Endress+Hauser Flowfit CUA252 User manual

Products Solutions Services
BA01281C/07/EN/01.13
71238090
Operating Instructions
Flowfit CUA252
Flow assembly for CUS52D turbidity sensor

Endress+Hauser
Document information
Warnings
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").
Symbols
Safety message structure Meaning
DANGER
!
Causes (/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
!
Causes (/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
!
Causes (/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 more
serious injuries.
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.
Additional information, tips
Permitted or recommended
Forbidden or not recommended

Flowfit CUA252
Endress+Hauser 3
Table of contents
1 Basic safety instructions . . . . . . . . . . . . . 4
1.1 Requirements for personnel . . . . . . . . . . . . . . . . . . 4
1.2 Designated use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.3 Occupational safety . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4 Operational safety . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.5 Product safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Incoming acceptance and product
identification . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Incoming acceptance . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Product identification . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.4 Certificates and approvals . . . . . . . . . . . . . . . . . . . . 6
3 Installation . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2 Installation conditions . . . . . . . . . . . . . . . . . . . . . . . 8
3.3 Installation instructions . . . . . . . . . . . . . . . . . . . . 10
3.4 Sensor installation . . . . . . . . . . . . . . . . . . . . . . . . 13
3.5 Post-installation check . . . . . . . . . . . . . . . . . . . . . 13
4 Commissioning. . . . . . . . . . . . . . . . . . . . 14
5 Maintenance. . . . . . . . . . . . . . . . . . . . . .15
5.1 Cleaning the assembly . . . . . . . . . . . . . . . . . . . . . 15
5.2 Cleaning the sensor . . . . . . . . . . . . . . . . . . . . . . . 15
5.3 Cleaning agent . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.4 Checking and replacing the seals . . . . . . . . . . . . 16
6 Repair. . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.1 Spare parts kits . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.2 Return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
7 Accessories . . . . . . . . . . . . . . . . . . . . . . . 18
7.1 Connection accessories . . . . . . . . . . . . . . . . . . . . . 18
7.2 Bubble trap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7.3 Wall mounting kit . . . . . . . . . . . . . . . . . . . . . . . . . 19
8 Technical data . . . . . . . . . . . . . . . . . . . . 20
8.1 Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
8.2 Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
8.3 Mechanical construction . . . . . . . . . . . . . . . . . . . 21
Index. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Basic safety instructions Flowfit CUA252
4Endress+Hauser
1 Basic safety instructions
1.1 Requirements for personnel
‣Installation, commissioning, operation and maintenance of the measuring system must
only be carried out by specially trained technical personnel.
‣The technical 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.
‣Faults at the measuring point may only be rectified by authorized and specially trained
personnel.
Repairs not described in the enclosed Operating Instructions may only be carried out
directly at the manufacturer’s or by the service organization.
1.2 Designated use
The CUA252 flow assembly is designed for the installation of the CUS52D turbidity sensor.
Its main areas of application are:
• Final turbidity measurement in the outlet of waterworks
• Turbidity measurement in the inlet of waterworks
• Turbidity measurement at all stages of the process
• Turbidity measurement for filter monitoring and filter backwashing
• Turbidity measurement in drinking water networks
Any other use than the one described here compromises the safety of persons and the entire
measuring system and is therefore not permitted.
The manufacturer is not liable for damage resulting from improper or non-designated use.
1.3 Occupational safety
As the user, you are responsible for complying with the following safety conditions:
• Explosion protection guidelines (only devices approved for use in explosion hazardous
areas)
• Installation instructions
• Local prevailing standards and regulations
Electromagnetic compatibility
This device has been tested for electromagnetic compatibility in accordance with the
applicable European standards for industrial applications.
The electromagnetic compatibility indicated only applies to a device that has been connected
in accordance with the instructions in these Operating Instructions.
1.4 Operational safety
‣Before commissioning the entire measuring point, make sure all the connections are
correct. Ensure that electrical cables and hose connections are not damaged.
‣Do not operate damaged products, and secure them against unintentional
commissioning. Label and identify the damaged product as defective.
‣If faults cannot be rectified, you must take the products out of service and secure them
against unintentional commissioning.

Flowfit CUA252 Basic safety instructions
Endress+Hauser 5
1.5 Product safety
The product is designed to meet state-of-the-art safety requirements, has been tested and
left the factory in a condition in which it is safe to operate.
Relevant regulations and European standards have been observed.

