Endress+Hauser COA250 Specifications

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

TI111C/07/en/02.07
50068520

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

a0007330

Fig. 3: Installation example with open outlet

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