DULCOZERO FCL - Safely monitor the absence of free chlorine

Fast response time, precise measurement, high process reliability
DULCOZERO FCL - reliable monitoring of the absence of free chlorine

Heidelberg, February 2025

Reliable monitoring of the absence of free chlorine is essential in numerous water treatment processes. The breakthrough of even the smallest concentrations of free chlorine can irreversibly destroy diaphragms in reverse osmosis systems and cause major damage. ProMinent GmbH has designed the panel-mounted monitoring system DULCOZERO FCL for these fields of application. Even after a long absence of free chlorine, it reliably alarms at the lowest chlorine concentrations and contributes to a high level of process reliability.

With DULCOZERO FCL, ProMinent has developed a special algorithm that logically links and evaluates the measurements of the Amperometric Sensors for Free Chlorine with the auxiliary measured variables pH and ORP. This minimizes possible interferences in the measurement and optimizes the reliability of breakthrough detection. A chlorine breakthrough is detected in less than three minutes at a low threshold from 0.02 mg/l and triggers an immediate alarm, even if chlorine has been absent for a long time.

With clear, uncontaminated water, the system only needs to be recalibrated after three months. This reduces process costs.

Wide range of applications

The complete system is suitable for monitoring the absence of free chlorine to protect the diaphragms in reverse osmosis processes for the treatment of drinking water, process water and waste water, or for the production of ultra-pure water in industrial processes. It is also suitable for the discontinuous operation of disinfection systems in drinking and cooling water treatment as well as in pool and wellness areas. For emergency chlorination of drinking water in the event of contamination, it reliably monitors the free chlorine.

One system, many advantages

For simple and space-saving wall mounting, all components of the DULCOZERO FCL are clearly arranged on a plate: the DULCOZERO DACb Controller for signal evaluation, a DULCOFLEX DF2a peristaltic pump, an emergency stop switch and a Modular BAMa sensor bypass fitting equipped with sensors for measuring free chlorine, ORP and pH, a flow switch and a dosing module. The calibration assistant of the DULCOZERO DACb controls the calibration and its sequence automatically. The calibration solution can be easily prepared on site. It is provided automatically via the integrated Metering System. This enables convenient calibration even in the absence of free chlorine in the process water. As the calibration intervals extend over several months, all components are low-wear and no chemicals are used to activate the sensor, maintenance and service costs are significantly reduced. DULCOZERO FCL can be integrated into the web-based ProMinent IoT platform DULCONNEX and will be available from the beginning of 2025.