Memosens CFS51

Summary

Product identification

Product: Memosens CFS51 Type: Sensor for fluorescence measurement Document: TI01630C/07/EN/03.23-00 Product Serial Number: 71653558

Application

The sensor is designed for measuring polycyclic aromatic hydrocarbons (PAHs) in water using fluorescence measurement. It is suitable for monitoring scrubber washwater on ships, adhering to standards MEPC.259(68) and MEPC.340(77).

Your benefits

• Measures PAH according to MEPC.259(68) and MEPC.340(77) across all scrubber sizes.
• High accuracy.
• Constructed from largely seawater-resistant and low-flammability materials according to IACS E10.
• Long service intervals due to approved calibration and adjustment.
• "Plug and play" functionality with Memosens technology.

Function and system design

Measuring principle

The device uses UV light to stimulate PAHs and detects the emitted fluorescent radiation. The PAH concentration is measured in units of phenanthrene equivalents (PAHphe), with excitation at 254 nm and reception up to 360 nm.

Measuring system

A complete measuring system includes the sensor, a Liquiline CM44x multi-channel transmitter, and a flow assembly. The assembly is designed with an integrated bubble trap, which functions optimally at flow rates of at least 100 l/h (26.4 gal/h).

Communication and data processing

Memosens technology

Digital sensors with Memosens technology store calibration data and operating information internally. This allows for quick sensor replacement and independent calibration at a separate location. Data is transferred automatically to the transmitter upon connection.

Input

• Measured variable: PAH concentration in phenanthrene equivalents (PAHphe), Temperature.
• Measuring range: 0 to 5,000 µg/l PAHphe.

Electrical connection

• Maximum cable length: 100 m (328.1 ft).
• Available fixed cable lengths: 3 m (9.84 ft), 7 m (22.97 ft), 15 m (49.22 ft).
• Connection options: M12 plug or wire end ferrules for transmitter input.

Performance characteristics

• Maximum measurement error: < 5 % of reading or 6.7 μg/l at 20 °C (68 °F).
• Measured value stability over temperature: < 5 % of reading (measured with solid state reference at 100 μg/l in the temperature range from –5 to 55 °C (23 to 131 °F)).
• Repeatability: < 1 % of reading or 1 μg/l PAHphe (the larger value applies).
• Long-term reliability (Relative measured value deviation per year): < 5%.
• Response time: < 10 seconds (adjustable).
• Detection limit (in ultrapure water): 2 μg/l PAHphe.
• Turbidity compensation:
  • Measured error (off): 0 to 5 FNU, < 5 % of measured value.
  • Measured error (on): 0 to 50 FNU, < 5 % of measured value.

Mounting

The sensor can be mounted in a flow assembly or directly into a vessel. An angle of inclination can be set to mitigate air bubble formation. When mounting without a flow assembly, ensure the optical window is always fully immersed and maintain a distance of at least 80 mm (3.15 in) from the vessel bottom.

Environment

• Ambient temperature range:
  • Sensor: –20 to 60 °C (–4 to 140 °F).
  • Solid state reference: –5 to 60 °C (23 to 140 °F), without condensation.
• Storage temperature: –20 to 70 °C (–4 to 158 °F).
• Degree of protection: IP 68, IP 66, Type 6P.
• Process temperature range: –5 to 55 °C (20 to 130 °F).
• Process pressure range:
  • Sensor: 0.5 to 10 bar (7.3 to 145 psi).
  • Sensor with assembly: 0.5 to 6 bar (7.3 to 87 psi).
• Flow limit: No minimum flow required.

Mechanical construction

• Dimensions: See diagrams 8-13 for detailed sensor, clamping ring, assembly, and solid state reference dimensions.
• Weight:
  • Sensor without clamping ring: 0.69 kg (1.52 lb).
  • Sensor with clamping ring: 0.78 kg (1.72 lb).
• Materials:
  • Sensor Housing: Titanium 3.7035.
  • Optical window: Sapphire.
  • O-rings: FKM, EPDM.
  • Assembly Flow cell: Black PEHD.
  • Assembly O-rings: FKM.
  • Clamping ring: Titanium 3.7035.
• Process connections:
  • Sensor: G1" and NPT ¾".
  • Assembly: G1/4" DN 4/6 (cleaning), G1/4" DN6/8 (process).

Certificates and approvals

The product has marine approvals from ABS, BV, DNV, and LR. Further certificates and approvals can be found on www.endress.com.

Ordering information

• Scope of delivery: Sensor (as ordered), Operating Instructions.
• Product page: www.endress.com/cfs51.
• Accessories: Flow assembly (Order No. 71546713) with a process pressure range of 6 bar (87 psi) and a flow rate of 40 to 120 l/h (10.6 to 31.7 gal/h).

---

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