In a 600MW steam turbine unit, the feedwater pump is a core auxiliary equipment, and its operating stability is directly related to the efficiency and safety of the unit. Accurate monitoring of key parameters such as mechanical seal temperature and lubricating oil temperature is essential. The bimetallic thermometer WSSY-411 has become an ideal choice for this scenario due to its unique cost-performance balance. This article analyzes from four dimensions: technical principles, performance advantages, cost control and actual application effects, revealing how it can achieve a win-win situation of “precision and economy” in industrial temperature measurement under extreme working conditions.

I. Technical principle: temperature measurement wisdom driven by bimetallic strips

The WSSY-411 bimetallic thermometer works based on the principle of thermal expansion difference of bimetallic strips: two metal strips with different linear expansion coefficients are welded into a spiral temperature sensing element, which bends and deforms when the temperature changes, driving the pointer to rotate to indicate the temperature. Its core advantage lies in its passive design, which does not require an external power supply, and directly outputs visual readings through a mechanical structure, which is suitable for environments where the power system has strict requirements on electromagnetic compatibility.

Compared with traditional thermal resistors, the adaptability and vibration resistance of bimetallic thermometers are particularly outstanding in medium and low temperature. Under the complex working conditions of high-speed rotation of the feedwater pump and steam impact, its diversified structural designs such as radial type and axial type can effectively reduce the interference of mechanical stress on measurement.

II. Performance advantages: industrial-grade reliability and intelligent upgrade

1. Multi-scenario adaptability

The bimetallic thermometer WSSY-411 provides three dial diameters of Φ60mm, Φ100mm, and Φ150mm, supports multiple installation methods such as axial, radial, and universal, and can be flexibly adapted to narrow or complex spaces such as the mechanical seal cavity of the feedwater pump and the lubricating oil return pipe. Its IP55 protection level and stainless steel/ceramic composite coating design enable it to maintain stable performance in high-temperature steam and corrosive media.

2. Intelligent operation and maintenance support

Through electrical contact output and dual-branch redundant design, the bimetallic thermometer WSSY-411 can be connected to the DCS system for remote monitoring. Although the upper limit of WSSY-411 is 500℃, the typical monitoring points (such as lubricating oil temperature and seal water return temperature) of the 600MW unit feedwater pump are mostly below 150℃, which fully meets the demand. For occasional high temperature scenarios, gradient installation or thermal resistor redundancy can be used to achieve complementarity.

When looking for high-quality, reliable bimetal thermometers, 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:
linear proximity sensor HTD-50-3
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bolts heater 1.2311(4)-φ15X500
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Flow indicator LZG15-20
Frequency Converter PROF31A 1122
Magnetic Float Level Meter UHC-517C
Mica components B69H-16-W
TSI Relay card A6500-RC
displacement measurement transducer C9231117
Hydrogen Leakage Probe LH-1500B
led rpm gauge JM-C-3ZF
FLAME DETECTING PROCESSOR MODULE ZFDZ-VIII
Temperature sensor Platinum PT100 WZPM2-001 L:10 m
Auxiliary switch for circuit breaker NQ21H082889
Pressure Guage HG41/60/0/25MPa/G1/4/LM
PLATINUM RTD WZP2-6.4/35/1.5/7
Current converter CE-VZ01A-52M1-0.2
LVDT Sensor TD-1-0200-10-01-01
BELT BACK PLATE GT2150507
speed sensor cs1-d065-05-01
Pressure Controller Inteligence Display QYJ-10-Kpa
THERMOCOUPLE WREKD2-03