IllI zoniEiu PC-BASED POSITIONING OPERATIONS Accuracy suitable for any requirement All-weather construction Unattended operation Virtually maintenance-free Wide range of mounting configurations Ideal for BSRN stations

Introduction Solar radiation is normally measured using a pyranometer that sees the whole hemisphere above it and responds to radiation from both sun and sky, the ‘global’ solar radiation. However, it is often necessary to accurately measure the ‘direct’ radiation coming only from the sun. A pyrheliometer has a 5 ° view, slightly larger than the sun and its aureole, and does not see the rest of the sky. To make measurements it must point precisely at the sun and this is achieved using an automatic two-axis sun tracker. A shading assembly blocks the direct solar radiation from reaching a pyranometer...

SOLYS 2 is an advance over conventional automatic sun trackers. It does not require a computer and software for installation. The integrated GPS receiver automatically congures location and time data. Multi-colour LEDs indicate the operating status and an Ethernet port allows for software upgrades, testing and fault diagnosis. The high-efciency belt drive system requires no maintenance. The tough and distinctive cast aluminium housing has a matching tripod stand with levelling feet. A side plate with mountings for a Kipp & Zonen pyrheliometer is included as standard and a second side plate can...

Pointing accuracy < 0.1 ° passive tracking < 0.02 ° active tracking (with optional sun sensor) < 0.1 ° passive tracking < 0.02 ° active tracking (with optional sun sensor) > 20 Nm (at maximum load and angular velocity) * > 23 Nm (when sun tracking) * > 40 Nm (at maximum load and angular velocity) > 40 Nm (when sun tracking) Payload (balanced) Angular velocity Angular acceleration Supply voltage Power heater 100 W (heater is standard, AC only) Operating temperature range 0 °C to +50 °C -20 °C to +50 °C with optional cold cover -50 °C to +50 °C with optional cold cover and optional heater 23 kg...