Magnetoresistive Speed Sensor CS-1-D-065-06-01: Is It More Cost-Effective Than Eddy Current Type?

The stable operation of a steam turbine depends on the cooperation of various auxiliary equipment. The normal speed of these auxiliary equipment directly affects the overall operating efficiency and safety of the turbine. Speed ​​sensors are key components for monitoring the speed of these equipment. Common steam turbine speed sensors on the market include magnetoresistive and eddy current types. Eddy current speed sensors offer high accuracy and adaptability to extreme operating conditions, but they are expensive and complex to install and maintain. The magnetoresistive speed sensor CS-1-D-065-06-01 offers advantages in cost, installation, and maintenance, and fully meets the performance requirements for speed monitoring of most steam turbine auxiliary equipment. Let’s discuss which auxiliary equipment speed monitoring options are more cost-effective with this magnetoresistive speed sensor than with an eddy current sensor.

1. Lubricating Oil Pump: A Low-Cost Solution for Stable Operating Conditions

The lubricating oil pump is the “lubrication guarantor” of the steam turbine, responsible for delivering lubricating oil to key components such as the rotor and bearings to reduce friction and wear. Its core speed monitoring requirement is stability—as long as the speed remains within the set range and does not experience significant fluctuations or sudden stops, lubrication is guaranteed. There’s no need to pursue extremely high measurement accuracy, nor to contend with extreme temperatures and vibration environments.

The CS-1-D-065-06-01, a magnetoresistive speed sensor, is perfectly suited for lubricating oil pump monitoring. Its measurement range covers common lubricating oil pump speeds, and its output pulse signal is stable enough to determine the pump’s operating status. Furthermore, this magnetoresistive speed sensor is significantly less expensive than an eddy current sensor. Installation requires no strict control of the clearance between the probe and the rotating component, as with eddy current sensors. A skilled technician can complete installation by following the user manual, saving installation costs.

In contrast, while eddy current speed sensors offer higher accuracy, high accuracy becomes a “superfluous feature” for equipment with stable operating conditions like lubricating oil pumps. Eddy current sensors are several times more expensive than magnetoresistive sensors and require regular clearance calibration, resulting in high maintenance costs. Using them on lubricating oil pumps not only increases the equipment purchase budget but also the ongoing maintenance workload, making them a poor choice for cost-effectiveness. Therefore, the CS-1-D-065-06-01 magnetoresistive speed sensor is a more cost-effective choice for lubricating oil pump speed monitoring.

2. Feedwater Pump (Low Pressure): Precise Matching for a Fixed Speed ​​Range

Feedwater pumps are responsible for supplying feedwater to the steam turbine’s boiler and are a critical link in the steam-water cycle. Low-pressure feedwater pumps operate at a relatively fixed speed, avoiding frequent and significant fluctuations. Speed ​​monitoring requires precise capture within a fixed speed range without signal loss. Operating pressures and temperatures are moderate, eliminating the challenges of extreme operating conditions.

The CS-1-D-065-06-01 magnetoresistive speed sensor’s measurement accuracy fully meets the monitoring requirements of low-pressure feedwater pumps. Its ability to capture fixed speeds is stable, eliminating signal drift due to small speed fluctuations. Furthermore, the sensor’s fast response provides timely feedback on feedwater pump speed anomalies, allowing for equipment adjustments. Unlike eddy current sensors, it requires no complex signal processing modules and can be directly connected to the monitoring system, reducing the cost of supporting equipment. The high accuracy of eddy current speed sensors doesn’t offer advantages for low-pressure feedwater pumps—they don’t require micron-level speed measurement accuracy, and magnetoresistive sensors are more than adequate. Furthermore, eddy current sensors require a dedicated signal processing module, further increasing the procurement budget. Furthermore, the eddy current sensor’s extreme pressure and temperature resistance, which is often required in the simple installation environment of low-pressure feedwater pumps, makes it seem overkill. Therefore, the CS-1-D-065-06-01 magnetoresistive speed sensor offers a more cost-effective solution for low-pressure feedwater pump speed monitoring.

