Xylem NiCaVis 705 IQ Operating Manual

OPERATING MANUAL

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NiCaVis 705 IQ

OPTICAL SENSOR FOR NITRATE AND CARBON SUM PARAMETERS

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NiCaVis 705 IQ

Copyright © 2017 Xylem Analytics Germany GmbH

Printed in Germany.

NiCaVis 705 IQ Contents

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Contents

1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.1 How to use this component operating manual . . . . . . . . . . . . . 5

1.2 Field of application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

1.3 Measuring principle of the sensor NiCaVis 705 IQ . . . . . . . . . . 6

1.4 Structure of the sensor NiCaVis 705 IQ . . . . . . . . . . . . . . . . . . 7

2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.1 Safety information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.1.1 Safety information in the operating manual . . . . . . . . . 8

2.1.2 Safety signs on the product . . . . . . . . . . . . . . . . . . . . . 8

2.1.3 Further documents providing safety information . . . 8

2.2 Safe operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

2.2.2 Requirements for safe operation . . . . . . . . . . . . . . . . . 9

2.2.3 Unauthorized use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.1 IQ SENSOR NET system requirements . . . . . . . . . . . . . . . . . . . 10

3.2 Scope of delivery of the NiCaVis 705 IQ . . . . . . . . . . . . . . . . . 10

3.3 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.3.1 Mounting the sensor . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.3.2 Mounting the shock protectors . . . . . . . . . . . . . . . . . . 13

3.3.3 Connecting the sensor to the IQ S

ENSOR NET . . . . . . 14

3.4 Initial commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

3.4.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . 16

3.4.2 Sensor structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.4.3 Settings for the main sensor . . . . . . . . . . . . . . . . . . . . 18

3.4.4 Settings for virtual sensors . . . . . . . . . . . . . . . . . . . . . 21

4 Measurement / Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

4.1 Determination of measured values . . . . . . . . . . . . . . . . . . . . . 23

4.2 Measurement operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

4.3 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

4.3.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

4.3.2 User calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

4.3.3 Sensor check/

Zero adjustment

. . . . . . . . . . . . . . . . . . 31

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5 Maintenance and cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

5.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .37

5.2 Sensor cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

5.2.1 Cleaning agents and accessories . . . . . . . . . . . . . . . . 37

5.2.2 General steps to be taken . . . . . . . . . . . . . . . . . . . . . . 38

5.2.3 Basic cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39

5.2.4 Cleaning the measuring gap . . . . . . . . . . . . . . . . . . . . 40

6 Spare parts, maintenance equipment, accessories . . . . . . . . 41

7 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

8 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

8.1 Measurement characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 46

8.2 Application characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

8.3 General data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

8.4 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

9 Indexes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

9.1 Explanation of the messages . . . . . . . . . . . . . . . . . . . . . . . . . .50

9.1.1 Error messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

9.1.2 Informative messages . . . . . . . . . . . . . . . . . . . . . . . . . 53

9.2 Status info . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

10 Appendix: Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

NiCaVis 705 IQ Overview

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1 Overview

1.1 How to use this component operating manual

Structure of the

IQ SENSOR NET

operating manual

Fig. 1-1 Structure of the

IQ SENSOR NET operating manual

The IQ SENSOR NET operating manual has a modular structure like the IQ SENSOR NET
itself. It consists of a system operating manual and the operating manuals of all
the components used.

Please file this component operating manual into the ring binder of the system
operating manual.

IQ Sensor Net Operating Manual

System

Operating

Manual

(Ring Binder)

IQ Sensor
Operating

Manual

MIQ Module

Operating

Manual

MIQ Terminal

Operating

Manual

Component Operating Manuals

Overview NiCaVis 705 IQ

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1.2 Field of application

The NiCaVis 705 IQ is an online sensor for the on-site determination of nitrate
and carbon sum parameters in waste water treatment plants.

The range of application comprises control, feedback control and monitoring.

Measuring location

Ultrasound cleaning

system

The ultrasound cleaning system ensures low maintenance and long-term reli­able measurement operation.
The ultrasound source integrated in the sensor excites the measurement
windows to produce vibrations in the ultrasound range. The
movement of the surface as a result of this prevents the growth of
pollution in almost all cases and, thus, ensures reliable measured
values during continuous operation.

Compressed air

cleaning (option)

The sensor is designed to be equipped with an additional compressed air-driven
cleaning system, which supports the ultrasound cleaning system as necessary.

1.3 Measuring principle of the sensor NiCaVis 705 IQ

The sensor operates according to the measuring principle of UV-VIS- spectrom­etry.

