Specs at a glance
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Measuring range
0.000 to 5000 PAHphe
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Process temperature
-5 to 55 °C (20 to 130 °F)
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Process pressure
10 bar abs. (just the sensor)
6 bar abs. (combination sensor and assembly)
Field of application
The rugged and low-maintenance Memosens CFS51 fluorescence sensor measures polycyclic aromatic hydrocarbons (PAHs) in accordance with MEPC.259(68) and MEPC.340(77). Thanks to the practical solid-state reference, you can readjust and calibrate the sensor onboard the vessel - supported by user-friendly guidance in the transmitter menu. This makes the calibration procedure simple and error-free, and you benefit from an exceptionally long factory maintenance interval of 4 years.
Memosens CFS51 measures PAHs with high accuracy in both the inlet and outlet of marine exhaust gas cleaning systems (scrubbers) and is suitable for all discharge water flow rates.
The sensor is certified by the following approval bodies:
DNV (Det Norske Veritas)
LR (Lloyd’s Register)
BV (Bureau Veritas)
ABS (American Bureau of Shipping)
For washwater monitoring in EGCS, the PAH sensor is also available as an approved all-in-one solution including pH and turbidity measurement.
Benefits
The uniquely long factory maintenance interval saves you a lot of costs and organizational effort
The optionally available flow assembly holds the sensor at the ideal installation angle to minimize disturbing influences caused by air bubbles. In addition, it can be tilted for quick mounting and dismounting of the sensor.
DNV approved integrated turbidity correction in the range of 0-50 FNU
High material compliance of sensor and flow assembly according to IACS E10 (flame retardancy)
The solid-state reference makes calibration very easy for the end user - and you can completely eliminate the need for toxic phenantrene, which increases safety for your employees and the environment
The suitability of the solid-state reference for calibration and readjustment of the PAH sensor on board was confirmed by DNV
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Specialized products
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| FLEX selections | Technical excellence | Simplicity |
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Fundamental selection Meet your basic measurement needs |
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Success stories
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Technical Information (TI)
TI Memosens CFS51
Sensor for fluorescence measurement
EN 01/10/202508/04/202414/06/2022Language:
English
Version:
01/10/2025
File size:
1 MB
File name:
TI01630CEN_0425-00.pdf
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Operating Instruction (BA)
BA Memosens CFS51
Sensor for fluorescence measurement
EN 30/09/202514/03/202414/06/2022Language:
English
Version:
30/09/2025
File size:
1.9 MB
File name:
BA02165CEN_0425-00.pdf
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Installation Instructions (EA)
EA Flow assembly kit for CFS51
Retrofit kit / replacement for flow assembly of CFS51
EN 05/04/202413/10/202304/07/202230/03/2022Language:
English
Version:
05/04/2024
File size:
2.2 MB
File name:
EA01423CEN_0524-00.pdf
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Installation Instructions (EA)
Kit Durchflussarmatur für CFS51
Nachrüstung / Ersatz für Durchflussarmatur von CFS51
Language:
German
Version:
30/03/2022
File size:
2.4 MB
File name:
EA01423CDE_0122-00.pdf
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Innovation (IN)
Memosens CFS51
Low-maintenance PAHsensor for wash water monitoring in marine
exhaust gas cleaning systemsLanguage:
English
Version:
22/10/2025
File size:
2.2 MB
File name:
IN01197C_Memosens CFS51_EN.pdf
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EU Declaration
Product family: Memosens
Product root: CFS51-
Declaration number: EU_01051_01.22EN 19/07/2022Language:
English
Version:
19/07/2022
File size:
290.1 KB
File name:
EU_01051_01.22.pdf
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UK Conformity Assessed
Product family: Memosens
Product root: CFS51-
Declaration number: UK_00498_01.22Language:
English
Version:
19/07/2022
File size:
286.3 KB
File name:
UK_00498_01.22.pdf
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Miscellaneous
Product family: Memosens
Product root: CFS51-
Region: Eurasian Economic Union
Approval agency: EAC
Approval number: ЕАЭС KZ 7500525.13.12.00630Language:
Russian
Version:
07/02/2025
File size:
1.1 MB
File name:
EAC KZ 7500525.13.12.00630.pdf
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Marine
Product family: InduMax P, Memosens, Turbimax
Product root: CFS51-, CLS21E-, CLS50D-, CPF81E-, CPS11E-, CPS12E-, CUS50D-, CUS52D-, OCPS11E-
Region: International
Approval agency: LRLanguage:
English
Version:
04/05/2025
File size:
1.1 MB
File name:
Sensors_LR25210187TA_Type Approval Certificate.pdf
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Marine
Product family: Memosens
Product root: CFS51-
Region: International
Approval agency: BVLanguage:
English
Version:
13/01/2025
File size:
1.1 MB
File name:
71631_A1 BV.pdf
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