Kipp&Zonen 2AP Sun Tracker - Manual (Page 48)

INSTALLATION AND SETUP
47
The Win2AP Pyranometer Installation page is provided with a button to perform a motion test (page
9 of the Suntracker Setup Procedure). This allows verification that the installed instrumentation and
cabling will not interfere with any obstructions around the Suntracker Assembly. The Motion Test
procedure will cycle the Suntracker through a complete range of motion. Watch for any cable
binding or snagging. Press the stop button at any time to halt the testing motion.
Additional CV2 information:
The CV2 Ventilation Unit is designed for ventilating Kipp & Zonen solar radiation sensors
(pyranometers and pyrgeometers) and can be used outdoors under all weather conditions. The CV2
is available with or without a heater, see table 5. The reliability and accuracy of solar radiation
measurements are improved significantly by using this controlled heated airflow over the
radiometer. The main advantages of ventilating are:
1. No precipitation of morning dew, which otherwise would disturb the measurement.
2. No deposition of hoarfrost, which otherwise would disturb the measurement (heater
necessary).
3. Less infrared offset, due to infrared radiation exchange between the sensor element and
the glass dome under calm clear sky conditions.
Table 5:
CV 2 Specifications.
Ventilation power
5 Watt continuous
Heating (optional) 5 Watt and 10 Watt
Operating temperature -30ºC to +70ºC
Air temperature rise caused by CV 2
< 0.25 K @ 0 Watt (blower only)
< 0.5 K @ 5 Watt (heater)
< 1 K @ 10 Watt (heater)
Offset caused by heater < 1 W/m 2 using pyranometer CM11
Cable length 10 m
Power required 12 Volt DC, 1.25 A (with heater)