Any substance present in a measuring solution attenuates a light beam that
penetrates the measuring solution. The attenuation (absorbance) of the light
beam is measured for individual wavelengths.The wavelength dependent distri­bution produces the absorbance spectrum.

The wavelength range where an absorbance occurs is characteristic of the
substance.The extent of the absorbance depends on the amount of the
substance.

The influence of typical interference matrix variants occurring at municipal waste
water treatment plants can be eliminated by including the entire absorbance
spectrum.

With this measuring principle, measuring does not take place continuously but
at intervals.

NiCaVis 705 IQ Outlet

NiCaVis 705 IQ Overview

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1.4 Structure of the sensor NiCaVis 705 IQ

The sensor has a light source (1), a measuring gap (3) to enable the contact of
light with the measuring solution, and a detector (5) to measure the attenuated
light beam.

The sender of the optical system (2) directs a light beam, the measuring beam
(6), through the measuring solution and a second light beam, the reference
beam (8), over a distance without measuring solution. The test sample is
between both measurement windows (3) in the measuring gap.

The receiver of the optical system (4) directs the measuring beam and reference
beam to the detector. In the detector, the light is received by fixed photo diodes.

Fig. 1-2 Structure of the sensor

1 Light source

2 Sender of the optical system

3 Measuring gap between the measurement windows

4 Receiver of the optical system

5 Detector

6 Measuring beam

7 Reference beam

8 Connection for the optional compressed air cleaning system

7

6

34

8

21 5

Safety NiCaVis 705 IQ

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2 Safety

2.1 Safety information

2.1.1 Safety information in the operating manual

This operating manual provides important information on the safe operation of
the product. Read this operating manual thoroughly and make yourself familiar
with the product before putting it into operation or working with it. The operating
manual must be kept in the vicinity of the sensor so you can always find the infor­mation you need.

Important safety instructions are highlighted in this operating manual. They are
indicated by the warning symbol (triangle) in the left column. The signal word
(e.g. "CAUTION") indicates the level of danger:

NOTE

indicates a situation where goods might be damaged if the actions mentioned
are not taken.

2.1.2 Safety signs on the product

Note all labels, information signs and safety symbols on the product. A warning
symbol (triangle) without text refers to safety information in this operating
manual.

2.1.3 Further documents providing safety information

The following documents provide additional information, which you should
observe for your safety when working with the measuring system:

 Operating manuals of other components of the IQ S

ENSOR NET system

(power packs, controller, accessories)

 Safety datasheets of calibration and maintenance equipment (e.g. cleaning

solutions).

WARNING

indicates a possibly dangerous situation that can lead to seri­ous (irreversible) injury or death if the safety instruction is not
followed.

CAUTION

indicates a possibly dangerous situation that can lead to slight
(reversible) injury if the safety instruction is not followed.

NiCaVis 705 IQ Safety

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2.2 Safe operation

2.2.1 Authorized use

The authorized use of the NiCaVis 705 IQ consists of its use as a sensor in the
IQ S

ENSOR NET. Only the operation and running of the sensor according to the

instructions and technical specifications given in this operating manual is autho­rized (see chapter 8 T

ECHNICAL DATA). Any other use is considered unauthor-

ized.

2.2.2 Requirements for safe operation

Note the following points for safe operation:

 The product may only be operated according to the authorized use specified

above.

 The product may only be supplied with power by the energy sources men-

tioned in this operating manual.

 The product may only be operated under the environmental conditions men-

tioned in this operating manual.

 The product may not be opened.

2.2.3 Unauthorized use

The product must not be put into operation if:

 it is visibly damaged (e.g. after being transported)

 it was stored under adverse conditions for a lengthy period of time (storing

conditions, see chapter 8 T

ECHNICAL DATA).

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3 Commissioning

3.1 IQ SENSOR NET system requirements

Software versions of

the controller and

terminal

components

The operation of the NiCaVis 705 IQ requires the following software versions in
the IQ S

ENSOR NET:

For cleaning with

compressed air via

a relay

3.2 Scope of delivery of the NiCaVis 705 IQ

The following parts are included in the scope of delivery:

 SensorNiCaVis 705 IQ

 Sensor sleeve

 Shock protectors

 Operating manual

 DIQ/S 28X Controller software: Version 3.72 or higher

 DIQ/S 182 Controller software: Version 3.45 or higher

 MIQ/MC3 Controller software: Version 3.72 or higher

 MIQ/MC2 Controller software: Version 3.72 or higher

 MIQ TC 2020 XT Controller software: Version 3.72 or higher

 DIQ/S 28X Controller software: Version 3.72 or higher

 DIQ/S 182 Software version: Version 3.45 or higher

 MIQ/CR3 Software version: Version 2.90 or higher

 MIQ/R6 Software version: Version 2.90 or higher

 MIQ/CHV PLUS Software version: Version 2.90 or higher

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3.3 Installation

3.3.1 Mounting the sensor

NOTE

The sensor is an optical precision instrument that should be protected against
shocks. Make sure that the distances to the wall, bottom and other installation
surroundings are sufficient. If necessary, protect the sensor from hitting with the
protective ring provided. Mount any fixing elements only on the stable metal
shaft.

