ES-405-9800 Manual Rev A Page 14
Spacing from Roadways:
The ES-405 should usually not be located directly next to a major highway or arterial roadway, as
vehicle exhaust will dominate the concentration measurement. This effect can be difficult to
predict accurately as shifting winds may direct the plume toward or away from the inlet. An
obvious exception would intentional roadside particulate studies.
• Roads with a daily traffic volume of less than 3,000 vehicles are generally not considered
major sources of pollutants, and in this case the ES-405 should be located at least five
meters from the nearest traffic lane.
• The ES-405 should be located at least 25 meters from any elevated roadway greater than
five meters high.
• The unit should be located as far as possible from unpaved roadways, as these also cause
artificial measurements from fugitive dust.
• The unit should not be installed in unpaved areas unless year-round vegetative ground
cover is present, to avoid the effects of re-entrained fugitive dust.
3.2 Fall Hazard and Security Cautions
If the ES-405 is to be installed more than three meters above ground level, then the tripod legs
must be bolted down to prevent the unit from falling to the ground. An accidental fall may cause
major optical system damage requiring that the unit be returned to the factory for repairs. In
addition, dropping the ES-405 from any height will cause a potential safety hazard for those
below, and may damage the unit beyond repair.
The ES-405 tripod should be secured to the mounting surface in windy conditions to prevent the
unit from falling over, even at ground level. This is especially important in winds over 30 mph. If
bolt-down is not possible, then the tripod legs may be weighted down with sand bags or cinder
blocks to secure the unit. Wind or fall damage is not covered under warranty.
The ES-405 should be secured from theft or vandalism to the extent possible. A limited-access
rooftop or a fenced lot are often good places to deploy the unit. Solar panels and batteries are
highly susceptible to theft and should be secured.
3.3 Confined Sampling Locations
Because of the portable and versatile nature of the unit, the ES-405 is sometimes deployed in
confined or non-ambient locations to monitor localized particulate sources, such as tunnels,
mines, quarries, shopping malls, train stations, etc. Each of these applications is unique and
presents various challenges. We recommend that you contact a Met One Service representative
to determine the suitability of the unit if you plan a custom deployment like this. In any case, the
safety of those around the unit is paramount, and the protection of the unit from damage is very
important.
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