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Fluke FLK-IRR1-SOL Solar Irradiance Meter
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Product overview: Fluke FLK-IRR1-SOL Solar Irradiance Meter

If you’re surveying, installing, executing maintenance or checking performance of solar panels or a photovoltaic system, the Fluke IRR1-SOL Irradiance Meter gives you the 4 critical measurements needed all in one easy-to-use tool. Make instantaneous measurements to determine the watt per square meter solar irradiation, required by IEC 62446-1 standard. Measure temperature by either placing the meter directly on the panel or by connecting the external probe. Find cardinal direction with the compass, and verify inclination of a roof or panel with the tilit function. Get all the critical photovoltaic measurements needed to install, verify and report on the performance of a photovoltaic system in one instrument.

  • Measure solar irradiance, ambient and PV module temperature, array orientation and tilt angles
  • Make instantaneous measurements to determine the watts per square meter solar irradiation, required by IEC 62446-1 standard
  • High contrast LCD with large numbers for easy readability in direct sunlight
  • Includes convenient carry case with shoulder strap

Specifications: Fluke FLK-IRR1-SOL Solar Irradiance Meter

Measuring Range 0 to 1400 W/m²
Resolution 1 W/m²
Measuring Accuracy ± (5 % + 5 Digit)
Temperature Measurement
Measuring range (°C) -22 °F to 212 °F (-30 °C to 100 °C)
Resolution 0.2 °F (0.1 °C) / 1 °F @>100 °F
Measuring Accuracy ±2 °F (±1 °C) @ 14 °F to 167 °F (-10 °C to 75 °C),
±4 °F (±2 °C) @ -22 °F to 14 °F (-30 °C to -10 °C) and 167 °F to 212 °F (75 °C to 100 °C)
Note: Temperature measurement response time: ~30 sec.
Inclination Angle
Measuring Range -90° to +90°
Resolution 0.1°
Measuring Accuracy ± 1.5°@ -50° to +50°, ±2.5° @ -85° to -50° and +50° to +85°, ±3.5° @ -90° to -85° and +85° to +90°
Measuring Range 0° to 360°
Measuring Accuracy ±7°
a) Measurements valid for device inclination between -20° and +20° to horizontal. Outside that range on LCD will be shown "---".
b) Result is referred to magnetic north. 
Operating Temperature IRR1-SOL -20 °C to 50 °C (humidity <80%), noncondensing
Operating Temperature 80PR-IRR -30 °C to +100 °C
Storage Temperature -30 °C to 60 °C (humidity <80%)
Altitude 0 m to max. 2000 m
Electromagnetic Compatibility (EMC)
International IEC 61326-1: Portable Electromagnetic Environment
CISPR 11: Group 1, Class A
Group 1: Equipment has intentionally generated and/or uses conductively-coupled radio frequency energy that is necessary for radio frequency energy that is necessary for the internal function of the equipment itself. Class A: Equipment is suitable for use in all establishments other than domestic and those directly connected to a low voltage power supply network that supplies buildings used for domestic purposes. There may be potential difficulties in ensuring electromagnetic compatibility in other environments due to conducted and radiated disturbances.
Caution: This equipment is not intended for use in residential environments and may not provide adequate protection to radio reception in such environments.
Korea (KCC) Class A Equipment (Industrial Broadcasting & Communication Equipment)
Class A: Equipment meets requirements for industrial electromagnetic wave equipment and the seller or user should take notice of it. This equipment is intended for use in business environments and not to be used in homes.
USA (FCC) 47 CFR 15 subpart B. This product is considered an exempt device per clause 15.103.
IP Protection IP40
Power Supply & Battery Life
Batteries 4 AA Alkaline Batteries
Battery Life (typical) 50 hours (≤9000 readings)
Auto Power Off 30 minutes
L x W x H 5.90 x 3.14 x 1.37 in (150 x 80 x 35 mm)
Weight 0.5 lb (231 g)

Fluke FLK-IRR1-SOL Solar Irradiance Meter


  • Solar Irradiance Meter
  • External Temperature Probe with Suction Cup
  • Carrying Case with Sholder Strap
  • 4 x AA Batteries

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Data Sheets