Ultraviolet Sensor
and Meters
SU-100, MU-100, MU-200
www.apogeeinstruments.com
435.792.4700
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Measures combined UVA and UVB radiation
Self-cleaning, dome-shaped head
Measure UV filtering of various materials
Test UV stability of products
Available in sensor-only version with pigtail leads (for
dataloggers) or with handheld meter
Custom options available
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Four year warranty
Low levels of UV light have a positive effect on plant growth and seed germination but higher levels can be harmful
and even toxic. UV sensors can be used to measure the light intensity from 250 nanometers to 400 nanometers,
whether the source is the sun, fluorescent lights, germicidal lamps or other sources of UV radiation.
Each meter can store up to 99 manually recorded measurements. In automatic mode, measurements are made
every 30 seconds with averages stored every 30 minutes. Daily totals are also calculated recording up to 99 days.
MU-100
MU-200
AL-100 Leveling plate
AM-110 Mounting Bracket
SPECIFICATIONS
Calibration Uncertainty: ± 10 % (see Calibration Traceability below)
Measurement Repeatability: < 1 %
Non-stability (Long-term Drift): < 3 % per year
Non-linearity: < 1 % (up to 300 µmol m-2 s-1)
Response Time: < 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: 0 to 50 C
< 90 % non-condensing relative humidity up to 30 C
< 70 % non-condensing relative humidity from 30 to 50 C
Meter Dimensions: 12.6 cm length, 7.0 cm width, 2.4 cm height
Sensor Dimensions: MU-200: 2.4 cm diameter and 2.8 cm height
Mass: MU-100: 150 g
MU-200: 180 g
Cable: 2 m of shielded, twisted-pair wire.
Additional cable available
Santoprene rubber jacket (high water resistance, high UV stability, flexibility in cold conditions)
Calibration Traceability:
Apogee MU series UV meters are calibrated through side-by-side comparison to the mean of four 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:
Spectral response estimate of Apogee MU series
meters. 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.
UV-B MEASUREMEN TS AND SPECTRAL E RRORS:
Apogee Instruments MU series meters measure ultraviolet radiation between 250 and 400 nm in micromoles of photons per
square meter per second. Although the UV radiation between 280 and 315 nm (UV-B) is critically important in photochemical
and photobiological reactions, less than 3 % of the UV photons are in this range. Because only a small fraction of the photons
are in the UV-B range, the MU series meters cannot be used to selectively measure UV-B radiation. The MU series is sensitive
to UV-B radiation, but it is included with the UV-A radiation to provide a total measurement of UV radiation.
In addition to naturally occurring UV radiation from the sun, there are many electric light sources that emit UV radiation (e.g.,
cool white fluorescent, metal halide, mercury arc, and germicidal lamps). Although the relative wavelengths of UV radiation
differ among sunlight and electric lights, the error estimates shown in the table below indicate that the MU series meters
provide reasonable estimates of UV radiation coming from electric lamps (table provides spectral error estimates for UV
radiation measurements from radiation sources other than clear sky solar radiation). For common lamps, the error is less than
10 %. The MU series meters are particularly useful for determining the UV filtering capacity of the transparent plastic and
glass barriers that are commonly used below electric lamps.
Spectral Errors for UV Radiation Measurements with Apogee MU series UV meters
Radiation Source (Error Calculated Relative to Sun, Clear Sky)
Sun (Clear Sky)
Sun (Cloudy Sky)
Reflected from Grass Canopy
Reflected from Deciduous Canopy
Reflected from Conifer Canopy
Reflected from Agricultural Soil
Reflected from Forest Soil
Reflected from Desert Soil
Reflected from Water
Reflected from Ice
Reflected from Snow
Cool White Fluorescent (T5)
Metal Halide
High Pressure Sodium
Incandescent
Mercury Arc
Error [%]
0.0
< 0.5
< 0.5
< 0.5
< 0.5
< 0.5
< 0.5
< 0.5
< 0.5
< 0.5
< 0.5
9.0
2.8
-1.7
-3.3
17.8
APOGEE INSTRUMENTS, INC. 721 WEST 1800 NORTH, LOGAN, UTAH 84321, USA
TEL: (435) 792-4700 | FAX: (435) 787-8268 | WEB: APOGEEINSTRUMENTS.COM
Copyright © 2013 Apogee Instruments, Inc.