Hanna Instruments HI 9829 - Manual (Page 85)

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The Hanna HI 76X0929 has been designed for a variety of water quality
measurements both in situ or in active deployments in urban or natural
waters. The HI 9829 systems may be used for discrete spot sampling with a
meter and the meter’s log on demand function, unattended with continuous
monitoring and logging from the meter, or unattended using a logging probe.
These data are then downloaded to a meter or PC and can be plotted with
logging software to obtain the graphical log needed for interpretation of the
essential physical property of the aqueous body of water. In all of these
deployment situations data quality is dependent upon the site location, service
intervals, amount of coatings, sedimentation and vegetation, and the actual
installation. The probe may be installed in a horizontal bank (fixed installation)
or a vertical suspension. The maximum depth rating of 20 m (65’) for the probe
should be adhered to. (Note: actual sensor specifications may be less). The
location must be accessible for the duration of the measurement (consider
seasonal flooding, freezing and other acts of nature) when selecting a site. Many
conditions may affect the quality of measurements. Select an installation site
that is representative of the water body being monitored. Avoid areas without
adequate water circulation. To protect equipment it is best to avoid exposure to
wind, foam, turbulence, air temperature gradients/sun, extended periods of high
flow, extended periods of high sediment and floating debris. The standard
operating procedures (SOP) for the data gathering must be upheld. This typically
includes pre and post deployment checks of the sensors to validate data gathered
between calibrations, upholding service intervals, and following any other site-
specific procedures. Grab samples for laboratory analysis or spot sampling with
another probe are addition ways to validate the measurements taken by
unattended continuous logging probes.
The probe is suitable for installation in confined locations such as air vaults,
river intakes, vertical wells, tanks, etc.. The streamline diameter of the probe
permits insertion into 2" pipelines. Unlike probes that require a cable support for
active deployments the probe can be manually lowered and raised by the cable
due to it’s superior strength member.
It is suitable for installation in open moving waters; rivers, streams, ditches
(farmland drainage), conveyance canals, etc.. In these cases protecting the probe
from debris is important. If the probe is suspended from a pier or bridge position
it behind a support and anchor the cable/probe to a pipe.
It is suitable for deployment in open waters; monitoring lakes, ponds, wetland
basin, infiltration basins, bays. Schedule regular service to remove aquatic weed