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WQA-140

Turbidity and Suspended Solids Analyzer

Immersion sensor measuring turbidity up to 4000 NTU and suspended solids up to 1000 mg/L using dual-angle infrared scattering.

TurbidityTSSInfrared scatteringSapphire windowRS485Modbus RTUIP68316L
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WQA-140 Turbidity and Suspended Solids Analyzer
Water Quality Monitoring
Family
WQA Series
Category
Water Quality Monitoring
Measuring range
0 to 4000 NTU; 0 to 1000 mg/L
Principle
Dual-angle (90° and 135°) infrared scattering

01Overview

Engineered for the field

An immersion sensor that continuously measures turbidity and suspended solids, giving operators the data they need to control sludge handling, track effluent quality and fine-tune treatment. Infrared light passing through the water is scattered by particles, and two detector sets at 90° and 135° capture that scattered light to calculate concentration across 0 to 4000 NTU or 0 to 1000 mg/L. A sapphire optical window resists wear and stays optically stable, multi-point factory calibration means it is ready to use out of the box, and digital RS485 Modbus communication keeps the signal clean over long cable runs. The 316L stainless steel body is rated IP68, and an optional brush wiper keeps the window clean.

02Key Features

What makes the WQA-140 different

01

Two measurements in one

Reports both turbidity and suspended solids (sludge) concentration from one sensor.

02

Dual-angle scattering

Detectors at 90° and 135° capture scattered infrared light for reliable concentration readings.

03

Sapphire optical window

Hard, wear-resistant window that stays optically stable in abrasive water.

04

Ready to use

Built-in multi-point calibration means no secondary calibration on site.

05

Optional self-cleaning brush

A brush wiper keeps the optics clear and cuts maintenance visits.

03Technical Specifications

Detailed specifications

Overview

Measuring range
0 to 4000 NTU; 0 to 1000 mg/L
Principle
Dual-angle (90° and 135°) infrared scattering
Output
RS485, Modbus RTU
Protection
IP68

Performance

Resolution
≤0.01 NTU
Accuracy
±3% or ±0.1 NTU, whichever is greater
Repeatability
0.1 NTU or ≤1%, whichever is greater

Mechanical

Dimensions
Ø40.5 × 240 mm
Material
316L stainless steel
Connection
1 inch conical external thread
Cable
10 m shielded as standard, custom lengths available

Environment

Operating temperature
0 to 60 °C
Relative humidity
0 to 95 %RH, non-condensing
Operating pressure
Max. 4 bar

04Applications

Built for these use cases

  • Use case 01

    Surface water turbidity monitoring

  • Use case 02

    Raw water and filter backwash in drinking water plants

  • Use case 03

    Wastewater inlet and outlet solids

  • Use case 04

    Industrial process and cooling water

Industries

Deployed across these sectors

ManufacturingUtilitiesEnergyEnvironmental Monitoring

05Resources

Datasheets, manuals and technical documents

Documents are shared on request. Tell us which file you need and our team will send it to you.

  • WQA-140 Datasheet

    Datasheet

    Request

  • WQA-140 User Manual

    User Manual

    Request

06Related products

Complementary engineering