SPECIFICATIONS
Calibration Traceability
Apogee SU-100 UV sensors are calibrated through side-by-side comparison to the mean of three Apogee model
SU-100 transfer standard UV sensors under high intensity discharge metal halide lamps. The transfer standard UV
sensors are calibrated through side-by-side comparison to an Apogee model PS-200 spectroradiometer under
sunlight (clear sky conditions) in Logan, Utah. The PS-200 is calibrated with a LI-COR model 1800-02 Optical
Radiation Calibrator using a 200 W quartz halogen lamp. The 1800-02 and quartz halogen lamp are traceable to
the National Institute of Standards and Technology (NIST).
Spectral Response
SU-100
Sensitivity
0.2 mV per µmol m
-2
s
-1
; 0.61 mV per W m
-2
Calibration Factor
(reciprocal of sensitivity)
5 µmol m
-2
s
-1
per mV; 1.65 W m
-2
per mV
Calibration Uncertainty
± 10 % (see Calibration Traceability below)
Measurement
Repeatability
Less than 1 %
Non-stability
(Long-term Drift)
Less than 3 % per year
Non-linearity
Less than 1 % (up to 300 µmol m
-2
s
-1
)
Response Time
Less than 1 ms
Field of View
180º
Spectral Range
250 nm to 400 nm (see Spectral Response below)
Directional (Cosine)
Response
± 10 % at 75º zenith angle
Temperature Response
Approximately 0.1 % per C
Operating Environment
-40 to 70 C; 0 to 100 % relative humidity
Dimension
24 mm diameter; 28 mm height
Mass
75 g (with 5 m of lead wire)
Cable
5 m of two conductor, shielded, twisted-pair wire; additional cable available in multiples of 5
m; TPR jacket (high water resistance, high UV stability, flexibility in cold conditions); pigtail lead
wires
Spectral response estimate of Apogee
SU-100 UV sensors. Spectral response
measurements were made at 10 nm
increments across a wavelength range
of 200 to 450 nm in a monochromator
with an attached electric light source.
Measured spectral data were
normalized at 350 nm.
