| Mounting and Installation procedures / requirements |
The IRU-2000 series is available in two body styles. Both are easily mounted. The IRU-2100
has a 2" or 3" NPT on the front of the sensor for mounting, or for this application, a 1" NPT off
the back. The IRU-2000 is mounted by 4 screws or by mounting clamps. It is important to keep
the sensor perpendicular to the material being monitored. When mounting the sensor for stock
pile elevation, the sensor must be mounted below the conveyer arm. This is can be done either
by a bracket on the conveyer or off the conduit. If the sensor is mounted on the conduit, it is
important the conduit is anchored to ensure the sensor does not get out of alignment.
The LPU series of loop-sensors mounts using 2" NPT threads.
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| Wastewater in Quarries and Cement Plants |
This industry extracts and processes stones and earth. It also manufactures products for the
building industry. These include cement, lime and plaster as raw materials in their own right and
building ceramics and pottery such as bricks, fire clay, earthenware, tiles and abrasives.
Medium sized and large works usually discharge their wastewater without treating it. It contains
almost exclusively material that can be sediment, like gravel, sand, limestone or dolomite and is
usually collected and treated separately. Precipitation from roofs and other surfaces with
mineral dust or sand is taken to precipitation basins with wastewater from production areas. It is
often possible to return the water from here to production. If there is a danger of contamination
from carbohydrates, separators should be installed. An example of this is waste from workshops
or oil rig or other equipment decks.
There is generally no need for any treatment before the sedimentation of solids. The shape and
dimensions of the sedimentation tanks or basins depend on the way the particles settle as does
the retention time of the wastewater. Tanks are cleaned of sludge periodically, basins usually
not.
Addition of flocculating agents to material that takes a long time to settle can accelerate the
process. Belt type sludge filters or centrifuges usually drain the resulting sludge until it has a
water content of no more than 40% or 50% The dried sludge can usually be dumped without
any problems. Sludge containing insoluble heavy metals from dyes and enamel varnishes
should not be dumped, nor those that contain six-valent chromium compounds. The former
usually comes from ceramic manufacturers the latter from fiber cement producers.
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