4210 Flow Meter
Section 4 Optional Equipment
4-15
Greasy substances, being nonconductors of electricity,
weaken the electrical potentials formed between the
glass mono-electrode and the solution, slowing or
halting the response altogether.
• The pH Sensor operates satisfactorily mounted either
horizontally or vertically in the stream. However,
horizontal mounting is more secure, and presents less of
an barrier to trap debris.
• Simple suspension of the probe is not recommended,
particularly in streams of high velocity, or those that
carry debris.
If you mount the pH probe vertically, mount it securely. Do not
just hang it from the top of the pipe by its cable. Suspending the
probe in the stream is not stable.
For horizontal mounting, the probe fastens to a sensor carrier
that snap-fits to an Isco mounting ring. The mounting rings fit
various diameters of round pipes 15" diameter and smaller. For
larger pipes, use the Isco Scissors Ring. For installation details,
refer to the instruction sheet supplied with the mounting ring.
The mounting rings are held in place by the outward force of
spring pressure in the smaller sizes and by a scissors
arrangement in the larger sizes. After mounting the probe in the
ring or strap, route the cable out of the stream so it will not trap
debris or clog the sewer.
Mount the 201 Module within 25 feet of the probe, but in a
location higher than the highest anticipated level for the flow
stream. The amplifier box is sealed and will withstand tem-
porary submersion, but this should be avoided.
Note
When installing the pH probe and its sensor carrier, make sure
the mounting slots on the carrier are completely pressed into
the mating tabs on the ring. The probe relies on a full engage-
ment between tabs and slots for secure mounting. If the slots
are loose against the tabs, the probe may be swept away by
the force of the stream.
• Always mount the probe in an easily-accessible location,
because you will need to service it (cleaning) from time
to time.
Also, you will eventually need to replace it. You can
mount the probe facing either upstream or downstream,
but Isco recommends facing upstream, as there is a stop
on the sensor carrier that is not effective when the probe
is facing downstream.
• Remember to unscrew the rubber guard cap from the
sensing end of the probe when you install it, or the probe
will be unable to sense the flow stream.
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