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Influencing factors of measuring accuracy of infrared thermometer
- 2019-12-17-

Infrared thermometers will inevitably be affected by some factors when measuring. What are the main factors? Today, Wuxi very Xiang Technology Co., Ltd. will take you to understand the main factors affected by the introduction:

Ambient temperature factor

The instrument should be used strictly in accordance with the ambient temperature indicated by the instrument's technical indicators. Beyond this range, the measurement error of the instrument will increase or even be damaged. When the ambient temperature is high, air-cooled, water-cooled devices or thermal protection sleeves can be used. The thermal protection sleeve can make the instrument work normally in the environment up to 200 ° C.

When the handheld thermometer is used from one environment to another environment with a large difference in temperature, the accuracy of the instrument will be temporarily reduced. In order to obtain the ideal temperature measurement result, the instrument should be placed at the work site for a period of time. Time (30 minutes less is recommended) before the instrument temperature and the ambient temperature reach equilibrium before use.

Air quality factor

Smoke, dust, other pollutants in the air, and unclean lenses will prevent the instrument from receiving enough infrared energy to meet the measurement accuracy, and the measurement error of the instrument will increase. Therefore, keep the lens clean often, and an air blower helps keep the lens free from contamination.

Electromagnetic interference factor

Keep the instrument as far away as possible from potential sources of electrical interference, such as electric equipment with large load changes. Use shielded wire for the output and input connections of the in-line instrument and ensure that the shielded wire is well grounded. In a strong interference environment, use an external protective tube. A rigid tube is better than a flexible tube. AC power from other equipment must not be routed into the same conduit.

envirnmental factor

When there are other high-temperature objects, light sources, or solar radiation around the measured object, these radiations will directly or indirectly enter the measurement optical path, causing measurement errors. In order to overcome the impact of environmental radiation, it is first necessary to prevent environmental radiation from directly entering the optical path. The measured object should be filled with the instrument's field of view as much as possible. For the indirect interference of environmental radiation, it can be eliminated by shielding.

Measuring angle factor

In order to ensure accurate measurement, the instrument should try to measure along the normal direction of the surface of the measured object (normal to the surface of the target). If it cannot be guaranteed in the normal direction, it should also be measured at an angle of 45 ° to the normal direction, otherwise the display value of the instrument will be low.

The above points focus on the influencing factors of the measurement accuracy of the infrared thermometer.