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Technical Information
Flowfit COA250
Flow assembly for oxygen sensors
Assembly for unsupported installation in pipes or wall mounting
Application
The flow assembly COA250 has been specially designed to hold
oxygen sensors with a diameter of 40mm (1.57 inch). It can be
used wherever normal sensor immersion is either impossible or
undesirable.
Main areas of application are:
• Wastewater treatment
• Drinking water
• Monitoring of surface waters
• Analysis stations
• Process applications
Your benefits
• Simple wall installation or unsupported installation in pipes
• Automatic self-venting due to bottom inlet/top outlet design
• Quick oxygen sensor response is assured by minimized inside
volume
• Construction is insensitive to clogging
• Oxygen sensor can be easily removed for calibration in air
• Allows connection of a spray head for sensor membrane
cleaning during operation
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Function and system design
Measuring system A complete measuring system comprises:
• Flowfit COA250
• Oxygen sensor, e.g. COS31, COS41, COS61 or COS51D
• Measuring cable, e.g. CYK10
• Transmitter, e.g. Liquiline M CM42
Optional:
• Junction box for cable extension, e.g. RM junction box
Flowfit COA250
12
6
5
Fig. 1: Measuring system
1 Process line with bypass and valves
2 Supply line of the transmitter
3 Transmitter Liquiline M CM42
4 Measuring cable CYK10
5 Flowfit COA250
6 Oxygen sensor COS51D
3
4
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Flowfit COA250
Installation
Installation instructions To get a flow through the bypass, pressure p1 has to be higher than pressure p2. Therefore, you have to install
an aperture in the main conduit (→ å 2).
p1
Fig. 2: Installation example with bypass and aperture in the main conduit
p2
In case of an open outlet installation, no pressure increasing procedure is needed (→ å 3).
p1>p2
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Fig. 3: Installation example with open outlet
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Environment
Ambient temperature range 0 ... 50 °C (32 ... 120 °F)
Storage temperature 0 ... 50 °C (32 ... 120 °F)
Process
Process temperature range 0 to 50 °C (32 to 120 °F), non-freezing
Process pressure max. 6 bar (87 psi) at 20 °C (68 °F) and 4 bar (58 psi) at 50 °C (122 °F)
Temperature-Pressure diagram
Flowfit COA250
Fig. 4: Temperature-Pressure diagram
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Flowfit COA250
Design, dimensions
Mechanical construction
Fig. 5: Dimensions
* with long sensor sleeve (COA250-B)
** with short sensor sleeve (COA250-A)
Weight 0.5 to 0.8 kg (1.1 to 1.8 lbs), depending on process connection
Materials EPDM (sealings)
PVC
Process connection G¾ (for usual fittings)
Suitable sensors Amperometric and optical sensors with Ø40 mm (1.57 inch) and G1 thread
Installation lengths
• COA250-A: 110 to 150 mm (4.3 to 5.9 inch), e.g. COS 3 / 3HD / 4 / 4HD / 41 / 51D
• COA250-B: 140 to 190 mm (5.5 to 7.5 inch), e.g. COS 31 / 61
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Ordering information
Flowfit COA250
Product structure
COA250- complete order code
Scope of delivery The scope of delivery comprises:
• Flowfit assembly (ordered version)
• Operating Instructions (English)
Version
A Short sensor sleeve for COS41 / 51D / 3 / 3HD / 3S / 4 / 4HD
B Long sensor sleeve for COS31 / 61
Accessories
!
Accessories kits Long sensor sleeve
Sensors Oxymax W COS31
Note!
In the following sections, you find the accessories available at the time of issue of this documentation.
For information on accessories that are not listed here, please contact your responsible service.
• For later installation of sensor COS31 / 61 into COA250-A assembly
• order no. 51507172
Pipe clamp COY250
• For panel or wall mounting
• order no. 50065132
• Oxygen sensor for drinking water and wastewater measurements, potentiostatic amperometric principle
• Material: stainless steel 1.4571 (AISI 316 Ti)
• Ordering acc. to product structure, see Technical Information (TI285C/07/en)
Oxymax W COS41
• Oxygen sensor for drinking water and wastewater measurements, amperometric principle
• Material: POM
• Ordering acc. to product structure, see Technical Information (TI284C/07/en)
Oxymax W COS51D
• Amperometric sensor for dissolved oxygen, with Memosens technology
• Ordering acc. to product structure, see Technical Information (TI413C/07/en)
Oxymax W COS61
• Optical oxygen sensor for drinking water and wastewater measurements, fluorescence quenching principle
• Material: stainless steel 1.4571 (AISI 316 Ti)
• Ordering acc. to product structure, see Technical Information (TI387C/07/en)
Cleaning systems Chemoclean CUR3
• Spray head for flow assemblies CUA250 and COA250
• order no. CUR3-1
Chemoclean
• Injector CYR10 and programme sequencer CYR20
• Ordering acc. to product structure, see Technical Information (TI046C/07/en)
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Flowfit COA250
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Instruments International
Endress+Hauser
Instruments International AG
Kaegenstrasse 2
4153 Reinach
Switzerland
Tel.+41 61 715 81 00
Fax+41 61 715 25 00
www.endress.com
info@ii.endress.com
TI111C/07/en/02.07
50068520
FM+SGML 6.0 / ProMoDo / Printed in Germany / DT
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