Dew point transmitter is the core equipment for monitoring the moisture content in gases in the industrial field, ensuring production safety and product quality by accurately measuring dew point temperature. The following are the key maintenance methods:
1、 Sensor cleaning and protection
Regular surface cleaning
Use a dust-free cloth dipped in anhydrous ethanol to gently wipe the surface of the sensor, avoiding excessive force or sharp tools damaging the sensitive film layer.
For oil or hydrocarbon pollution, the probe can be soaked in isopropanol and dried; Chemical adsorbents need to be removed with specialized cleaning agents.
Corrosion and Pollution Prevention
Strictly avoid contact with corrosive gases. If accidentally exposed, immediately shut down the machine and contact the manufacturer for maintenance.
Install a pre filter in high dust environments to prevent particle clogging of the sensor.
2、 Electrical system and sealing inspection
Power supply and line maintenance
Regularly check whether the power supply voltage meets the specifications, and the fluctuation range should be controlled within ± 5%.
Tighten the wiring terminals and replace aging or damaged signal wires to avoid signal interruption caused by looseness.
Special requirements for explosion-proof models
Check the integrity of explosion-proof seals and replace aging seals in a timely manner.
Conduct quarterly air tightness testing to ensure that the shell protection level meets IP65 or higher standards.
3、 Calibration and Verification Management
Periodic calibration
The conventional calibration cycle is 6-12 months, using saturated salt solution method or dual temperature and dual pressure method to generate standard humidity gas for comparison.
After long-term disuse, the zero point must be recalibrated before restarting.
Verification after calibration
Using cross validation method, verify the linear error with different concentrations of standard gases to ensure ≤± 1 ℃.
4、 Environmental adaptation and operation monitoring
Optimization of installation location
Avoid eddy current areas such as pipe bends and valves, and maintain a distance of at least 1.5 meters from the disturbance source.
Sampling pipeline length ≤ 3 meters, using stainless steel or polytetrafluoroethylene material to reduce adsorption.
Condition response
Install a cooler in a high-temperature environment to reduce the intake temperature to the sensor's applicable range.
Low temperature condensation risk scenario, add insulation layer and set up automatic condensation removal program.
5、 Special maintenance and recording system
Replacement of vulnerable parts
The desiccant should be replaced every 6 months, and in humid environments, it can be shortened to 3 months.
End of life determination for capacitive sensors: response time extended by 20% or baseline drift>± 3% FS.
Digital archive construction
Record the date/personnel/consumables of each cleaning, calibration, and maintenance, and predict the failure cycle through data analysis.
Store historical data for tracing abnormal operating conditions and guiding process improvement.
Maintenance benefits: Standardized maintenance can extend the service life of equipment by 20% to 30%, and the measurement error remains stable within ± 1 ℃. Enterprises should develop personalized maintenance calendars based on process characteristics and integrate preventive measures into their daily management system.