E+H Turbimax CUS51D Turbidity Sensor

Fits wastewater and process turbidity/solids loops that need a Memosens digital sensor with formazin turbidity 0–4000 FNU (display to 9999 FNU), sludge solids to ~300 g/L application-dependent, IP68 immersion rating, and Liquiline transmitter pairing.

Key advantages

0–4000 FNU formazin — Display to 9999 FNU; sludge solids to ~300 g/L application-dependent.
Memosens digital — Sensor to Liquiline transmitters; factory formazin calibration path.
IP68 immersion class — 316L 40 mm sensor body; G1 / NPT ¾ and Flexdip assemblies.
Process −5…+50 °C — Ambient −20…+60 °C per TI00461C.

Typical applications

Wastewater turbidity and suspended-solids monitoring.
Process water loops standardized on Liquiline + Memosens sensors.
Immersion assemblies (Flexdip CYA112/CYH112) needing digital turbidity.

Selection guide

Measuring range — Formazin turbidity 0–4000 FNU (display to 9999 FNU); sludge solids to ~300 g/L (application-dependent).
Accuracy — Factory formazin calibration; application models pre-calibrated; 1–5 point customer calibration.
Output — Memosens digital to Liquiline transmitters (CUS51D digital sensor).
Supply — Via Memosens/Liquiline measuring system.
Process connection — G1 / NPT ¾; Flexdip CYA112/CYH112 immersion assemblies.
Wetted materials — Stainless steel 316L sensor body.
Housing — 316L, 40 mm sensor design (~194 mm length).
IP — IP68 (1 m / 3.3 ft water column with 1N KCl / 60 days per TI).
Media temperature — Process −5 to +50 °C (23 to 122 °F).
Ambient — −20 to +60 °C (−4 to +140 °F).
Communication — Memosens digital protocol.
Display — Via connected Liquiline transmitter.
Approvals — CE and regional approvals per TI00461C.
Notes — Specs from Endress+Hauser TI00461C/07/EN/20.25-00 (2025-10-20) + product page..

Common mistakes

Ordering without a Liquiline/Memosens transmitter — CUS51D is a digital sensor powered via the measuring system.
Treating ~300 g/L solids as universal — application-dependent; lock sludge model/calibration on the RFQ.
Ignoring immersion assembly needs — Flexdip CYA112/CYH112 listed for immersion.
Exceeding process −5…+50 °C media window.

When to RFQ / what to tell us

Turbidity vs solids duty, expected FNU/g/L span, and Liquiline transmitter model.
Process connection (G1 / NPT ¾) vs Flexdip immersion assembly; calibration (factory formazin / 1–5 point).
Quantity, ship-to, ambient (−20…+60 °C).

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Specs

Spec	Value
SKU	47605
Brand	Endress+Hauser
Model	Turbimax CUS51D
Product type	sensor
Measuring range	Formazin turbidity 0–4000 FNU (display to 9999 FNU); sludge solids to ~300 g/L (application-dependent)
Accuracy	Factory formazin calibration; application models pre-calibrated; 1–5 point customer calibration
Output signal	Memosens digital to Liquiline transmitters (CUS51D digital sensor)
Supply voltage	Via Memosens/Liquiline measuring system
Process connection	G1 / NPT ¾; Flexdip CYA112/CYH112 immersion assemblies
Wetted materials	Stainless steel 316L sensor body
Housing material	316L, 40 mm sensor design (~194 mm length)
IP rating	IP68 (1 m / 3.3 ft water column with 1N KCl / 60 days per TI)
Media temperature	Process −5 to +50 °C (23 to 122 °F)
Ambient temperature	−20 to +60 °C (−4 to +140 °F)
Communication	Memosens digital protocol
Display	Via connected Liquiline transmitter
Approvals	CE and regional approvals per TI00461C
Notes	Specs from Endress+Hauser TI00461C/07/EN/20.25-00 (2025-10-20) + product page.

Documents

FAQ

Q: What ranges? A: Formazin turbidity 0–4000 FNU (display to 9999 FNU); sludge solids to ~300 g/L application-dependent.

Q: Which transmitter? A: Memosens digital to Liquiline transmitters — state CM/transmitter family on the RFQ.

Q: What should I send for a quote? A: Duty span, connection/assembly, Liquiline model, quantity. Compatible with systems using E+H Turbimax CUS51D — we do not claim authorized-dealer status.