Preisgünstiges Pyranometer zur Messung der Global- und Diffusstrahlung

CMP3 Pyranometer

Pyranometer sind Sensoren zur Messung der Global- und / oder Diffusstrahlung. Das Pyranometer CMP3 ist kleiner und leichter als die anderen CMP Pyranometer. Es hat einen robusten 4 mm Glasdom und einen Spektralbereich von 285 bis 3000 nm. Seine kleine Größe machen es ideal für den Einsatz in der Landwirtschaft, bei der Überwachung von Solaranlagen und in industriellen Anwendungen. Das CMP3 hat ein Sensorelement welches auf dem Prinzip der Thermosäule basiert.

Das Pyranometer CMP3 entspricht der ISO 9060:2018 Norm, sowie den WMO Richtlinien und der WMO Klassifizierung Klasse C. Das CMP3 ist serienmäßig mit einer Nivellierwaage, entsprechenden Justierschrauben und einem steckbaren Kabel mit 10 m Länge versehen, wird individuell kalibriert und mit einem Kalibrierzertifikat ausgeliefert.

Das Pyranometer benötigt keine Spannungsversorgung! Es liefert ein kleines Ausgangssignal von 0 bis 55 mV proportional zur eingehenden Strahlung. Wird ein größeres Spannungsausgangssignal oder ein 4 bis 20 mA Signal benötigt, empfiehlt sich der Einsatz der AMPBOX.

Das CMP3 ist mit einer internen Trocknungspatrone ausgestattet, die mindestens 10 Jahre hält. Dies reduziert den Wartungsaufwand um ein vielfaches.

Eine Anleitung zur Installation des CMP3-Pyranometers finden Sie in diesem Video (ENGLISCH).

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Specifications

Spektralbereich (50% Punkte)	300 bis 2800 nm
Empfindlichkeit	10 bis 32 µV/W/m²
Ansprechzeit (95%)	20 Sek.
Nulloffsets A	< 15 W/m²
Nulloffsets B	< 5 W/m²
Richtungsfehler (bis zu 80° bei 1000 W/m² Strahlung)	< 20 W/m²
Temperaturverhalten (-10 °C bis +40 °C)	< 4 %
Betriebstemperaturbereich	-40 °C bis +80 °C
Max. Strahlungsaufnahme	2000 W/m²
Sichtfeld	180 °

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CMP3 pyranometer - universal CAD drawing (STEP)

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Manual - Pyranometers - CMP series - English

FAQ

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.
  
  Is your question still unanswered? Contact Support
What parameters or errors should we take into account if the source of light comes from a certain angle?
- If the Pyranometer remains horizontal the error involved is the directional error listed in the Pyranometer brochure.
  For CMP 3 < 20 W/m² and for CMP 22 < 5 W/m²
  
  Is your question still unanswered? Contact Support
If I use a pyranometer under water, can I connect a data logger to it ?
- Yes, however the data logger needs to be placed on the surface (it is weather resistant, but cannot be lowered into the water).
  
  Is your question still unanswered? Contact Support
What is the calibration frequency of a pyranometer?
- We advise to re-calibrate the Pyranometer every two years.
  Is your question still unanswered? Contact Support
What does spectral range of 310 – 2800 nm (50% points) mean?
- The 50 % points are the wavelengths where the output of the instrument is 50 % reduced with 100 % input.
  
  Is your question still unanswered? Contact Support

What is the WMO standard for the pyranometers?

What is the resolution of a pyranometer?
- The instrument has an analog output, therefore the resolution is infinite. Every change is noticed, no matter how small it is.
  Is your question still unanswered? Contact Support
What is the bandwidth of a pyranometer?
- The bandwidth of most pyranometers is 285 to 2800 nm. This covers the full solar spectrum as shown below.
  
  There are some exceptions:
  - CMP22 has a bandwidth of 200-3600nm (Quartz glass )
  - SP Lite has a bandwidth of 400-1100nm (silicon photo diode)
  - CMP3 has a bandwidth of 300-2800nm
  Is your question still unanswered? Contact Support
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.
  
