Description
13
available USB port. Refer to the sections
Installing the Software
and
Operating the
Software
for further information. Alternatively, refer to the Help text in the software.
The electronics associated with the load cell and pressure sensor are installed in an
enclosure that is mounted underneath the support for the Outlet Collecting Tank. The
load cell is located underneath the Outlet Collecting Tank and the pressure sensor is
connected to a tapping adjacent to the inclined manometer on the side of the Outlet
Collecting Tank. The lead from the pressure sensor can be disconnected from the
front of the electrical enclosure when it is required to remove the tank for emptying /
cleaning. After refilling the tank with water to the base of the weir it will be necessary
to re-prime the connection to the pressure sensor to eliminate any air bubbles.
Overhead Spray Nozzles
Rainfall onto the catchment area is provided by two rows of four spray nozzles (18)
above the tank, mounted on a support frame (24). The height of the spray nozzles
above the sand tank can be varied to optimise the demonstration by adjusting the
height of the support frame. This is achieved by withdrawing the spring-loaded
plunger (25) at each end, raising or lowering the support frame to the required height,
then re-locating the spring loaded plunger in the appropriate hole. One person at
each end of the equipment should hold the support frame while performing the
adjustment.
An isolating valve (19) upstream of each nozzle allows the pattern to be changed as
required. Since the flowrate through each nozzle is dependent on the pressure, if the
appropriate pressure regulator (12) is adjusted to give the required flowrate then the
flow through each nozzle will remain constant when other nozzles are turned on or
off. To achieve this the feed flow control valve (13) should be opened fully and the
pressure regulator adjusted to give the required flow through the nozzles.
The flexible tube from the arrangement of spray nozzles is connected to one of the
water feeds, when required, using the self-sealing quick release connector (15). The
height of the nozzles should be adjusted at the required flowrate to give adequate
coverage over the surface of the sand without excessive spray over the sides of the
sand tank as described above.
River Inlet Tank
A river inlet tank (17) mounted at the right-hand end of the sand tank allows a stream
of water to flow onto the surface of the sand, simulating the flow from a river
upstream. The river inlet tank is fabricated from stainless steel and is bolted to the
end wall of the sand tank adjacent to the shallow cut-out. Water enters at the base of
the tank, flows upwards through a bed of glass marbles (16) to minimise any
turbulence then flows sideways onto the surface of the sand through a rectangular
section.
An anti-erosion mat (small section of mesh) is supplied to reduce any local scour
where the water enters the sand tank. This mat is buried just beneath the surface of
the sand adjacent to the outlet of the river inlet tank.
The flexible tube from the base of the sand tank is connected to one of the water
feeds, when required, using the self-sealing quick release connector (15).
Summary of Contents for S12-MKII
Page 1: ...Advanced Environmental Hydrology System Instruction Manual S12 MKII ISSUE 21 February 2014...
Page 4: ......
Page 8: ...4 Equipment Diagrams Figure 1 Front View of S12 MKII Hydrology System...
Page 9: ...Equipment Diagrams 5 Figure 2 Plan View of S12 MKII Hydrology System...
Page 10: ...Armfield Instruction Manual 6 Figure 3 End View of S12 MKII Hydrology System...
