Campbell CVF4 Manuál s instrukcemi stáhnout pdf (Strana 31)

CMP6-L, CMP10-L, CMP11-L, and CMP21-L Pyranometers

8.2 Changing the Desiccant

A desiccant-filled drying cartridge prevents dew from forming on the inner

sides of the domes; Campbell Scientific part number 27052 is the replacement

desiccant for this cartridge. The optional CVF3 or CVF4 Heater/Ventilator

Unit is also available to keep the pyranometer dome free from ice and dew (see

Appendix A, CVF3, CVF4 Heater/Ventilator). In some applications, the CVF3

or CVF4 may also reduce the deposition of dust on the pyranometer dome, and

therefore reduce the cleaning interval frequency.

The silica gel desiccant granules in the drying cartridge should be orange and

opaque. Replace the desiccant granules when they become translucent

(normally after several months). Refill packs of desiccant are shipped with the

pyranometer and can be purchased from Campbell Scientific. The drying

cartridge uses the content of one refill pack. Figure 8-2 shows the replacement

process.

When changing the desiccant, ensure that:

x The surfaces touching the rubber o-ring are clean. Dirt, in combination

with water, can cause corrosion, harming it.

x 7KH rubber o-ring is coated with silicon grease or petroleum jelly. The

grease coating improves the o-ring’s seal.

x The drying cartridge is tightly threaded into the pyranometer’s body.

Figure 8-2 Changing the desiccant

8.3 Check Sensor Output

It is also important to check the data returned from the sensor as it will show

the first indication of a fault. When doing this you should be aware of several

expected phenomena that can cause strange measurements. In particular on

clear, windless nights the outer dome temperature of horizontally placed

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Campbell CVF4 Manuál s instrukcemi Strana 31