Silicon sensors for measuring the solar irradiation

The Spektron 210, 320 and 485mb are silicon sensors used for measuring the solar irradiation. A silicon solar cell can be used as an irradiance sensor, because the short-circuit current is proportional to irradiance.

Range of application

  • Output and operational check of thermal and photovoltaic solar plants
  • Controlling of shading equipment on buildings
  • Instruction and training
  • Sensor for control systems

Ease of use

The Spektron can be connected directly to a voltmeter or a datalogger. The voltage measured by the Spektron 210 can be converted into the unit of irradiation (W/m²), using the calibration value imprinted on the sensor.

Robust casing

The Spektron can be used irrespective of the weather conditions and under any angle of inclination.


Spektron 210 Irradiation Sensor

Tritec Spektron 210 Silicon Sensors

The irradiation sensor Spektron 210 provides the possibilities of evaluating irradiation between 0 and 1500 W/m2 and a voltage proportionally to the in- tensity of the solar irradiation. Besides, the voltage measured can be converted into the unit of irradiation (W/m2), using the calibration value imprinted on the sensor.


Spektron 320 Irradiation Sensor

Tritec Spektron 320 Silicon Sensors

This irradiation sensor Spektron 320 provides the following possibilities for the evaluation of irradiation between 0 and 1500 W/m2: Voltage output 0 – 150 mV, Voltage output 0 – 3.125 V, Voltage output 0 – 10 V and current output for two-wire technology 4 – 20 mA. The maximum measurable irradiation amounts to 1500 W/m2. Only one measuring output can be used at a time.


SPEKTRON 485mb Digital Irradiation Sensor SI-RS485

Spektron 485mb Digital Irradiation Sensor Si Rs485

Our Spektron 485mb digital irradiation sensor are build out of a monocrystalline solar cell connected to a shunt. Due to the low resistance of the shunt, the cell operates next to short circuit. The temperature coefficient of the short-circuit current creates a small error. Therefore all of our silicon sensors with the extension „TC“ have an active temperature compensation, which reduces this error by factor 20. The compensation is realized by using a specific temperature sensor laminated to the rear side of the solar cell. The measuring signals of short-circuit current of the cell and the resistance value of the temperature sensor are measured by a microcontroller. The calculated values of irradiance and temperature are given onto a RS485 port with customer specification protocol. The electronic circuit is optimised for low power consumption. All sensors are calibrated in simulated sunlight against a reference cell of the same type. The reference cell is periodically calibrated against a reference cell calibrated by Fraunhofer ISE, Freiburg.


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