4230 Flow Meter
Section 4 Optional Equipment
4-15
you select 4 & 7, the following will appear. Calibration with the
other menu options (7 & 10 or 4, 7, & 10) is essentially the same
as shown below. For the other menus, see Section 2.
When the probe has stabilized, press Enter and the following
display will appear:
When you have entered this second value, the pH probe cali-
bration is complete. You can then install the probe in the flow
stream.
4.8.3 pH Probe Installation
Guidelines
Installation of the pH probe is similar to the submerged level
sensor, other parameter probes, and the area-velocity sensor.
• Install the probe only in streams that have continuous
flow. The sensing end of the probe must always remain
wet.
• For proper operation, there must also be enough flow to
submerge the sensing end of the probe completely.
If flow in the stream is intermittent (dry for periods of time), the
pH sensing bulb will dry out and its response time will slow. This
is a problem in situations where pH changes rapidly. If the probe
is dry long enough, it will first lose sensitivity, then be slow to
respond, and finally be ruined. Never let the sensing end of
the probe dry out completely.
• Installation in streams with high grease content will
result in poor performance and require frequent
cleaning and recalibration.
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
RINSE PROBE AND PLACE IN 7.0 pH SOLUTION
PRESS ENTER WHEN STABLE: X.XX pH
RINSE PROBE AND PLACE IN 4.0 pH SOLUTION
PRESS ENTER WHEN STABLE: X.XX pH
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