EKO INSTRUMENTS CO., LTD. - Pyranometers MS-802/802F/402/402F/602 - Instruction Manual Ver.13
1. Inner and Outer Glass Domes
A glass dome creates a sealed environment for the detector and protects it against dirt, rain and wind.
Besides the mechanical protection, the optical properties of the glass dome(s) minimize the undesired
influence of long wave radiation on the shortwave radiation: the domes of the EKO pyranometers are only
transparent for radiation emitted by the sun. Hence they block the undesired infrared radiation emitted by the
Earth’s atmosphere. The glass domes of all EKO thermopile pyranometers permit to measure the
cosine-weighted global solar irradiance over the entire hemisphere, i.e. with a field-of-view of 180 degree.
2. Sensor
The thermopile detector of the pyranometers generates a voltage signal that is proportional to the solar
irradiance absorbed on the black surface of the detector. The thermopile detector, which is the heart of the
sensor, determines the majority of the measurement properties (e.g. response time, zero offset B,
non-linearity, sensitivity, etc.). EKO thermopile detectors are very stable in time due to the high stability of the
black absorber material.
3. Sun Screen/Cover, Sensor Body, and Spirit Level
EKO pyranometers (except MS-602) have a sun screen (or a cover for models with ventilation unit) to prevent
excessive body temperature increase generated by direct sun light. The solid pyranometer body is made of a
combination of non-ferroalloy and ferroalloy metals which are resistant against environmental impact, heat,
rain and dusts.
The integrated sprit level is used to setup and maintain the sensor in a horizontally leveled position.
4. Drying Cartridge
A drying cartridge filled with silica gel is used to keep the sensor volume dry. The dry air inside the sensor
body prevents condensation of humidity on the inside of the glass dome. The silica gel (desiccant) of the
insert-able drying cartridge can be easily replaced. (*MS-602 does not have an accessible drying cartridge.)
5. Cable and Cable Connector
All pyranometers are shipped with a 10 meter long output cable as standard length*. The cables are
connected to the pyranometers by a rugged and sealed connector. The loose ends of the cables are fitted
with pin terminals for easy connection to data acquisition devices. The special cable and connector material is
resistant to temperature and humidity fluctuations. The humidity and UV resistant cable and connector are
suitable to be used in harsh outdoor environmental conditions for a long period of time. The ventilation unit
also comes with a power cable (either AC power or DC power types).
*If longer cables are required, please contact EKO Instruments or your distributor.
6. Ventilation Unit
The ventilation unit is an optional accessory for the MS-802 and the MS-402. The glass domes of a
pyranometer with a ventilation unit will remain almost always free of frost, snow, dew and dust deposition.
Therefore, measurements obtained with pyranometer and ventilation unit are in general more accurate than
the measurements obtained with the pyranometer without ventilation unit. However, periodic maintenance,
such as cleaning the glass dome, is nevertheless recommended, even when using a ventilation unit.
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