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Universal flow assembly Flowfit CYA251

Flow assembly for water, wastewater and utilities

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Universal flow assembly Flowfit CYA251

Flow assembly for water, wastewater and utilities

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Benefits

  • Easy adaptation to your system: Process connections for almost all pipe diameters available.
  • Variable mounting options: Suitable for pipe or wall installation.
  • Fast measuring values: Low assembly volume shortens sensor response times.
  • Easy and safe maintenance: Automatic sensor cleaning without process interrupt.
  • Robust design: Suitable for process pressures up to 6 bar (87 psi).
Manufacturer's warranty

Engineered for confidence

Our instruments are designed for long‑lasting performance, precise measurement, and dependable operation in demanding industrial environments. Each product includes a standard manufacturer’s warranty that reflects our commitment to quality and to the trust you place in our solutions.

Should a warranty case occur, the device will be assessed and the applicable remedy will be provided in line with the warranty terms – helping ensure a reliable and efficient resolution and supporting continued operation of your measurement point.

Request for extended warranty

If you require extended warranty coverage, simply contact your local Endress+Hauser representative. Our experts will advise you on the available options to match your application and risk profile, helping you protect your investment, reduce unexpected repair costs, and ensure reliable long‑term operation beyond the manufacturer's warranty period.

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Warranty terms apply

The manufacturer's warranty and extended warranty are subject to specific conditions. For full details, please refer to the locally applicable General Terms and Conditions (GTC), which can be found on the respective country page of our website.

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Endress+Hauser’s qualified service engineers ensure your measurement devices are commissioned right the first time, delivering application‑aligned accuracy, regulatory compliance, and operational confidence from startup onwards, anywhere in the world.

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With Endress+Hauser Smart Support, you benefit from faster issue resolution, higher uptime, reliable global expertise across the entire product lifecycle – and lasting peace of mind.

Committed to long‑term, sustainable performance

With deep field expertise, harmonized processes, and continuous monitoring, we accompany you with comprehensive service offerings – from initial start‑up through instrumentation maintenance to process optimization – as a true lifetime partner delivering improved outcomes.

For additional information, please contact your local Endress+Hauser representative.

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Product information

Flowfit CYA251 is a ruggedized flow assembly for nitrate/SAC, turbidity and oxygen sensors
Universal flow assembly
Specifications
Oxygen
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Description

Flowfit CYA251 is a flow assembly for nitrate/SAC, turbidity and oxygen sensors with a diameter of 40mm. It allows optimum adaption to your piping system thanks to numerous available process connections. The ruggedized material withstands even aggressive media and harsh environmental conditions and a back-pressure valve protects your process from blowing out and increases operational safety. Better still, with the automatic cleaning nozzle, you'll benefit from extended maintenance intervals.

Field of application

Flowfit CYA251 is a universal flow assembly for:

  • Wastewater treatment plants: - Process water treatment and monitoring - Effluent water monitoring
  • Drinking and process water: - Process water treatment and monitoring - Filter monitoring and filter backwash
  • Utilities of all industries: - Process water treatment and monitoring - Cooling water monitoring

It is suitable for:

  • Nitrate/SAC: All measuring ranges
  • Oxygen: All measuring ranges
  • Turbidity: Mid and high measuring ranges
Benefits
  • Easy adaptation to your system: Process connections for almost all pipe diameters available.
  • Variable mounting options: Suitable for pipe or wall installation.
  • Fast measuring values: Low assembly volume shortens sensor response times.
  • Easy and safe maintenance: Automatic sensor cleaning without process interrupt.
  • Robust design: Suitable for process pressures up to 6 bar (87 psi).
Predecessors
Downloads
Most downloaded
Technical Information (TI)
CYA251 Flow assembly for nitrate/SAC, turbidity and oxygen sensors
English version - 10/2020
Download
Operating Instruction (BA)
Flowfit CYA251 Flow assembly for nitrate/SAC, turbidity and oxygen sensors
English version - 10/2020
Download
Manufacturer Declaration
Product family: Armaturen Product root: CYA251-
Declaration number: HE_01082_01.18
Manufacturer specification: PED
English version - 01/2019
Download
The CAD Drawings will be available after the configuration.
All downloads
5 Downloads
Technical Information (TI)
Most downloaded
CYA251 Flow assembly for nitrate/SAC, turbidity and oxygen sensors
English version - 10/2020
Download
Operating Instruction (BA)
Most downloaded
Flowfit CYA251 Flow assembly for nitrate/SAC, turbidity and oxygen sensors
English version - 10/2020
Download
Manufacturer Declaration
Product family: Armaturen Product root: CYA251-
Declaration number: HE_01082_01.18
Manufacturer specification: PED
English version - 01/2019
Download
Manufacturer Declaration
Product family: Armaturen Product root: CYA251-
Declaration number: HE_01031_01.18
Manufacturer specification: RoHS
English version - 09/2018
Download
Components sheet
Sensoradapter: CUS52D for CYA251/CUA250 SF Sensoradapter: CUS52D for CYA251/CUA250
English version - 08/2026
Download

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Spare parts and accessories

further parts
further parts

Kit CYA251: Set of gaskets

further parts
further parts
Order code 71162868
further parts
further parts

Kit CYA251: Blind plug for cleaning

further parts
further parts
Order code 71162872
further parts
further parts

Kit spray nozzle CUS50D

further parts
further parts
Order code 71424819
further parts
further parts

Kit CYA251 sensor adapter CUS50D

further parts
further parts
Order code 71420151
Spare parts & accessories
Flowfit CYA251 is a ruggedized flow assembly for nitrate/SAC, turbidity and oxygen sensors
Universal flow assembly

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Flowfit CYA251 is a ruggedized flow assembly for nitrate/SAC, turbidity and oxygen sensors
Universal flow assembly
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CAD Drawings
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Spare parts and accessories

further parts
further parts

Kit CYA251: Set of gaskets

further parts
further parts
Order code 71162868
further parts
further parts

Kit CYA251: Blind plug for cleaning

further parts
further parts
Order code 71162872
further parts
further parts

Kit spray nozzle CUS50D

further parts
further parts
Order code 71424819
further parts
further parts

Kit CYA251 sensor adapter CUS50D

further parts
further parts
Order code 71420151
Spare parts & accessories