In heating systems, accurate pipe thermometers are vital for optimal regulation and efficiency. Here are 4 key categories of practical measures—covering installation, maintenance, and environmental factors—for valve professionals to ensure reliable readings

2025-09-26

I. Precise Installation: Avoid Valves/Elbows, Focus on 3 Core Points

Choose the Right Location: Keep away from valves, elbows, and pipe ends (prone to uneven temperature/eddy currents). Prioritize installation on straight pipe sections, with a distance of at least 5 times the pipe diameter from pipe fittings to ensure accurate measurement of the real average temperature.

Standardize Installation Method: For insert-type thermometers, the insertion depth should reach 1/3 to 1/2 of the pipe diameter (to ensure full contact between the temperature-sensing element and the medium). For surface-type thermometers, ensure tight fit with the pipe surface (no air/impurities), and use thermal conductive adhesive or special clamps for fixation to ensure good heat conduction.

Pay Attention to Installation Angle: The temperature-sensing element of insert-type thermometers should be installed perpendicular to or at a 45° angle to the fluid flow direction. Avoid parallel installation (to prevent measurement errors caused by fluid scouring).

II. Regular Maintenance and Calibration: Avoid “Inaccuracy” with 3 Steps

Daily Cleaning and Inspection: Regularly clean dust/oil stains on the surface (to prevent impact on heat conduction), and check for external damage and loose wiring.

Timely Calibration: Send the thermometer to a professional metrology and calibration institution for calibration according to the cycle specified in the user manual (compare and adjust parameters with high-precision standard thermometers). Shorten the calibration cycle for scenarios with frequent use or high-precision requirements.

Establish Calibration Records: Record the time, results, and institution of each calibration. Identify potential performance degradation of the thermometer in advance by analyzing the trend of calibration data.

III. Address Interference and Environmental Factors: Reduce External Influences

Electromagnetic Interference (EMI) Protection: Use shielded cables for the thermometer’s signal lines and ensure reliable grounding. Separate the signal lines from high-voltage lines during laying (avoid parallel routing).

Temperature and Humidity Control: For environments with large temperature and humidity fluctuations, provide thermal insulation/heat dissipation for the thermometer. In high-humidity environments, add moisture-proof sealing (to prevent water vapor from entering the interior and affecting circuit performance).

Handle Pressure and Vibration: Install shock absorption devices to reduce the impact of pipe vibration. Select thermometers with pressure fluctuation resistance, or install pressure compensation devices at locations with large pressure changes.

IV. System Optimization and Personnel Training: Improve Accuracy through Management

Data Optimization: Adopt multi-point measurement and data averaging. Perform filtering on collected data (to remove noise/outliers) and use software algorithms for data correction.

Cross-Verification with Other Instruments: Compare the thermometer data with that of other related instruments in the heating system (e.g., flow meters, pressure gauges) to judge the rationality of the measurement results. Conduct timely troubleshooting if abnormalities are found.

Personnel Training: Provide professional training for operation and maintenance/operating personnel, covering the working principle, installation, maintenance, and data processing of pipe thermometers to ensure correct use and maintenance.

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