Albedo Stra-Pyranometer

The double pyranometer used to determine the reflectivity ( "albedo") of the base percentage. It also allows for the calculation of short-wave radiation balance.

Two complete star pyranometer are offset by 180 °, mounted on a connecting ring and provided with fasteners. For installation on a base two holes are provided.

Measuring Principle

The upward star pyranometer measures the global radiation G, which points to the ground star pyranometer measures the shortwave reflected radiation R.

Albedo A indicates the amount of reflection on a surface in percent and can as calculated follows

are: A = (R 100). / G

The short-wave radiation balance KS calculated (the available short-wave radiation on a horizontal surface)

as follows: KS = G - R (Joule, Watt)

Assembly

For fixing two holes are provided on the handle. The Doppelpyranometer can both horizontally (by means of a spirit level) and mounted parallel to a reference surface are.

Color code the outputs:

Page 1: green - white

Cable: green + (pos.), White - (neg.)

Page 2: yellow - brown

Cable: yellow + (pos.), Brown - (neg.)

introduction

The double pyranometer  was developed in the present form of Dirmhirn. It ranks within the meteorological radiation meters to the group "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 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 and diffuse solar radiation 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 surfaces of double pyranometer each provide 12 circularly arranged, alternately black and white painted copper plate. In radiation 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 faces a glass dome of polished optical "SCHOTT" glass each is provided which is connected by two sealing rings and a ring nut tight against the housing.

Two outside screwed dry container with silica gel prevent condensation phenomena inside the unit.

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 a dragonfly is provided.

maintenance

The glass domes of pyranometers that are in continuous use, should if possible clean- least once a day and be wiped dry. Ice covering must be removed very carefully, possibly de-icing spray use. The installation should 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. are screw-drying tank whose filling consists of silica gel on the housing side of Doppelpyranometers. 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. The supplier performs the calibration by like for you.

Options, spare parts

• Glass dome 
• 1 set of seals (6 pieces) 
• Silica gel container with filling 

Doppelpyranometer to determine the reflectivity ( "albedo") of the base percentage. It also allows for the calculation of short-wave radiation balance.

"First class" 9060 world possible as a leader in long-term use regardless of ambient temperatures, year-round measurement according to WMO and ISO.

The measuring principle of double pyranometer based on a differential temperature measurement between white and black areas. Characterized an influencing is avoided by the ambient temperature. Environmental influences are shielded by two ground precision glass domes of the sensor surfaces. Two dry container to prevent condensation. The horizontal mounting is facilitated by a built-in bubble. Each unit is supplied with a calibration certificate.