NBL-WQ-TSS-4S Suspended Solids Sensor RS485 | NiuBoL

Quick Answer: The NiuBoL NBL-WQ-TSS-4S online suspended solids sensor uses scattered light to provide a continuous solids indication in water. Its 0-2000 mg/L range is useful only when it covers the actual stream and its optical response has been compared with a suitable reference. RS485 Modbus RTU is available; a 4-20 mA output is an ordered option.

NBL-WQ-TSS-4S: What the Online Suspended Solids Sensor Measures

The probe illuminates the water and detects light scattered by suspended particles. Internal calibration converts that optical response into a concentration value. This provides an ongoing record between samples, but it is not a miniature gravimetric laboratory inside the probe. Particle size, shape, colour and distribution affect the relationship between light and dry solids mass.

Use the channel to follow a defined process stream: for example, treated effluent, circulating process water or a suitably ranged wastewater point. An aeration basin can require a different concentration range from an outlet. If the normal or upset solids concentration exceeds 2000 mg/L, obtain a suitable alternative rather than assuming every sludge application is covered by this model.

Operating Specification and Ordered Options

A pressure limit below 0.2 MPa must not be treated as permission to install at every nominal 20 m depth. Allow for the actual liquid head and process pressure, including transients, and keep the installation within the stated limit. IP68 also does not establish resistance to every chemical in an industrial stream.

Using optical suspended-solids data in a real process

An optical TSS sensor is strongest as a continuous trend instrument. It shows changes that a periodic laboratory sample may miss, but the optical response depends on particle size, colour, shape and concentration. Two streams with the same gravimetric suspended-solids result can produce different optical readings. For a wastewater plant or sludge process, build a site relationship from paired sensor readings and representative laboratory samples across normal and upset conditions.

Do not calibrate from one grab sample and assume the relationship will remain valid after the process changes. Keep records of product grade, coagulant dose, biological condition and cleaning events. If particle characteristics change, review the correlation before using the signal for dosing or discharge decisions.

Choose a Representative Point With Cleaning Access

Keep the optical region more than 5 cm from the side wall and at least 10 cm from the bottom. These clearances reduce boundary effects; they do not make a stagnant corner representative. Avoid settled deposits and persistent bubbles, and check that the window stays immersed at the lowest operating level.

In an aerated tank, compare a bubble-rich position with a calmer representative location before fixing the bracket. In an effluent channel, consider flow distribution, low-level exposure and debris. In process water, check whether a sidestream changes the particle population through settling, pumping or filtration.

Provide a mount that permits safe retrieval without pulling on the cable. Inspect the optical window and cable restraint. Clean with an appropriate soft, damp material and rinse away loosened deposits; do not scrape the optics or open the sealed probe for routine maintenance. Choose the inspection interval from actual fouling and reference-check history, not a universal weekly promise.

Connect RS485 or the Ordered Current Output

The identified digital cable uses red for supply positive, black for GND, blue for RS485 A and white for RS485 B. Confirm the delivered lead identification before energizing. Do not assign an extra conductor from another sensor's colour scheme; obtain the selected 4-20 mA connection definition when that option is ordered.

Set the actual address, baud rate, register interpretation and concentration unit in the PLC, RTU or data logger. If an analog channel is included, agree its full scale and verify the controller conversion against the digital value under a stable condition. A gateway provides onward network communication; it does not change how particles produce the optical result.

During commissioning, compare an installed reading with a representative sample taken at the same place and time. Record cleaning and calibration status. Also test an unavailable input so a disconnected instrument does not appear as a valid zero-solids result. Instrument calibration, the receiving signal path and the process relationship are three different checks.

Request a Configuration Matched to the Stream

Send NiuBoL the water or sludge type, expected concentration band and peak, temperature, pressure, installation arrangement and cable route. Identify the receiving input and whether the quote needs only the probe or also mounting, acquisition and communications. State the reference method used for acceptance. No single correlation, cleaning interval or selling price applies to every stream.

The illustration below shows a general environmental monitoring architecture. It is not a wiring diagram or a list of equipment automatically included with the TSS probe. Specify the actual receiving hardware and accessories in the quotation.

Project Decision FAQ

Q1. Can it replace the laboratory suspended-solids method?

No. The optical channel provides a continuous indication. A project using a laboratory reference must establish and maintain the relationship for its actual sample matrix.

Q2. Is this range suitable for every activated-sludge basin?

No. Check the actual concentration and credible peak against 0-2000 mg/L. Obtain another range or model when the stream exceeds that band.

Q3. Does 0.1 mg/L resolution mean a 0.1 mg/L detection limit?

No. Resolution is the output increment. Do not infer a detection limit from that number; define the required low-end performance separately.

Q4. Are digital and current outputs always included?

RS485 Modbus RTU is specified; 4-20 mA is optional. Confirm the ordered outputs, lead assignment and analog scale before connecting either system.

Q5. Why might the reading change after a process adjustment?

Particle properties may have changed as well as concentration. Compare representative samples and check window condition before changing calibration to force agreement with one observation.

Q6. What documents make an inquiry useful?

Provide the process band, mounting and pressure conditions, required output, cable length and reference method. Request the exact connection and register information for the supplied version.

Summary

The NBL-WQ-TSS-4S is an online suspended solids sensor for a defined concentration range and sample matrix. Match its optical response to the process, respect operating limits, and keep the point accessible for cleaning and comparison. Select the interface and supporting equipment as an explicit configuration.

NBL-WQ-TSS-4S Online Total Suspended Solids Sensor.pdf