Description
Feature
- Increase the interval between maintenance visits
- Increase the accuracy of measure data
- No precipitation or condensation on the sensor
- Reduce the zero offset of the sensors
- Frost, snow and ice can be melted
- The World Meteorological Organisation (WMO) and the Baseline Surface Radiation Network (BSRN) guidelines advise using a ventilator to optimise the performance of radiometers in general.
The CVF 4 Ventilation unit can be used to improve the measurement accuracy of Kipp & Zonen pyranometers, pyrgeometers and radiometers. The ventilation unit generates a constant swirling air flow around the sensor to prevent dust and dirt from settling, to dissipate rain drops and to stabilise the dome temperature. The unit is also fitted with an integrated heater that can be used to keep the air just above ambient temperature.
The CVF4 is suitable for all CM, CMP, SMP, CG, CGR and CUV radiometers. However with the CMP3 and SMP3 and CGR3 the ventilation effect will be less due to the larger opening around the dome. The CVF4 is meant to run continuously but the heater can either be switched on permanently for cold regions or be switched by a data logger or clock to remove dew in the morning and be switched off afterwards. In that case the heater should be operated from about 2 hours before sunrise to an hour after sunrise. This saves power in situations where power is limited such as PV operated sites.
Specifications
| Air temp rise caused by CVF4: |
<0.25°C @ 0 Watt (ventilator only) <1°C @ 5.5 Watt (Heater) |
| Tacho Output: |
5V, 2 pulses per revolution 8800 pulses per minute (nominal) |
| Power Supply: | 12vDC @ 0.9A (with heater) |
| Power Consumption: | 5W, 5.5W with heating |
| Operational Temp Range: | -40 to +70°C |
| Humidity Range: | 0 to 100% non condensing |
| IP Rating: | IP54 |
