CMP 11 secondary standard pyranometer

CMP11 Pyranomètre

Le CMP11 utilise la technologie de détection de température compensée développée à l’origine pour le CMP22 ; il est un peu plus performant que le CMP6. Il est particulièrement adapté aux réseaux météorologiques ; la réduction du temps de réponse de 1,66 secondes (63%) répond aux exigences des applications de l’énergie solaire.

Une prise étanche est fixée pour le câble jaune de détection des signaux qui est disponible en diverses longueurs pré-câblées.

Le niveau à bulle intégral est situé en haut du boîtier et peut être surveillé sans avoir à retirer la protection solaire redessinée et encliquetable qui recouvre le connecteur. Le raccord doté de contacts dorés facilite un remplacement et une nouvelle calibration. La cartouche de séchage est vissée et elle peut être retirée simplement afin de remplacer le dessiccateur qui est fourni dans les sachets de recharge appropriés.

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Specifications

Gamme spectrale	285 to 2800 nm
Sensibilité	7 to 14 µV/W/m²
Temps de réponse	< 5 s
Décalage du zéro	A < 7 W/m²
Décalage du zéro	B < 2 W/m²
Erreur directionelle (jusqu'à 80º a 1000 W/m²)	< 10 W/m²
Dépendence en température de la sensibilité (-10 ºC à +40 ºC)	< 1 %
Gamme de températures de service	-40 °C to +80 °C
Flux lumineux solaire maximal	4000 W/m²
Champ visuel	180 °

Downloads

STEP files

CMP 11 pyranometer - universal CAD drawing (STEP)

Datasheets

Datasheet - Albedometers - EN

Manuals

Newsletters

Brochures

Technical info

FAQ

In our PV application the cable from the CMP 11 (50 meters) will go along other cables that come from the PV panels in which there is a DC voltage and around 100 Amps. Will these cables affect the measurement?
- The disturbance on the cables on the CMP 11 is difficult to judge from a distance. A test would give the best criteria in this case.
  Simply cover the CMP 11 so it is fully dark (in box with cloth etc.) Log the data over a period that disturbance is expected, at least one day.
  If the data is zero no problem is to be expected.
  
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Can I use a pyranometer under water?
- The CMP series can also be used under water, the depth is limited to 1 meter and can only be used for short measurements.
  
  It is advisable not to keep the Pyranometer of the CMP series under water for longer than 30 minutes.
  
  The SP Lite2 pyranometer and the PQS 1 PAR Quantum Sensor can be used for a longer period under water, the depth is limited to 2 meters. Please also take “breaking of light on the water surface” in consideration.
  
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Negative output during nighttime measurements?
- This error is related to the zero offset type A. Normally this zero offset is present when the inner dome has a different temperature from the cold junctions of the sensor. Practically this is always the case when there is a clear sky. Because of the low effective sky temperature (<0 °C) the earth surface emits roughly 100 W/m2 longwave infrared radiation upwards. The outer glass dome of a pyranometer also has this emission and is cooling down several degrees below air temperature (the emissivity of glass for the particular wavelength region is nearly 1). The emitted heat is attracted from the body (by conduction in the dome), from the air (by wind) and from the inner dome (through infrared radiation). The inner dome is cooling down too and will attract heat from the body by conduction and from the sensor by the net infrared radiation. The latter heat flow is opposite to the heat flow from absorbed solar radiation and causes the well known zero depression at night. This negative zero offset is also present on a clear day, however, hidden in the solar radiation signal.
  
  Zero offset type A can be checked by placing a light and IR reflecting cap over the pyranometer. The response to solar radiation will decay
  with a time constant (1/e) of 1 s, but the dome temperature will go to equilibrium with a time constant of several minutes. So after half a minute the remaining signal represents mainly zero offset type A.
  
  Good ventilation of domes and body is the solution to reducing zero offsets even further. Kipp & Zonen advises the CVF 3 Ventilattion Unit for optimal ventilation and suppression of zero offset type A. Using the CVF 3 zero offset type A will be less than 3 W/m2.
  
  Is your question still unanswered? Contact Support