NOTE

Always make sure the surface of the enclosure is not damaged by sharp-edged
objects. The enclosure of the sensor may not touch any metallic objects in order
to prevent contact corrosion.

NOTE

Do not suspend the sensor on the sensor connection cable. Risk of cable break
and water penetration at the cable gland.

A wide range of mounting accessories is available for the installation of the
NiCaVis 705 IQ (see chapter 6 S

PARE PARTS, MAINTENANCE EQUIPMENT, ACCES-

SORIES). Thus, all prevalent ways of mounting are possible.

Generally, observe the following general rules

when mounting the sensor at the

measuring location:

Horizontal

installation

When mounting the sensor horizontally, the measuring gap opening should be
on the side. Thus, any air bubbles can escape upward after cleaning and no sed­iment can collect in the measuring gap. The sensor should be aligned in parallel
with the flow direction.

Fig. 3-1 Horizontal installation

Measuring gap opening

Flow direction

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Vertical installation For vertical installation, mount the sensor in a position that allows interfering ele-

ments in the measuring gap to escape with the current. In the case of vertical
installation, the minimum flow rate is 0.2 m/s so the measuring gap is kept clean
optimally.

Fig. 3-2 Vertical installation

Protection against

shocks

When installing the sensor, always make sure it cannot knock against a wall or
another obstacle. Make sure the safety margins are sufficient (e. g. with sus­pended mounting).
Mount the enclosed shock protectors (see section 3.3.2). Their soft rubber com­pound absorbs hard impacts.

Fig. 3-3 Sensor with mounted shock protectors

Flow direction

Measuring gap opening

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3.3.2 Mounting the shock protectors

The shock protectors consist of two rings, a cap and four cable ties. To mount
the shock protectors, proceed as follows:

Fig. 3-4 Mounting the shock protectors

1. Plug the cap (pos. 2 in Fig. 3-4) on one of the two rings (pos.1).

2. Put the assembled unit on the sensor end and fix it with 2 cable
ties (pos. 3) as shown in Fig. 3-4.

3. Put the second ring on the cable end of the sensor and fix it
with the remaining two cable ties in the same way.

1

3

2

Sensor with mounted

shock protectors

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3.3.3 Connecting the sensor to the IQ SENSOR NET

Connection cable A sensor connection cable of the SACIQ or SACIQ SW type is required to

connect the sensor. The cable is available in different lengths. Compared to the
standard model SACIQ, the SACIQ SW sensor connection cable is optimized
regarding its corrosion resistance in seawater and brackish water and adapted
for use in conjunction with the NiCaVis 705 IQ. Information on this and other
IQ S

ENSOR NET accessories is given in the WTW catalog and on the Internet.

Are the plug

connections dry?

Before connecting the sensor and sensor connection cable, please make sure
the plug connections are dry. If moisture gets into the plug connections, first dry
the plug connections (dab them dry or blow them dry using compressed air).

NOTE

Do not suspend the sensor on the sensor connection cable but use the suitable
mounting equipment. Information on this and other IQ S

ENSORNET

accessories

is given in the WTW

catalog and on the Internet.

How to connect the SACIQ (SW) sensor connection cable to the ter­minal strip of an MIQ module is described in chapter 3 I

NSTALLATION

of the IQ S

ENSOR NET system operating manual.

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Connecting the

sensor to the sensor

connection cable

Fig. 3-5 Connect the sensor

1. Take the protective caps off the plug connections of the sensor and the
SACIQ (SW) sensor connection cable and keep them safe.

2. Plug the socket of the SACIQ (SW) sensor connection cable onto the
plug head connector of the sensor. At the same time, rotate the socket
so that the pin in the plug head connector (1) clicks into one of the two
holes in the socket.

3. Then screw the coupling ring (2) of the sensor connection cable onto
the sensor up to the stop.

SACIQ (SW)

1

2

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3.4 Initial commissioning

3.4.1 General information

Measuring location The sensor is prepared for operation in the outlet of the waste water treatment

plant and calibrated in the factory.

The sensor is immediately ready to measure.

