• Conductivity control
• pH control
• Temperature display
• Additive programs
• Remote alarm
• RS-232 communications port.

As shown above, the CHEMTROLCT2000 Programmable Controller monitors both the conductivity and the pH of the water with electronic sensors. It automatically controls the bleed solenoid valve, adds the proper amount of corrosion inhibitor proportionally to make-up water flow, and feeds two biocides on alternate weekly schedules.

SATURATION & WATER BALANCE Proper control of saturation and water balance is required to maintain water quality and to avoid the development of scaling or corrosive conditions. The CONDUCTIVITY sensor monitors the concentration of dissolved solids by measuring the conductivity of the water, displayed either in conductivity units (microsiemens/cm) or in parts per million of Total Dissolved Solids (TDS). Based on the information provided by the sensor, the controller automatically controls the BLEED VALVE to maintain the cooling water total dissolved solids within a user-defined range. To avoid the development of corrosion, scale, or microbiological organisms and to limit the amount of suspended solids, ADDITIVES - such as inhibitors, biocides, dispersants, etc. - are frequently added to the cooling water system. Development of scaling or corrosive conditions are detected by automatic calculation and display of the water LANGELIER SATURATION INDEX, based on available sensors inputs and manual data entry for Alkalinity and Calcium Hardness.

CHEMICAL AUTOMATION More recently, cooling tower operators have become aware of the dangers caused by the presence of germs and bacteria in the water. Most dangerous are A. Pseudomonas which can cause the fatal Legionaires' disease. These can be prevented by the injection of oxidizing sanitizers or biocides controlled by ORP. Indeed, numerous studies by health departments all over the world have shown that the Oxidation-Reduction Potential (ORP or Redox) generated by an oxidizing sanitizer, such as chlorine or bromine, is the most reliable indicator of both sanitizer activity and sterilisation of germs and bacteria - far superior to conventional test kit measurements. CHEMTROLTM CT Series controllers also offer pH monitoring and control to automatically add the proper amounts of acid and/or base.

FLOW/PRESSURE MONITORING & CONTROL CHEMTROLTM CT3000 and CT6000 controllers have the capability to integrate the flow rates and cummulative volumes of up to two water lines (typically make-up and bleed) by connecting reed-switch or hall-effect water flowmeters, as well as control a solenoid valve on the make-up line to automatically add water to the system using an optical level sensor. Monitoring of the influent/effluent pressures at the heat exchanger is also available to monitor scale build-up.

FILTER BACKWASH CONTROL When filtration of the cooling water is required to maintain clean and clear water, The CHEMTROLCT6000 Integrated Controller includes manual or programmable operation of the backwashing cycle using data input from the influent and effluent pressure transducers. Automatic backwashing can be applied to one or more filters with programmable sequencing, adjustable backwash and advance time for each filter.

A FULLY INTEGRATED CONTROLLER Water treatment for swimming pools, spas and industrial applications requires the combination of a number of physical and chemical processes, including pumping, filtration, chemical treatment, heating and water replacement. Because the processing equipment is made by different manufacturers and controlled individually, installation and operation of the system is complicated and inefficient.

The CHEMTROL CT6000 controller incorporates command of all the operating functions for monitoring, control and communications into a single integrated command center designed around a powerful microprocessor. The integrated Main Screen display enables the operator to supervise all the process functions at a glance and to quickly respond to any changing condition. The CHEMTROL CT6000 controller operates like a computer with full-screen displays and direct access to all menus and submenus. The front panel keypad is used to move up and down each menu and enter or exit the submenus. All operating functions can be easily modified from the keypad, including sensor calibration, control setpoints, alarm levels and the programs for superchlorination, sequential backwashing, chemical saving and energy saving. With the communications package, all facilities can be monitored either by remote computer or by telephone. This allows real-time supervision by management and remote troubleshooting by a CHEMTROL Qualified Dealer or by the factory support department. The remote operation option features true duplex remote control by PC computer under Windows software, including bakground operation while running other programs. The voice telephone option includes status reports, operational control and automatic callout with voice message to up to three different phone numbers in case of emergency.

