Forbes Marshall - Trusted Partners in Steam Engineering & Control Instrumentation
Forbes Marshall - Trusted Partners in Steam Engineering & Control Instrumentation

Turbidity Analyser FMSC-T3

Managing variable turbidity in massive clarifiers and filter backwash cycles requires a system that is both incredibly fast and resilient. The FMSC-T3 serves as the intelligent core, interfacing with robust stainless-steel sensors (FMTC-100, 500, or 3000) depending on your range requirements. Utilising an 860 nm optical light attenuation method, this system bypasses common errors caused by direct sunlight or internal chamber reflections. The sensors feature a heavy-duty swing wiper that cleans both sides of the sapphire glass, executing a clearing operation immediately upon power-up and at regular intervals to guarantee flow-independent precision.

Applications of FMSC-T3:

Automating filter backwash cycles to save pure water, monitoring raw water influents, preliminary treatment stages, and overseeing aeration basins or final filtration in waste water plants.

  • Broad Measurement Range: Interchangeable sensors accommodate 0-100, 0-500, and 0-3000 FTU ranges
  • Dual-Sided Swing Wiper: Aggressively clears bio-fouling from both sides of the optical pathway, ensuring continuous reliability
  • Optical Attenuation Method: Uses 860 nm light attenuation, ensuring measurements are independent of color and ambient light interferences
  • Lightning-Fast Response: Delivers process changes in less than 5 seconds, allowing immediate ON/OFF control of filter backwash sequences

Frequently Asked Questions

What is the difference between EPA and ISO 7027 turbidity compliance?

EPA compliance (used in the FMTSC models) relies on the 90-degree scattered light method, which is the standard for regulatory environmental reporting in many regions. ISO 7027 compliance (found in the FMTC-Mi100) utilises an LED light source for nephelometric measurement, which is highly preferred for colored water and specific global drinking water standards.

How do Forbes Marshall turbidity sensors stay clean in dirty wastewater?

The sensors are equipped with built-in automatic wiping systems. For instance, the FMSC-T3/FMTC sensors utilise a swing wiper on both sides of the lens, while the FMTSC series uses an automatic rotary wiper system with programmable cleaning intervals to scrub away fouling.

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