advanced systems |
| MMS3210 | Vibration Transmitter | Dual-channel monitoring | Combined systems |
| PR6423 + CON021 | Sensor System | Compact solution | Basic monitoring |
| Bentley Nevada 3500 Series | Monitoring System | Industry benchmark | Critical machinery |
Key Advantages
Accurate speed and key pulse detection
Supports phase reference for vibration analysis
Compatible with multiple sensor types
Stable and reliable signal processing
Compact and robust industrial design
Suitable for continuous operation
Technical FAQs
What is the main function of the MMS3311?
It measures rotational speed and provides key pulse signals for phase reference and monitoring systems.
What is a key pulse signal?
It is a once-per-revolution signal used for shaft position and phase reference in vibration analysis.
Where is it typically used?
It is used in turbines, compressors, and other rotating machinery requiring speed and phase monitoring.
Conclusion
The Epro MMS3311 Speed / Key Pulse Transmitter is a reliable and high-performance solution for industrial speed monitoring and phase reference detection. Its precise measurement capability and robust design make it essential for machinery protection and diagnostic systems.
For engineers and maintenance professionals, it provides a dependable way to ensure accurate speed tracking, improve system diagnostics, and maintain safe operation in demanding industrial environments.