Ph Probe Installation Considerations; Mounting The Ph Probe In The Stream - Teledyne TIENet 301 Installation And Operation Manual

TIENet® 301 pH/Temperature Device
Section 2 Installation and Setup for Signature
2.1.3 pH Probe Installation
Considerations
2.1.4 Mounting the pH
Probe in the Stream
2-6
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 be enough flow to submerge the sensing
end of the probe completely.
Note
For best results, calibrate the probe before each installation.
For calibration steps, refer to Section 2.4.
If flow is intermittent (dry for periods of time), the pH sensing
bulb will dry out, and its response time will slow, becoming espe-
cially problematic 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 become inoperable. Never let the
sensing end of the probe dry out completely.
Always mount the probe in an easily-accessible location, as
periodic cleaning of the probe will be necessary.
Also, you will eventually need to replace it. The probe can be
mounted facing either upstream or downstream, but the carrier
mounting is more secure if the probe is facing upstream, due to
the stop tabs on the back end.
Remember to unscrew the plastic guard cap from the sensing end
of the probe when you install it, or the probe will be unable to
sense the flow stream.
Installation in streams with high grease content will result in
poor performance and require frequent cleaning and recali-
bration.
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 probe operates satisfactorily mounted either horizontally
or vertically in the stream. However, horizontal mounting is
more secure, and presents less of a debris trap.
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
hang it by its cable. Suspending the probe in the stream is not
stable.
For horizontal mounting, the probe fastens to a sensor carrier
that snaps to an ISCO mounting ring. The carrier has spring
clamps that hold the probe in place. Press the probe between the
clamps, then push it backward until it stops.