Endress+Hauser CYA251 Specifications
TI00495C/07/EN/03.19
71435030
2019-01-15
Products Solutions Services
Technical Information
CYA251
Flow assembly for nitrate/SAC, turbidity and oxygen
sensors
Application
The Flowfit CYA251 is a universal flow assembly for:
• Wastewater treatment plants:
– Treatment and monitoring of process water
– Monitoring of wastewater
• Drinking water and process water:
– Treatment and monitoring of process water
– Filter monitoring and filter backflushing
• All industrial utilities:
– Treatment and monitoring of process water
– Cooling water monitoring
It is suitable for:
• Nitrate/SAC: all measuring ranges
• Oxygen: all measuring ranges
• Turbidity: medium and high measuring ranges
Your benefits
• Easy to adapt to your system: process connections available
for almost all pipe diameters.
• Different installation options: suitable for pipe- and wallmounting.
• Fast measured values: shorter sensor response times thanks
to low internal volume.
• Easy and safe maintenance: automatic sensor cleaning
without interrupting the process.
• Robust design: suitable for process pressures up to 6 bar (87
psi).
Function and system design
1 2
3
4
5
6
CYA251
Measuring system
A complete measuring system comprises:
• Flowfit CYA251 flow assembly
• Transmitter, e.g. Liquiline CM442
• 40 mm sensor, e.g. CUS50D
• Measuring cable
1 Example of a measuring system
1 Process pipe
2 Liquiline CM442 transmitter
3 Measuring cable
4 Return line with shut-off valve
5 Flow assembly CYA251 with 40 mm sensor
6 Inlet with shut-off valve
A0037719
2 Endress+Hauser
CYA251
p1
p2
p1 > p2
1
p1
p2
p1 > p2
1
Installation
Installation instructions
To achieve flow through the assembly with a bypass, pressure p1 must be higher than pressure p2.
This can be achieved by installing an orifice plate in the main pipe.
A0037716
2 Connection example with bypass and orifice plate in the main pipe
1 Orifice plate
3 Connection example involving a bypass and an orifice plate in the main pipe (assembly rotated by 90°,
inlet at bottom)
1 Orifice plate
A0037717
No measures to increase pressure are required for branch pipes that branch off from the main pipe.
Endress+Hauser 3
4 Connection example involving an open outlet
CYA251
A0037718
Ambient temperature range
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 for connection to pipes and hoses.
Required at point of installation:
Required components Application
2 shut-off valves Bypass solution
1 shut-off valve Solution with open outlet
Orifice plate in the main pipe Bypass solution
Dirt filter (500 μm or finer) If the medium contains coarse particles of dirt
Pressure-reducing valve If the medium pressure exceeds the permitted value
Wall holder unit to secure the assembly Hose connection
Pipe or hose connections to the assembly All versions
Environment
0 to 50 °C (32 to 122 °F)
Storage temperature
0 to 50 °C (32 to 122 °F)
Process
Process temperature
Process pressure
4 Endress+Hauser
0 to 50 °C (32 to 122 °F), non-freezing
Maximum 6 bar (87 psi) at 20 °C (68 °F)
Maximum 4 bar (58 psi) at 50 °C (122 °F)
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