Transcript Document

pH / ORP
Conductivity
Dissolved Oxygen
Chlorine
Standards
CONTROLS
Concerns in pH # 2:
Coating
of the
Glass
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IC Controls Quality Water Solutions for pH
R1.0 © 2004 IC CONTROLS
pH / ORP
Conductivity
Dissolved Oxygen
Chlorine
Standards
PROBLEM
In a pH electrode they are two key elements: the glass
and the reference. To be able to measure accurately
there can be nothing coating the surface of the
electrode.
When there is coating the electrochemical signal
between the glass and the reference decreases and the
sensor loses slope and becomes more sluggish. In the
process the sensor shows inaccurate results. When
calibrating the slope will deteriorate until the sensor
cannot be calibrated.
www.iccontrols.com
IC Controls Quality Water Solutions for pH
R1.0 © 2004 IC CONTROLS
pH / ORP
Conductivity
Dissolved Oxygen
Chlorine
Standards
CAUSE
In a number of applications there are constituents that
will coat the glass, such as Calcium Carbonate which is
present in systems where lime addition is used for effluent
neutralization. Coating of the glass causes poor contact
between the glass itself and the process. Good contact by
the electrode is essential for accurate speedy response in
the process. Thus, to help keep the glass clean and
responsive there are a couple of procedures that can be
used to help.
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IC Controls Quality Water Solutions for pH
R1.0 © 2004 IC CONTROLS
pH / ORP
Conductivity
Dissolved Oxygen
Chlorine
Standards
Two Cleaning Methods
75° to Flow
Chemical Spray Cleaning
www.iccontrols.com
IC Controls Quality Water Solutions for pH
R1.0 © 2004 IC CONTROLS
pH / ORP
Conductivity
Dissolved Oxygen
Chlorine
Standards
Chemical Cleaning vs
Turning Flutes 75° to Flow
In any application, the more mechanical pieces
there are, the greater the number of points of
maintenance and repair there are in the system.
IC Controls sensors are designed with two flutes
to allow self cleaning and therefore uses
NO mechanical cleaning, therefore, increased
reliability and reduced maintenance .
www.iccontrols.com
IC Controls Quality Water Solutions for pH
R1.0 © 2004 IC CONTROLS
pH / ORP
Conductivity
Dissolved Oxygen
Chlorine
Standards
Angling the Flutes
Insert the electrode with the flutes at 75° to flow, as seen
in the diagram on the next slide. By inserting the probe at
this angle a vortex will be created around the glass. The
vortex will increase the velocity of the process around
the glass and reference which will, in turn, hasten
electrode response time and also keep the reference
cleaner. As well, by turning the flutes to 75° the process
does not directly hit the glass which will slow down the
coating action.
www.iccontrols.com
IC Controls Quality Water Solutions for pH
R1.0 © 2004 IC CONTROLS
pH / ORP
Conductivity
Dissolved Oxygen
Chlorine
Standards
Vortex Action
www.iccontrols.com
IC Controls Quality Water Solutions for pH
R1.0 © 2004 IC CONTROLS
pH / ORP
Conductivity
Dissolved Oxygen
Chlorine
Standards
Vortex Action
www.iccontrols.com
IC Controls Quality Water Solutions for pH
R1.0 © 2004 IC CONTROLS
pH / ORP
Conductivity
Dissolved Oxygen
Chlorine
Standards
Angling the Flutes
No Mechanical Parts to Fail
Longer Sensor Life
Less Maintenance
Better pH Response
Proven Technology
Superior Design
Better Results
www.iccontrols.com
IC Controls Quality Water Solutions for pH
R1.0 © 2004 IC CONTROLS
pH / ORP
Conductivity
Dissolved Oxygen
Chlorine
Standards
Chemical Spray Cleaning
In application where the flow is stagnant or not
linear angling of the flutes may not provide
adequate cleaning. In these applications a
chemical spray cleaner can be attached to the tip
of the pH sensor. Mounting the spray cleaner on
the tip allows timed intervals of automatic cleaning
without operator handling or maintenance. Spray
cleaning also allows choice of the best chemical
for cleaning the pH sensor and improving
response.
www.iccontrols.com
IC Controls Quality Water Solutions for pH
R1.0 © 2004 IC CONTROLS
pH / ORP
Conductivity
Dissolved Oxygen
Chlorine
Standards
Chemical Spray Cleaning
The cleaning tip will spray
a chemical at the tip of the
sensor at timed intervals.
This reduces the amount of
manual cleaning required
and saves time. However,
when the chemical is not
being sprayed an air
source should be used in
the cleaning line to ensure
the process does not clog
the injection ports of the
cleaning nozzle.
www.iccontrols.com
IC Controls Quality Water Solutions for pH
R1.0 © 2004 IC CONTROLS
pH / ORP
Conductivity
Dissolved Oxygen
Chlorine
Standards
Chemical Spray Cleaning
Reduced Operator Handling
Longer Sensor Life
Less Maintenance
Better pH Response
Proven Technology
Superior Design
Better Results
www.iccontrols.com
IC Controls Quality Water Solutions for pH
R1.0 © 2004 IC CONTROLS