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APPENDIX B - PROBE DEPLOYMENT
The Hanna Instruments
HI769819X
have been designed for a variety of water quality measurements
both in situ or in active deployments in urban or natural waters.
The
HI9819X
systems may be used for discrete spot sampling with log on demand function or,
continuous monitoring and logging. These data can be downloaded to a PC and 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 logs.
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 growth that may be interfering with
representative water samples.
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