Incoming acceptance and product identification Flowfit CUA252
6Endress+Hauser
2 Incoming acceptance and product
identification
2.1 Incoming acceptance
• Make sure the packaging is undamaged!
• Notify the supplier of any damage to the packaging. Keep the damaged packaging until the
matter has been settled.
• Make sure the contents are not damaged!
• Notify the supplier of any damage to the delivery contents. Keep the damaged products
until the matter has been settled.
• Check the delivery to make sure nothing is missing. Compare it against the shipping
documents and your order.
• Pack the product for storage and transportation in such a way that it is reliably protected
against impact and moisture. The original packaging offers the best protection.
Furthermore, the permitted ambient conditions must also be observed (see "Technical
data").
• If you have any questions, contact your supplier or your local sales center.
2.2 Product identification
2.2.1 Nameplate
You can find the following information on the nameplate:
• Manufacturer details
•Ordercode
• Extended order code
• Serial number
• Operating conditions
• Safety information symbols
Compare the order code on the nameplate with your order.
2.2.2 Identifying the product
The order code and serial number of your device can be found in the following locations:
• On the nameplate
• In the shipping documents
To discover what product version you have, enter the order code on the nameplate into
the search screen at the following address:
www.products.endress.com/order-ident
2.3 Scope of delivery
The scope of delivery comprises:
• 1 Flowfit CUA252 flow assembly in the version ordered
• 1 Set of Operating Instructions BA01281C/07/EN
If you have any questions, contact your supplier or your local sales center.
2.4 Certificates and approvals
Declaration of Conformity
The product meets the requirements of the harmonized European standards.
As such, it complies with the legal specifications of the EC directives.
The manufacturer confirms successful testing of the product by affixing to it the 4mark.

Flowfit CUA252 Installation
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3Installation
3.1 Dimensions
a0022255
Fig. 1: Dimensions in mm (inch)
Connections NPT ¾" Rp ¾ Glue-in port
D25
ANSI 2" Hose
D25
Hose
D12
G1¼
Xmm(inch) 70 (2.76) 64 (2.52) 22 (0.87) 71 (2.80) 74 (2.91) 74 (2.91) 0
Ymm(inch) Ø 58(2.28) Ø 58(2.28) Ø 58(2.28) Ø 152 (5.98) Ø 58(2.28) Ø 58(2.28) Ø 58(2.28)

Installation Flowfit CUA252
8Endress+Hauser
3.2 Installation conditions
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.
a0022258
Fig. 2: Connection example involving a bypass and an orifice plate in the main pipe (supply from below)
p1 p2 p1 > p2

Flowfit CUA252 Installation
Endress+Hauser 9
No measures to increase pressure are required for branch pipes that branch off from the
main pipe.
a0022259
Fig. 3: Connection example involving an open outlet
The inlet and outlet connection of the flow assembly are always identical, the system is
symmetrical.
Install the flow assembly vertically.
The supply must be connected at the bottom (upward flow in the pipe).
Avoid buckles and loops in the hose system.
Pay attention to the installation instructions (flow direction) for the sensor.
Many fluids tend to develop gas bubbles in a depressurized state.
Operating the flow assembly under pressure (adjustable valve after the flow assembly)
prevents this behavior in many cases.

Installation Flowfit CUA252
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3.3 Installation instructions
3.3.1 Measuring system
A complete measuring system consists of:
• Flowfit CUA252 flow assembly
• Turbimax CUS52D sensor
• Transmitter, e.g. Liquiline CM442
•Measuringcable
a0022262
Fig. 4: Measuring system (example)
1 Process pipe
2 Liquiline CM442 transmitter
3Measuringcable
4 Return line with shutoff valve
5 CUA252 flow assembly with CUS52D sensor
6 Supply line with shutoff valve

Flowfit CUA252 Installation
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3.3.2 Installation with wall holder unit
a0022264
Fig. 5: Wall holder unit
1 Hanger bolt STST 10x60 (included in the delivery for the wall mounting kit)
Please comply with the following instructions when installing the flow assembly:
• Mount the flow assembly either
–inabypass
In the bypass pipe, install a shutoff valve upstream and downstream of the flow
assembly. This makes it possible to clean the sensor or perform other maintenance tasks
without affecting the process.
– or in a branch pipe with an open outlet.
Install a shutoff valve upstream of the flow assembly.
• Mount the assembly in a vertical, upright position.
• Establish the medium connection using commercially available connection fittings.

