Name:
xuxu
Subject:
Mistake 2 Ignoring Material Temperature Sensitivity—High-Temperature Probe Selection Remediation (Jul 9, 2025)
Prayer Request:
Overlooking how temperature affects probe materials is a common error, leading to premature failure or inaccurate data. Remediation involves matching material properties to operational temperatures.Sensor Calibrationwelcome to click on the website to learn more!
For example, using 304 stainless steel in 800°C environments is problematic—above 650°C, its chromium carbide precipitation weakens corrosion resistance, causing a 50% reduction in service life. The solution: upgrade to Inconel 718, which retains strength and oxidation resistance up to 1000°C. A refinery test showed Inconel probes lasted 2000 hours at 800°C, while 304 probes failed after 500 hours.
Another issue is plastic probes in moderate heat (100-200°C). PEEK plastic softens above 150°C, altering hole dimensions and introducing 3-5% error. Switching to polyimide (PI) plastic, which withstands 260°C, resolves this. A food drying system test found PI probes maintained accuracy at 200°C, while PEEK probes read 4% low due to thermal deformation.
Low-temperature scenarios have their own pitfalls. Carbon steel becomes brittle below -20°C, risking fracture during installation. Using 16MnDR low-temperature steel, which remains ductile to -40°C, prevents this. A cold storage airflow test saw zero failures with 16MnDR probes, compared to 30% breakage with carbon steel.
Remediation steps include: 1) mapping the operational temperature range; 2) checking material datasheets for critical thresholds (e.g., creep, softening, brittle transition); 3) testing prototypes in temperature chambers before full deployment.
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