Endress+Hauser CCS50D Manuale utente

Products Solutions Services

Operating Instructions

CCS50D

Digital sensor with Memosens technology for

determining chlorine dioxide

BA01773C/07/EN/02.19

71431040

2019-02-08

CCS50D Table of contents

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Table of contents

1 About this document ........... 4

1.1 Warnings ........................... 4

1.2 Symbols used ........................ 4

2 Basic safety instructions ....... 6

2.1 Requirements for the personnel ........ 6

2.2 Designated use ...................... 6

2.3 Workplace safety .................... 6

2.4 Operational safety ................... 7

2.5 Product safety ....................... 7

3 Product description ............. 8

3.1 Product design ....................... 8

4 Incoming acceptance and

product identification ......... 13

4.1 Incoming acceptance ................ 13

4.2 Product identification ................ 13

5 Installation .................... 15

5.1 Installation conditions ............... 15

5.2 Mounting the sensor ................ 17

5.3 Post-installation check ............... 24

6 Electrical connection .......... 25

6.1 Connecting the sensor ............... 25

6.2 Ensuring the degree of protection ..... 25

6.3 Post-connection check ............... 26

7 Commissioning ................ 27

7.1 Function check ..................... 27

7.2 Sensor polarization .................. 27

7.3 Sensor calibration ................... 27

8 Diagnostics and

troubleshooting ............... 29

9 Maintenance .................. 31

9.1 Maintenance schedule ............... 31

9.2 Maintenance tasks .................. 32

10 Repair .......................... 39

10.1 Spare parts ........................ 39

10.2 Return ............................ 39

10.3 Disposal ........................... 39

11 Accessories .................... 40

11.1 Maintenance kit CCV05 .............. 40

11.2 Device-specific accessories ............ 40

12 Technical data ................. 41

12.1 Input .............................. 41

12.2 Performance characteristics .......... 43

12.3 Environment ....................... 44

12.4 Process ............................ 44

12.5 Mechanical construction ............. 45

13 Installation and operation in

hazardous environment Class

I Div. 2 .......................... 46

Index ................................. 48

About this document CCS50D

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1 About this document

1.1 Warnings

Structure of information Meaning

LDANGER

Causes (/consequences)

If necessary, Consequences of non-

compliance (if applicable)

‣Corrective action

This symbol alerts you to a dangerous situation.

Failure to avoid the dangerous situation will result in a fatal or serious injury.

LWARNING

Causes (/consequences)

If necessary, Consequences of non-

compliance (if applicable)

‣Corrective action

This symbol alerts you to a dangerous situation.

Failure to avoid the dangerous situation can result in a fatal or serious injury.

LCAUTION

Causes (/consequences)

If necessary, Consequences of non-

compliance (if applicable)

‣Corrective action

This symbol alerts you to a dangerous situation.

Failure to avoid this situation can result in minor or more serious injuries.

NOTICE

Cause/situation

If necessary, Consequences of non-

compliance (if applicable)

‣Action/note

This symbol alerts you to situations which may result in damage to property.

1.2 Symbols used

Symbol Meaning

Additional information, tips

Permitted or recommended

Not permitted or not recommended

Reference to device documentation

Reference to page

Reference to graphic

 Result of a step

CCS50D About this document

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1.2.1 Symbols on the device

Symbol Meaning

Reference to device documentation

Basic safety instructions CCS50D

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2 Basic safety instructions

2.1 Requirements for the personnel

Installation, commissioning, operation and maintenance of the measuring system may be

carried out only by specially trained technical personnel.

‣The technical personnel must be authorized by the plant operator to carry out the specified

activities.

‣The electrical connection may be performed only by an electrical technician.

‣The technical personnel must have read and understood these Operating Instructions and

must follow the instructions contained therein.

‣Measuring point faults may be repaired only by authorized and specially trained personnel.

Repairs not described in the Operating Instructions provided must be carried out only

directly at the manufacturer's site or by the service organization.

2.2 Designated use

Drinking water and industrial water must be disinfected through the addition of appropriate

disinfectants such as chlorine gas or inorganic chlorine compounds. The dosing quantity must

be adapted to continuously fluctuating operating conditions. If the concentrations in the water

are too low, this could jeopardize the effectiveness of the disinfection. On the other hand,

concentrations which are too high can lead to signs of corrosion and have an adverse effect on

taste, as well as generating unnecessary costs.

The sensor was specifically developed for this application and is designed for continuous

measurement of chlorine dioxide in water. In conjunction with measuring and control

equipment, it allows optimal control of disinfection.

Use of the device for any purpose other than that described, poses a threat to the safety of

people and of the entire measuring system and is therefore not permitted.

The manufacturer is not liable for damage caused by improper or non-designated use.

2.2.1 Hazardous environment in accordance with cCSAus NI Cl. I, Div. 2 1)

1. The device must be installed in a housing or cabinet that can be accessed only by means

of a tool or key.

2. Pay attention to the control drawing and the specified application conditions in the

appendix of these Operating Instructions, and follow the instructions.