Use calibration after

initial ommissioning

On the basis of a reference measurement ("laboratory value"), check whether
the default settings deliver sufficiently accurate measured values or whether you
want to carry out a user calibration (see section 4.3 C

ALIBRATION).

CAUTION

Never look into the measuring window or put objects into the
measuring window during operation! The emitted UV radiation
can damage the eyes!
In the case of authorized use, inadvertent eye contact with the
light beam is not possible.

How to adjust the settings is described in the following section (sec­tion 3.4.3).

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3.4.2 Sensor structure

The physical sensor is the sensor with the instrument or model designation,
NiCaVis 705 IQ. The physical sensor processes the measurement signal
(absorbance spectrum) and supplies up to 5 measurement results to the
IQ S

ENSOR NET. The measurement results are administrated like 5 sensors that

differ in hierarchy as follows:

Main sensor The sensor for nitrate measurement is the main sensor.

It registers on the system under the designation, NiCaVis 705 IQ and the series
number of the physical sensor.

Virtual sensors All other sensors for carbon measurement are virtual sensors.

You register on the system under the designation, NiCaVis 705 IQ and the
series number of the physical sensor.

Sensor overlapping

settings and

functions

Some settings and functions are sensor overlapping. Sensor overlapping set­tings are generally edited in the setting menu of the main sensor.
These are the most important sensor overlapping settings and functions:



Measuring location

 Times of the measuring cycle

(

Meas. interval, Cleaning duration Air, Adjustment phase

etc.)



Signal smoothing

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3.4.3 Settings for the main sensor

Measuring cycle A measuring cycle consists of the cleaning procedure, the adjustment time for

the measuring system and the determination of the measured value. The follow­ing graphic demonstrates the relevant settings:

Fig. 3-6 Measuring cycle of the sensor

Carrying out

settings

Using <S>, switch from the measured value display to the main menu of the
settings. Then navigate to the setting menu (setting table) of the sensor. The
procedure is described in detail in your IQ S

ENSOR NET system operating

manual.

Default values are marked in bold.

Time

Adjustment time

Measurement

Measuring

cycle

Measuring interval

Cleaning

A change of the following settings will take some time (up to a few
minutes) until it can be seen in the measured value display:



Measuring mode



Measuring location



Number of N-sensors



Number of C-sensors

Further changes can only be made when the last changes are visi­ble in the measured value display.

Menu item Settings Explanations

Measuring mode



NO3-N



NO3

The measured parameter is displayed
in the selected citation form.
When changing the

Measuring mode

setting, always check the

Measuring

location

setting.

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Measuring location Outlet

(permanently set)

Measurement location or application of
the sensor.
 The possible measurement loca-

tions are displayed depending on the
currently set measuring mode.

 The sample matrix on which the cal-

culation of the measured value is
based changes with the location of
the sensor.

Measuring range

- Display of the measuring range
(see chapter 8 T

ECHNICAL DATA).

Cal - # raw value 1

Value pairs of the user calibration (see section 4.3.2).
Note

: Leave those values unchanged during the initial commission-

ing.

Cal - ref. value 1

Cal - # raw value 2

Cal - ref. value 2

Number of C-sensors

1 ... 4 Apart from the main sensor, up to 4

more sensors can be displayed.
The settings for the additional sensors
are done in the menus for the respec­tive sensors.

Zero adjustment Factory

User

Setting of which zero adjustment is
used in the sensor.

 Factory zero adjustment or

 Zero adjustment carried out last

Signal smoothing



On



Off

Switching on/off the signal smoothing.
For details, see

Response time t90

.

Menu item Settings Explanations

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Response time t90

3 ... 60 min Response time of the signal smoothing.

Depending on the sample matrix, mea­sured values can vary more or less
strongly (e.g. due to foreign bodies or
air bubbles).
The signal filter (here, the

Response

time t90

) reduces the limits of variation

of the measured values.
The

Response time t90

specifies the
time after which 90 % of a signal
change are displayed.
This menu item is only available with:

Signal smoothing

=

On

The specified time is used as a guide
value for low (10 min) to high (60 min)
signal smoothing and can deviate from
the value that was set.

Cleaning mode



On



Off

Switching on/off the automatic, time­controlled cleaning function.

Cleaning type



Ultrasound



Air



Ultrasound+air

Cleaning methods / adjustment time
This menu item is only available with:

Cleaning mode

=

On

The duration of the cleaning procedure
with a ir is set in the m e nu item

Cleaning

duration Air

.

Cleaning duration Air

0,5 ...10 ... 300 s This menu item is only available with:

Cleaning type

=

Air

and

Cleaning type

=

Ultrasound+air

For this setting to come into effect, the
setting

Settings of outputs and links

/

Relay function

/

Sensor controlled

/

Puls duration /Automatic

has to be
selected for the linked relay.
Please note the software requirements
for the components with relay outputs,
MIQ/CR3, MIQ/R6, MIQ/CHVPlus,
DIQ/S 182, DIQ/S 28X (see section

3.1).

