2 ABOUT SRS SRS Sensors
The SRS is a digital sensor. Its outputs follow the SDI-12 stan-
dard. The SRS is best suited for use with Decagon’s Em50, Em50R,
and Em50G data loggers. However, customers can use the SRS with
other loggers, such as those from Campbell Scientific.
Figure 1: Hemispherical Version
Figure 2: Field Stop Version
2.2 Specifications
Accuracy: 10% or better for spectral irradiance and radiance values
Measurement Time: < 300 ms
NDVI Wavebands: 630 and 800 nm central wavelengths, with 50
and 40 nm full width half maximum band widths
PRI Wavebands: 531 and 571 nm central wavelengths, with 10 nm
full width half maximum band widths
Dimensions: 43 x 40 x 27 mm
Power Requirements: 3.6 to 15 V DC, 4 mA (reading, 300 ms) 30
µA (quiescent)
Operating Temperature: −40 to 50
◦
C
Connector Types: 3.5 mm (stereo) plug or stripped & tinned lead
wires (Pigtail)
Cable Length: 5 m standard; custom cable length available upon
request.
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