Endress+Hauser CYA251 User manual

BA00495C/07/EN/02.12
71189534
Operating Instructions
Flowfit CYA251
Flow assembly for nitrate/SAC, turbidity and oxygen sensors

Flowfit CYA251
Endress+Hauser 3
Table of contents
1 Safety instructions . . . . . . . . . . . . . . . . 4
1.1 Designated use . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Installation, commissioning and operation . . . . . . . . 4
1.3 Operational safety . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4 Notes on safety icons and symbols . . . . . . . . . . . . . . 5
2 Identification . . . . . . . . . . . . . . . . . . . . 6
2.1 Nameplate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Order code and device version . . . . . . . . . . . . . . . . . 6
2.3 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Installation . . . . . . . . . . . . . . . . . . . . . . 7
3.1 Incoming acceptance, transport, storage . . . . . . . . . . 7
3.2 Installation conditions . . . . . . . . . . . . . . . . . . . . . . . 7
3.3 Installation instructions . . . . . . . . . . . . . . . . . . . . . 10
3.4 Installation with wall holder unit . . . . . . . . . . . . . . 11
3.5 Sensor installation . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.6 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.7 Post-installation check . . . . . . . . . . . . . . . . . . . . . . 14
4 Commissioning. . . . . . . . . . . . . . . . . . 15
5 Maintenance. . . . . . . . . . . . . . . . . . . . 16
5.1 Cleaning the assembly . . . . . . . . . . . . . . . . . . . . . . 16
5.2 Cleaning the sensor . . . . . . . . . . . . . . . . . . . . . . . . 16
5.3 Cleaning agents . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.4 Replacing the seals . . . . . . . . . . . . . . . . . . . . . . . . 17
6 Accessories. . . . . . . . . . . . . . . . . . . . . 18
6.1 Cleaning nozzle . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.2 Sensor adapter . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.3 Wall holder unit . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7 Troubleshooting . . . . . . . . . . . . . . . . . 20
7.1 Replacing damaged parts . . . . . . . . . . . . . . . . . . . . 20
7.2 Spare parts kits . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.3 Return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7.4 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
8 Technical Data . . . . . . . . . . . . . . . . . . 21
8.1 Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
8.2 Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
8.3 Mechanical construction . . . . . . . . . . . . . . . . . . . . 21
Index . . . . . . . . . . . . . . . . . . . . . . . . . 23

Safety instructions Flowfit CYA251
4Endress+Hauser
1 Safety instructions
1.1 Designated use
The CYA251 flow assembly is designed for the installation of nitrate/SAC, turbidity and oxygen
sensors, each with a diameter of 40 mm. The assembly is used in pipes and hoses.
Thanks to its special design, it is possible to operate the flow assembly in pressurized systems (see
"Technical data").
Any other use than the one described here compromises the safety of persons and the entire
measuring system and is not permitted.
The manufacturer is not liable for damage caused by improper or non-designated use.
1.2 Installation, commissioning and operation
Please note the following items:
• Switch off the cleaning unit before removing the sensor from the medium.
• Installation, commissioning, operation and maintenance of the measuring system must only be
carried out by trained technical personnel.
Trained personnel must be authorized for the specified activities by the system operator.
• Electrical connection must only be carried out by a certified electrician.
• Technical personnel must have read and understood these Operating Instructions and must
adhere to them.
• Before commissioning the entire measuring point, check all the connections. Ensure that
electrical cables and hose connections are not damaged.
• Do not operate damaged products and secure them against unintentional commissioning.
Mark the damaged product as being defective.
• Measuring point faults may only be rectified by authorized and specially trained personnel.
• If faults can not be rectified, the products must be taken out of service and secured against
unintentional commissioning.
• Repairs not described in these Operating Instructions may only be carried out at the
manufacturer’s or by the service organization.
1.3 Operational safety
The sensor has been designed and tested according to the state of the art and left the factory in
perfect functioning order.
Relevant regulations and European standards have been met.
As the user, you are responsible for complying with the following safety conditions:
• Installation instructions
• Local prevailing standards and regulations.

Flowfit CYA251 Safety instructions
Endress+Hauser 5
1.4 Notes on safety icons and symbols
The structure, signal words and safety colors of the signs comply with the specifications of
ANSI Z535.6 ("Product safety information in product manuals, instructions and other collateral
materials").
Safety message structure Meaning
DANGER
!
Cause (/consequences)
Consequences if safety message
is not heeded
• Corrective action
This symbol alerts you to a dangerous situation.
Failure to avoid the situation will result in a fatal or serious
injury.
WARNING
!
Cause (/consequences)
Consequences if safety message
is not heeded
• Corrective action
This symbol alerts you to a dangerous situation.
Failure to avoid the situation can result in a fatal or serious
injury.
CAUTION
!
Cause (/consequences)
Consequences if safety message
is not heeded
• Corrective action
This symbol alerts you to a dangerous situation.
Failure to avoid this situation can result in minor or medium
injury.
NOTICE
Cause/situation
Consequences if safety message
is not heeded
• Action/note
This symbol alerts you to situations that can result in damage to
property and equipment.
È ä 1 This symbol indicates a cross reference to a defined page (e.g. p. 1).
È å 2 This symbol indicates a cross reference to a defined figure (e.g. fig. 2).

