Apogee SI-421 Kullanıcı El Kitabı - Sayfa 17

Ölçüm Cihazları Apogee SI-421 için çevrimiçi göz atın veya pdf Kullanıcı El Kitabı indirin. Apogee SI-421 20 sayfaları. Infrared radiometer
Ayrıca Apogee SI-421 için: Kullanıcı El Kitabı (20 sayfalar), Kullanıcı El Kitabı (20 sayfalar)

Sayfayı Yazdır

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 SI series radiometers 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

support-recalibration-repairs/).

(http://www.apogeeinstruments.com/tech-