• new and innovative sensor technology
  • resistant to soiling
  • internal data logging with web access
  • extremely low maintenance
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RaZON+ is an all-in-one system that accurately measures both direct normal irradiance (DNI) and diffuse horizontal irradiance (DHI) from the sun and sky, enabling it to provide very reliable values of global horizontal solar irradiance (GHI) and sunshine duration.

The integrated data logger presents the irradiance measurements in W/m2, sunshine duration in hours and energy in kWh/m2 (kilowatt-hours per square meter).

Included sensors

RaZON+ includes two Smart irradiance sensors; a pyrheliometer (PH1) to measure DNI and a shaded pyranometer (PR1) to measure DHI. The innovative features of the pyrheliometer minimize the effects of soiling when operated unattended in remote locations, without compromising the high accuracy of the instrument. Both the pyrheliometer and pyranometer are based on quartz diffuser technology.

RaZON+ measures DNI and DHI and calculates GHI, as this minimizes uncertainty in the pyranometer readings and provides a more accurate and reliable measurement than using an unshaded pyranometer to measure GHI.

Anti-soiling & low maintenance

Thanks to the open collimator tube design and the quartz diffuser, the pyrheliometer is resistant to the effects of soiling. Moreover, RaZON+ is based on a completely maintenance-free gear drive sun tracking mechanism.

Internal data logging with web access

RaZON+ comes with internal data logging of all parameters in one data set. Choose either the Ethernet or RS-485 interfaces (Modbus® RTU or ASCII) to download your data.

The data is presented in a complete interface with data, graphs and status information.

Expand RaZON+ with additional sensors

An extra Modbus® input is fitted, which will allow additional sensors to be connected with future updates; for example PV panel temperature, tilted irradiance or a compact weather station.

Sun Tracker Comparison

OTT HydroMet offers three different models under its trusted brand Kipp & Zonen. The RaZON+, the SOLYS2, and the SOLYS Gear Drive. Read how to choose the right sun tracker model for your purpose on the OTT HydroMet Blog.

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Pointing accuracy 0.2°
Supply voltage DC 24 V
Power consumption 13 W
Operating temperature -20 to +50 °C °C
Ingress protection IP 65
Transmission Gear drives
Communication interface RS-485 Modbus® for external sensor/system, RS-485 to host, Modbus® or ASCII, Ethernet RJ-45
Batteries Standard
Data logging 1 minute average



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