2.3 Workplace safety

As the user, you are responsible for complying with the following safety conditions:

• Installation guidelines

• Local standards and regulations

1) Only if connected to CM44x(R)-CD*

CCS50D Basic safety instructions

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Electromagnetic compatibility

• The product has been tested for electromagnetic compatibility in accordance with the

applicable European standards for industrial applications.

• The electromagnetic compatibility indicated applies only to a product that has been

connected in accordance with these Operating Instructions.

2.4 Operational safety

Before commissioning the entire measuring point:

1. Verify that all connections are correct.

2. Ensure that electrical cables and hose connections are undamaged.

3. Do not operate damaged products, and protect them against unintentional operation.

4. Label damaged products as defective.

During operation:

‣If faults cannot be rectified:

products must be taken out of service and protected against unintentional operation.

2.4.1 Special instructions

‣Do not operate the sensors under process conditions where it is expected that osmotic

conditions will cause electrolyte components to pass through the membrane and into the

process.

Use of the sensor for its intended purpose in liquids with a conductivity of at least 10 nS/cm

can be classified as safe in terms of the application.

2.5 Product safety

The product is designed to meet state-of-the-art safety requirements, has been tested, and

left the factory in a condition in which it is safe to operate. The relevant regulations and

European standards have been observed.

Product description CCS50D

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3 Product description

3.1 Product design

The sensor consists of the following functional units:

• Membrane cap (measuring chamber with membrane)

– Separates the inner amperometric system from the medium

– With robust PVDF membrane and pressure relief valve

– Guarantees a defined and consistent electrolyte film between cathode and membrane

– With special support grid between cathode and membrane for a defined and consistent

electrolyte film and therefore a relatively constant reading at varying pressures and flows

• Sensor shaft with

– Large anode

– Cathode embedded in plastic

– Embedded temperature sensor

A0034227

 1 Sensor structure

1 Memosens plug-in head

2 Sensor shaft

3 Large anode, silver/silver chloride

4 Gold cathode

5 Grooves for installation adapter

6 Membrane cap with dirt-repellent

membrane

7 Pressure relief valve (elastic)

8 Sensor membrane

3.1.1 Measuring principle

Chlorine dioxide levels are determined in accordance with the amperometric measuring

principle.

The chlorine dioxide (ClO2) in the medium diffuses through the sensor membrane and is

reduced to chloride ions (Cl-) at the gold cathode. At the silver anode, silver is oxidized to

CCS50D Product description

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silver chloride. Electron donation at the gold cathode and electron acceptance at the silver

anode cause a current to flow which is proportional to the concentration of chlorine dioxide in

the medium. This process does not depend on the pH value over a wide range.

The transmitter uses the current signal to calculate the measured variable for concentration in

mg/l (ppm).

3.1.2 Effects on the measured signal

pH value

pH dependency

pH value Result

< 3.5 Chlorine is produced if chloride (Cl-) is present in the medium at the same time. The strong cross-sensitivity

to chlorine dioxide causes an increase in the measured value.

3.5 to 9 The pH value does not affect measurement of the chlorine dioxide concentration in the medium.

> 9 Chlorine dioxide is unstable and decomposes.

Flow

The minimum flow velocity of the membrane-covered measuring cell is 15 cm/s (0.5 ft/s).

• When using the Flowfit CCA151 flow assembly, this corresponds to a flow rate of

5 l/h (1.3 gal/h).

• When using the CCA250 flow assembly, this corresponds to a flow rate of

30 l/h (7.9 gal/h) (upper edge of float at the height of the red bar mark).

Product description CCS50D

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100

relative slope / maximum slope in %

CCA151 ﬂow gal/hr

CCA250 ﬂow gal/hr

ﬂow velocity at the membrane "/s

0 0.5 1 1.5 2 3

0 5 10 25 40

012 3 4 5 6

2.5

15 20 30 35

A0034487-EN

 2 Correlation between slope of electrode and flow velocity at the membrane/flow rate in assembly

At higher flow rates, the measured signal is virtually flow-independent. However, if the flow

rate falls below the specified value, the measured signal depends on the flow.

The installation of an INS proximity switch in the assembly enables reliable detection of this

invalid operating status, thus triggering an alarm or causing the dosing process to be switched

off if necessary.

Below the minimum flow rate, the sensor current is more sensitive to flow fluctuations. For

abrasive media, it is recommended not to exceed the minimum flow. If suspended solids are

present, which may form deposits, the maximum flow rate is recommended.

Temperature

Changes in the temperature of the medium affect the measured value:

• Increases in temperature result in a higher measured value (approx. 4 % per K)

• Decreases in temperature result in a lower measured value.

Use of the sensor in combination with the Liquiline enables automatic temperature

compensation (ATC). Recalibration in the case of temperature changes is not necessary.

1. If automatic temperature compensation is disabled at the transmitter, the temperature

must be maintained at a constant level following calibration.

2. Otherwise, recalibrate the sensor.

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