Industrial Boiler Blowdown Control Using On-Line Conductivity

November 2019, MARIETTA, GA ~ Conductivity, sometimes expressed as ppm TDS (parts per million total dissolved solids), is the method used to monitor mineral concentration. Many industrial boilers use periodic grab sample conductivity measurements and manual setting of the blowdown rate. This results in large swings in mineral content between grab sample measurements caused by changes in boiler load, make up water quality, etc. that can cause periods of scaling, corrosion or excessive blowdown.

A much improved strategy uses a continuous on-line conductivity measurement and automatic blowdown control to maintain consistent mineral concentration and minimize corrosion and scaling under all conditions. The Mettler Toledo Boiler Conductivity Sensor with its high temperature/pressure rating allows continuous measurement directly in the blowdown line without the expense of a sample cooler or cooling water flow for samples up to 250 psig (17 bar) at 392 °F (200 °C).

The Mettler Toledo Boiler Sensor combined with a M300 transmitter, provides a continuous, accurate conductivity measurement with readout in µS/cm, mS/cm or ppm TDS. The transmitter can be located up to 200 ft (61 m) away from the sensor and retransmit alarm, control and/or analog signals even further. Automatic blowdown control allows close management of boiler water quality and usually reduces the amount of blowdown, saving a significant amount of energy.     

Features Overview

  • Minimize corrosion & scaling with highest accuracy measurement and consistent blowdown control
  • Reduce energy costs with continuous monitoring & automatic control
  • Save operations costs by direct measurement without sample cooler & cooling water
  • Install with flexibility of in-line mounting or side-stream flow housing
  • Use with versatile Thornton analog transmitters with choice of built-in control options

Boiler Water Conductivity Sensor Specifications


To request additional information please contact FLW Southeast