Boiler Feedwater Treatment Chemical Injection (or Chemical Dosing)

  • For safe and efficient operation, the quality of feedwater, steam, and condensate in boiler plants must be controlled and maintained in the most favorable conditions.

    For reclamation drain from makeup water desalination systems and condensate desalination systems, and equipment washing wastewater in thermal power stations, as well as acidic or alkaline wastewater from desalinated water production plants, a treatment appropriate for the properties of the respective wastewater quality must be employed in addition to neutralization.
  • A flocculant is injected for makeup water treatment, and anti-corrosion agents such as a deoxidant and pH adjuster are also injected.
  • In areas where water supply is limited, industrial wastewater and domestic wastewater need to be treated and reused.

Water Quality Control Requires Water Quality to Be Measured with Various Sensors and Many Analog Inputs to Be Connected

Objects of Measurement:

  • Dissolved oxygen concentration
  • Dissolved oxygen saturation
  • Untreated water flow rate
  • Untreated water temperature
  • Chemical injection rate
  • pH
  • Untreated water turbidity
  • Electrical conductivity of untreated water

New Eight Analog Inputs

New: Eight Analog Inputs


Related Products & Solutions

2-Wire Transmitter/Analyzer FLXA202/21

The FLEXA™ series analyzers are used for continuous on-line measurements in industrial installations. With an option for single or dual sensor measurement, they are the most flexible two-wire analyzer available.

Multi Channel 4-Wire Analyzer FLXA402

The FLEXA™ series analyzers are modular-designed analyzers used for continuous online measurements in industrial installations. They offer single or multi-sensor measurement.



The YS1310 Indicator with Alarms is an input indicator that has alarms with two inputs. Two loops can be displayed simultaneously. A high limit alarm, low limit alarm, high-high limit alarm, and low-low limit alarm can be generated for each of the two inputs, and the AND connection or OR connection of arbitrary alarms can be output from a total of 6 contacts.


The YS1350 is a manual setter that allows for manually outputting setting signals to controllers and the like. The YS1360 is a manual setter that allows for manually outputting operation signals to operation terminals.


The YS1500 Indicating Controller incorporates fundamental control functions required for PID control. Necessary functions can be selected in accordance with the user's purpose.


The YS1700 Programmable Indicating Controller can be tailored for various applications by running a user program, and offers high reliability thanks to Yokogawa's proprietary technology, user friendliness, and expandability.

About OpreX

OpreX is the all-new comprehensive brand for Yokogawa’s industrial automation and control business. The OpreX brand stands for excellence in the technology and solutions that Yokogawa cultivates through the co-creation of value with its customers.


Have Questions?

Contact a Yokogawa Expert to learn how we can help you solve your challenges.