Save and quit

- The system confirms the saving of the
settings and the display switches to the
next higher level.

Menu item Settings Explanations

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3.4.4 Settings for virtual sensors

Carrying out

settings

Using <S>, switch from the measured value display to the main menu of the
settings. Then navigate to the setting menu (setting table) of the sensor. The
procedure is described in detail in your IQ S

ENSOR NET system operating

manual.

Default values are marked in bold.

Quit

- The display switches to the next higher
level without storing the new settings.

Menu item Settings Explanations

Menu item Settings Explanations

Measuring mode

(NitraVis 705 IQ)



NO3-N



NO3

The measured parameter is displayed
in the selected citation form.

Measuring mode

(CarboVis 705 IQ)



COD spectr., total



COD spectr., dissolv



TOC spectr., correl.



BOD spectr., correl.



DOC spectr., correl.



SAC 254, total



SAC 254, dissolved



UVT 254, total

*



UVT 254, dissolved

*

The measured parameter is displayed
in the selected citation form.

Measuring location Outlet

(permanently set)

Measurement location or application of
the sensor.

The setting is done in the setting menu
of the relevant main sensor.

Measuring range

- Display of the measuring range
(see chapter 8 T

ECHNICAL DATA).

Cal - # raw value 1

Value pairs of the user calibration (see section 4.3.2).
Note:

Leave those values unchanged during the initial commission-

ing.

Cal - ref. value 1

Cal - # raw value 2

Cal - ref. value 2

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Main sensor

Information that there are further sen­sor overlapping settings in the setting
menu of the relevant main sensor
(

Meas. interval, Cleaning duration Air

,

Signal smoothing

etc.).

Save and quit

- The system confirms the saving of the
settings and the display switches to the
next higher level.

Quit

- The display switches to the next higher
level without storing the new settings.

* The UVT-254 value is standardized to 10 mm gap width.

Menu item Settings Explanations

NiCaVis 705 IQ Measurement / Operation

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4 Measurement / Operation

4.1 Determination of measured values

Fig. 4-1 Determination of measured values

During a measurement, the absorbance spectrum of the test sample is recorded
and set against the stored absorbance spectrum of a zero adjustment (measure­ment in ultrapure water). The algorithm for the calculation depends on the
selected application and/or the measuring location. The resulting raw value can
be adjusted to an independent reference measurement with the aid of a so­called user calibration.

Absorbance spectrum

of zero adjustment

Absorbance spectrum

of measurement

Physical sensor, series number xxx

Main
sensor
software

Virtual

sensor

software

Main sensor meas. mode

(algorithm)

User calibration data

of main sensor

Main sensor raw value

Meas. value of main sensor

Virtual sensor raw value

Meas. value of virtual sensor

Virtual sensor meas. mode

(algorithm)

User calibration data

of virtual sensor

IQ Sensor Net

Measurement / Operation NiCaVis 705 IQ

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4.2 Measurement operation

Measured value

display

Fig. 4-2

Factors affecting the

measured values

The following factors can adversely affect the measurement quality:

 The measuring gap is not sufficiently filled and flowed through by the test

sample

 Foreign bodies and air bubbles are in the measuring gap

 Extraordinary changes (interferences) of the sample matrix

 Contaminated measurement windows due to difficult sample matrix

 Damaged measuring windows

 Lacking quality of the zero adjustment, e. g. due to contaminated ultrapure

water

 The user calibration is not representative (or erroneous)

4.3 Calibration

4.3.1 Overview

In the delivery condition, the sensor is precalibrated and ready to measure (see
section 3.4.1).

There are two types of calibration that are included into the calculation of the

CAUTION

Never look into the measuring window or put objects into the
measuring window during operation! The emitted UV radiation
can damage the eyes!
In the case of authorized use, inadvertent eye contact with the
light beam is not possible.

Raw value,
identifiable by #

Measured value

NiCaVis 705 IQ Measurement / Operation

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measured value at different points (see section 4.1):

 User calibration (see section 4.3.2)

 Sensor check/

Zero adjustment

(see section 4.3.3).

An overview diagram of the calibration procedures can be found on page 4 - 32.

User calibration With a user calibration you compensate for the influence of the test sample. The

user calibration requires a successful

Sensor check (H2O dest.)

and a valid

Zero adjustment

.

We recommend to check the current user calibration against independent
comparison measurements if you suspect a basic change of the characteristics
of the test sample. If the comparison measurements show clear deviations,
these can be compensated by a user calibration.

