Memosens CCS51E

Summary

Product identification

• Product Name: Memosens CCS51E
• Description: Digital sensor with Memosens technology for determining free chlorine.
• Document Revision: TI01768C/07/EN/01.23-00, dated 2023-10-13

Application

The Memosens CCS51E sensor is suitable for measuring free chlorine in various water qualities, including:

• Drinking water
• Utilities
• Process water for food and beverage packaging
• Swimming pools

Measuring principle

The sensor uses an amperometric measuring principle to determine free chlorine via hypochlorous acid (HOCl). HOCl diffuses through a membrane and is reduced at a gold working electrode, while silver is oxidized at a silver counter electrode, generating a current proportional to the free chlorine concentration. An additional pH measurement is recommended for compensation due to HOCl's dependence on pH. The transmitter converts the current signal to a concentration value (mg/l or ppm).

Cross-sensitivity

The sensor exhibits cross-sensitivities to:

• Chlorine dioxide
• Ozone
• Free bromine

There are no cross-sensitivities to H₂O₂ or peracetic acid.

Measuring system

A complete measuring system includes:

• Memosens CCS51E disinfection sensor (membrane-covered, ⌀25 mm)
• Appropriate mounting adapter (e.g., Flowfit CYA27 flow assembly or Flexdip CYA112 immersion assembly)
• Memosens measuring cable (CYK10 or CYK20)
• Transmitter (e.g., Liquiline CM44x or CM44xR with specific firmware)
• Optional accessories like extension cables or pH sensors.

Input

Measured variables

• Free chlorine (HOCl) in mg/l, μg/l, ppm, ppb
• Temperature in °C, °F

Measuring range

• CCS51E-**11AD** : 0 to 5 mg/l (ppm) HOCl
• CCS51E-**11BF** : 0 to 20 mg/l (ppm) HOCl
• CCS51E-**11CJ** : 0 to 200 mg/l (ppm) HOCl

Signal current

• CCS51E-**11AD** : 33 to 63 nA per 1 mg/l (ppm) HOCl
• CCS51E-**11BF** : 9 to 18 nA per 1 mg/l (ppm) HOCl
• CCS51E-**11CJ** : 9 to 18 nA per 1 mg/l (ppm) HOCl

Performance characteristics

Reference operating conditions

• Temperature: 20 °C (68 °F)
• pH value: pH 5.5 ±0.2
• Flow: 40 to 60 cm/s
• Medium: HOCl-free base medium (Mains water)

Response time

• T<0xE2><0x82><0x90> < 25 s (after polarization completion)

Polarization time

• Initial commissioning: 45 min
• Recommissioning: 20 min

Measured value resolution of sensor

• CCS51E-**11AD** : 0.03 µg/l (ppb) HOCl
• CCS51E-**11BF** : 0.13 µg/l (ppb) HOCl
• CCS51E-**11CJ** : 1.10 µg/l (ppb) HOCl

Measurement error (LOD / LOQ, based on ISO 15839)

• CCS51E-**11AD** : LOD 0.002 mg/l, LOQ 0.005 mg/l
• CCS51E-**11BF** : LOD 0.002 mg/l, LOQ 0.007 mg/l
• CCS51E-**11CJ** : LOD 0.008 mg/l, LOQ 0.027 mg/l

Repeatability

• CCS51E-**11AD** : 0.0031 mg/l (ppm)
• CCS51E-**11BF** : 0.0035 mg/l (ppm)
• CCS51E-**11CJ** : 0.062 mg/l (ppm)

Nominal slope

• CCS51E-**11AD** : 48 nA per 1 mg/l (ppm) HOCl
• CCS51E-**11BF** : 14 nA per 1 mg/l (ppm) HOCl
• CCS51E-**11CJ** : 14 nA per 1 mg/l (ppm) HOCl

Long-term drift

• < 1 % per month (mean value)

Operating time of the electrolyte

• At 10% of measuring range and 20 °C: 2 years
• At 50% of measuring range and 20 °C: 1 year
• At maximum concentration and 55 °C: 60 days

Installation

Orientation

The sensor must be installed at an angle of at least 15° to the horizontal. Installation upside-down is not permitted.

Immersion depth

• At least 50 mm (1.97 in), corresponding to the mark on the sensor.

Installation instructions

• Flowfit CYA27: Ensure minimum flow of 15 cm/s (0.49 ft/s) and minimum volume flow (5 l/h or 30 l/h depending on version). Maximum permissible backpressure is 1 bar relative. Avoid negative pressure. Filter heavily contaminated water.
• Other flow assemblies: Ensure a minimum flow velocity of 15 cm/s at the membrane, upward flow direction, and direct exposure of the membrane to the flow.
• CYA112 immersion assembly: Ensure sufficient flow towards the sensor.

Environment

Ambient temperature

• –20 to 60 °C (–4 to 140 °F)

Storage temperature

• Long-term (up to 2 years): 0 to 35 °C (32 to 95 °F) (non-freezing)
• Short-term (up to 48 h):
  • With electrolyte: 0 to 35 °C (32 to 95 °F)
  • Without electrolyte: –20 to 60 °C (–4 to 140 °F)

Degree of protection

• IP68 (submersible up to 1.8 m for 7 days at 20 °C)

Process

Process temperature

• 0 to 55 °C (32 to 130 °F), non-freezing

Pressure

• Up to 1 bar relative (14.5 psi relative) / 2 bar absolute (29 psi absolute). Measurement can occur with a free outlet.

pH range

• Range of effectiveness: pH 4 to 9
• Calibration: pH 4 to 8
• Measurement: pH 4 to 9

Conductivity

• Can be used in low conductivity media, but attention must be paid to reduced pH buffer capacity.

Flow

• Minimum flow velocities and volume flows:
  • Flowfit CYA27 (5 l version): 5 l/h (1.3 gal/h)
  • Flowfit CYA27 (30 l version): 30 l/h (7.9 gal/h)
  • Flexdip CYA112: 15 cm/s (0.5 ft/s)
• Maximum flow velocities:
  • Flowfit CYA27 (5 l version): 30 l/h
  • Flowfit CYA27 (30 l version): 60 l/h
  • Flexdip CYA112: 80 cm/s

Mechanical construction

Dimensions

• See diagram in the original document (overall length approximately 161 mm).

Weight

• Approximately 95 g (3.35 oz) (sensor with membrane cap and electrolyte, without protection cap and adapter).

Materials

• Sensor shaft: POM
• Membrane: PVDF
• Membrane cap: PVDF
• Protective cap: PC Makrolon (vessel, cover), Kraiburg TPE TM5MED (seal)
• Sealing ring: FKM
• Sensor shaft coupling: PPS

Cable specification

• Maximum cable length: 100 m (330 ft), including extension cables.

Accessories

Maintenance kit

• CCV05: Contains membrane caps and electrolyte.

Device-specific accessories

• Memosens data cables (CYK10, CYK11, CYK20)
• Flowfit CYA27 flow assembly
• Flexdip CYA112 immersion assembly
• Adapter kits for CYA27 and CYA112
• COY8 Zero-point gel

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