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B 2. Pyranometers
B 2.1 Eppley Laboratory Model PSP Pyranometer
The Precision Spectral Pyranometer is designed for the measurement of sun and sky radiation totally
or in defined broad wavelength bands. It comprises a circular multi-junction wire-wound Eppley thermopile.
The thermopile has the ability to withstand severe mechanical vibration and shock. Its receiver is coated
with Parson's black lacquer (non-wavelength selective absorption). This instrument is supplied with a
pair of removable precision ground and polished hemispheres of Schott optical glass. Both hemispheres
are made of clear WG295 glass which is uniformly transparent to energy between 0.285 to 2.8 µm. Other
Schott coloured glass outer hemispheres include clear (GG395), yellow (GG495), orange (OG530), red
(RG630), and dark red (RG695). For special applications, other Schott glasses and Infrasil II quartz
hemispheres are available.
Included is a spirit level, adjustable levelling screws and a desiccator which can be readily inspected.
The instrument has a cast bronze body with a white enamelled guard disk and comes with a transit/storage
case.
A calibration certificate traceable to the World Radiation Reference and a temperature compensation
curve is included.
Specifications
Sensitivity: approx. 9 :V W m
-1 2
Impedance: approx. 650 S
Temperature Dependence: ±l % over ambient temperature range -20 to +40 °C temperature
compensation of sensitivity (can be supplied over other ranges
at additional charge)
Linearity: ±0.5% from 0 to 2800 Wm
-2
Response time: 1 second (1/e signal)
Cosine: ±1% from normalization 0-70° zenith angle; ±3% 70-80° zenith
angle
Mechanical Vibration: tested up to 20 g's without damage
Calibration: integrating hemisphere
Size: 5.75 inch diameter, 3.75 inches high
Weight: 7 pounds
Orientation: Performance is not affected by orientation or tilt
B 2.2 Kipp & Zonen Delft BV CM11 Pyranometers
The CM11 incorporates a 100-thermocouple sensor, imprinted on a thick-film substrate, housed under
K5 glass domes. The sensor is rotationally symmetrical. A white screen prevents the body from heating
up. The pyranometer is supplied with a spirit level and screws for accurate levelling. A drying cartridge
keeps the interior free from humidity.
All pyranometers are supplied with a calibration certificate which also shows the level of directional error.
Specifications
Response time < 15 s
time for 95 % response
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