Installation Flowfit CUA252
12 Endress+Hauser
3.3.3 Installation with bubble trap
a0022693
Fig. 6: Connection example with bubble trap
1 Supply from below
2 Shutoff valve
3Bubbletrap
4 Bubble trap venting (included in the delivery)
5 Shutoff valve (throttle to increase pressure)
6Outlet
7 Transition to D 12 with connection for vent line (included in the delivery)
8 CUA252 flow assembly
9 CUS52D turbidity sensor
10 Transition to D 12
The lost water resulting from the bubble trap is not suitable for feedback into the
process.
For the hose system, use PVC hoses with an internal diameter of 12 mm (3/8").
Secure the hose system with worm drive hose clips (not included in the delivery).
The inlet and outlet connection of the flow assembly are always identical, the system is
symmetrical.
Install the flow assembly vertically.
The supply must be connected at the bottom (upward flow in the pipe).
Insert a orifice plate into the upper process connection (å6, item 7) of the flow
assembly to get the desired volume flow rate (included in the delivery):
• 1 mm for volume flow rate < 60 l/h (15.8 gal/hr)
• 3 mm for volume flow rate 60 to 100 l/h (15.8 to 26.4 gal/hr)
• 5 mm for volume flow rate > 100 l/h (26.4 gal/hr)
Avoid buckles and loops in the hose system.

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Pay attention to the installation instructions (flow direction) for the sensor.
Observe the maximum pressure and maximum temperature when operating the bubble
trap.
3.4 Sensor installation
Install the sensor so that the optical windows of the sensor (å8, item 1) are aligned
against the flow direction (item 2). The installation marking (item 3) helps you ensure the
correct sensor orientation.
3.5 Post-installation check
‣After installation, check all the connections to ensure they are secure and leak-tight.
‣Is the orientation correct?
‣Make sure that the hoses can only be removed by force.
‣Check all hoses for damage.
a0022864
Fig. 7: Sensor installation
10 CUA252 flow assembly
11 Clamp seal
12 Locking clamp
13 CUS52D turbidity sensor
a0022863
Fig. 8: Sensor orientation
1Opticalwindows
2 Flow direction
3 Installation marking

Commissioning Flowfit CUA252
14 Endress+Hauser
4 Commissioning
Prior to initial commissioning, make sure that:
• All the seals are seated correctly (on the assembly and the process connection)
• The sensor is correctly installed and connected
WARNING
!
Medium incorrectly connected to the assembly
Danger of medium leaking
‣Before applying pressure to an assembly, make sure the medium is connected correctly!
Otherwise do not introduce the assembly into the process!

Flowfit CUA252 Maintenance
Endress+Hauser 15
5Maintenance
You must perform maintenance tasks at regular intervals.
We recommend setting the maintenance times in advance in an operations journal or
calendar.
The maintenance cycle primarily depends on the following:
• The facility
• The installation conditions
• The medium being measured
CAUTION
!
Risk of injury if medium escapes
‣Prior to performing any maintenance task, make sure that the process pipe is
unpressurized, empty and rinsed.
5.1 Cleaning the assembly
• Use suitable cleaning solutions (see "Cleaning agents" section) to remove light dirt and
fouling.
• Heavy dirt can be removed with a soft brush and a suitable cleaning agent.
• To remove stubborn dirt, soak the parts in a cleaning solution. Then clean the parts with a
brush.
Six months is a typical cleaning interval for drinking water, for example.
5.2 Cleaning the sensor
Cleaning with the ultrasonic cleaning system
If the (optional) CYR52 ultrasonic cleaning system is installed, you can clean the sensor
surfaces during operation.
Enter the following parameters to prevent the ultrasonic transducer from overheating:
Cleaning without the ultrasonic cleaning system
If the assembly is not fitted with an ultrasonic cleaning system, you must remove the sensor
in order to clean it.
You must rinse the sensor thoroughly with water after cleaning it.
Cleaning time: max. 5 seconds
Cleaning interval: min. 5 minutes
Type of fouling Cleaning measure
Lime deposits Immerse the sensor in 1%-5 % hydrochloric acid (for a few minutes).
Dirt particles on the optical windows Use a cleaning cloth to clean the optical windows.

