TiankangWSSBimetallic thermometers rely on the principle of thermal expansion of their bimetallic plates to1.0Grade accuracy has become the core instrument for medium and low temperature temperature measurement in fields such as petrochemicals and power energy. However, its long-term stability relies on a scientific maintenance system. This article is based on industrial practice and authoritative standards to construct a high-precision maintenance plan covering the entire chain of selection, installation, maintenance, and environmental protection.

1、 Accurate selection: adapting to working conditions from the source

1. Material matching corrosion environment
Neutral medium selection304Stainless steel protective tube needs to be upgraded to strong corrosion scenarios (such as chemical acid solutions and seawater)316LOr Ha ShiC-276Alloy. For example, in a coastal chemical plant, due to excessive chloride ions in the medium, ordinary stainless steel protective pipes experienced pitting corrosion within six months and were replaced with316LExtended lifespan to5Years or more.

2. Dynamic adaptation of temperature range
Avoid prolonged exposure to range limits: low temperature environment（-40℃The following measures should be taken to prevent metal brittleness and high temperature scenarios（>400℃）Fatigue resistant bimetallic sheets should be selected. The thermometer on the blast furnace platform of a certain steel enterprise has been used beyond the range for a long time, resulting in irreversible deformation of the bimetallic strip. After replacing it with a high-temperature resistant model, the error has increased±3℃drop to±0.5℃.

3. Optimization of probe length and insertion depth
pipe diameter200mmWhen inserting the probe, the depth should reach100mmIn high-speed fluid scenarios, the insertion depth needs to be shortened to50mmTo reduce resistance. A certain food processing plant experienced fluid erosion and wear due to excessively long probe rods, resulting in shortened20%Post life improvement3Twice.

2、 Standardized installation: reduce the risk of environmental interference

1. Avoid vibration and heat sources
Vibration sources (such as pumps, compressors)1Shock absorbers and high-temperature equipment need to be installed within a meter range（>200℃）3Installation beyond meters. The catalytic cracking unit of a certain refinery had high measurement values due to the proximity of the thermometer to the high-temperature pipeline and heat conduction5℃After adjusting the position, the error is eliminated.

2. Differentiated selection of sealing structure
Priority should be given to using sleeve flange connections for corrosive media to ensure sealing and maintenance convenience; Choose universal header for vibration scenarios, supporting360°Rotate to optimize the reading angle. The water supply system of a certain power boiler leaked due to flange sealing failure. After replacing it with a double-layer sealing rubber ring structure, the protection level was raised toIP65.

3. Insert depth dynamic calibration
The liquid medium needs to submerge the length of the temperature sensing element1.5More than twice, the gas medium needs to be submerged2Twice. Due to insufficient insertion depth, the measured value of a natural gas pipeline lags behind the actual temperature3Minutes, reduced response time after adjustment to40Within seconds.

3、 Full cycle maintenance: building a preventive management mechanism

1. Periodic calibration and cleaning
Calibrated annually with a standard temperature source (such as a platinum resistance thermometer), the error exceeds the range1%Replace the bimetallic strip when needed; Clean the dirt on the surface of the protective tube to prevent an increase in thermal resistance. A certain chemical enterprise had low measurement values due to irregular cleaning8℃Restore accuracy after calibration.

2. Lubrication and sealing maintenance of transmission mechanism
Supplement high-temperature lubricating grease to the gear set every quarter to reduce friction losses; Check the sealing ring of the header and replace it promptly when it ages. The cooling water system of a certain ship's diesel engine cylinder liner was stuck due to the failure of the sealing ring and the invasion of water vapor, which caused the pointer to become stuck. After replacement, the sensitivity was restored.

3. Emergency response to abnormal working conditions
Encountering overheating（>range90%）Overpressure（>6.3MPa）Immediately stop the machine and check the status of the components; Observe the wear of the casing in a high viscosity medium environment every month and replace it in advance if necessary. Due to the failure to promptly handle overheating conditions in a certain food sterilization kettle, the thermometer permanently failed, resulting in increased replacement costs2Ten thousand yuan.

4、 Environmental Protection: Dealing with Extreme Scenario Challenges

1. Corrosion environment protection
Regularly inspect the integrity of anti-corrosion coatings and apply epoxy resin when damaged; Adopting sacrificial anode protection method to slow down the corrosion rate of metals. The thermometer on a certain offshore platform has a limited lifespan due to lack of anti-corrosion treatment1After the implementation of coating maintenance, it has been extended to8Year.

2. high dust/Protection against damp environments
Install dust covers or waterproof breathable devices to prevent mechanical transmission components from being blocked by dust or corroded by condensed water. A textile factory has a high failure rate of thermometers due to lack of dust prevention30%After installing a protective cover, it was lowered to5%following.

3. Dynamic Archive Management and Redundancy Design
Record installation time, maintenance history, and fault conditions, and predict aging risks through trend analysis. Key equipment adopted“Dual table redundancy”Design to ensure stable operation of the system even in the event of a malfunction. Due to the implementation of redundant design, a nuclear power plant avoided an unplanned shutdown caused by a thermometer failure.

Conclusion

TiankangWSSHigh precision maintenance of bimetallic thermometers requires construction“selection-install-maintenance-protection”Full chain system. By implementing measures such as material adaptation, dynamic calibration, and environmental protection, the stability of the instrument can be significantly improved, and its service life can be extended8Over years old, providing reliable temperature monitoring guarantee for industrial production.