HD9906_51_1
HD9906_51_2

HD 9906.51 – Heating and Ventilation Unit

The heating and ventilation unit HD 9906.51 is meant to be used with solar radiation
sensors (pyranometer, pyrgeometer and radiometer) and can be used outdoor under
any weather conditions.
The ventilation of the instruments increases the precision of the measures by making
the pyranometer’s temperature uniform, in particular it avoids the deposit of dew and
frost on the optical parts of the sensors and reduces the off-set of type A (present in
pyranometers and pyrgeometers) caused by the cooling of the dome with respect to
the instrument’s body.

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Product Description

The heating and ventilation unit HD 9906.51 is meant to be used with solar radiation
sensors (pyranometer, pyrgeometer and radiometer) and can be used outdoor under
any weather conditions.
The ventilation of the instruments increases the precision of the measures by making
the pyranometer’s temperature uniform, in particular it avoids the deposit of dew and
frost on the optical parts of the sensors and reduces the off-set of type A (present in
pyranometers and pyrgeometers) caused by the cooling of the dome with respect to
the instrument’s body.
It is possible to use the heating under extreme environmental conditions so to
prevent ice formation on the dome of the pyranometer (when the heating is on, you
should consider that the off-set of type A may increase, therefore we suggest the
use of the heating only for the time necessary to remove snow or ice formed on the
instrument’s surface).
The HD 9906.51 unit can be used with LP PYRA 02 and LP PYRA 10, with the
pyrgeometer LP PIRG 01 and the radiometers LP PHOT 02, LP UVA 02 and LP UVB 02.
Installation and assembly of the ventilation unit
In order to install the pyranometer on the ventilation unit, it is necessary to work
under the following procedure:
1. Loosen the three nuts that hold the bell
2. Remove the HD 9906.51 bell
3. Remove the white screen by the pyranometer
4. Remove the adjusting screws from the body of the pyranometer (if necessary,
leveling will be performed by adjusting the screws on the HD 9906.51.)
5. Fix the pyranometer to the ventilation unit by using the two M5 screws
6. Make sure that the cable of the pyranometer has been properly connected
7. Reassemble the HD 9906.51 bell into place and tighten the screws

The pyranometer is fixed to ventilation unit by 2 set screws M5x50. To allow an
accurate reading of ground solar radiation is necessary place the HD 9906.51
parallel to the ground, this can be done using the bubble on the ventilation unit.
The electrical connections of the HD 9906.51 happen are located under the base.
There are two pairs of terminals. A pair for ventilation and a pair for heating.
The polarity of the fan must be respected, otherwise the flow of air is in the opposite
direction to that expected (from bottom to top).

The supplies required are:
For heating is required 12V DC (6W)
For the fan is required 12V DC (5W)
The fan model is: EBMPAPST 4312V (IP 54 protection and capacity of 170m3/h), is
equipped with a filter (EBMPAPST: PMFA 12OT) that must be periodically checked
and replaced if dirty.
Specifications
Power supply : fan 12V DC (5W)
heating 12V DC (6W)
Working temperature: -30 °C ÷ 70 °C

 

 

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Manuals and Brochures here.  

HD9906_51.pdf

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