SRA01
2Pages

Catalog excerpts

Thermal Sensors Second class albedometer SRA01 albedometer is an instrument that measures global and reflected solar radiation and the solar albedo, or solar reflectance. It is composed of two identical second class pyranometers with thermopile sensors, the upfacing one measuring global solar radiation, the downfacing one measuring reflected solar radiation. SRA01 complies with the latest ISO and WMO standards. Introduction Albedo, also called solar reflectance, is defined as the ratio of the reflected to the global radiation. The solar albedo depends on the directional distribution of incoming radiation and on surface properties at ground level. Albedos of typical surfaces range from about 4 % for fresh asphalt, and 15 % for green grass to 90 % for fresh snow. Using SRA01 is easy. The albedometer is composed of two pyranometers, the upfacing one measuring global solar radiation, the downfacing one measuring reflected solar radiation. The irradiance in W/m2 in each direction is calculated by dividing the pyranometer output, a small voltage, by the sensitivity. The sensitivity of both pyranometers, model SR01, is provided on the SRA01 product certificate. The working principle and specifications of the pyranometers can be found in the SRA01 manual. SRA01 can be connected directly to commonly used datalogging systems. Figure 1 SRA01 second class albedometer Albedometers are used for general meteorological observations, building physics, roof reflectance studies, climate studies and solar collector testing. A common application is for outdoor solar radiation measurements as part of a meteorological station. This application requires horizontal levelling; a bubble level is included. SRA01 is designed to fit a ¾ inch NPS mounting tube. Figure 2 overview of SRA01: (1) upfacing pyranometer body, (2) glass dome, (3) thermal sensor with black coating, (4) bubble level, (5) cable gland, (6) cable, (7) albedometer body, (8) glass dome, (9) downfacing pyranometer body The uncertainty of a measurement under outdoor conditions depends on many factors. Guidelines for uncertainty evaluation according to the “Guide to Expression of Uncertainty in Measurement” (GUM) are found in our manuals. We provide spreadsheets to assist in the process of uncertainty evaluation of your measurement. Copyright by Hukseflux. Version 2007. We reserve the right to change specifications without prior notice Page 1/2. For Hukseflux Thermal Sensors go to www.hukseflux.com or e-mail us: info@hukseflux.c

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Thermal Sensors SRA01 design SRA01 consists of two identical pyranometers model SR01, one facing up, one facing down. The albedometer body is designed to fit a ¾ inch NPS tube for mounting purposes. The cable can be led away through the tube (the tube’s recommended outer diameter is < 28 x 10-3 m, the inner diameter > 20 x 10-3 m). Such a mounting tube is not part of the delivery. SRA01 can be ordered with longer cable and optional sun screens. Optional measurand Optional measurand Included sensors Mounting Calibration uncertainty Calibration traceability Measurement range Spectral range...

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SRA01 2Pages

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SRA01
2Pages