139 Measuring with Galvanic Dissolved Oxygen (DO) Probes
23.2. GENERAL INSTALLATION CONSIDERATIONS
• Probes are easily installed using the ¾” NPT external threads.
• Do not install the probe in an upside‑down position.
•
Hand tighten the probe in position. Then, depending on the process, tighten one or two turns with a wrench
to secure in place. Do not exceed the 10 N•m (7.3 lb‑ft) torque specification for the probe sensor.
•
The sensor consumes oxygen. Ensure an adequate water movement of around 0.03 m/sec. past the sensing
area, regardless of installation type, to avoid local depletion of oxygen and erroneously low readings.
•
The membrane should stay wetted to prevent water vapor crossing the membrane and depleting electrolyte.
•
Protect the probe and membrane from strong flow to prevent unstable readings. In turbulent aeration basin
installations, place the probe in a weir for more accurate readings.
• Protected the membrane from blunt objects.
• Keep the membrane clean to allow free exchange of oxygen.
• Avoid fast flow rates (risk of cavitation) and slow flow rates (risk of oxygen depletion).
• Provisions must be made for the removal of the probe from the process.
• Consider probe accessibility for maintenance when selecting placement.
Note: See galvanic DO industrial probes manual (MAN7640-18) for series configuration options and detailed
specifications.
23.3. INSTALLATION SCHEMES & MOUNTING ACCESSORIES
Accessories are sold separately!
23.3.1. Probe dimensions
3/4’’ NPT 3/4’’ NPT
Ø 17 mm (0.7”)
165 mm (6.5”)
53 mm (2.0”)
30 mm (1.2”)
Figure 68: HI7640‑18zz galvanic DO probe with attached cable
178 mm (7.0”)
Figure 69: HI7640‑1800 galvanic DO probe with DIN connector
23.3.2. Probe Connection
Align the pins and key, then push the plug into the socket.
Rotate the collar to lock in place.
Note: Probe connection (probe with integral DIN connector) and probe wiring (probe with attached cable)
must be carried out with the controller disconnected from power.
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