An automated chemical dosing pump system for cooling towers is an intelligent setup designed to precisely and automatically inject various treatment chemicals into the circulating cooling water. Unlike manual dosing, which is prone to human error, inconsistencies, and potential over/under-dosing, an automated system ensures optimal chemical concentrations, leading to better water quality and system protection.

Sensors continuously monitor critical water parameters in the cooling tower sump or recirculation line. Common sensors include:

Conductivity/TDS (Total Dissolved Solids) Sensor: Measures the concentration of dissolved salts, indicating the level of concentration in the cooling water. This is often used to trigger blowdown (discharge of concentrated water) and subsequent chemical dosing.

ORP (Oxidation-Reduction Potential) Sensor: Primarily used for monitoring disinfectant levels (e.g., chlorine, bromine) to ensure adequate microbiological control.

pH Sensor: Monitors the acidity or alkalinity of the water, crucial for corrosion control and optimizing the effectiveness of certain chemicals.

Controller/PLC (Programmable Logic Controller): This is the “brain” of the system. It receives real-time data from the sensors, compares it against pre-set parameters (setpoints), and then activates the dosing pumps or blowdown valves as needed. Modern controllers often feature:Proportional Control: Adjusting the dosing rate based on the deviation from the setpoint.

Timer-Based Dosing: Scheduled dosing for certain chemicals or Flow-Proportional Dosing: Dosing based on makeup water flow or blowdown volume.

Alarm Functions: Alerting operators to deviations or low chemical levels.

Data Logging and Remote Monitoring: Providing historical data and allowing for remote access and control.