Posted in | Water Quality Sensors

SoliSense® Monitor for Wastewater Treatment

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Pi’s SoliSense^® measures suspended solids concentrations from 2 NTU to over 8%. Its integrated sensor measures suspended solids from 2 NTU to 8% in wastewater and up to 50% in other solid types.

This device serves wastewater, potable water, mixed liquor suspended solids, return activated sludge, centrate, filtrate, sludge, and various other monitoring needs where a standard turbidimeter or suspended solids meter is typically utilized. The SoliSense^® TSS Meter features automatic cleaning that propels water or air across the optical windows, maintaining clarity.

The SoliSense^® range of TSS Meters is based on a patented Suspended Solids Meter solution.

Principle of Operation – No Zero!

Each SoliSense^® suspended solids meter is equipped with a light source and two detectors for taking measurements. Two detectors, positioned at varying distances from the light source, enable the TSS Meter to operate across a broad range of solids concentrations.

The light source is a durable infrared LED emitter, offering a 15-year operational lifespan. The detectors are paired photodiodes configured to sense backscattered light, specifically, light scattered beyond 90 degrees. Measuring backscattered light allows the TSS Meter to detect both low and high solids concentrations. This setup enables precise, dependable measurements of solids concentration (mg/L) and turbidity (NTU).

Calibrating the SoliSense^® for turbidity or low-solids-concentration samples is straightforward and requires only one calibration sample. This sample may originate from an alternative method's reading or a relevant standard.

The TSS Meter self-calibrates by incrementally lowering light output across four stages and recording data at each step. This method delivers precise and dependable zero and span values, eliminating the need for a '0' NTU/solids sample.

For high-solids-concentration samples, the SoliSense® uses multi-point calibration to achieve peak accuracy. It can use up to five calibration points, ensuring precise operation across diverse sample concentration ranges.

The SoliSense^® suspended solids meter can be pole-mounted for immersion in a channel or tank, or inserted into a pipeline through a valve, enabling sensor retraction or removal without process interruption.

Key Benefits

Best suited for all potable, waste, and process waters
Up to 12 months between maintenance
Stable and reliable – exceptional process control
Up to 12 months between calibrations
From 2 NTU to 8% Solids
Auto-clean optical sensor – months without maintenance
Displays in NTU, mg/l, g/l, or % solids – flexible

The SoliSense® suspended solids meter can integrate with different controllers to deliver the same high‑performance results while offering varied display, communication, and control options. With its advanced patented measurement technology, the system meets users’ requirements without additional accessories.

Using a single sensor to robustly and accurately measure a wide dynamic range of suspended solids enables:

Fewer spares – more commonality across a single or multiple sites
One online suspended solids meter can be:
- Tss meter
- Mlss meter
- Effluent monitor
- In-process suspended solids meter
- Inlet monitor
- Total suspended solids meter
No requirement to know the range prior to specifying – easier purchasing

Applications

The SoliSense^® suspended solids meter can be used in various wastewater treatment applications including

Effluent monitoring (suspended solids 0-1000 mg/l)
Inlet monitoring (turbidity 2-4000 NTU)

Traditional Monitoring Applications Where Pi TSS Meters are Particularly Suited

Thickened sludge – Total suspended solids meter
Wastewater Influent – Total suspended solids meter for turbidity
RAS TSS Meter (Return Activated Sludge)
WAS TSS Meter (Waste Activated Sludge)
Filtrate – Total suspended solids meter
MLSS Meter (Mixed Liquor Suspended Solids)
Suspended Solids Meter
Wastewater Effluent – Total suspended solids meter
Centrate – Total suspended solids meter

Each probe has two detectors and a light source. The light source is a long-life infrared LED emitter, with an ability to work for nearly 15 years.

By Using Two Detectors in a Single Probe it is Possible to:

Measure solids from 0.001 to 500 g/l (50% solids) – Silicates
Measure solids from 0.001 to 80 g/l (8% solids) – Sludge
Measure turbidity from 2 NTU to 4,000 NTU

The electronics deliver a fully scalable output, enabling the SoliSense^® to measure any portion - or the entire range - of the scale. The sensor probe uses an integrated water jet to clean optical lenses regularly. The system is suitable for applications ranging from low NTU to % solids. Up to five calibration points enable the system to accurately measure various sample concentrations.

The probes use sapphire optical windows and 316 stainless steel to withstand extreme operating environments. For solids monitoring at any point in a wastewater treatment plant, this instrument offers a self‑cleaning sensor and compatible accessories, ensuring reliable operation even where other instruments have failed.