Causes of probe corrosion in thermal gas mass flow meters

Project Overview

Probe corrosion of thermal gas mass flow meters may be caused by the following reasons:

1. Medium corrosivity: If the measured gas is corrosive, such as containing acidic or alkaline components, Moisture or other corrosive media, the probe material may not be able to resist chemical corrosion caused by long-term exposure to these media.

2. Effect of high temperature: In a high-temperature environment, especially when measuring high-temperature gases, the probe material may corrode due to high-temperature oxidation. Prolonged high temperatures may also accelerate other corrosion processes.

3. Humidity and condensation: Condensation caused by high moisture content in the gas or large environmental temperature differences will make the probe surface moist, which may cause electrochemical corrosion or promote the activity of other corrosive media.

4. Dirty gas: The gas contains solid particles, droplets or impurities. These substances may wear the protective layer on the surface of the probe, expose the base material and cause corrosion.

5. Improper material selection: If the probe material is improperly selected and cannot adapt to the characteristics of the medium being measured, the corrosion process will be accelerated. For example, some metals corrode rapidly in certain gas environments.

6. Electrochemical reaction: In the presence of different metals, especially in humid environments, micro-battery effects may form, leading to electrochemical corrosion.

To prevent or reduce probe corrosion, the following measures can be taken:

1. Select corrosion-resistant materials suitable for the medium characteristics to make the probe.

2. Clean and maintain regularly to avoid sediment accumulation.

3. Ensure the flow meter is properly designed to avoid condensation and extreme temperature conditions.

4. For extremely corrosive environments, consider special anti-corrosion treatment or coating on the surface of the probe.

5. Use isolators or filters to purify gases and reduce exposure to corrosive particles or liquids.

6. Regularly check and monitor the status of the probe, and replace it promptly if signs of corrosion are found.