Hanna Instruments HI 9829 Instruction Manual page 84

The probe is suitable for measurements in a flow cell. Pumping water to a flow-
through monitoring station has obvious pros and cons. Typically a shelter is
required to secure a pump, and flow chamber. A power requirement, shelter,
pump maintenance and higher installation cost need to be considered. Freeze
protection, security, and convenience of calibration and possibility of adding
multiple measurement points and antifouling preconditioning systems are
advantages to this type of installation.
General Guidelines for fixed installation:
• Select a water-sampling site that will allow collection of representative water
samples.
• Position the probe so the sensor surfaces face toward the flow. This will
minimize air bubble or fluid cavitation. Limit flow rate to moderate
• Mount Probe 0 to 45° angle from vertical to avoid sensors (pH, pH/ORP,
ISE) from becoming electrically discontinuous due to internal electrolytes
flowing away from their internal cells.
• Install meter or probe where they will be accessible for maintenance as
required.
• Regularly visit water sampling sites to: check for damage to sensors, the
installation mountings, and the probe/meter battery power.
• Remove aquatic weed growth that may be interfering with water sample
collection.
• Set up devices and programs for water monitoring and sampling.
• If the probe is suspended from a pier or bridge ensure that it is protected
from debris by positioning behind a support and anchoring the cable /probe
to a pipe.
• Have access to spare sensors and proper range standard solutions or
buffers.
• Strictly follow the established SOP's.
• Download data to a laptop computer or meter on site.
• Flow cell installation; Avoid trapped air. Maintain constant flow rate.
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