3. Condensate Pumps: Easy Maintenance in a Low-Vibration Environment

Condensate pumps are responsible for recovering steam condensate discharged from steam turbines and returning it to the boiler, thus recycling water resources. They operate with minimal vibration and in a relatively clean environment. The core requirements for speed monitoring are long-term stable operation and reduced maintenance. If the condensate pump is shut down for maintenance, it will affect the turbine’s water circulation efficiency. The CS-1-D-065-06-01 magnetoresistive speed sensor features a simple structure, no complex moving parts, and a low failure rate. It provides long-term, stable monitoring of condensate pump speed. It’s also easy to maintain—it doesn’t require regular disassembly and calibration, requiring only occasional cleaning of the probe surface. This reduces maintenance costs and minimizes downtime, making it ideal for condensate pumps that operate continuously.

Eddy-current speed sensors have a complex structure, and their probes are susceptible to wear and tear over time. These sensors require regular probe replacement and require maintenance intervals, increasing maintenance costs and impacting the continuous operation of the condensate pump. Furthermore, the eddy-current type is expensive, making such a high investment unnecessary in the low-vibration, easy-to-maintain environment of condensate pumps. Therefore, this magnetoresistive speed sensor is a more cost-effective choice for condensate pump speed monitoring.

4. High-Pressure Oil Pump: Cost-Effective for Short-Term Use

The high-pressure oil pump primarily operates during turbine startup, providing high-pressure lubricating oil to the rotor and bearings. Once the turbine is operating normally, it switches to the lubrication oil pump. It has a short service life, and the speed monitoring requirements are “stable signal during startup and manageable costs”—since it will be idle for long periods, there’s no need to invest in a high-precision sensor.

The CS-1-D-065-06-01 magnetoresistive speed sensor is low-priced and perfectly meets the cost requirements for short-term high-pressure oil pump use. During startup, it stably monitors the high-pressure oil pump’s speed, ensuring effective lubrication during startup and preventing signal issues from impacting turbine startup. Furthermore, when this magnetoresistive speed sensor is idle, there’s no need to worry about aging due to its complex structure, ensuring it will function normally the next time it’s started.

Eddy-current speed sensors are expensive, and using them on high-pressure oil pumps for short periods of time is costly. Furthermore, when the high-pressure oil pump is idle, the eddy-current probe can become damp or oxidized if not used for an extended period, affecting signal accuracy the next time it’s used. Therefore, this magnetoresistive speed sensor is a more cost-effective choice for high-pressure oil pump speed monitoring.

As the monitoring requirements of the auxiliary equipment above demonstrate, choosing a speed sensor for steam turbine auxiliary equipment isn’t about price, but rather compatibility. As long as the performance of a magnetoresistive speed sensor meets the equipment’s speed monitoring needs, there’s no need to opt for a more expensive eddy-current type. The CS-1-D-065-06-01, a magnetoresistive speed sensor, offers advantages in cost, installation, and maintenance, perfectly matching the monitoring needs of most auxiliary equipment: stable operating conditions, moderate accuracy requirements, and the need for cost control and reduced maintenance.

If you need a speed sensor for your steam turbine auxiliary equipment and are unsure whether to choose a magnetoresistive or eddy-current type, or would like to inquire about the compatibility of the CS-1-D-065-06-01 magnetoresistive speed sensor with your equipment, please contact us:
E-mail: sales@yoyik.com
Tel: +86-838-2226655
Whatsapp: +86-13618105229
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Sensor 5500-V-B
lvdt secondary voltage TDZ-1E-011 0-105
Pressure switch(High safety oil pressure1Low) BH-038011-038
linear motion position sensor TD-1-200
replacing oil tank gauge LS15 S3F560A
Smart Temperature Monitor WK-P2T(HT)
transmitter XCBSQ-02-300-02-01
Bolt electric heating rod ZJ-20-19A
Turbine bolt electric heating rod ZJ-20-3
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SWITCH PRESSURE PSB100AF1A
INTELLIGENT CONTROL DEVICE EDJ-M/TH2/D/C/DC110V/Z
lvdt displacement 2000TDZ-A
Displacement Transducer 6000TDGN
Eddy Current Signal Converter CON021/912-015
controller DSE7310-002-00
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Eddy Current Sensor PR6422/100-121
Furnace tube leakage channel detection board JCB-2
PRESSURE SWITCH TBN JACKING OI 403212-QFA013
OIL FILTER DP TRANSMITTER VL5GW2.1/123A5
Speed sensor CS-1-G-075-3
Temperature Sensor WZPK2-240
Turbine bolt electric heating rod ZJ-20-T19
intelligence Hand Operator NPDF-D110F3
Sensor Unit 71107554
Axial Displacement Transducer ɸ Eddy Current Transducer(Axial Displacement) M14 X 1.5
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INVERTER ALTIVAR ATV320D11N4B
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