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Influence of dust or dirt
The measurement may be incorrect when dirt, dust or fluid such as water or oil interferes
with measurement in the following ways.
• Adhesion on the protective glass: Blow the dirt off with clean air. If dirt persists, wipe the
glass surface gently using a soft cloth moistened with alcohol.
• Adhesion on the surface of the measurement target: Blow the dirt off with clean air or
wipe it off.
• Intrusion of floating dust or splash of fluid into the light-axis range: Take corrective
action such as installing a protective cover or air purge.
Other considerations
Influence of vibration
When the measurement target is vibrating, the measured value may fluctuate. In this case,
increase the number of averaging measurements to ensure more accurate measurement.
Measurement target
The measured value may be incorrect if the shape or surface condition of the target varies
with individual targets. In this case, measure a known target and use the calibration
function to correct the error.
Handling
Do not wipe the unit with a wet cloth, benzene, or thinner. This may cause discoloration or
deformation of the housing. If the unit becomes dirty, wipe it off with a cloth moistened with
a mild detergent and then wipe with a soft dry cloth.
Effect of atmospheric motions
Slow atmospheric motions may affect the measurement and result in fluctuation of the
measured value.
In such a case, take the following countermeasures:
• Enclose the sensor head in an appropriate enclosure.
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