Apogee MI-210 Gebruikershandleiding - Pagina 12
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MAINTENANCE AND RECALIBRATION
Blocking of the optical path between the target and detector, often due to moisture or debris on the filter, is a common
cause of inaccurate measurements. The filter in the separate sensor of the MI series infrared temperature meters is inset in an
aperture, but can become partially blocked in four ways:
1.
Dew or frost formation on the filter.
2.
Salt deposit accumulation on the filter, due to evaporating irrigation water or sea spray. This leaves a thin white film
on the filter surface. Salt deposits can be removed with a dilute acid (e.g., vinegar). Salt deposits cannot be
removed with solvents such as alcohol or acetone.
3.
Dust and dirt deposition in the aperture and on the filter (usually a larger problem in windy environments). Dust
and dirt are best removed with deionized water, rubbing alcohol, or in extreme cases, acetone.
4.
Spiders/insects and/or nests in the aperture leading to the filter. If spiders/insects are a problem, repellent should
be applied around the aperture entrance (not on the filter).
Clean inner threads of the aperture and the filter with a cotton swab dipped in the appropriate solvent. Never use an
abrasive material on the filter. Use only gentle pressure when cleaning the filter with a cotton swab, to avoid scratching
the outer surface. The solvent should be allowed to do the cleaning, not mechanical force.
It is recommended that infrared radiometers be recalibrated every two years. See the Apogee webpage for details regarding
return of sensors for recalibration (http://www.apogeeinstruments.com/tech-support-recalibration-repairs/).
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