17
2.1.1
Specifications of the CNR 4
General specifications
Environmental
0 - 100% RH
(Relative Humidity)
Definition
Intended for continuous outdoor use
Bubble level sensitivity
< 0.5º (bubble half inside ring)
General Construction
Sensor
Thermopile
Receiver paint
Carbon Black
Desiccant
Silica gel
(replaceable)
Housing materials
Anodized Aluminum body
Cable Connectors
Binder series 712
Cable (2 cables)
Color Yellow, Poly Urethane, Halogen free, UV blocking
Cable length (2 cables)
m
10 (standard), 25, 50 (optional)
Weight
kg
0.85 (without cables)
Shock / vibration
IEC 721-3-2-2m2
Operating temperature
°C
-40 to +80
CE
according to EC guideline 89/336/EEC 73/23/EEC
Environmental protection
IP 67
2.2
Properties of the pyranometer
The pyranometer consists of a thermopile sensor and a glass dome both integrated in the CNR 4 body. The
thermopile is coated with a black absorbent coating. The paint absorbs the radiation, and converts it to heat. The
resulting heat flow causes a temperature difference across the thermopile. The thermopile generates a voltage
output. The thermopile and the resistor determine most electrical specifications. The absorber paint and the dome
determine spectral specifications. The thermopile is encapsulated in the housing in such a way that its field of view
is 180 degrees, and that its angular characteristics fulfil the so-called cosine response.
