Introduction
Net radiometers are instruments used to measure the energy balance between incoming and outgoing radiation. They are crucial in fields like agro-meteorology, climatology, and hydrology, particularly for studying evapotranspiration and global warming effects on glaciers and ice fields.

Types of Net Radiometers
1. One-component Instruments: NR Lite2 is a single-component net radiometer that measures total net radiation using a thermopile detector with a wide spectral response. It is commonly used in agriculture and hydrology.
2. Four-component Instruments: CNR 4 is a four-component net radiometer that measures incoming and reflected solar radiation, as well as downward and upward infrared radiation. It combines two pyranometers and two pyrgeometers, providing separate outputs for each component.

Specifications and Features
- CNR 4: Includes a screw-in mounting rod, bubble level, and waterproof connectors. It has a unique ventilation system to minimize offsets and maximize stability. The optional CNF 4 ventilation unit can be added for enhanced performance.
- NR Lite2: Features a single output, integral mounting rod, and a bird prevention stick. It is lightweight and portable, suitable for use with automatic weather stations.

Accessories
- CNF 4 Ventilation Unit: Provides clean airflow over the radiometer domes and windows, with a 10 W heater to prevent dew and frost formation.
- CMB 1 Mounting Bracket: Allows attachment to poles, masts, or walls, with adjustable leveling.

Technical Specifications
- CNR 4: Operating temperature from -40 °C to +80 °C, spectral range of 300 to 2800 nm for short-wave and 4.5 to 42 µm for long-wave radiation, with four signal outputs.
- NR Lite2: Operating temperature from -40 °C to +80 °C, spectral range of 200 nm to 100 µm, with a single signal output.

Conclusion
Kipp & Zonen offers a range of net radiometers suitable for various applications, ensuring reliable and accurate measurements of radiation balance. The choice between NR Lite2 and CNR 4 depends on the specific measurement needs and application requirements.