IAN HANBY - CHARTERED ENGINEER

ASSEMBLY OF THE NEW DRY FOAM FRISBEE DUST DEPOSIT GAUGE

 

Each kit consists of :


1.   Collector/bird guard assembly
2.   Long PVC tube with grey or black PVC spigot at its top
3.   Short PVC tube
4.   Black Powder-coated folding tripod
5.   1 x 2.5mm Allen key
6.   2 x Collecting bottles (5 or 10-litre)
7.   2 x Foam particle traps

The long PVC tube is normally packed inside the tripod to protect it from damage during transit, and the smaller items can be found in one of the sample bottles.

The long and short PVC tubes should be joined and inserted into the tripod, from the top. (The grey or black 100mm long spigot is the top of the plastic tube.) The collector/bird guard assembly is pushed into this grey PVC spigot at the top of the tripod. It should penetrate about 70mm, at which stage the aluminium boss of the bird guard will bottom on the spigot. The assembly should then be locked in position using the 2.5mm Allen key on the lower M5 grub screw.

The frisbee-shaped collector is also fixed to the bird guard by a similar screw - this can be loosened if you need to remove the collector from the bird guard. In order to remove the collector, it is first necessary to slacken the nylon filament of the bird guard. This filament is threaded through the holes in the stainless steel rods except at its final location. Here it is merely hooked over the rod. The free ends of the nylon filament have been left deliberately long so that the location of the hooked-over piece can be seen. The foam particle trap can be removed with or without this filament slackened.

 

Changing the sample bottles can be carried out in three ways, namely:

1. Loosen the grub screw holding the bird guard to the tripod, then remove the complete collector/bird guard assembly. Raise the inner PVC pipe sufficiently for the bottle to be removed.

OR

2. Unscrew the cap of the bottle and slide it up the white PVC tube, then carefully tilt and withdraw the bottle from within the tripod.

OR

3. Raise the central stem of the tripod sufficiently for the bottle to be removed.

It is a good idea to rinse the bottles, collector and foam pad with clean water before using for the first time. If algal growth is a problem during the summer months, it can be reduced by excluding sunlight from the bottle by using a black bin-liner or black adhesive tape around the bottle. When siting the gauge, ensure that the central stem of the tripod is truly vertical, so as to avoid water standing in the collector.

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