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Hach Launches RTC101 P-Module for Phosphorus Control
Product News

Hach Launches RTC101 P-Module for Phosphorus Control

Hach Launches RTC101 P-Module for Phosphorus Control
Product News

Hach Launches RTC101 P-Module for Phosphorus Control


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While some facilities adjust their chemical dose based on flow or by setting a fixed dose rate, being able to quickly adjust for loading changes can significantly lower chemical costs. With inconsistent phosphorus levels in the effluent, the volume of sludge produced can also increase.  

“Before we installed the RTC101 system, we maintained an average ferric chloride dose of about 12.5 gallons per hour.” Rob M., a utility foreman from Wisconsin said. “After installation, the average feed dropped to 5.55 gallons per hour, saving us just over 50% in ferric chloride costs.”

"What makes the RTC101 so efficient in optimizing phosphorus levels is its pre-programmed algorithms.” Bob Dabkowski, Applications Development Manager at Hach said. “They are designed to determine the exact loading of phosphorus in a facility’s influent water, allowing for automatic dosing to what is needed.”

Hach’s RTC101 P-Module Phosphorus Control System is a turn-key solution with instruments and technology designed to work together, accurately controlling a facility’s phosphorus levels to save on chemical costs, and providing confidence in the phosphorus results produced.

The RTC101 can be used for both open (feed forward) and closed loop (feed back) control of the chemical dose. The chemical feed pump is controlled continuously via a 4-20 mA signal or a dry contact relay. Both outputs can be utilized together: if the dose determined by the controller is below the pump minimum flow rate, the system will switch from 4-20mA control to relay control automatically. And if the phosphate or flow input is disrupted, the RTC101 P-Module automatically refers back to previously created profiles to ensure that effluent compliance is maintained until the signal is restored. 

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