MANUAL
CT
Controllers
INTRODUCTION
Page 5
CHAPTER I - INTRODUCTION
CHEMTROL®
AUTOMATION
Congratulations on your selection of a CHEMTROL®
CT
Controller
Programmable Controller for your water treatment
facility.
CHEMTROL® Automation uses the most advanced electronic
sensing technology to monitor and control the critical
parameters for water treatment, i.e. conductivity, pH,
Oxidation-Reduction Potential (ORP) and temperature. Also
available is monitoring of flow rates for make-up and bleed
water and influent/effluent filter pressures.
This Instruction Manual covers the following models:
-
CHEMTROL®
CT110
with conductivity
/TDS
control, pH
control
option, ORP control option, Temperature monitoring,
fill and
bleed water flow programs, and three additives
programs
.
-
CHEMTROL®
CT3000
with Conductivity
/TDS
control, pH
control,
optional ORP control, Temperature monitoring, fill
and bleed
water flow programs, and four additives programs.
-
CHEMTROL®
CT6000
with Conductivity
/TDS
control, pH
control,
ORP control, Temperature monitoring, fill and
bleed water
flow programs, four additives programs, water
level program,
influent and effluent filter pressures, and
automatic filter
backwash.
Webserver remote operation is available on all models.
Use the appropriate sections in the manual for each model.
Water Maintenance
The primary purpose of water treatment is protection of the
equipment from the aggressiveness of water and prevention of
bacteriological growth.
The guidelines for
Commercial water chemistry controllers
include the following:
•
Conductivity
typically
below
5,000
µ
S/cm
-
corresponding to Total Dissolved Solids (TDS) of less
than 2,500 ppm (mg/l) - to prevent precipitation of
dissolved salts and corrosion products,
•
pH between 7.0 and 9.0, depending on chemical
treatment, to prevent scaling or corrosion,
•
Oxidation-Reduction Potential (ORP) above 650 mV
to prevent algae growth and growth of bacteria, such
as Pseudomonas, E. Coli, etc.,
•
proper water balance with Langelier Saturation Index
values between 0 and 0.3 for untreated waters, or up
to 2.0 - for waters treated with phosphonates and/or
polyacrylates,
•
adequate filtration with a maximum turnover rate of
six hours.
Reference Manuals
For more information on water treatment, see the Maintenance
section in this Instruction Manual or refer to one of the
following reference manuals:
-
“The NALCO Water Handbook”
Frank N. Kremmer, R.R. Donnelley & Sons Co.
-
“Water Treatment - Industrial, Commercial and
Municipal”
D.
C. Brandvold, DCB Enterprises, Inc.
-
“The Chemical Treatment of
Commercial water
chemistry controllers
”
James W. McCoy, Chemical Publishing.
-
“
INDUSTRIAL
W
ater Chemistry and Treatments,
CTI.
Table I - TYPICAL TREATMENT VALUES
TYPICAL WATER TREATMENT FOR
CHEMTROL water chemistry controllers
TEST
MIN
IDEAL
MAX
CONDUCTIVITY,
µ
S/cm
5,000
TDS, ppm
2,500
pH
7.0
8.5
9.0
ORP, mV
650
750
LANGELIER
SATURATION INDEX
0.0
2.0