MAINTENANCE AND RECALIBRATION
Blocking of the optical path between the target and detector can cause low readings. Occasionally, accumulated
materials on the diffuser of the upward-looking sensor can block the optical path in three common ways:
1.
Moisture or debris on the diffuser.
2.
Dust during periods of low rainfall.
3.
Salt deposit accumulation from evaporation of sea spray or sprinkler irrigation water.
Apogee Instruments upward-looking sensors have a domed diffuser and housing for improved self-cleaning from
rainfall, but active cleaning may be necessary. Dust or organic deposits are best removed using water, or window
cleaner, and a soft cloth or cotton swab. Salt deposits should be dissolved with vinegar and removed with a cloth
or cotton swab.
Salt deposits cannot be removed with solvents such as alcohol or acetone.
Use only gentle
pressure when cleaning the diffuser with a cotton swab or soft cloth to avoid scratching the outer surface. The
solvent should be allowed to do the cleaning, not mechanical force.
Never use abrasive material or cleaner on the
diffuser.
It is recommended that sensors 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/