Analog Solar Radiation Sensor – Litemeter Current PRO

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Litemeter Current Pro is an analog solar radiation sensor (solarimeter) equipped with a monocrystalline silicon cell for high efficiency, and temperature compensated output. Manufacturing and Calibrations are done following the IEC 61215, IEC 60904-2; 60904-4; 60904-10 regulations. This photovoltaic pyranometer is the glass-laminated version of the Litemeter Current sensor. The cell is laminated with a high performance anti-reflective glass for photovoltaic modules and E.V.A. The current output 4-20mA allows the analog signal to remain unchanged in cases whereas the distance between the sensor and the control unit is 10m and more, or in disturbed areas. Distance up to 20-35m are attainable if there’s no signal interference.
Note: the terms solarimeter, irradiance sensor, pyranometer and calibrated cell are interchangeable. On this site we will use irradiance sensor. To learn more click here.


Each Litemeter LM1-420 PRO is calibrated for comparison with our Silicon Reference Cell calibrated periodically by Fraunhofer ISE Institute (DE) and a HP34410A Multimeter

Key features

  • Output 4-20 mA
  • Anodized aluminum housing for high durability
  • Anti-reflective glass with E.V.A.
  • Temperature compensated signal
  • Error tolerance of 3.5%
  • Calibrated for comparison with our Silicon Reference Cell calibrated periodically by Fraunhofer ISE Institute (DE) and a HP34410A Multimeter
  • Complies with IEC 60904
  • Mounting bracket for easy installation.
  • Easy to use
  • IEC EN 61215 par.10,11,12 compliant – (aging)

Common uses

Although it is usually employed in smaller PV systems, thanks to its high EMC immunity, Litemeter Current Pro can also be used in larger photovoltaic systems.


PRODUCT LM1-420 PRO monocrystalline silicon cell solar irradiance sensor (solarimeter)
STANDARD REFERENCES IEC 60904-2; 60904-4; 60904-10;
Input range Irradiance 0 ÷ 1250 W/m2
Output signal Current 4÷20mA (max output: 25mA)
Output precision Irradiance ± 3.5% temperature compensated
Working temperature -25 ÷ +80°C
Response time < 100 milliseconds
Sensor type Temperature compensated solarimeter
Supply External current loop 12 ÷ 30 V DC
Encapsulant Glass + E.V.A. + Poliester
Cable 50cm, UV and high temperature resistant cable
Connects Female 3 pin (IP67 degree)
Dimensions 55x98x20.5mm without bracket
IP protection grade IP 65


Protection against lightening

Protects irradiance sensors and photovoltaic monitoring equipment from lightening induced overvoltages. Discover Blitz-Wall!


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