Hanna Instruments HI98194 Instructions Manual page 60

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 mea‑
surement 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) from becoming
electrically discontinuous due to internal electrolytes flowing away from their internal cells.
• Install meter and 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 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.
• Flow cell installation; Avoid trapped air. Maintain constant flow rate.
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