Hukseflux VU01, User Manual, Page: 9 / 25

VU01 manual v1614 9/25
3 Specifications of VU01
3.1 Specifications of VU01
VU01 is a high-quality ventilation unit that may be used with pyranometer models SR20,
SR20-D2, SR22, SR25 and SR25-D1, and pyrgeometer models IR20 and IR20WS. Its
purpose is to improve the dependability of the measurement. Measurement accuracy
improves because offsets are reduced. Reliability benefits from prevention of dew and
frost formation and quick evaporation and sublimation of water and snow. For
specifications of pyranometers and pyrgeometers, please consult the SR20, SR20-D2,
SR22, SR25, SR25-D1 and IR20 manuals.
Table 3.1.1 Specifications of VU01 (continued on next page)
VU01 SPECIFICATIONS
Compatible instruments SR20, SR20-D2, SR22, SR25, SR25-D1, IR20, IR20WS
Compliance with standards ISO/TR 9901
BSRN operations manual
Rated operating power 7.8 W at 12 VDC (unheated)
Rated operating voltage range 10.8 to 13.2 V
Rated air flow 50 m 3 /hr
Rated operating temperature range -40 to +70 o C
Fan status signal 2.5 VDC (optional use)
High = fan OK = 2.5 V
Low = fan NOT OK =
≤
0.4 V
Heating 5 and 10 W at 12 VDC (optional use)
Increase of air temperature 0.5 o C at 0 W heating; 1.0 o C at 5 W heating;
1.5 o C at 10 W heating
Zero offset a SR20 ventilated 2.5 W/m 2 at 0 W heating
Offset SR20 by heating -2 W/m 2 at 5 W heating
Offset SR20 by heating -4 W/m 2 at 10 W heating
Offset IR20 by heating 0 W/m 2 at 5 W heating
Offset IR20 by heating 0 W/m 2 at 10 W heating
Cable resistance 0.3 Ω/m (2 x 0.15 Ω/m)
Voltage drop at 7.8 W ventilation 0.2 V/m
Voltage drop at 10 W heating power 0.12 V/m
Footprint diameter 0.17 m
Fan rotation rate 5050 to 5400 1/min at 12 VDC
Standard cable length (see options) 5 m
Cable diameter 5.3 x 10 -3 m
VU01 connector M16 straight connector, male thread, 10-pole
VU01 connector type
HUMMEL AG 7.820.400.000 straight connector, male
thread, for cable 5 to 9 x 10
-3 m
Cable connector M16 straight connector, female thread, 10-pole
Cable connector type HUMMEL AG 7.810.300.00M straight connector, female
thread, for cable 3 to 6 x 10
-3 m, special version
Connector protection class IP67 / IP69K per EN 60 529 (connected)
Cable replacement replacement cable with cable connector can be ordered
separately from Hukseflux
IP protection class VU01 IP54