B - Probe Deployment - Hanna Instruments HI 9829 Instruction Manual

APPENDIX B - PROBE DEPLOYMENT
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
growth that may be interfering with representative water samples.
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