Sunshine Duration Sensors
The WMO has defined sunshine duration as the time interval when direct solar radiation exceeds 120W/m2. There are many ways to measure or calculate sunshine duration from direct or global radiation data.
EKO can offer 3 different methods either based on direct or global radiation measurements.
- The most accurate method to measure sunshine duration is to use the MS-56 pyrheliometer in combination with a sun tracker STR-21G/22G.
- The second alternative is the MS-093 Sunshine duration sensor which is only sensitive to the direct radiation component and provides a pulse output when the irradiance exceeds 120 W/m2.
- Using a Pyranometer measuring global radiation. The direct radiation component can be estimated when the solar position is known.
EKO Sunshine Duration Meter MS-093 has a specially designed and rotating mirror, which reflects the …
|Output||100 pulses/hour in fine weather|
|Directional response||±5% (within latitude ±23.5°)|
|Temperature dependency||±5% / °C(within -20 to +40°C)|
|Threshold value||120 W/m2|
|Detector type||Pyro electric detector (spectral response 0.3 - 2.5 µm)|
|Integration error||less than 10 min/day (clear days)|
|Dimensions||350 x 250 x 200 mm (including optional base plate)|
|Power requirements||12 VDC, 400mA|
|Base plate||350 x 250 mm / leveling feet|
|Power supply||100 ~ 240 VAC / 12 VDC / 200 x 140 x 80 mm / 2.5 kg|
|Heater||100 ~ 240 VAC @ 50W/ Control thermostat / heater switches < 0°C|
|Blower Fan||100 ~ 240 VAC @ 16W
Weathering of materials is most often an irreversible process affecting the cosmetic properties or strength of materials. This aging process is mainly driven by UV radiation, Heat, ...
Calibration & Traceability
The MS-093 Sunshine duration sensor is calibrated indoors with a 1000 W/m2 Xe light source. To set the 120 W/m2 threshold level the output of the Xe beam is precisely attenuated by a set of optical filters to a level of 120 W/m2.
Frequently Asked Questions
The sensitivity of the solar sensor will slightly deviate with time when it is exposed to solar radiation. Therefore it is advised to re-calibrate the sensor every two years. For calibration ...