Recalibration after a

change of the

measuring location

Sensor check (H2O

dest.)

The characteristics of a sensor and thus the measured values provided by it
change in the course of time.

The reasons for this can be the aging of the sensor, or contamination or
mechanical damage of the sensor. Contamination or mechanical damage in the
area of the measuring chamber or on the measurement windows affect the
measured values.

A

Sensor check (H2O dest.)

determines the condition of the sensor. By checking

the sensor with the aid of the

Sensor check (H2O dest.)

you can rapidly see any
changes of the sensor and whether it needs to be cleaned or if any other actions
have to be taken.

A

Sensor check (H2O dest.)

should be carried out twice per year at regular inter-

vals. An extraordinary

Sensor check (H2O dest.)

should be carried out if you
suspect that the sensor has been damaged such as by mechanical shock, or if
the measured values do not seem plausible.

Each time after the application or measurement location was
changed, we recommend to carry out a

Zero adjustment

(and, if the

Sensor check (H2O dest.)

was not successful, also a

Zero adjust

-

ment

with user calibration if necessary) (With a change of the

Measuring location

setting).

The data of the user calibration are stored in the IQ S

ENSOR NET

controller and thus assigned to the measuring location (not to the
sensor). The calibration data of the

Zero adjustment

are stored in

the sensor.

In spectroscopy, even very small contamination that is not visible to
the eye can considerably affect the measured value.
The proper and thorough cleaning of the sensor is the basis for reli­able measurement data.

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Zero adjustment

While the

Sensor check (H2O dest.)

just determines the current state of the

sensor, a

Zero adjustment

can be used to compensate for changes of the

sensor. A zero adjustment can be required if, for example, the

Sensor check

(H2O dest.)

is not successful even after the sensor was thoroughly cleaned.

If the

Zero adjustment

is not successful, the sensor is blocked for measurement.

A successful

Zero adjustment

is required for the determination of measured val-

ues.

Sensor check

(standard)

Use the

Sensor check (standard)

to check the sensor with a standard solution

(see chapter 6 S

PARE PARTS, MAINTENANCE EQUIPMENT, ACCESSORIES). During

the check, the recorded spectrum is compared to a reference spectrum of the
standard solution stored in the sensor.

The sensor should always be very thoroughly cleaned prior to a zero
adjustment.

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4.3.2 User calibration

Calibration points

and value pairs

The adjustment is carried out at one or two points within the measuring range.
A value pair is determined at each point. Each value pair consists of the raw
value of the NiCaVis 705 IQ sensor and the corresponding reference value.

Each value pair has to be determined at the same time and place as the test
sample as possible. At the time of the calibration, the test sample should be in
a condition that is typical of the application.

Selection of

calibration points

If the required accuracy is low, the default setting of the first value pair can be
adopted unchanged. The first value pair is equivalent to the zero point in this
case. The second value pair should be close to the working point of the applica­tion. This method results in a single-point calibration.

If the application has to cover a wide value range with high measuring accuracy,
both value pairs should be used for calibration. When doing so, the calibration
value pairs should be determined and input at the limits of the application range
as possible.

You obtain samples of different concentrations e. g. by taking two samples
during clearly different conditions of the plant (dry period and rain period).

Storage location of

user calibration data

The calibration data of the user calibration are stored in the IQ S

ENSOR NET

controller. They are loaded into the sensor during operation and automatically
assigned to the replacement sensor if the sensor is exchanged.

The measurement results will be ever more accurate the closer the
composition of the test sample corresponds to the status at the time
of the calibration. If there is a fundamental change of the character­istics of the sample, a new calibration may be necessary.

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Performing a user

calibration

Proceed as follows if you want to perform a user calibration:

1. Bring the sensor into the measuring position.

2. Switch to the measured value display with <M>.

3. Use <> to select the NiCaVis 705 IQ sensor.

4. Call up calibration with <C>. The

Maintenance condition:

Linked outputs are frozen.

window appears.

By activating the maintenance condition, linked outputs remain in
their present state. The cleaning and the determination of measured
values are switched off. The measured value display shows a flash­ing, invalid measured value ("----").

5. Confirm the maintenance condition with <OK>.

6. Select the menu item,

Single measurement

.

The measurement is started. After measuring, read the raw value (with­out dimension) and note it down. In the case of fluctuating values, carry
out several measurements and average the individual raw values.

7. Take a sample at the same time as the measurement and as close to
the sensor as possible.

8. Determine the reference value and note it down as a value pair together
with the raw value.

9. For a two-point calibration:
Determine the second value pair (step 6 to step 8).

At least one value pair and a maximum of two value pairs can be
entered for a valid calibration. The values must be in ascending
order. If they are not in ascending order, a calibration error will occur.

