CMP21 Pyranometer to measure solar irradiance

Detector and calibration

CMP21 has the same detector as the CMP11 and individually optimised temperature compensation. A thermistor sensor is installed to monitor the housing temperature. Each instrument is supplied with its own temperature and directional (cosine response) test data.

Applications

It is the choice for scientific use and for high-grade solar radiation monitoring networks such as the Baseline Surface Radiation Network of the WMO.

Construction

A waterproof socket is fitted for the signature yellow signal cable, which is available in a range of lengths pre-wired to the waterproof plug. The integral bubble level is raised to the top of the housing and can be viewed without removing the redesigned snap-on sun shield, which also covers the connector. The screw-in drying cartridge is easy to remove and the replacement desiccant is supplied in convenient refill packets.

Output

The pyranometer does not require any power; it supplies a low voltage of 0 to 20 mV in relation to the amount of incoming radiation. When a higher voltage level or a 4 to 20 mA signal is required, the AMPBOX is the perfect solution.

Accessories

AMPBOX — boosts the pyranometer's output signal.

Ventilation unit — maintains the pyranometer temperature and prevents dew, dust, frost and snow build-up.

Mounting plate (unventilated) — one or two (albedometer) pyranometers can be mounted.

Mounting plate (ventilated) — one or two (albedometer) pyranometers with ventilation units can be mounted.

Mounting brackets — for fixing the mounting plate to the appropriate wall or pole.