Emissivity is a key parameter for measuring the ability of an object's surface to radiate infrared energy, which directly affectsKleiber thermometerMeasurement accuracy. If the emissivity is not set correctly according to the tested material, it may result in temperature deviation exceeding ± 5 ℃. Here are three practical tips to avoid material misjudgment:

Tip 1: Refer to the material emissivity table and adjust it based on the surface condition

Reference authoritative data: The emissivity of different materials varies significantly, for example:

Metal: The emissivity of polished surfaces (such as stainless steel) is only 0.05~0.3, which increases to 0.6~0.8 after oxidation or roughness;

Non metallic materials: plastics, rubber, etc. typically have an emissivity of 0.8~0.95;

Coating material: The emissivity of matte black paint is close to 0.95, and the reflective coating may be as low as 0.3.

Attention to surface condition: The emissivity of the same material may vary under different treatments. For example, the emissivity of polished metal and oxidized metal may differ by several times, and the parameters need to be adjusted according to the actual surface state.

Tip 2: Compare contact temperature measurement and calibrate emissivity settings

Experimental steps:

Heat the target object to a stable temperature (recommended temperature difference from the environment>50 ℃);

Measure the actual temperature using a contact thermocouple or thermistor;

adjustKleiber thermometerThe emissivity is maintained until the displayed temperature matches the contact measurement value;

Record the emissivity at this time as the standard value for the material.

Applicable scenarios: Suitable for high-precision measurement or calibration of unknown materials, such as calibrating the emissivity of high-temperature metals in steel smelting.

Tip 3: Apply non reflective coatings to simplify emissivity settings

Operation Method:

Apply matte black paint or paste masking tape (emissivity ≈ 0.95) on the surface of reflective materials (such as polished metal);

Set the emissivity of the thermometer to 0.95 and measure the temperature in the coating area;

Measure the uncoated area and adjust the emissivity until the reading matches the coated area. At this point, the emissivity is the recommended value.

Advantages: Reduce reflection interference through physical means, avoid complex calculations, especially suitable for frequently measuring the same material.

Core principles for emissivity setting

Dynamic adjustment: If the surface state of the object being measured changes frequently (such as partially painted or partially exposed), the emissivity needs to be manually adjusted before each measurement; If there is little change, the parameters can be fixed.

Avoid reflection interference: When measuring reflective materials, stay away from high-temperature background sources or reduce reflection effects through coatings.

Regular verification: recalibrate emissivity quarterly or after changing measurement objects to ensure data accuracy.

Case: Emissivity calibration in the steel industry

Used by a certain steel plantKleiber thermometerMonitoring the temperature of the continuous casting billet, initially set at a polishing metal emissivity of 0.2, resulted in a measured value 80 ℃ lower than the actual value. After comparing and calibrating with black paint coating, the actual emissivity was determined to be 0.6. After adjustment, the measurement error was reduced to ± 2 ℃, significantly improving product quality.

Conclusion: By referring to the material table, comparing contact temperature measurement, and applying non reflective coatings, the problem of misjudgment of emissivity can be effectively avoided, ensuringKleiber thermometerRealize high-precision measurement of ± 1 ℃ within a wide temperature range of -30 ℃ to 500 ℃.