CCS51

Summary

Product identification

• Product name: CCS51
• Product type: Sensor for determining free chlorine
• Document Title: CCS51
• Document Number: TI01424C/07/EN/01.18
• Revision Date: 2018-09-20

Application

The CCS51 is a free chlorine sensor designed for skid builders and end customers. It is suitable for measuring free chlorine in:

• Drinking water
• Food industry
• Utilities
• Pool water

Function and system design

Measuring principle

The sensor uses an amperometric measuring principle to determine free chlorine levels, based on hypochlorous acid (HOCl). HOCl diffuses through a sensor membrane and is reduced at a gold cathode, while silver is oxidized at a silver anode. The resulting current is proportional to the free chlorine concentration. A pH measurement is used to compensate for the dependency of HOCl concentration on pH. The transmitter calculates the concentration in mg/l (ppm) from the current signal.

The sensor comprises a membrane cap (measuring chamber with membrane) and a sensor shaft with an anode and a cathode embedded in plastic. The electrodes are separated from the medium by a membrane which prevents electrolyte leakage and contamination. Calibration is performed by colorimetric comparison measurement using the DPD method.

A complete measuring system includes the CCS51 sensor, a Flowfit CCA250 flow assembly, and a transmitter (e.g., Liquisys CCM223/253). Optional components include an immersion assembly (Flexdip CYA112) and a proximity switch.

Input

Measured variables

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

Measuring ranges

• CCS51-**11AD*: 0 to 5 mg/l (ppm) HOCl
• CCS51-**11BF*: 0 to 20 mg/l (ppm) HOCl

Signal current

• CCS51-**11AD*: 33 to 63 nA per 1 mg/l (ppm) HOCl
• CCS51-**11BF*: 9 to 18 nA per 1 mg/l (ppm) HOCl

Electrical

• Sensor cable length: Maximum 3 m (9.8 ft)

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

• T90: < 25 s (after completing polarization)

Measured value resolution of sensor

• CCS51-**11AD*: 0.03 µg/l (ppb) HOCl
• CCS51-**11BF*: 0.13 µg/l (ppb) HOCl

Measured error

• ±2 % or ±5 µg/l (ppb) of value measured (whichever is higher)

LOD (limit of detection)

• CCS51-**11AD*: 0.002 mg/l (ppm)
• CCS51-**11BF*: 0.002 mg/l (ppm)

LOQ (limit of quantification)

• CCS51-**11AD*: 0.005 mg/l (ppm)
• CCS51-**11BF*: 0.007 mg/l (ppm)

Repeatability

• CCS51-**11AD*: 0.0031 mg/l (ppm)
• CCS51-**11BF*: 0.0035 mg/l (ppm)

Nominal slope

• CCS51-**11AD*: 48 nA per 1 mg/l (ppm) ClO₂
• CCS51-**11BF*: 14 nA per 1 mg/l (ppm) ClO₂

Long-term drift

• < 1 % per month (mean value)

Polarization time

• Initial commissioning: 60 min
• Recommissioning: 30 min

Operating time of the electrolyte

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

Installation

Orientation

• Install the sensor at an angle of at least 15° to the horizontal. Do not install upside-down.

Immersion depth

• 77 mm (3.03 in)

Installation in Flowfit CCA151 flow assembly

• Minimum flow rate: 5 l/h (1.32 gal/h)
• Counterpressure must not exceed 1 bar (14.5 psi) and must remain constant.
• Avoid negative pressure.
• Heavily contaminated water should be filtered.

Installation in Flowfit CCA250 flow assembly

• Minimum flow rate: 30 l/h (7.92 gal/h)
• Counterpressure must not exceed 1 bar (14.5 psi) and must remain constant.
• Avoid negative pressure.
• Flow regulation is provided by a needle valve in the range of 30 to 120 l/h (7.9 to 30 gal/h).

Installation in other flow assemblies

• Flow velocity at the membrane must be at least 15 cm/s (0.49 ft/s).
• Flow direction should be upwards, and air bubbles must be removed.
• Flow must be directed to the membrane.

Installation in Flexdip CYA112 immersion assembly

• Ensure sufficient flow towards the sensor.

Environment

Ambient temperature range

• -20 to +60 °C (-4 to 140 °F)

Storage temperature

• Longterm storage: +0 to 35 °C (32 to 95 °F) (non-freezing)
• Storage up to max 48 h: 35 to 50 °C (95 to 122 °F) (non-freezing)
• Without electrolyte: –20 to 60 °C (–4 to 140 °F)

Degree of protection

• IP 68 (1.8 m (5.91 ft) water column over 7 days at 20 °C (68 °F))

Process

Process temperature

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

Process pressure

• Medium pressure directly upstream from the sensor membrane must not exceed 1 bar (14.5 psi) abs.

Flow velocity

pH range

• Calibration: pH 4 to 8
• Measurement: pH 4 to 9

Mechanical construction

Dimensions

• See technical drawing (dimensions in mm (in)).

Weight

• Sensor with membrane cap and electrolyte (without protection cap and without adapter): Approx. 250 g (8.82 oz)

Materials

• Sensor shaft: PVC
• Cable sheathing: PVC
• Membrane: PVDF
• Membrane cap: PVDF
• Protection cap: PC Makrolon (polycarbonate), Kraiburg TPE TM5MED (seal), PC Makrolon (polycarbonate) (cover)
• Sealing ring: FKM

Certificates and approvals

• CE mark
• Declaration of Conformity: Product meets the requirements of harmonized European standards and EU directives.

Scope of delivery

• Disinfection sensor (membrane-covered, ⌀25 mm) with protection cap (ready for use)
• Bottle of electrolyte (50 ml (1.69 fl.oz))
• Replacement membrane cap in protection cap
• Operating Instructions

Accessories

• Maintenance kit CCV05: Contains membrane caps, electrolyte, and sealing sets.
• Flowfit CCA151: Flow assembly.
• Flowfit CCA250: Flow assembly for chlorine and pH/ORP sensors.
• Flexdip CYA112: Immersion assembly.
• Photometer PF-3: Compact hand-held photometer for determining free available chlorine.
• Adapter kit CCS5x(D) for CCA250: Adapter including O-rings and studs.
• Adapter kit CCS5x(D) for CYA112: Adapter including O-rings and studs.
• COY8: Zero-point gel for oxygen and chlorine sensors.

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