ES-405-9800 Manual Rev A Page 6
1.3 About the ES-405
The Met One Instruments, Inc. model ES-405 Particulate Profiler is a near reference air quality
sensor which automatically measures and records real-time airborne PM
1.0
, PM
2.5
, PM
4.0
, and
PM
10
particulate concentration levels using the principle of right angle laser light scatter. Detailed
descriptions of the ES-405 measurement modes can be found in Section 5.
Laser Light Scatter System
Sample air is drawn into the ES-405 detector chamber and subjected to an intense laser beam
located at right angles to the flow. Particles pass through the laser beam and scatter light that is
collected onto a photodiode detector. The output of the detector is analyzed to determine the
number and size of the particles and mathematically processed to provide an indicative particulate
mass measurement.
1.4 Laser Radiation Safety and Conformity
The ES-405, when properly installed and operated, is considered a Class I laser product.
Class I products are not considered to be hazardous.
This system contains a diode laser operating at 100 mW power and 785 nm wavelength. This is
not visible to the naked eye and can cause damage to the eye if directly exposed. A protective
optical housing fully encapsulates the laser beam and optics system within the ES-405. Do not
attempt to disassemble the optical module. Failure to comply with this instruction could cause
accidental exposure to laser radiation. The manufacturer certifies that this product operates in
compliance with following standards and regulations:
• FDA / CDRH This product is tested and complies with 21 CFR, Subchapter J, of the
health and Safety Act of 1968.
• US 21 CFR 1040.10.
Always power down the system whenever service or repair work is being performed inside the
instrument enclosure. Only trained technicians should attempt to repair the ES-405. Routine
maintenance does not require removing the instrument from its weatherproof enclosure.
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