Starparanometer

introduction

The star pyranometer was developed in the present form of Dirmhirn. It ranks within the meteorological radiation meters to the group of "black and white surfaces pyranometer" and serves to detect the global radiation, the sky radiation, the shortwave reflected radiation and shortwave radiation on differently oriented and inclined surfaces. Global radiation is the. From the upper half on a horizontal surface incident radiation in the wavelength range of the solar spectrum of 0.3 to 3? M, and is the sum of direct solar radiation and diffuse sky The radiation intensity is not measured directly, but via the detour of a produced by them temperature difference at the pyranometers. The electrical Pyranometers this difference is converted by means of thermocouple into a proportional electromotive force. In the manner, the complicated measurement of a radiation current is attributed to the ease of an electrical voltage. The important in environmental research measure "global radiation" must be determined under a variety of weather conditions, so that only a correspondingly robust and corrosion-resistant design of the instrument trouble-free operation guaranteed.

description

The radiation-sensitive surface of Sternpyranometers represent 12 circularly arranged, alternately black and white painted copper plate. When exposed to warm the black over the white. This temperature difference is detected with the attached to the underside of surfaces thermopile. The voltage developed by it is approximately 15? V / Wm-2 at an internal resistance of about 35 ohms. To protect the receiver surface is a glass dome of polished optical "SCHOTT" glass is provided which is connected by two sealing rings and a ring nut tight against the housing. A dry container with silica gel prevents condensation phenomena inside the unit. A white painted metal housing protects the dryer vessel and prevents overheating of the instrument. The embodiment of the connecting cable is connected via a water-tight fitting, whereby the interior is finished well against the ambient air. For the leveling of the appliance, the three set screws on the housing plates and a dragonfly are provided.

maintenance

The glass domes of Sternpyranometern that are in continuous use, to at least once per day clean- and wiped dry. Ice covering must be removed very carefully, possibly de-icing spray use. For measurements during the winter months a ventilating and heating of the device is fitted to prevent fogging of the glass by precipitation in solid or liquid form. This is best done the "vent housing model no. 8106" at. The horizontal installation is to be checked daily if possible. The receiver surfaces must always be black and white. Should occur at the receiver surfaces irregularities or other defects, so a review of our work is inevitable. A scratching both the receiver surfaces as well as the glass dome is to be avoided. is the screw-drying container whose filling consists of silica gel on the underside of Sternpyranometers. This dry matter must always be red. If the substance is pale, it must be changed. If no new filling is available, the substance can be reactivated at a temperature of 80 ° C.

calibration

Pyranometer in continuous use at least every 2 years should be calibrated, it is recommended an annual calibration. During this calibration, the necessary annual seal replacement is performed. The supplier performs this service work like by for you.

Options, spare parts

• Ventilation housing model 8106 for the ventilation and heating of Sternpyranometers to allow fogging of the dome in cold and cooling in warm weather
• glass dome
• 1 set of seals (3 pieces)
• Silica gel container with filling