Specifications

A Remote Automated Water Quality Stream Gauging System Design 12
12
The studs can be tightened after the adhesive has cured. Loading time is approximately 12
hours at 25
o
C.
Auto sampler enclosure
Stainless steel bolts are threaded through the tabs on the base of the enclosure and passed
through the expanded mesh on the platform. Backing plates are placed on the bolts below
the mesh and the bolts are tightened to clamp the enclosure in place. Once in position a
50mm bulkhead fitting can be attached to the bottom of the enclosure to provide an entry
point for the cables from the in stream instruments.
The auto sampler is installed in the enclosure after the cabling and other works behind the
false back panel have been completed as it impedes access to the panel after installation.
The sample hose is routed through the 50mm access gland in the back panel return along
with the trigger cable from the data logger. Sites with a submersible pump need an additional
T-piece and bypass outlet to be installed behind the back panel to allow the bypass system
to operate. The length of the cables and hose needs to be sufficient to allow the sampler to
be removed from the enclosure for unloading samples and carrying out maintenance without
the need to disconnect the sampler.
Solar panel array
In the case of the small platform the solar panel array is mounted on a separate mounting
pole constructed from 32mm NB galvanised pipe. The pole is attached to the platform using
two U-bolts bolted through pre-fabricated tabs in the stand frame and is concreted into place
in a 200mm deep footing.
The large platform design uses a solar panel mounting pole fabricated from 65mm SHS
which slides telescopically into the 75mm SHS uprights making up the stand legs. The pole
is then secured into place using M12 x 100mm galvanised bolts which pass through both the
stand uprights and mounting pole.
Electronics enclosure
The data logger, telemetry system and other control components for the system are housed
in a B&R Weatherproof enclosure which mounts directly above the auto sampler enclosure.
On the small platform the solar panel pole provides the mounting point for the enclosure
which is attached using backing plates and U-bolts.
A separate pole is used to attach the enclosure to the large platform. A 1.5 m long piece of
32 mm NB pipe is attached to the platform handrails with U-bolts. The enclosure is attached
to this pole in the same way as for the small platform.
The electronics enclosure is located directly over the cavity behind the false back in the
sampler enclosure. Once in position, a 50 mm gland is attached to the top of the auto
sampler enclosure and 50 mm corrugated conduit is used to join the two components.
3.5. Rain gauge stand
The rain gauge stand is installed in an area clear of obstructions which may influence rainfall
collection. The stand is inserted into a 250 mm x 250 mm x 300 mm footing which is then
filled with concrete. The stand should be levelled before the concrete sets. A trench is
excavated between the rain gauge stand and the platform to run the cable. The cable should
be buried in conduit to a depth of 200 mm to prevent damage.