Endress+Hauser Turbimax CUS51D-AAC1A2 Inline Turbidity & Suspended Solids Sensor

The Endress+Hauser CUS51D-AAC1A2 is a highly advanced, dual-channel turbidity and suspended solids sensor from the trusted Turbimax CUS50D series. Designed for the most demanding industrial water and process applications, this sensor provides simultaneous, independent measurements of turbidity and suspended solids concentration. It is the ideal solution for monitoring water quality, optimizing process control, and ensuring compliance in treatment plants, chemical production, food and beverage, and wastewater management.

Technical Specifications

Model: CUS51D-AAC1A2 (2-wire, 4…20 mA with HART®)

Series: Turbimax CUS50D

Measurement Principle: Combined 90° scattered light (turbidity) and transmitted light (suspended solids)

Measurement Ranges:

Turbidity: 0.001 to 1000 FNU / 0.01 to 4000 NTU

Suspended Solids: 0.001 to 4000 mg/L (or g/L, depending on calibration)

Accuracy: Typically ±2% of reading or ±0.001 FNU (whichever is greater)

Process Connection: DIN 80/100 flange, ANSI, or Tri-Clamp options (specific to order)

Sensor Body: Stainless steel (AISI 316L) or titanium

Measuring Window: Sapphire glass for extreme abrasion resistance

Pressure Rating: Up to 16 bar (232 psi)

Temperature Range: -10 to +60°C (14 to 140°F)

Output: Dual, simultaneous 4…20 mA HART signals (one for each parameter)

Certifications: IP68/NEMA 6P, EHEDG, 3-A, suitable for potable water

Key Features & Competitive Advantages

1. Unmatched Dual-Channel Technology

The CUS51D’s core advantage is its ability to measure turbidity (clarity) and suspended solids (concentration) independently and simultaneously with a single sensor. This eliminates the need for two separate instruments, saving cost, space, and maintenance complexity.

2. Exceptional Reliability in Harsh Conditions

Featuring a self-cleaning, maintenance-free design with a abrasion-resistant sapphire window, the sensor delivers stable readings even in fouling or coating applications. Its robust construction ensures long-term operation in aggressive media.

3. High Precision Across Full Range

Utilizing advanced nephelometric and transmission light technologies, the sensor offers high sensitivity at very low levels (critical for filtrate or drinking water) and reliable measurement at high concentrations (for sludge or effluent).

4. Smart Diagnostics & Easy Integration

With integrated HART communication, the sensor enables remote configuration, calibration, and diagnostic monitoring. Its plug-and-play design with the Liquiline CM44x transmitter allows for quick setup and seamless integration into existing control systems.

5. Low Operational Cost & Compliance Ready

The sensor reduces chemical usage, optimizes filter and flocculant dosing, and ensures effluent compliance. Its approvals (like 3-A and EHEDG) make it suitable for hygienic and potable water applications worldwide.

Ideal Applications

Drinking water treatment (filter monitoring, final turbidity control)

Wastewater treatment (influent, effluent, RAS, and sludge blanket control)

Chemical and pharmaceutical processes

Food & beverage production (product clarity, CIP monitoring)

Industrial water circuits and cooling towers

Why Choose the Turbimax CUS51D-AAC1A2?

This sensor is not just a measurement device; it’s a critical component for process optimization and quality assurance. By providing two key parameters from one robust point of installation, it enhances data integrity, reduces installation costs, and minimizes maintenance downtime. Endress+Hauser’s global support and sensor expertise ensure you have a reliable partner for your most critical measurement tasks.

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