CNR4 Net Radiometer

Quick Overview

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.

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Details

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.

Availability: Stock Item

Components / Downloads

For further information, technical advice, or a quotation please call or email us. If you are not sure which product you need one of our technical sales advisors will be happy to discuss your application. We also accept company purchase orders by fax or post. Credit card orders can also be placed over the phone for any product.

REF	DESCRIPTION	DOWNLOADS	PRICE	ORDER ITEM

CNR 4 Net Radiometer
0369900-030	CNR 4 Net Radiometer with 4 separate millivolt outputs for incoming and reflected short-wave radiation and downward and upward long-wave radiation. The unit consists of a pyranometer and pygeometer on both sides. Spectral range 300 to 2800nm (short-wave) and 4.5 to 42µm (long-wave), response time less than 18 sec (95%), non-linearity less than 1% (over full range), sensitivity 7 to 20µV/Wm² (short-wave) and sensitivity 5 to 10µV/Wm² (long-wave). Units are supplied with a screw-in mounting rod for fitting to a mast and poles and built-in bubble level. Supplied with no plugs or cables.	Datasheet Size: (489.4 KB)	£5,790.00	or call us for a quote
0369900-032	CNR 4 Net Radiometer with 4 separate millivolt outputs for incoming and reflected short-wave radiation and downward and upward long-wave radiation. The unit consists of a pyranometer and pygeometer on both sides. Spectral range 300 to 2800nm (short-wave) and 4.5 to 42µm (long-wave), response time less than 18 sec (95%), non-linearity less than 1% (over full range), sensitivity 7 to 20µV/Wm² (short-wave) and sensitivity 5 to 10µV/Wm² (long-wave). Units are supplied with a screw-in mounting rod for fitting to a mast and poles and built-in bubble level. Supplied with waterproof 8-pin plug connector with 10m of pre-wired yellow signal cable.		£5,928.00	or call us for a quote

CNF 4 Ventilation Unit
0369700-000	CNF 4 Ventilation Unit. Specifically designed for the CNR 4 net radiometer to provide clean air-flow over all four domes and windows to minimise the formation of dew and reduce the frequency of dome cleaning. The built-in 10W heater will melt frost. Reduces frequency of dome cleaning. Minimises offsets and improves stability. Replaceable fan inlet filter. Power supply 12vDC @ 1.3A. Supplied with no plugs or cables.		£1,255.00	or call us for a quote
0369700-002	CNF 4 Ventilation Unit. Specifically designed for the CNR 4 net radiometer to provide clean air-flow over all four domes and windows to minimise the formation of dew and reduce the frequency of dome cleaning. The built-in 10W heater will melt frost. Reduces frequency of dome cleaning. Minimises offsets and improves stability. Replaceable fan inlet filter. Power supply 12vDC @ 1.3A. Supplied with waterproof 4-pin plug connector with 10m of pre-wired yellow signal cable.		£1,442.00	or call us for a quote

Mounting Options
0369701	CMB 1 Mounting Bracket. This bracket is suitable for various mounting rod sizes, from 12mm to 20mm diameter, and can be secured via u-bolts to masts or poles from 22mm up to 60mm diameter. The bracket can also be secured directly to a wall, or other flat surface.		£292.00	or call us for a quote