Casella CEL Airborne particulate monitoring system - Manual (Page 6)

HB3256-03 Page 4
I
NSTALLATION
.
Warning: BEFORE ATTEMPTING TO ASSEMBLE AND INSTALL THE APM950,
PLEASE CAREFULLY STUDY THE INSTALLATION PROCEDURES AND
DRAWINGS PROVIDED IN THIS MANUAL. FOR SPECIALISED SYSTEMS,
SUPPLEMENTARY ASSEMBLY NOTES MAY ALSO BE PROVIDED.
You should contact your supplier immediately, should any parts be missing or damaged.
Choice of site.
Particular attention should be paid when choosing a suitable site for the APM950 system since
particulate concentrations and meteorological parameters can show significant variations over
small distances. A site should be chosen where the ambient air quality may be considered
representative of the general scene. Avoid locations where the equipment can be influenced by
localised sources of contamination such as ventilation or flue outlets, vehicle emissions or
construction work.
The site should be free from air turbulence caused by trees, buildings, hills etc. It should not be
sheltered or unduly exposed such as on the crest of a steep hill.
It should be noted in particular that a roof does not provide a suitable exposure for an
anemometer unless it is mounted well above the roof.
The cross arm assembly supplied with the wind speed and direction sensor is designed to be
mounted onto a 50mm diameter pole. When setting up the cross arm, the wind vane body should
be set up to point north.
Frame based systems.
For frame mounting applications please refer to the frame assembly drawings. Frame assembly
can be aided by beginning with the two upright sections laying down. The base end of the two
upright sections is denoted by the larger drilled holes. Ensure the correct size fasteners as
indicated on the drawing are used throughout the assembly. The APM950 enclosure can now be
secured to the frame using the correct bolts and washers as shown in the drawing.
The frame assembly must be securely mounted by its four feet onto a solid surface such as a
purpose made concrete base or roof of a building etc. A typical concrete base would be 1.5
metres square and approximately 20 to 30cm thick. The frame should be vertical and level.
In the majority of applications M8 rawl bolts maybe used to secure the station frame to the
mounting surface (M8 rawl bolts require a 14mm diameter mounting hole). The actual fixing
technique used should pay consideration to the material type, roof structure and material
thickness present at the installation site.