Apogee Ultraviolet Meter MU-100 Series Manual

Measuring Radiation

Measurements indicate that less than 0.4% of the photon flux
from sunlight falls below 320 nm; 2.3% falls between 320 and
350 nm, and 6% falls between 350 and 400 nm. Although the
UV radiation between 250 and 320 nm is critically important in
photochemical and photobiological reactions, only about 5% of
the UV photons are in this range. Because only a small fraction
of the photons are in the UV-B range, this meter cannot be
used to selectively measure UV-B radiation. The sensor is
sensitive to UV-B radiation, but it is included with the UV-A
radiation to provide a total measurement of UV radiation.
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Ultraviolet Meter
The ultraviolet meter measures and displays instantaneous
readings of the ultraviolet radiation between 250 and 400
nanometers (nm) in micromoles (µmol) per meters per second
or Watts per meters squared.

Using the Meter

1) Press the power button to start. The
meter will turn itself off 2 minutes after
button is pushed to conserve battery.
2) Choose Calibration: To select between
µmol and Watts calibration, push
and up/down to make choice. Once desired
calibration is blinking, press
times to begin.
3) Choose Mode: To choose between SMPL
and LOG modes push mode
to make choice. Once desired mode is blinking,
press mode two more times to begin.
For Automatic Measurements:
Use LOG mode. Meter will power
on/off to record a measurement every
thirty seconds.
For Manual Measurements: Use SMPL mode.
Press sample to take a measurement. Store up to 99
SMPL measurements.
4) Reset Meter: From LOG or SMPL mode, press
(RUN should be blinking), then while pressing down, press
mode once.
CAUTION: Resetting will erase ALL measurements.
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mode once
mode three more
twice and up/down
mode
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twice