Each suspended solids monitor is fitted with a light source and two detectors for making the measurements. Having two detectors, positioned at different distances from the light source, allows the sensor to be used over a wide range of suspended solids concentrations. The light source is a long life infra-red LED emitter (providing for 15 years working life). The detectors are matched photodiodes that are positioned to detect backscattered light, which is light that is scattered by >90°. By measuring back scattered light the sensor can be used to detect low and high concentrations of solids. This configuration allows accurate and reliable measurements of suspended solids concentrations and turbidity to be made.

Calibration of the TSS sensor for turbidity measurements (NTU) or measurements of samples with low concentrations of solids is very easy, requiring a single calibration sample. This sample can either be a reading from another method, or a suitable standard. The analyzer calibrates the sensor by a procedure that reduces the light output through four stages, taking measurements at each. This process provides an accurate and reliable zero and span without the requirement to use a ‘0’ NTU/solids sample.

The calibration of the TSS sensor for the measurement of samples with high concentrations of solids uses a multi-point calibration for the most accurate results. Up to 5 calibration points can be used to give an accurate performance across a wide range of sample concentrations.

The TSS sensor can be mounted on the end of a pole for dip mounting in a channel or tank, or inserted into a pipe via a valve which allows for retraction/removal of the sensor without shutting down the process.

More Benefits

The Chemtrac suspended solids sensor is available with different controllers giving you the same great performance with different communication, display, and control options. With the Chemtrac range of online suspended solids analyzers, you get everything that you need – and nothing that you don’t, without sacrificing the quality of measurement.

The use of a single sensor to robustly and accurately measure a large dynamic range of suspended solids allows for:

• Less spares – more commonality across a single or multiple sites
• No requirement to know the range prior to specifying – easier purchasing
• One online suspended solids analyzer can be:
  • Online mlss meter
  • Online tss meter
  • Online total suspended solids meter
  • Online effluent monitor
  • Online inlet monitor
  • Online ‘in process’ suspended solids analyzer