The temperature is low in winter. If the ultrasonic flowmeter is installed outdoors or on a pipeline without thermal insulation measures, it is easy to be damaged due to medium freezing. The following 5 tips can be used for anti-freezing maintenance:
Tip 1: Do a good job of thermal insulation for pipelines and equipment. Wrap the flowmeter and the pipeline within 3 meters before and after it tightly with thermal insulation cotton (rock wool or polyurethane is recommended, and the thermal insulation thickness is determined according to the minimum local temperature, generally not less than 50mm). Wrap the outer layer of the thermal insulation cotton with waterproof cloth to prevent rain and snow from seeping in and causing thermal insulation failure. For cold regions in northern China, a heating cable can be installed inside the thermal insulation layer. The power of the heating cable is 10-20W/m, which can maintain the pipeline temperature above 0℃ after power-on to prevent medium freezing.
Tip 2: Choose the installation location reasonably. Try to install the flowmeter indoors or in a sheltered area to avoid direct exposure to wind and snow. If it must be installed outdoors, a protective shed should be built. The height of the protective shed should not be less than 1.5 meters to ensure good ventilation and prevent the equipment from being exposed to direct sunlight and rain soaking.
Tip 3: Regularly check the medium state. In winter, if the measured medium is water or other easy-to-freeze liquids, it is necessary to check the medium temperature displayed by the equipment regularly every day. If the temperature is close to 0℃, the medium flow rate can be appropriately increased (by adjusting the pipeline valve), or antifreeze can be added to the medium (it is necessary to confirm that the antifreeze is compatible with the pipeline and equipment materials to avoid corrosion). If the equipment is not used for a long time, the medium in the pipeline should be drained to prevent damage to the equipment due to freezing and expansion.
Tip 4: Check the sealing performance of the equipment. Check whether the sealing rubber strip of the flowmeter casing is aged or damaged. If the sealing is poor, rain and snow will seep into the equipment and cause a short circuit. Silicone sealant can be used to reinforce the sealed parts regularly. At the same time, check whether the waterproof cap at the probe interface is intact. If it is damaged, it should be replaced in time to prevent water from entering the inside of the probe.
Tip 5: Do a good job of emergency treatment. If it is found that the medium has frozen, do not force to power on or knock the equipment. First, close the pipeline valve to stop the medium flow, then slowly pour warm water (temperature not exceeding 60℃) on the frozen part. After the medium is completely melted, check whether the equipment has water leakage, component damage and other conditions. Confirm that it is normal before powering on.
Post time: Oct-21-2025