| Task | Frequency |
|---|---|
| Clean the transmitter and receiver windows | Annually or more often if conditions require it |
| Perform guided calibration check using mode calcheck command, (and, if needed, calibration adjustment using mode adjust command) | Annually |
| Send field calibrator kit to Vaisala for calibration | Every 3–5 years |
| Clean painted surfaces | Annually |
| Check the condition of the painted surfaces, and paint them when necessary | Annually |
| Clean and check the condition of external sensors | Annually |
| WARNING Follow local and state legislation and regulations on occupational safety. |
| WARNING Do not perform installation or maintenance procedures when there is a risk of thunderstorm or lightning activity in the area. |
| WARNING To avoid injuries and to avoid damaging the instrument, do not place a ladder or similar against the instrument. |
| WARNING Some instruments and sensors or versions are heated. To avoid injury, do not touch heated parts when heating is on. |
| WARNING When the TX optical power alarm is on, disconnect power before performing any maintenance operations on the transmitter. |
| WARNING Do not look directly in the transmitter with magnifying optics (such as glasses, binoculars and telescopes). |
| WARNING When operating the forward scatter sensor, do not look at the transmitter of the forward scatter sensor from the beam direction. |
| CAUTION Only qualified maintenance personnel may perform maintenance procedures. |
| CAUTION To maximize performance, complete the maintenance tasks according to the recommended schedule. |