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DIRECTIONAL DUST DEPOSIT GAUGE to B.S.1747
We no longer supply these dust gauges - but if you want one - they are quite easy to fabricate from plastic tubes. a metal or wood stand, and some 1 litre wide mouth bottles - here are some instructions - and a PDF download
Drawing shows assembled gauge - Unit dimensions
Economical and simple to use equipment for monitoring airborne dust particles in the environment needs no power no moving parts - less attractive to vandals when placed in remote locations.
This simple unit has four vertically mounted tubes, each with a vertical slot, which is placed in the field to be monitored, with the tube slots facing N,S,E and W. The bottom of each tube is fitted with a one litre bottle. Any airborne dust from each of the four compass directions settles inside the tube and into the bottles. The unit is normally left in place for about four weeks, then all residual dust on the inner tube walls is washed into the bottles and the bottles removed. The contents of each bottle is filtered, and dried to obtain a weight for the dust deposit for each direction. The dust can be further analysed if required. For a simple indication of the dust deposit levels the turbidity of the aqueous dust suspension collected in each bottle can be measured.
Instruction - How to make one :
Plastic tubes - use standard 75 mm (3") plastic drainage tube from plumbers merchant, Cut 4 x 300mm lenghts. In each tube cut a slot 340mm x 45 mm with the slot 180mm from the bottom and 80 mm from top of tube ( see drawing) At the back of the slot drill 2 x 6mm holes for mounting bolts/screws - to mount the 4 tubes on the stand. The top of the 75mm tubes needs to be covered e.g. a neat solution is plastic pipe end covers - or a pipe cap to suit the size of drainage pipe.
Plastic bottle - 4 x litres - wide mouth, with lids. Try local packing suppliers. You need to figure outr a way to fix the bottles to the bottom of the tubes. - Try cutting a ~75mm hole in the bottle lids, and glue of fix with small metal brackets these lids to the bottom of the tubes. Then the bottles can be held in place to collect the deposited dust.
Stand - this could be made from 300x300mm steel plate base with 40x40x 15000mm high steel square section tube, with some small bracing ( see diagram) - this would need to be welded. A simpler stand of similar size could be fabricated in wood
Assemby - The four plastic tubes should be mounted with screws/bolts to the upright post of the stand with the tops of the plastic tubes flush with the top of the upright post.
Plastic netting - open mesh netting - e.g. fine garden netting - small pieces wrapped around the front of the tube slots to prevent birds nesting inside the tubes !
Download copy of instruction including information on using the gauge
SIMPLE LINE DRAWING OF GAUGE CONSTRUCTION BELOW
© 2008 F.W.Parrett Limited