reagents require time for reaction, therefore,
there is usually a lag time in response.
Galvanic measurement does not require
reagents, allowing for reduced stock and
maintenance costs.
➢ No mechanical parts: Galvanic direct
measurement does not require reagent addition
or sample mixing, so there is no need for
additional pumps, tubing etc. which also
reduces the maintenance required.
➢ No response lag time: Reagents need to be
pumped into the sample chamber and thus
require time to react with the sample prior to a
measurement being taken, therefore,
measurement is not instantaneous as with the
direct method.
Sample systems
All of the IC Controls free chlorine analyzers are
available as complete sample conditioning
systems. The 875, 876 or 877 is mounted on a
stainless steel panel with a flow cell containing the
appropriate sensors. The sample conditioning
system includes a pressure regulator valve, head
tank, sample point and atmospheric drain. The
only installation requirement of the user is to
provide plumbing to inlet and outlet. Summary
There are a variety of methods available for
monitoring free available chlorine; IC Controls
provides two different measurement methods.
Overall, it is important to note the differences in
the two types of monitoring techniques and thus
where to use each system for best chlorine control.
The pH/ORP method is best used in systems such
as cooling towers or potable water, where the
baseline ORP is consistent and the pH is an
important component of good control.
Conversely, the galvanic sensor is best in
situations where the water composition is not
stable and/or continuously changing.