10. NiCaVis 705 IQ Switch off the maintenance condition (use <>

to select the sensor, press <OK> and make the setting in the

Anzeige/

Optionen

menu).

11. Switch to the measured value display with <M>. The measured value
stops flashing.

12. Sort the values pairs in ascending order.

13. In the

Settings of sensors and diff. sensors

menu, enter the value pair

or pairs (see the following table).

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Default values are marked in bold.

Calibration

evaluation

The entered calibration data are checked for plausibility by the system. The
check can have the following results:

The entry of calibration values outside the measuring range leads
to a calibration error.

Menu item Settings Explanations

Cal - # raw value 1

CarboVis:

-10000,00 ... 0,00 ... 20000,00

NitraVis

:

-10000,00 ... 0,00 ... 5000,00

Raw value of the first value pair
(lower concentration).
For single-point calibration, enter 0.

Cal - ref. value 1

CarboVis:
0,00 ... 20000,00

NitraVis

:

0,00 ... 5000,00

Reference value of the first value pair
(lower concentration).
For single-point calibration, enter 0.

Cal - # raw value 2

CarboVis:

-10000,00 ... 0,00 ... 20000,00

NitraVis

:

-10000,00 ... 0,00 ... 5000,00

Raw value of the second value pair
(higher concentration) or raw value of the
single-point calibration.

Cal - ref. value 2

CarboVis:
0,00 ... 20000,00

NitraVis

:

0,00 ... 5000,00

Reference value of the second value pair
(higher concentration) or reference value
of the single-point calibration.

Display Meaning/actions

Measured
value display

Successful new valid calibration value pairs were entered for
the sensor.

"----" Calibration value pairs not accepted. Sensor is blocked for

measurement. A log book message is generated.
Causes:

 Ascending order not observed.

 At least one value is outside the measuring range.

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Information on the contents and structure of the log book and how
you can call it up is given in the L

OG BOOK chapter of the

IQ S

ENSOR NET system operating manual.

The user calibration is not recorded in the calibration history. You
can, however, view the current value pairs in the

Settings of sen

-

sors and diff. sensors

menu at any time.

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4.3.3 Sensor check/

Zero adjustment

NOTE

The sensor check or Zero adjustment must be carried out under absolutely
clean conditions. If you do not work carefully enough the Zero adjustment can
deteriorate the measuring quality.

Ultrapure water

(H2O dist.)

As ultrapure water exclusively use distilled or deionized water that is suitable for
analysis purposes.

Storage location of

the

Zero adjustment

data

The data of the sensor checks are not stored.
The data of the user zero adjustment are stored in the sensor.

Outlet A successful

Sensor check (H2O dest.)

is the prerequisite for a valid user cali-

bration. After each

Sensor check (H2O dest.)

the sensor is evaluated.

A changed sensor evaluation proves that the cleaning was effective.

The steps of the sensor check or

Zero adjustment

are identical except for the
used check solutions (ultrapure water or standard solution) and are described
together below. The sensor check and

Zero adjustment

are carried out with the

aid of the sensor sleeve.

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Flowchart

Fig. 4-3

Overview of

Sensortest/Zero adjustment and user calibration.

After cleaning several times
without significant change of
the sensor assesssment:
Carry out zero adjustment

Main sensor:

Check user calibration

Virtual sensor:

Check user calibration

Sensor OK

Operating error or defective sensor

(Sensor blocked for measurement)

Sensor check

(Standard)

OK Error

-40 ... +40 < -40 or
> +40

Operating error or defective sensor

Zero adjustment

Error

OK

After several zero adjustments:
Reset to:

Factory zero adjustment or
last valid user zero adjustment

After several sensor checks:

Cleaning the sensor

Sensor check

(H2O dist.)

Assessment number

Rinse the measuring chamber
with ultrapure water several times

Clean the measurement windows

Carry out a sensor check (H2O)

TEST: MEASUREMENT WINDOWS

TEST: ELECTRONICS AND OPTICS

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Preparing the

sensor check or

Zero adjustment

Prepare the sensor check or

Zero adjustment

as follows:

1. Switch to the measured value display with <M>.

2. Use <> to select the NiCaVis 705 IQ sensor.

3. Call up calibration with <C>. The

Maintenance condition:

Linked outputs are frozen.

window appears.

By activating the maintenance condition, linked outputs remain in
their present state. The cleaning and the determination of measured
values are switched off. The measured value display shows a flash­ing, invalid measured value ("----").

