Campbell CVF4 Instrukcja Obsługi Pobierz pdf (Strona 34)

A-1

Appendix A. CVF3, CVF4 Heater

Ventilator

A.1 General Information

The CVF3 has been discontinued and replaced by the CVF4.

The CVF3 and CVF4 consist of a ventilation unit and heaters. The 5 W

ventilation unit uses a fan and inlet filter to draw clean air over the

pyranometer’s domes. The fan runs continuously to reduce dust and dirt

settling, to dissipate rain drops, and to stabilize the dome temperature.

The CVF3 has both a 5 W and a 10 W heater. The CVF4 has a 5.5 W heater.

The CVF3 5W heater raises the temperature of the dome slightly above

ambient temperature to prevent the formation of dew and frost. The CVF3 10

W heater is used to melt snow and ice. With improvements in design and

efficiency all of these preventative measures are performed by the CVF4 5.5 W

heater.

These power requirements are large compared to most Campbell Scientific

products. Because of this, the CVF3 and CVF4 require additional

consideration for power supplies and control. Please review these matters with

a Campbell Scienttific (Canada) Measurement Consultant so any concerns can

be addressed.

A.2 Siting

Siting information provided in Section 4.1, Siting, is pertinent when using the

CVF3 or CVF4 heater/ventilation. Additionally, the area directly under the

CVF3 or CVF4’s intake needs to be free from snow, leaves, or other

obstructions that could inhibit the air flow (see Figure A-1).

A-1 Transparent view of CVF3 showing air flow

Note

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Campbell CVF4 Instrukcja Obsługi Strona 34