FlowFit COA250

Summary

Product identification

Flowfit COA250 is a flow assembly designed for oxygen sensors with a diameter of 40 mm (1.57 inch). It is suitable for applications where direct sensor immersion is not feasible or desired.

Main areas of application:

• Wastewater treatment
• Drinking water
• Monitoring of surface waters
• Analysis stations
• Process applications

Benefits:

• Simple wall or unsupported pipe installation.
• Automatic self-venting due to bottom inlet/top outlet design.
• Minimized internal volume ensures quick oxygen sensor response.
• Construction is resistant to clogging.
• Oxygen sensor can be easily removed for calibration.
• Allows connection of a spray head for sensor membrane cleaning.

Function and system design

Measuring system components:

• Flowfit COA250
• Oxygen sensor (e.g., COS31, COS41, COS61, COS51D)
• Measuring cable (e.g., CYK10)
• Transmitter (e.g., Liquiline M CM42)
• Optional: Junction box for cable extension (e.g., RM junction box)

Operating limits

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)
  • max. 4 bar (58 psi) at 50 °C (122 °F)

Mechanical / hydraulic

Design and dimensions:

• 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 (short sensor sleeve): 110 to 150 mm (4.3 to 5.9 inch)
  • Example sensors: COS 3 / 3HD / 4 / 4HD / 41 / 51D
• COA250-B (long sensor sleeve): 140 to 190 mm (5.5 to 7.5 inch)
  • Example sensors: COS 31 / 61

Accessories

Accessory kits:

• Long sensor sleeve (Order No. 51507172): For later installation of sensor COS31 / 61 into COA250-A assembly.
• Pipe clamp COY250 (Order No. 50065132): For panel or wall mounting.

Cleaning systems:

• Chemoclean CUR3: Spray head for flow assemblies CUA250 and COA250 (Order No. CUR3-1).
• Chemoclean: Injector CYR10 and programme sequencer CYR20.

Disclaimer: This extraction may miss figures, footnotes, or revisions. Contractual data must match the OEM PDF revision used on the project.

Official datasheet (PDF)

Lenntech datasheet mirror