Kipp&Zonen BSRN Scientific Solar Monitoring System - Manual (Page 103)

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B 2. Pyranometers
B 2.1 Eppley Laboratory Model PSP Pyranom eter
The Precision Spectral Pyranom eter is designed for the m easurem ent of sun and sky radiation totally
or in defined broad wavelength bands. It com prises a circular m ulti-junction wire-wound Eppley therm opile.
The therm opile has the ability to withstand severe m echanical vibration and shock. Its receiver is coated
with Parson's black lacquer (non-wavelength selective absorption). This instrum ent is supplied with a
pair of rem ovable precision ground and polished hem ispheres of Schott optical glass. Both hem ispheres
are m ade of clear W G295 glass which is uniform ly transparent to energy between 0.285 to 2.8 µm . Other
Schott coloured glass outer hem ispheres include clear (GG395), yellow (GG495), orange (OG530), red
(RG630), and dark red (RG695). For special applications, other Schott glasses and Infrasil II quartz
hem ispheres are available.
Included is a spirit level, adjustable levelling screws and a desiccator which can be readily inspected.
The instrum ent has a cast bronze body with a white enam elled guard disk and com es with a transit/storage
case.
A calibration certificate traceable to the W orld Radiation Reference and a tem perature com pensation
curve is included.
Specifications
Sensitivity: approx. 9 :V W m -1 2
Im pedance: approx. 650 S
Tem perature Dependence: ±l % over am bient tem perature range -20 to +40 °C tem perature
com pensation of sensitivity (can be supplied over other ranges
at additional charge)
Linearity: ±0.5% from 0 to 2800 W m -2
Response tim e: 1 second (1/e signal)
Cosine: ±1% from norm alization 0-70° zenith angle; ±3% 70-80° zenith
angle
Mechanical Vibration: tested up to 20 g's without dam age
Calibration: integrating hem isphere
Size: 5.75 inch diam eter, 3.75 inches high
W eight: 7 pounds
Orientation: Perform ance is not affected by orientation or tilt
B 2.2 Kipp & Zonen Delft BV CM11 Pyranom eters
The CM11 incorporates a 100-therm ocouple sensor, im printed on a thick-film substrate, housed under
K5 glass dom es. The sensor is rotationally sym m etrical. A white screen prevents the body from heating
up. The pyranom eter is supplied with a spirit level and screws for accurate levelling. A drying cartridge
keeps the interior free from hum idity.
All pyranom eters are supplied with a calibration certificate which also shows the level of directional error.
Specifications
Response tim e < 15 s
tim e for 95 % response