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A FULLY PROGRAMMABLE CONTROLLER The CHEMTROL CT3000 controller is a fully programmable controller designed for complete chemical automation (Conductivity, pH and ORP) as well as control of chemical additives (inhibitors, biocides, dispersants, etc.), water level, and influent/effluent pressures in cooling towers, boilers, and waste water, all with full remote duplex capability. The user-friendly eight-line Main Screen display enables the operator to supervise all the process functions at a glance and to quickly respond to any changing condition with choice of operating language (English, French and Spanish) and units (US or metric). Entries are made on the 16-key keypad on the front panel. Each unit is supplied with a full 40-page instruction manuals with schematics of installation and menu flow charts. All CHEMTROL controllers are covered with a FIVE-YEAR electronics warranty backed up by our network of factory-trained Qualified Dealers. The CHEMTROL CT3000 controller includes the following standard features:

• Conductivity/TDS control with choice of bleed programs.
• pH control with automatic acid and base feed.
• Temperature monitoring.
• Flowrate monitoring and totalizer on make-up and bleed lines.
• Automatic calculation of the Langelier Saturation Index (LSI) for water balance.
• Six separate feed programs for all 4 chemical additives (inhibitor, biocide, etc.)
• manual
• bleed-and-feed
• bleed-then-feed
• cycle timer
• percent of make-up flow
• daily schedule
• "Booster" chemical feed program to schedule a delayed one-time feed event
• Low chemical level alarm (based on accumulated run time of feed outlet)
• Dynamic probe testing with sensor failure warning.
• Automatic probe rinse program to clean sensors.
• Differential signal amplification for added stability.
• Choice of 1,2 or 3-point calibration for all sensors.

• ORP monitoring and control for oxidizing sanitizer and biocides.
• Automatic water level control with optical sensor
• Influent and effluent pressure monitoring at the heat exchanger.
• Data logging of key parameters with adjustable intervals.
• RS232 port for on-site serial communications.
• True duplex remote computer operation with WindowsTM graphic display.

• Filter control with choice of backwash programs.

A SOPHISTICATED CONTROLLER The CHEMTROL CT2000 controller is a simple but sophisticated programmable controller designed for control of conductivity, pH and chemical additives - such as inhibitors, biocides, dispersants, etc. - in cooling towers, boilers, and other industrial applications. It is easy to install and operate. All menus are displayed on a large four-line LCD graphic display screen with choice of operating language (English, French or Spanish) and units (US or metric). Entries are made on the 16-key keypad on the front panel. Each unit is supplied with a comprehensive 40-page instruction manual with schematics of installation and menu flow charts.
All CHEMTROL controllers are covered by a FIVE-YEAR electronics warranty backed up by our network of factory-trained Qualified Dealers. The CHEMTROL CT2000 controller includes the following standard features:

• Conductivity or TDS control with choice of bleed programs.
• pH control with automatic acid or base feed (not included in CT2000C model).
• Temperature monitoring.
• Automatic calculation of the Langelier Saturation Index (LSI) for water balance.
• Six separate feed programs for up to three (3) chemical additives (inhibitor, biocide, etc.)
• manual
• bleed-and-feed
• bleed-then-feed
• cycle timer
• percent of make-up flow
• daily schedule
• "Booster" chemical feed program to schedule a delayed one-time feed event
• Low chemical level alarm (based on accumulated run time of feed outlet)
• Dynamic probe testing with sensor failure warning.
• Differential signal amplification for added stability.
• Choice of 1,2 or 3-point calibration for all sensors.

• Data logging of key parameters with adjustable intervals.
• RS232 port for on-site serial communications.
• Remote computer operation in true duplex mode with graphic display of data under WindowsTM.

• ORP control for oxidizing sanitizer or biocide.
• Automatic probe rinse program to clean sensors.
• Flowrate monitoring and totalizer on make-up and bleed lines.
• Automatic water level control.
• Influent and effluent pressure monitoring at the heat exchanger.
• Filter control with choice of backwash programs.

The CHEMTROL CT2000 controller operates like a computer with multi-line screen displays and direct access to all menus and submenus. The front panel keypad is used to move up and down each menu and enter or exit the submenus. All operating functions can be easily modified from the keypad, including sensor calibration, control setpoints, alarm levels and the different feed programs. With the Remote Operations feature, all facilities can be monitored by remote computer. This allows real-time supervision by management and remote troubleshooting by a CHEMTROL Qualified Dealer or by the factory support department. The remote operation option makes it possible to control all operating functions from a remote PC computer. NOTE: The voice telephone communications option is available on the CHEMTROL CT3000 and CHEMTROL CT6000 Controllers.

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