Extra
The CMP10 has been replaced by the CMP10x.
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
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.
Yes, however the data logger needs to be placed on the surface (it is weather resistant, but cannot be lowered into the water).
We advise to re-calibrate the Pyranometer every two years.
The 50 % points are the wavelengths where the output of the instrument is 50 % reduced with 100 % input.
CMP 3
CMP 6
CMP 11
CMP 21
CMP 22
WMO
Moderate quality
Good quality
High quality
ISO
Spectrally Flat Class C
Spectrally Flat Class B
Spectrally Flat Class A
Secondary Standard
The instrument has an analog output, therefore the resolution is infinite. Every change is noticed, no matter how small it is.
The bandwidth of most pyranometers is 285 to 2800 nm. This covers the full solar spectrum as shown below.
There are some exceptions:
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.
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.
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.
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.
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.
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.
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.