Features
• Measurement of solar radiation and temperature.
• The LoRa interface for communication with a master meter – offers a larger range
than the Bluetooth technology!
• Automatic data synchronization with a master meter with reSYNC function.
• Built-in compass and inclination sensor.
• Built-in recorder that can be used to record solar radiation before constructing PV
systems, as well as to measure the shading of existing systems.
• Large measurement memory: 999 cache memory cells and 5000 recorder records
available (one-time recording) with the option of overwriting them (continuous
recording).
Simple and compact
in PV measurements
Solar radiation and temperature meter
IRM-1
Measured parameters
• Solar radiation intensity (irradiance) in W/m2 or BTU/ft2h.
• PV panel temperature in °C or °F.
• Ambient temperature in °C or °F.
• Inclination angle of panels
• Orientation of the panels with the built-in compass.
Simple and compact
IRM-1, small, but indispensable for testing PV systems. By measuring solar radiation
values, as well as panel and ambient temperatures, it provides the necessary data to
convert the results into STC conditions. A built-in recorder with a memory of 5000 records
enables the instrument to be used as a tool in the PV plant design process, as well
as to diagnose panel shading problems.

Tightness and durability
The meter performs well in harsh environmental conditions. Protection against the ingress
of dust and water is provided by the housing rated at IP65. This is especially
important for measurements on photovoltaic systems, which are outdoor installations.
Communication and software
Measurement data from the IRM-1 can be transferred to a computer via the USB port.
In addition, the device has a built-in wireless LoRa interface (Long Range) for automatic
data exchange with the master meter – even over long distances.

Specifications
Parameter Measurement
range
Display
range Resolution Accuracy
±(% m.v. + digits)
Irradiance
Measurement in W/m2 100 W/m2…1400 W/m2 0 W/m2…1400 W/m2 1 W/m2 ±(5% m.v. + 2 digits)
Measurement in BTU/ft2h 32 BTU/ft2h…444 BTU/ft2h 0 BTU/ft2h…444 BTU/ft2h 1 BTU/ft2h ±(5% m.v. + 2 digits)
PV and ambient temperature
Measurement in °C -20.0°C…100.0°C -20.0°C…100.0°C 0.1°C ±(1% m.v. + 5 digits)
Measurement in °F -4.0°F…212.0°F -4.0°F…212.0°F 0.1°F ±(1% m.v. + 5 digits)
Inclination angle -90°…+90° -90°…+90° 1° ±4°
Position direction – compass 0°…360° 0°…360° 1° ±7°
Safety and work conditions
Ingress protection IP65
Power supply Li-Ion 3.7 V 1.3 Ah rechargeable battery
Dimensions 134 x 79 x 28 mm
Weight ca. 0.2 kg
Operating temperature -10…+50°C
Storage temperature -20…+60°C
Humidity 20…80%
Nominal temperature 23 ± 2°C
Reference humidity 40%…60%
Memory and communication
Memory of measurement results user measurement memory: 999 records
recorder: 5000 records
Data transmission USB
Communication with a master meter LoRa
Other information
Quality standard – development, design and production IEC 61010-1
The product meets the EMC (emission for industrial
environment) requirements according to standards
IEC 61326-1