Maintenance Flowfit CUA252
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5.3 Cleaning agent
The choice of cleaning agent depends on the degree and type of fouling. The most common
types of dirt and fouling and the suitable cleaning agents are listed in the following table.
CAUTION
!
Solvents can pose a health hazard
‣Never use acetone or any organic solvents containing halogens. Such solvents can
damage plastic parts and some are suspected of causing cancer (e.g. chloroform).
5.4 Checking and replacing the seals
Check the seals at regular intervals and replace the seals where necessary.
a0022895
Fig. 9: Position of the seals
1Clampseal
2O-rings
The seals are available as a spare parts kit (see the "Spare parts kits" section).
Type of fouling Cleaning agent
Greases and oils Agents containing surfactants (alkaline agents) or water-soluble
organic solvents (halogen-free, e.g. ethanol)
Limescale deposits, metal hydroxide
buildup, lyophobic biological buildup
Approx. 3% hydrochloric acid
Sulfide deposits Mixture of 3% hydrochloric acid and thiocarbamide (commercially
available)
Protein buildup Mixture of 3% hydrochloric acid and pepsin (commercially available)
Fibers, suspended substances Pressurized water, possibly surface-active agent
Light biological buildup Pressurized water
1
22

Flowfit CUA252 Repair
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6Repair
6.1 Spare parts kits
Detailed information on the spare parts kits is available in the "Spare Part Finding Tool",
which can be accessed on the Web at:
www.products.endress.com/spareparts_consumables
6.2 Return
The product must be returned if repairs or a factory calibration are required, or if the wrong
product has been ordered or delivered. According to legal regulations Endress+Hauser, as an
ISO-certified company, is required to follow certain procedures when handling returned
products that are in contact with the medium.
To ensure swift, safe and professional device returns:
Visit our website to obtain information about the return procedure and basic conditions:
www.services.endress.com/return-material
6.3 Disposal
Comply with local regulations when disposing of the product.
Order number Description
71241882 Clamp seal, DN 50, FDA, 2 pcs
71241892 O-ring, EPDM, 2 set

Accessories Flowfit CUA252
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7 Accessories
7.1 Connection accessories
7.2 Bubble trap
Bubble trap
• For sensor CUS52D
• Process pressure: up to 3 bar (43.5 psi)
• Process temperature: 0 to 50 °C (32 to 122 °F)
• Adapter to D 12 with connection for vent line (top connection on CUA252), is included in
the delivery.
• Orifice plates for the following volume flow rates:
– < 60 l/h (15.8 gal/hr)
– 60 to 100 l/h (15.8 to 26.4 gal/hr)
– > 100 l/h (26.4 gal/hr)
• The vent line is fitted with a PVC hose, hose check valve and a Luer lock adapter.
• Order number, suitable for assembly CUA252: 71242170
• Order number, suitable for assembly S of CUS31: 71247364
a0022631
Fig. 10: Bubble trap, dimensions in mm (inch)
1 Medium inlet (without hose system)
2 Air bubble exit (hose system is included in the delivery)
3 Medium exit (without hose system)
Description Order number
Dummy cover for clamp connection; 1 pc 71242180
Adapter, internal thread, RP ¾", material: PE; 1 pc 71242172
Adapter, internal thread, NPT ¾", material: PE; 1 pc 71242173
Adapter, welded connection, D 25, material: PE; 1 pc 71242174
Adapter, hose connection nipple, D 25, material: PE; 1 pc 71242175
Adapter, hose connection nipple, D 12, material: PE; 1 pc 71242176
Adapter, flange ANSI 2", 1 pc 71242177
254 (10.0)
12 (3/8")
12 (3/8")
12
3

Flowfit CUA252 Accessories
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7.3 Wall mounting kit
Wall mounting kit for CUA252
• Order number: 71242171
a0022264
Fig. 11: Wall mounting kit
1 Hanger bolt STST 10x60 mm (included in the delivery)

Technical data Flowfit CUA252
20 Endress+Hauser
8Technicaldata
8.1 Environment
Ambient temperature
range
0 to 55 °C (32 to 131 °F)
Storage temperature 0 to 60 °C (32 to 140 °F), in the original packaging
8.2 Process
Process temperature 0 to 60 °C (32 to 140 °F)
Process pressure 0 to 6 bar (0 to 87 psi)
Pressure-temperature
chart
a0022626
Fig. 12: Pressure-temperature chart
Flow velocity Max. 2 m/s (6.6 ft/s) for low-viscosity media in pipe DN 50
Flow Recommended flow: 60 l/h (15.84 gal/hr)
Range: 10 to 100 l/h (2.64 to 26.4 gal/hr)
When operating with lost sample (lost water)
Pressure loss < 0.05 bar (0.7 psi) for flow up to 100 l/h (26.4 gal/hr)
p [bar]
T[°C]
10 4030
4
20
T[°F]
p [psi]
58
0
32
00
6
87
50 60
50 68 86 104 122 140