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CNR4 Net Radiometer

2.4.1 CNF4 Specifications

Heater

Power consumption:

10 W @ 12 Vdc (15 Ω)

Ventilator

Power consumption:

Supply voltage:

5 W @ 12 Vdc

8 to 13.5 Vdc

Weight:

1.11 lbs (0.5 kg)

Operating temperature:

-40 to +80°C

3. Installation

For measurement of net radiation, it is most important that the instrument is

located in a place that is representative of the entire area that one wishes to

study.

When installed on a mast, the preferred orientation should be such that no

shadow is cast on the net radiometer at any time during the day. In the

Northern Hemisphere this implies that the net radiometer should be mounted

on the south side of the mast.

It is suggested that the CNR4 is mounted at a height of at least 1.5 meters

above the surface to avoid shading effects of the instruments on the soil and to

promote spatial averaging of the measurement. If the instrument is h meters

above the surface, 99% of the input of the lower sensors comes from a circular

area with a radius of 10h. Shadows or surface disturbances with radius < 0.1h

will affect the measurement by less than 1%.

It is recommended that the CNR4 be mounted to a separate vertical pipe at

least 25 feet from any other mounting structures. The mounting bracket (CSI

p/n 26120) is used to mount the CNR4 directly to a vertical pipe, or to a

CM20x series Sensor Crossarm. Mount the sensor as follows:

1. First, attach the mounting rod to the CNR4, as shown in Figure 3-1.

2. Attach mounting bracket (CSI p/n 26120) to the vertical mounting

pipe or CM20x series Sensor Crossarm, using the U-bolts provided

as shown in Figure 3-2.

3. Insert the mounting rod of the CNR4 sensor into a mounting block of

the mounting bracket (CSI p/n 26120), making sure the sensor points

to the direction of the arrows marked as “SENSOR” on top of the

bracket (see Figure 3-2). Perform a coarse levelling of the sensor

using the bubble level on the top of the CNR4, and tighten the four

screws on top of the mounting bracket to properly secure the

mounting rod so that it does not rotate.

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