141 Measuring with Galvanic Dissolved Oxygen (DO) Probes
A. Wrap PTFE tape around the probe’s (6) top ¾” NPT threads.
B. Attach a user‑supplied reducer bushing (5) to the probe’s (6) top threads (step I).
C. Feed probe cable through length of NPT externally threaded, user supplied pipe (4), matched to reducer.
D. Thread the pipe into the upper threads of the reducer (5).
E. Seal the top part of the pipe (step II) to prevent ingress of water if installation is outdoor.
F. Attach the pipe to a handrail.
Note: Use a bracket or a user-supplied elbow-threaded fitting (to the pipe) to orient the probe such that the
membrane cap is facing the incoming flow.
23.3.5. Flow‑cell installation
• Position the probe so that it does not trap air bubbles at the membrane cap.
•
Adjust the flow rate to around 150 L/hour (40 gallon/hour) to provide the DO sensor with the required
water movement.
•
The circulation pipes (from the tank to the flow‑cell) must be thermally insulated. Avoid temperature
differences greater than 2 °C (36 °F) between tank content and flow‑cell sample.
• Shade the assembly from direct sunlight.
• Do not allow deposits to accumulate within membrane area.
TANK
VALVE 1
VALVE 2
FLOWFLOW
INCOMING FLOW
EXIT FLOW
3
1
2
4
5
7
6
6
FLOW CELL
1 Process controller
2 Wiring cable
3 DO probe
4 Flow‑cell adapter
5 Flow cell
6 Flow‑cell valves
7 Saddle
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