Why is near-zero speed detection starting from 0 Hz required for hydroelectric speed monitoring?

It is critical to securely capture turbine or runner operations through the entire spectrum from initial startup break-away to complete stoppage. Since COCORESEARCH gear speed sensors track from 0 Hz, they verify rotation at startup and deliver precise tracking data during unexpected emergency shutdowns, ensuring robust safety loops.

What are the core requirements for speed monitoring when integrating with hydro governors?

The paramount factor is the responsive calculation speed to dynamic shift inputs. Converters equipped with our proprietary 'Periomatic' technology provide ultra-fast tracking to transient speed changes and feed real-time analog outputs required by the governor. This enables prompt control valve operation and significantly minimizes equipment damage risk.

Can these components handle highly humid environments or water splash risks standard in hydro installations?

Yes. Our gear speed sensors feature a fully enclosed, single-piece unified metal case that complies with IP67 ingress protection standards. Additionally, our proprietary 'Conical Press' molding technology keeps moisture out at the cable routing exit, delivering stable, long-term operation in demanding fluid-exposed environments.

Is it possible to detect turbine overspeed thresholds and trigger an alert output?

Yes. Instruments within the SPD series offer optional configuration for alert/alarm discrete outputs. The device immediately triggers an alarm relay signal when the turbine exceeds preset rotation speed limits, which can be linked to emergency trip loops and safety interlocks.

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Rotational Speed Measurement in Hydroelectric Power & Flow Control via Governors

In hydroelectric power generation, if power transmission is abruptly cut off, the water turbine or generator may experience uncontrolled overspeed spinning, potentially damaging the rotating components or mechanical seals.
To prevent this, it is essential to perform rapid valve closure or similar control operations in the waterway immediately after power disconnection.

Overview

A gear speed sensor detects the rotation of components like water turbines and outputs a frequency pulse signal corresponding to the rotational speed.
This signal is transmitted to the governor through a signal converter to control the opening and closing of the waterway valves.

Measurement Benefits

Gear Speed Sensors

■ Capable of detecting speeds from 0 Hz, allowing precise tracking and logging of turbine motion right from startup through complete standstill.

■ The sensor's detection face features a fully sealed, unified metal housing for exceptionally high structural reliability.

■ The cable outlet incorporates our proprietary Conical Press™ technology, making it well-suited for harsh environments exposed to water or oil splashing.

Signal Converters

■ Powered by our proprietary Periomatic™ calculation method, delivering outstanding accuracy from ultra-low to high speeds. It ensures ultra-fast response times to sudden turbine speed fluctuations.

> Learn more about Periomatic™

■ Analog output ranges can be selected from 0–10 V, 0(1)–5 V, 4–20 mA, etc. (configurable via internal software program or specified at the time of order).
The full-scale value can also be finely tuned to match your governor's input requirements.

■ Alarm output is available as an option on the SPD series. It triggers an alert signal immediately if the turbine exceeds the designated RPM limits.

Selection Key Points

Gear Speed Sensors

■ 0 Hz near-zero speed detection capability

■ IP67 protection: Fully enclosed single-piece metal casing combined with our unique Conical Press™ cable outlet technology

Signal Converters

■ Powered by our proprietary Periomatic™ algorithmic calculation

■ High-speed analog output refreshing rate

Product Lineup

View All Products >

Rotational Speed Measurement

View List >

Magnetic Gear Speed Sensor
FDP Series

■ Fully threaded housing offers versatile mounting options
■ Single Hall-element differential system: Eliminates the need for orientation/rotation tuning during installation
■ Sensor tip face: IP67 rated with a fully hermetic, unified metal structural shell
■ Cable routing: Unique Conical Press design reliably tolerates moisture, water, and oil-mist exposure
■ Measurable frequency: 0 Hz to 15 kHz
■ Operating temperature range: -20°C to +70°C

Speedometer / Totalizer [Switchable]
48x96 mm Size
SPD-4801

■ Simultaneous dual output of CAN (1ms update) and Analog (0.1ms update)
■ Front-panel button interface for direct configuration and monitoring (Key lock function included)
■ USB connectivity allows easy data logging and parameter setup

Speedometer / Totalizer [Switchable]
24x48 mm Size
SPD-2401

Economy Model
SPDL-2401

■ Simultaneous CAN (1ms update) and Analog (0.1ms update) output capable
（SPDL version updates at 40ms intervals）
■ USB port interface for local logging and parameter setting
■ Available in both standard panel-mount and space-saving DIN-rail configurations

Programmable
F/V Converter
KAZ-738

■ Configurable analog full-scale ranges, custom parameters, and internal math operations via complimentary LINKSHIP software or external PL-1A programming unit (sold separately)
■ Input frequency band: 0.006 Hz to 500 kHz
■ Analog output selection: Selectable between 0–10V, 0–5V, 1–5V, 4–20mA, or 0–10mA via switch and configuration settings
16-bit high resolution with a fast 1ms output update time
■ Full isolation: Galvanically isolated across Input — Output — Power Supply channels

Other Related Products Panel Meters / Signal Converters / Indicators

Product Lineup >

EX Series Series Overview >

- CAN Bus Output
- 16-bit Analog (Voltage / Current) Output
- USB-C: For easy configuration and data logging
- Alarm Signal Output / RS-485 Communication
- Free LINKSHIP Software: Supports report printing and data logging
- Dual Analog Outputs [EX48 model]
- Ethernet (LAN) Connectivity [EX48 model]

Load Cell / Strain CAN Converters DC Current DC Voltage Thermocouple Thermistor RTD Sensor Resistance Speed / Total Torque Meter

EX48 Series

EX(L)24 Series

Full Customization Services [Please Consult Us]

Custom Solution Lineup >

■ Flexible measurement pairing & channel layout ■ Cost-efficient and user-friendly structural design ■ Parameter adjustments (custom power input, scaling voltages, specialized communication specs)
■ Available from single-unit runs ■ Calibration tailored to assembly units ■ Inspection certifications and traceability charts can be provided