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Operation Manual HORIBA APDA-371
Particulate Monitor
Date:
April, 2010
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HORIBA Europe GmbH, Julius-Kronenberg-Str. 9, D-42799 Leichlingen, Telefon: +49(0)2175-8978-0, Fax: +49(0)2175-8978-50
Page 9
head.
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If the APDA inlet is the highest point on a building, then lightning rods must be installed to prevent destruction of
the APDA during electrical storms.
Inlet Radius Clearance:
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The APDA-371 inlet must have a one meter radius free of any objects that may influence airflow characteristics,
including the inlet of another instrument.
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If a APDA-371 is to be installed at a station with other APDA or FRM sampler, the inlets of each sampler must
be no less than one meter apart from each other.
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If the APDA is to be collocated with another APDA instrument or FRM sampler, then the inlets must be spaced
between one and two meters apart. Two meters is recommended where possible.
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If installing near a PM
10
SSI Hi-Volume sampler, then the distance between the inlet of the APDA-371 and the
Hi-Vol should be no less than three meters.
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The APDA-371 inlet must be located at least two meters from obstructions such as short walls, fences, and
penthouses.
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If located beside a major obstruction (such as a building) then the distance between the unit and the building
must be equal to twice the height of the building.
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The inlet must be at least 20 meters from the drip line of any overhanging trees.
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There must be at least a 270 degree arc of unrestricted airflow around the inlet. The predominant direction of
concentration movement during the highest concentration season must be included in the 270 degree arc.
Particulate Sources: To avoid possible errors in the concentration measurements, the inlet must be located as far as
possible from any artificial sources of particulate, such as blowers, vents, or air conditioners on a rooftop. Especially if
any of these types of devices blow air across the inlet of the APDA-371. Even sources of filtered air must not blow
across the inlet.
Spacing from Roadways: The APDA-371 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 APDA inlet.
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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 APDA must be located at least five meters from the nearest traffic lane.
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The APDA must be located at least 25 meters from any elevated roadway greater than five meters high.
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The unit should be located as far as possible from unpaved roadways, as these also cause artificial
measurements from fugitive dust.
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The unit should not be installed in unpaved areas unless year-round vegetative ground cover is present, to
avoid the affects of re-entrained fugitive dust.
2.4
Mounting Options in a Walk-In Shelter
When the APDA-371 is to be located in a walk-in shelter, the unit will have to be installed either in an equipment rack or
on a bench-top. HORIBA recommends using an equipment rack when possible, as it does a better job of keeping the
unit level and in the correct placement. A rack also tends to be a cleaner installation and is more space-efficient.
However, either method may be used as long as the mounting is level and allows the inlet tube to be perfectly vertical.
HORIBA supplies brackets standard rack-mount screws with each unit. Take the following into account when planning
your mounting:
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Rear Access: It is important that your mounting leaves plenty of access to the rear of the APDA-371 unit for
wiring connections and maintenance. At least five inches is required. Full access to the back is recommended
whenever possible.
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Top Access: It is necessary to have a minimum of eight inches clearance between the top of the APDA inlet
receiver and the bottom of the shelter ceiling to accommodate the smart inlet heater which mounts on the inlet
tube directly above the APDA.
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Mobile Shelters: If the APDA-371 is being installed into an equipment rack in a mobile shelter or van, the
instrument must be supported from the bottom in addition to the rack brackets, due to additional strain. The
foam shipping rings must also be inserted any time a mobile shelter is moved with the APDA-371 inside.
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Rack Modifications: It is often necessary to modify the top of the equipment rack by cutting a hole to allow the
inlet tube to extend through to the ceiling. The drawing below shows the location of the hole. Note: The inlet