The CNR4 net radiometer integrated 4 solar sensors into a single instrument body. The CNR4 consists of a pair of pyranometers and a pair of pyrgeometers. Each pair has one facing upwards for incoming radiation and one facing downwards for the outgoing radiation. The CNR4 has four separate output signals from the sensors, plus integrated temperature outputs. The signal outputs represent the incoming and outgoing short-wave (Solar) and long-wave (atmospheric and terrestrial) radiation, whilst the temperature reading can be used to compensate the pyrgeometer output. Units are supplied with a screw-in mounting rod for fitting to a mast and poles, bubble level and two 8-pin connector ports. An optional heated ventilation unit, the CNF4, is available to minimise offsets, maximise stability and remove precipitation, frost and snow.
The CNR 4 net radiometer consists of a pyranometer pair, one facing upward, the other facing downward, and a pyrgeometer pair in a similar configuration. The pyranometer pair measures the short-wave radiation. And the pyrgeometer pair measures long-wave radiation. The upper long-wave detector of CNR 4 has a meniscus dome. This ensures that water droplets role off easily and improves the field of view to nearly 180°, compared with a 150° for a flat window. All 4 sensors are integrated directly into the instrument body, instead of separate modules mounted onto the housing. Each sensor is calibrated individually for optimal accuracy.
Two temperature sensors, a PT100 and Thermistor, are integrated and used to provide information to correct the pygeometer’s infrared readings for the temperature of the instrument housing. Care has been taken to place the long-wave sensors close to each other and close to the temperature sensors. This assures that the temperatures of the measurement surfaces are the same and accurately known. The accuracy of both sensors is the same and selection depends on which will connect to the data logger or data acquisition system.
The CNR 4 has 2 8-pin connector ports. The connector with the 4 sensor outputs is indicated with an S, the temperature connector is indicated with a T. Both ports have 8 pins but the temperature connector only uses 6, two for the thermistor and four for the 4-wire PT100 outputs.
Diagram
Specification
| Spectral range (Short wave): | 300 to 2800nm |
| Spectral range (Long Wave): | 4500 to 42000nm |
| Sensitivity: | 5 to 20µV/W/m² |
| Temperature dependence of sensitivity: | < 4% (-10 to +40ºC) |
| Response time: | < 18s |
| Non-linearity: | < 1% |
| Operating temperature: | -40 to 80°C |
| International standards (WMO): | Good Quality WMO |
| Ventilation power (optional CNF4): |
10 Watts @ 12vDC |
To improve the measurement accuracy of the CNR4, a CNF4 ventilation unit can be fitted. The CNF4 provides a clean air flow over all four of the CNR4 radiometer domes and windows and it can be used outdoors under all weather conditions. A built-in heater keeps the air just above ambient temperature which helps disperse precipitation and melt frost, or even melt snow and ice in cold climates.
0369900-030
£6,022.00
0369900-032
£6,266.00
0369700-000
£1,306.00
0369700-002
£1,428.00
0369701
£304.00
Need help with your products or have a question for us on our custom systems? Use the form below to send us a message and our experts will be in touch to help.
