Measuring with Optical Dissolved Oxygen (DO) Probes 150
24.3.3. User‑assembled, top thread immersion installation
I
II
1
2
4
3
5
6
1 Cable gland
2 Pipe cap (socket connect or threaded)
3 Van Stone flange (one size smaller than the pipe)
4 2”, or similar, PVC pipe (schedule 80 PVC)
5
Reducer bushing
• internal thread to fit probe’s ¾” NPT threads
• external thread to fit pipe’s threads or socket‑
connect type
6 Optical DO probe
A. Wrap PTFE tape around the upper ¾” NPT threads of the probe (6).
B. Attach a user‑supplied reducer bushing (5) to the probe (6) upper threads (step I).
C. Feed the probe cable through length of NPT externally threaded, user supplied pipe (4), matched to
bushing.
D. Thread the pipe into the upper threads of the reducer (5) attached to the probe.
E. The upper portion of the pipe should be sealed (step II) to prevent ingress of water if installation is outdoor.
F. Attach the pipe to a handrail.
24.3.4. Low thread immersion installation
The HI60501 (PVC submersible holder) together with HI60501‑2 (protective end cap), and HI605011 (mounting
flange) provide a sturdy, protective housing designed for low thread immersion installation.
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