  Is your question still unanswered? Contact Support
Do you have filters that can be used to verify spectral distribution over the following wave lengths? Ultraviolet - B 280-320 Ultraviolet - A 320-360 and 360-400 Visible 400-520, 520-640 and 640-800 Infrared 800-3000nm.
- No, we do not have filters for any of our pyranometers. The only way to do this in a correct way is to use a filter dome. Otherwise the directional response would be affected.
  Is your question still unanswered? Contact Support
Is there a standard product that converts the pyranometer output signal to 0-5V or 0-2V?
- The AMPBOX is the best solution.
  You will need a suitable PSU and a shunt resistor of 500 Ω to convert the current output (4..20mA) to a voltage output of 2-10V , or you will need a shunt resistor of 50 Ω to convert the current to a voltage output of 0.2-1V.
  
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What kind of pyranometer do you suggest for usage inside a greenhouse?
- CMP 6 in combination with PQS1 PAR Quantum Sensor is advised. CMP 6 for outside usage to measure Global solar radiation. PQS1 to measure PAR radiation inside which is most sensitive for plants and crops.
  
  Is your question still unanswered? Contact Support
What type of pyranometer can I use for my fixed PV panels farm?
- For this application the CMP10 and SMP10 are advised as they have an internal drying cartridge that will last for at least 10 years.
  
  Please note that the pyranometer needs to be mounted in the same angle (POA) as the PV panel.
  
  For users that prefer the desiccant visible Kipp & Zonen offers the CMP11 and SMP11 with visible and user changeable desiccant.
  
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What type of pyranometer can I use for my solar concentrators farm?
- None, solar concentrators are reflecting the direct solar radiation to a concentrator and are tracking the sun. You will need a pyrheliometer on a sun tracker to measure direct solar radiation.
  Is your question still unanswered? Contact Support
I would like to know what kind of output the CMP 6 Pyranometer has (analog or digital)? What voltage range do you have?
- The CMP 6, as with all our solar radiometers based on thermopiles has a continuous small analoge voltage output. For CMP 6 an irradiance of 1 W/^m2 generates an output signal in the region of 5 to 15 micro-volts. We have additional solutions to increase this voltage.
  Is your question still unanswered? Contact Support
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

Accessories

	Accessory	Description

Relevant news items

10/10/2016 A perfect time to calibrate

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3/9/2015 The Importance of Pyranometer Temperature Response

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4/5/2011 Measure tilted global and diffuse solar radiation

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Application examples

1/1/2010 Pyranometer in Solar Training System

8/19/2014 Solar Instruments applied to Vehicle Testing by Hyundai America Technical Center

8/19/2014 Bankable Data: Foundation of a Successful Solar Global Energy Solution

7/9/2010 Pyranometer versus reference PV cell

9/19/2013 Solar Carports Monitored with CMP 11 Pyranometers

7/28/2008 Solar Farms

12/19/2014 Pyranometers Save Heating Costs in Swedish Buildings

3/29/2014 Solar Monitoring Station for Moscow Environmental Protection Department

8/16/2012 Surya Design Characterises CPV Modules with Kipp & Zonen Instruments

6/2/2015 Kipp & Zonen France and PTS Mesures; a Long History of Cooperation

3/28/2014 Solar Energy Challenges in the Gobi Desert

11/28/2008 Improving Photovoltaic Efficiency

5/23/2017 Novel Estimation of Albedo Using a Drone Pyranometer

8/24/2017 Ventilation case study in Finland

1/15/2018 Measurement of UV radiation added to Antarctic site of the LES solar measurement network

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	CMP 3	CMP 6	CMP 11	CMP 21	CMP 22
WMO	Moderate quality	Good quality	High quality	High quality	High quality
ISO	Spectrally Flat Class C	Spectrally Flat Class B	Spectrally Flat Class A	Secondary Standard	Secondary Standard

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CMP3 Pyranometer

CMP3 Pyranometer

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