New suspended solids analyser for water

Louise Smyth

The measurement of suspended solids (turbidity) in water is critical in a wide range of treatment applications, especially in municipal services. Suspended particles in water are typically clay and silt, and they give a cloudy or hazy appearance in sampled water. Such particles can become homes for bacteria and viruses that attach themselves and are a danger and generally indicate a lower overall quality of treated water.

The TR86 Turbidity Analyser features an advanced transmitter combined with ECD’s sophisticated T80 Universal Analyser. Together they provide reliably accurate turbidity monitoring with the capability to add a second measurement parameter to the system, such as pH, ORP, conductivity, DO or various pIONs.

Users will find the flexible TR86 comes in a choice of three separate ranges from 0 to 4000 NTU for continuous measurement. The TR86’s advanced IR optical sensing technology emits an 850nm beam of near infrared light into the sample where it is scattered by the particles suspended in the water. Measurement is achieved when the amount of scattered back light returns to the sensor, which is then correlated to the amount of suspended solid particulates.

The TR86 sensor’s measurement response time depends on the size, shape and composition of the suspended particles. This requires that mg/L, ppm and % suspended solids must be calibrated with the monitored sample. Turbidity measurements (NTU, FNU) can be calibrated with calibration standards such as Formazin, StablCal or SDVD beads.

It is accurate to 2% of reading, or 0.5NTU, whichever is greater. The sensor features built-in temperature compensation to ensure accuracy and operates over a wide temperature range from 32 to 122°F (-5 to 50°C) and at pressures up to 50 psi maximum in a flow cell configuration.

The Analyser can be set up in minutes by a technician without special tools or extensive product training. All that is necessary is a 1-inch stand pipe for immersion service or with ECD’s PVC flow cell for an in-line flow through application.  Either the side-mount or front-mount configuration of the TR86 sensor is suitable for immersion service. The side mount configuration must be used for in-line service.

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