Identification Flowfit CYA251
6Endress+Hauser
2 Identification
2.1 Nameplate
The nameplate contains the following information:
• Manufacturer data
•Ordercode
• Extended order code
• Serial number
• Operating conditions
• Safety icons
Compare the order code on the nameplate with your order.
2.2 Order code and device version
Enter the following address in your browser to access the product page:
www.products.endress.com/cya251
1. You can choose from the following options on the product page located on the right:
2. Click "Configure this product".
3. The configurator opens in a separate window. You can now configure your device and receive
the complete order code that applies for the device.
4. Afterwards, export the order code as a PDF or Excel file. To do so, click the appropriate button
at the top of the page.
2.3 Scope of delivery
The scope of delivery comprises:
• Flow assembly in the version ordered (contains the sensor adapter and process connection)
• Accessories ordered
• Adapter with check valve (for optional cleaning only, 6 mm connection for compressed air)
• 1 tube of lubricant (for O-rings)
• Operating Instructions, English
When the flow assembly is delivered, the cleaning port and cleaning connection are fitted with
dummy plugs.
If you have any questions, please contact your supplier or your local sales center.

Flowfit CYA251 Installation
Endress+Hauser 7
3 Installation
3.1 Incoming acceptance, transport, storage
• Make sure the packaging is undamaged!
• Inform the supplier about any damage to the packaging.
Keep the damaged packaging until the matter has been settled.
• Make sure the contents are undamaged!
• Inform the supplier about damage to the contents. Keep the damaged products until the matter
has been settled.
• Check that the order is complete and agrees with your shipping documents.
• The packaging material used to store or to transport the product must provide shock protection
and humidity protection. The original packaging offers the best protection. Also, keep to the
approved ambient conditions (see "Technical data").
• If you have any questions, please contact your supplier or your local sales center.
3.2 Installation conditions
3.2.1 Dimensions
a0016082
Fig. 1: Dimensions
Sensor CAS51D
2 mm
CAS51D
8 mm
CAS51D
40 mm
COS51D
COS41
COS61D
COS61
COS31
CUS31
CUS41
CUS51D
Zmm(inch) 468 (18.43) 471 (18.54) 477 (18.78) 284 (11.18) 326 (12.83) 325 (12.80) 332 (13.07)
Connections NPT ¾" Rp ¾ DN 25 ANSI 1" Hose D20 G1¼
Xmm(inch) 83 (3.27) 83 (3.27) 83 (3.27) 50 (1.97) 137 (5.39) 61 (2.40)
Ymm(inch) 50.5 (1.99) 50.5 (1.99) 50.5 (1.99) 115 (4.53) 50.5 (1.99) 44.5 (1.75)

Installation Flowfit CYA251
8Endress+Hauser
3.2.2 Notes on installation
To ensure that medium flows through the assembly in a bypass configuration, the pressure p1 must
be greater than the pressure p2. This is achieved by installing an orifice plate in the main pipe.
a0016023
Fig. 2: Connection example involving a bypass and an orifice plate in the main pipe
a0017221
Abb. 3: Connection example involving a bypass and an orifice plate in the main pipe (assembly rotated by 90 °, inlet
at bottom)
p1 p2 p1 > p2

Flowfit CYA251 Installation
Endress+Hauser 9
No measures to increase pressure are required for branch pipes that branch off from the main pipe.
a0016024
Fig. 4: Connection example involving an open outlet
The inlet and outlet connection of the flow assembly are always identical.
The inlet and outlet side are not specified by the flow assembly and can therefore be selected to suit
the particular application.
The flow assembly is designed to be connected to pipes and hoses. You require the following at the
mounting location to install the assembly:
Part name Where required ...
Two shutoff valves For the bypass solution
One shutoff valve For the solution with an open outlet
Orifice plate in the main pipe For the bypass solution
Dirt filter (500 μm or finer) If the medium contains coarse dirt particles
Pressure-reducing valve If the pressure of the medium is higher than the
permitted value (see "Technical data" section)
Wall holder unit (see "Accessories" section) to secure the
assembly
For hose connections
Pipe or hose connections to the assembly For all versions

Installation Flowfit CYA251
10 Endress+Hauser
3.3 Installation instructions
3.3.1 Measuring system
A complete measuring system comprises:
• Flowfit CYA251 flow assembly
• A 40 mm sensor, e.g. CAS51D
• Transmitter, e.g. Liquiline CM442
• Measuring cable
a0016022
Fig. 5: Measuring system (example)
1 Process pipe
2 Liquiline CM442 transmitter
3 Measuring cable
4 Return line with shutoff valve
5 CYA251 flow assembly with 40 mm sensor
6 Inlet with shutoff valve