Quick Procurement Summary
We manufacture magnetoresistive speed sensors — also called rotational speed sensors — for steam turbine speed measurement in power plants and steel mills. Each speed sensor model listed on this page is a unique product number that we design, build and test in our own factory.
If you need a quotation, send us your model number or drawing, quantity, and target delivery date. In return, we provide technical datasheets, test reports and a confirmed production schedule for your speed sensor order.
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What Is This Speed Sensor Used For?
This page covers one specific product family: the magnetoresistive rotational speed sensor used to measure steam turbine shaft speed. It is not a general-purpose speed sensor catalog, and it does not cover other sensing technologies unless a specific model on this page uses that technology.
A rotational speed sensor of this type works by detecting the teeth of a trigger wheel (or gear) mounted on the turbine shaft. As the shaft rotates, the magnetoresistive element generates a pulse output signal that is proportional to rotational speed. This signal is sent to the turbine's speed governor, overspeed protection system, or condition-monitoring system.
Because steam turbines operate continuously under high temperature, vibration and, in many installations, oil mist or steam contamination, the speed sensor's mechanical design, sealing and materials matter as much as its electrical specification. Every model we manufacture is built and tested for this specific duty.
Technical Specifications
Each speed sensor model is manufactured to its own fixed specification. Select a model based on your turbine's speed measurement point, mounting envelope, output signal requirement and ambient conditions.
| Item |
Description |
| Manufacturer |
Yoyik |
| Sensor Type |
Magnetoresistive rotational speed sensor |
| Measurement Point |
Steam turbine rotor / shaft speed |
| Speed Range |
0~3000RPM |
| Output Signal |
Square wave |
| Supply Voltage |
24 VDC |
| Gear Tooth |
Involute tooth profile |
| Gear module |
2-4 |
| Thread Size |
Thread diameter and length |
| Probe Length |
50~200 mm |
| Cable Length |
Customizable |
| Connector Type |
Embedded cable or Aviation connector |
| Operating Temperature |
-20~120°C |
| Housing Material |
Stainless steel |
How to Select the Correct Model
- Confirm the measurement location — main shaft speed, overspeed trip, or turning-gear/zero-speed point.
- Confirm the mounting dimensions and thread/flange type from your drawing or the existing sensor's nameplate.
- Confirm the required output signal type, number of channels and supply voltage for your governor or monitoring system.
- Confirm ambient conditions — operating temperature, vibration level, and whether the location is exposed to oil, steam or moisture.
All values in the table above are for reference only; actual figures depend on the specific model or specifications in your inquiry.
Applications in Power Plants & Steel Mills
Steam Turbine Speed Monitoring
Our speed sensors are used to monitor the rotational speed of steam turbine rotors in real time, feeding data to the turbine governor and control system in power generation units.
Overspeed Protection
As an overspeed protection sensor, this speed sensor is installed on the turbine's overspeed trip system, where reliability and long-term stable operation under continuous duty are the primary design requirements.
Zero-Speed and Turning Gear Detection
For turning-gear operation and shutdown monitoring, the same sensor family is used as a zero-speed sensor to confirm whether the turbine shaft is stationary or rotating at very low speed.
Power Plant Applications
Typical installations include main steam turbine generator units, boiler feed water pump turbines, and waste heat recovery steam turbines in power plants.
Steel Mill Applications
In steel mills, this rotational speed sensor is used on captive power plant steam turbines, waste heat recovery turbines, and steam turbines that drive compressors or blowers in the production process.
Working Environment
These speed sensors are designed for high-temperature, high-vibration, continuous-duty environments, including locations exposed to lubricating oil and process contamination — conditions typical of turbine houses in both power plants and steel mills.
Supply, Quality Assurance & Lead Time
Factory Direct Manufacturer
We manufacture these speed sensor models ourselves. We are the factory, not a trading company or reseller, and every unique model number on this page is produced under our own quality system.
Production
Production is organized by model number, order quantity, customer drawing and confirmed technical parameters before manufacturing begins.
Quality Control
Each speed sensor batch is tested before shipment, including:
- Output waveform test
- Rotational speed simulation test
- Insulation resistance test
- Dielectric withstand (high-voltage) test
- High/low temperature test
- Vibration test
- Burn-in / aging test
Documentation Provided
- Datasheet
- Dimensional drawing
- Wiring diagram
- Factory test report
- Packing list
Frequently Asked Questions
What is this speed sensor used for? It is used for steam turbine speed measurement — including main shaft speed, overspeed protection, and turning-gear/zero-speed detection — in power plants and steel mills.
Is this a magnetoresistive speed sensor? Yes. Every model on this page is a magnetoresistive rotational speed sensor designed specifically for steam turbine speed measurement.
Which speed sensor models do you manufacture? See the model list in the Technical Specifications and Related Products sections above. Each listed model number is manufactured by us in our own factory.
What output signal can the speed sensor provide? Square wave / pulse output is available, with channel count and supply voltage options that vary by model — refer to the specification table for your selected model.
What is your lead time? Lead time is confirmed by model and order quantity once your inquiry is reviewed.
Request a Quote
Send your speed sensor model number, drawing, or a nameplate photo. Our technical team will confirm production feasibility, technical data, lead time and pricing.
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