SEVEN - Model 3S-IS-T-V -Irradiance Sensor With 0-1,5V Output

WORKING PRINCIPLES

A silicon solar cell can be used as an irradiance sensor, because the short-circuit current is proportional to irradiance. Our sensors are built 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. The compensation is realized by using a 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 micro controller. The calculated values of irradiance and temperature given onto a 0-1,5V protocol. The electronic circuit is optimized for low power consumption.

CONSTRUCTION FEATURES

Monocrystalline Cell: The cell is laminated with 2 EVA sheets, one Tedlar sheet and 3mm tempered glass under 180 °C homogeneous temperature and under vacuum effect. The size of the monocrystalline cell is 52×52 mm² or 31x31mm².

Sensor Box: It is an UV protected aluminum box. The sensor box has two opening access and the mounting holes on its sides are for easy site installation. There are three options for IP Class; IP54, IP65 and IP68. For ventilation purpose, there are 1mm holes at bottom side of the box, or a ventilation plug on its side.

TECHNICAL DATA

• Item Code: 3S-IS-T-V
• Reference Cell: Monocrystalline Silicon (31 mm x 31 mm)
• Current Shunt: High precision shunt resistor directly soldered to the terminals of the cell
• Irradiance Range: 0 – 1500 W/m²
• Uncertainty: ≤1,2%; as per IEC61724-1 standard Class A
• Resolution: 0.1 W/m² ≤ 1W/m²; as per IEC61724-1 standard Class A
• Response Time: 1 sec. less than 3 sec; as per IEC61724-1 standard Class A
• Drift: Very small drift of <0.3%/ year
• Field of View: Larger than 160° as per IEC61724-1 standard Class A
• Tilt-Azimuthal Angle: 0°- 0° , ≤ 1°; as per IEC61724-1 standard Class A
• Output Rate: 1/s
• Data Output: Analog 0-1,5 V
• Power Supply: 12 to 30 V DC
• Power Consumption: 15 mA max @24 VDC
• Electrical Connection: 3 m LIYYC11Y PUR Cable, UV and Weather Resistant
• Cell Temperature Sensor Type: PT1000 Class A as per EN 60751
• Operating Temperature Range: -40°C to +85°C
• Operating Humidity Range: 0 to 100 %
  
• Box Dimensions: 140 mm x 110 mm x 42 mm (W x L x H)
  
• Weight: 0.3 kg
  
• IP Rating: IP54 (IP65, IP68 options)
  
• Sensor Housing Material: Aluminum
  
• Compliant Standard: IEC 61724-1:2021 and IEC 60904
  
• Calibration: Each sensor is calibrated under Class AAA Sun Simulator as per IEC 60904-2 and IEC 60904-4 by using a reference cell calibrated by ISFH-Germany
  
• Test: The test is carried under natural sunlight by using a calibrated reference cell from Fraunhofer ISE, Germany