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Hukseflux VU01, User Manual, Page: 4 / 25

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VU01 manual v1614  

 

 

 4/25 

List of symbols 

Quantities

 

 

 

 

 

 

 

 

Symbol

 

 

Unit 

 
Voltage output 

 

 

 

 

 

 

U 

 

 

V 

Electrical resistance 

 

 

 

 

 

R 

 

 

 

Current 

 

 

 

 

 

 

 

I 

 

 

A 

Time in seconds   

 

 

 

 

 

t 

 

 

s 

Rotation rate 

 

 

 

 

 

 

N 

 

 

1/min 

 
Supply voltage 

 

 

 

 

 

 

U

supply  

 

V

 

 

 

Voltage drop over cable   

 

 

 

 

U

drop

   

 

V 

 

Fan voltage supply 

 

 

 

 

 

U

fan

   

 

V 

 

Cable resistance   

 

 

 

 

 

R

cable   

 

 

Wire resistance per meter 

 

 

 

 

Re

wire 

 

 

/m   

Cable length 

 

 

 

 

 

 

L

cable

   

 

m 

 

 

Fan current draw   

 

 

 

 

 

I

fan 

 

 

A 

Fan status signal high   

 

 

 

 

U

S,high

  

 

V 

Fan status signal low 

 

 

 

 

 

U

S,low   

 

V 

Rotation rate treshold   

 

 

 

 

N

g

 

 

 

1/min

  

 

 

 

 

 

 

 

 

 
 
 

Summary of Contents for VU01

Page 1: ...USER MANUAL VU01 Ventilation unit for SR20 and SR22 pyranometers and IR20 pyrgeometers Copyright by Hukseflux manual v1620 www huksefluxusa com info huksefluxusa com...

Page 2: ...he VU01 cable and sensor cable will not damage the sensor but the instrument and ventilation unit will not function In case of cable replacement or extension beyond 5 metres by the user please note th...

Page 3: ...stallation of VU01 12 5 1 Installation of the ventilation unit 12 5 2 Installation of the sensor 12 5 3 Installation of the VU01 cover 13 5 4 Electrical connection of VU01 14 5 5 Power supply and cabl...

Page 4: ...in seconds t s Rotation rate N 1 min Supply voltage Usupply V Voltage drop over cable Udrop V Fan voltage supply Ufan V Cable resistance Rcable Wire resistance per meter Rewire m Cable length Lcable...

Page 5: ...and SR25 D1 secondary standard pyranometers and IR20 and IR20WS research grade pyrgeometers Ventilation promotes thermal equilibrium between all components of radiometers and thereby reduces zero off...

Page 6: ...tor power is relatively high in order to increase the airflow The heaters should be activated using external relays A fan status signal high low may be used by the user to monitor rotation of the fan...

Page 7: ...are 2 x M5x60 screw 2 x M5 retaining torque nut 4 x 5 x 10 3 m washer spare filter 1 x product certificate any other options as ordered 1 3 Options longer cable in multiples of 5 metres Specify total...

Page 8: ...tem below cover 9 VU01 connector 10 VU01 cable and cable connector Ventilation promotes thermal equilibrium between all components of radiometers and thereby reduces zero offsets Dew and frost formati...

Page 9: ...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 ventil...

Page 10: ...cluding 5 m cable 1 35 kg Packaging box of 330 x 250 x 220 mm VERSIONS OPTIONS ACCESSORIES Longer cable in multiples of 5 metres option code total cable length consult Hukseflux see chapter 5 5 on ins...

Page 11: ...ultra high accuracy measurements the following manual may serve as a reference Baseline Surface Radiation Network BSRN Operations Manual Version 2 1 L J B McArthur April 2005 WCRP 121 WMO TD No 1274...

Page 12: ...nsor mounting plate to the bottom of the sensor using two M5x10 screws See Figure 5 2 1 A T25 torx key to do so is included with VU01 Affix the sensor with the sensor mounting plate to the ventilation...

Page 13: ...ver using thumbscrew 1 Connect the VU01 cable connector to the VU01 connector 4 To remove cover Loosen thumbscrew 1 by turning counterclockwise until the tapered part of the thumbscrew is ejected from...

Page 14: ...and a power supply as short as possible For cable extension see the next paragraph and appendix on this subject Table 5 4 1 The electrical connection of VU01 The heaters and fan status signal are not...

Page 15: ...e ventilator a high cable resistance casuses a high voltage drop VU01 power consumption is 7 8 W at a low voltage 12 VDC The current that is needed 0 66 A causes a significant voltage drop Using a 12...

Page 16: ...V V V V V 1 0 2 0 1 0 1 0 0 0 0 0 0 0 0 5 1 0 5 0 3 0 2 0 1 0 1 0 1 10 1 1 0 7 0 4 0 3 0 2 0 1 15 1 0 0 6 0 4 0 3 0 2 20 0 9 0 5 0 3 0 2 30 0 8 0 5 0 3 40 0 7 0 4 50 0 9 0 5 Examples For a cable leng...

Page 17: ...per minute The signal is 2 5 V When the fan is running too slowly or not at all a low signal US low is provided The fan status signal will only function when VU01 itself is powered Figure 5 6 1 A fan...

Page 18: ...signal between the blue fan status signal and yellow fan status signal wire as shown in Figure 5 6 2 Figure 5 6 2 Wiring diagram required to use VU01 s fan status signal To use the optional status sig...

Page 19: ...shooting Table 6 3 1 Trouble shooting for VU01 PROBLEM SOLUTION Fan and or heaters do not function check wiring for correct connection of and check power supply Fan does not work check for obstructio...

Page 20: ...VU01 manual v1614 20 25...

Page 21: ...ront side the filter retainer Turn the screwdriver 90 to detach the filter retainer from the finger guard Replace the used filter cloth with a fresh filter spare part VU01F Slide the filter retainer u...

Page 22: ...rred specifications for VU01 cable replacement and extension General replacement please order a new cable with connector at Hukseflux or choose a DIY approach In case of DIY replacement by the user se...

Page 23: ...quirements of the following directive 2004 108 EC The Electromagnetic Compatibility Directive hereby declare under our sole responsibility that Product model VU01 Product type Ventilation unit has bee...

Page 24: ......

Page 25: ...2016 Hukseflux Thermal Sensors B V www hukseflux com Hukseflux Thermal Sensors B V reserves the right to change specifications without notice...

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