CVF4 Ventilation Unit

CVF4 is designed to be used with Kipp & Zonen’s CMP/SMP pyranometers, CGR4 pyrgeometer and CUV5 total UV radiometer.

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CVF4 Ventilation Unit

Key features

  • Improves stability of measurements
  • Easy to install and low maintenance
  • Pulse output to monitor performance

Ventilation of radiometers improves the reliability and accuracy of the measurement by reducing dust, raindrops and dew on the dome. With thermopile-based instruments, ventilation stabilises the temperature of the radiometer and suppresses thermal offsets. The integrated heater can be used to disperse precipitation and melt frost.

CVF4 is a low power, low maintenance ventilation unit. The only part that needs maintenance is the removable air inlet filter, which should be checked at regular intervals and cleaned or replaced when necessary.

The flow that the CVF4 creates is unique. At the top of the pyranometer dome, the flow is very high and it swirls to improve the air distribution over the dome. The position of the heaters and the new cover material ensures that only half the heating power is needed to melt frost and snow compared to older ventilation units.

CVF4 can be mounted on the 2AP and SOLYS2 sun trackers and the CM121C shadow ring.

CVF4 replaces the successful and widely used CVF3 ventilation unit.

Technical specification

Power supply 12 ± 1 VDC
Operational temperature range -40 to +70 °C
Ventilation power 6.3 W (continuously)
Heating power 7 W (when required)
Heater induced offset < 1W/m² (with CMP pyranometers)
Zero offset a) reduction 50% (with double-dome C/SMP pyranometers)
Designed for C/SMP6, 10, 11, 21, CMP22; C/SGR4; C/SUV C/SMP3 and C/SGR3 with reduced performance
Ingress Protection (IP) rating 68