In the operation monitoring of high-speed rotating equipment such as steam turbines, magnetoresistive speed sensors are widely used in speed measurement because of their characteristics such as no need for external power supply, strong anti-interference ability, and adaptability to harsh environments. Among them, the SZCB-01 series magnetoresistive speed sensor has become an important tool in the industrial field due to its stability and reliability. However, the performance of the sensor is closely related to the gap between its probe and the top of the gear teeth. This small distance not only affects the stability of the signal amplitude, but also directly affects the measurement accuracy and the safety of long-term operation of the equipment. Therefore, scientifically and rationally adjusting the gap between the probe and the top of the gear teeth is a key link in optimizing the performance of the sensor.

1. The mechanism of the gap between the probe and the top of the gear teeth

The working principle of the magnetoresistive speed sensor SZCB-01-A00-B080-C00-D03 is based on electromagnetic induction. When the sensor probe approaches the rotating gear, the top of the gear teeth and the valley of the gear teeth alternately cut the magnetic lines of force, causing the magnetic flux to change, and then generating an alternating voltage signal in the coil inside the sensor. The amplitude and frequency of this signal correspond to the speed and number of teeth of the gear, respectively. However, due to the nonlinearity of the magnetic circuit characteristics, the gap between the probe and the gear will significantly affect the signal output.

Too large a gap will lead to insufficient flux change, thereby reducing the signal amplitude, making it difficult for the speed sensor SZCB-01-A00-B080-C00-D03 to capture effective signals at low speeds; while too small a gap may cause probe wear due to physical contact or friction, or even damage the internal structure of the sensor. In addition, too small a gap will increase the interference of mechanical vibration on the signal, resulting in output waveform distortion. Therefore, finding an optimal gap range that can both ensure signal strength and avoid mechanical damage is the core goal of achieving efficient operation of the sensor.

2. Technical points of gap adjustment

Adjusting the gap between the speed probe SZCB-01-A00-B080-C00-D03 and the gear tooth top requires a systematic approach, combining theoretical calculations with practical experience, and gradually approaching the optimal value. First, the material, modulus and tooth shape design of the gear must be clarified, because these parameters directly affect the efficiency of magnetic flux change. For example, involute tooth profiles can provide more uniform magnetic field distribution and reduce waveform distortion, while gears with larger modulus usually have higher magnetic conductivity, which helps to increase signal amplitude.

Secondly, during installation, the coaxiality of the speed probe SZCB-01-A00-B080-C00-D03 and the gear axis must be ensured. If the probe deviates from the center position, the magnetic field changes generated when the gear rotates will be asymmetric, resulting in increased signal fluctuations. To this end, laser calibrators or precision measuring tools can be used to assist in positioning to ensure that the front end of the probe is perpendicular to the gear surface and aligned along the axial direction.

It is worth noting that environmental factors should not be ignored either. High temperature, oil or water vapor may cause the SZCB-01-A00-B080-C00-D03 speed sensor housing to expand or the probe surface to oxidize, thereby changing the actual gap. Therefore, after the adjustment is completed, the gap status should be checked regularly and necessary compensation adjustments should be made according to environmental conditions. For example, in a steam environment, a probe made of corrosion-resistant material can be selected, and a slightly larger safety margin can be reserved to cope with the thermal expansion effect.

3. Practical significance of signal amplitude optimization

By accurately adjusting the gap, the SZCB-01-A00-B080-C00-D03 sensor can achieve stable signal output under different working conditions. For high-speed equipment such as steam turbines, the optimization of signal amplitude not only improves the speed measurement accuracy, but also enhances the response capability to abnormal working conditions. For example, during the start-up or shutdown of the unit, the speed changes frequently and the amplitude is large. Reasonable gap setting can ensure that the sensor can still capture reliable pulse signals in the low-speed section, thereby providing timely feedback to the control system.

In addition, the stability of the signal amplitude also directly affects the analytical ability of the secondary instrument. Many modern speed monitoring systems rely on digital signal processing algorithms. If the input signal amplitude fluctuates too much, it may cause false triggering or missed detection. By optimizing the gap, the sine wave or square wave signal output by the sensor is more regular, which reduces the difficulty of filtering and shaping of subsequent circuits and improves the reliability of the overall system.

4. Maintenance strategy in long-term operation

Although gap adjustment can significantly improve the performance of the speed sensor SZCB-01-A00-B080-C00-D03 in the short term, it is still necessary to pay attention to maintenance details in long-term operation. First, clean the probe surface regularly to prevent dust, oil or iron filings from accumulating and causing gap failure. It can be wiped with anhydrous ethanol or special cleaning agents, and avoid using hard tools to scratch the probe end face. Secondly, check the tightness of the threaded connection parts to prevent loosening and deviation caused by vibration. For key equipment, it is recommended to conduct a comprehensive inspection every quarter, including insulation resistance test, signal amplitude comparison and mechanical alignment verification.

When looking for high-quality, reliable rotational speed sensors, YOYIK is undoubtedly a choice worth considering. The company specializes in providing a variety of power equipment including steam turbine accessories, and has won wide acclaim for its high-quality products and services. For more information or inquiries, please contact the customer service below:
E-mail: sales@yoyik.com
Tel: +86-838-2226655
Whatsapp: +86-13618105229

Yoyik offers various types of spare parts for steam turbines, generators, boilers in power plants:
Fan for forced air cooling of dry type power transformers GFD680-200
Driver MGFAS2-DSM-DSC-B/ECR
Transmitter 3051CD3A22A1AM5B4DF
toxic gas alarm controller MDL-2104-NH3
linear variable differential transducer lvdt HTD-50-3
capactior CBB61
Flow Meter LZD-25/RR1/M9/E2/B1/Q
PLATINUMM RESISTANCE THERMOMETER 935-14-72
Flash buzzer AD16-22SM/R31/AC220V
ELECTRODE LEVEL GAUGE DQS6-25-19Y
Vibration Sensor PR9268/203-000
sensor CS-1-D-065
PS Board CS057210P
precision displacement sensor HL-6-300-15
Magnetoresistive probe D683WK
rpm tachometer gauge JM-D-5KF
Differential Pressure Transmitter 3051CD4A22A1AM5B4Q4TK
Limit switch ME-8108
Serial interface 6ES7241-1AH32-0XB0
Brake ZD280-A
MODULE SMART POSITIONER RV SOOTBLOWER Y T 2500
Probe 9200-01-01-10-00
SWITCH LEVEL RF8800
Mica components B69H-16-W
Normal / Reverse Speed Monitor S2184A
Probe 330103-00-06-10-02-00
RTD WZPM2-08-120-M18-S
THERMAL RESISTANCE SENSOR WZPM2-08-102.5-M18-S
THREE-PHASE TRANSFORMER SG-200VA-B
K-Type Thermocouple WRN 430
probe proximity PR6424/010-110
Velocity Sensor PTM0793V-K
Guide vane opening meter DYK-11-5013
Plug-in infrared sensor HSDS-40/T