4. Confirm the maintenance condition with <OK>.

5. Take the sensor out of the test sample.

6. Remove the blind plug or unscrew the compressed air connection from
the sensor.

7. Thoroughly clean the sensor enclosure, sensor sleeve and the com­pressed air channels (see section 5.1 M

AINTENANCE).

To finish the cleaning procedure, thoroughly rinse the entire sensor with
ultrapure water.

8. Mount the cleaned sensor sleeve:

 Loosen both coupling rings on the sensor sleeve.

 Put the sensor sleeve on the sensor and align it:

– The measuring gap is in the center of the sensor sleeve

– The filling opening of the sensor sleeve and the measuring gap

opening of the sensor are offset by 90°.

 Tighten both coupling rings on the sensor sleeve by hand.

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Fig. 4-4 Putting the sensor sleeve on the sensor

Carrying out the

sensor check or

Zero adjustment

9. Put the sensor in a horizontal position on a firm and vibration-free sur­face. Turn the filling opening of the sensor sleeve upward (Fig. 4-4).

10. Rinse the measuring chamber with ultrapure water at least 3 times.

11.  For

Sensor check (H2O dest.)

or

Zero adjustment

:

Fill the measuring chamber with ultrapure water.

or
 For

Sensor check (standard)

:

Fill the measuring chamber with standard solution (see section 6).

12. If there are any air bubbles on the measuring windows remove them by
gently knocking on the sensor sleeve with a bar.

Carry out the intended sensor check or

Zero adjustment

directly
after filling the sensor sleeve. If you wait longer, the result of the
Sensor check/

Zero adjustment

will be affected.

Measuring
chamber

Sensor
sleeve

13. Select the required option with <> and <OK>:



Sensor check (H2O dest.)



Zero adjustment



Sensor check (standard)

14. Confirm with <OK>.
A multipart checklist appears. Use it to check once more whether all
preparations have been completed.

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Result

after

Sensor

check (H2O dest.)

If the rating number is not in the zero range:
Repeat the cleaning procedure and the

Sensor check (H2O dest.)

until the rating
number no longer changes significantly.
If the rating number is still outside the zero range, a new zero adjustment is nec­essary.

Result

after

Zero

adjustment

If the result is erroneous, clean the sensor and all equipment once again. Then
carry out a new

Zero adjustment

and when doing so make sure the conditions

are absolutely clean.

15. Confirm each checklist with <OK> until the

Start measurement

display

appears.

Up to this point, you can break off the calibration procedure at any
time with the <ESC> key. The system continues to work with the old
calibration data. The maintenance condition, however, has to be
switched off again in any case.
After starting the calibration with the <OK> key (step 16.) you can no
longer cancel the calibration procedure.

16. Confirm with <OK>.
The measurement is started. After the end of the measurement the
result appears. With the

Zero adjustment

, the result is entered in the

calibration history at the same time.

Rating number Meaning

Zero range
(-40 ... +40)

Sensor check (H2O dest.)

successful (OK)

(0 = no deviation)

Positive number
(+40 ... +1000)

Measured values were too low.
Possible cause:
The measurement windows are contaminated.

Negative num­ber
(-40 ...-1000)

Measured values were too high.
Possible cause:
During the last zero adjustment, the measurement
windows were contaminated more than during the
current sensor check.

Result

Meaning Sensor released for

measurement

OK Zero adjustment

successful. yes

Error Zero adjustment

not success-

ful.

No ("----")

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Result

after

Sensor

check (standard)

Completing the

sensor check or

Zero adjustment

After a successful sensor check or

Zero adjustment

, return to measurement as

follows:

If no valid zero adjustment is possible under the current conditions,
you can restore the readiness for measurement by measuring with
an older valid zero adjustment.
To do so, select the

Zero adjustment

setting in the sensor settings

Factory

(factory zero adjustment) or

User

(last valid user zero
adjustment).
Then check the measurement results with a

Sensor check (stan

-

dard)

. Suitable standards (check equipment) for your sensor are

available as accessories (see chapter 6).

Result

Meaning

OK Sensor check (standard)

successful.

Error Sensor check (standard)

not successful.

Possible cause

: wrong or expired standard

17. Confirm the calibration result with <OK>.

18. Confirm the message,

"After successful cal ..."

with <OK>.
The display returns to the measured value display. The measured val ue
flashes because the sensor is still in the maintenance condition.

19. Pour away the ultrapure water or standard solution and remove the
sensor sleeve.

20. Screw in the blind plug or compressed air connector and install the sen­sor at the measuring site.

21. After the

Sensor check (standard)

:

Thoroughly rinse the sensor and sensor sleeve with ultrapure water.

22. NiCaVis 705 IQ Switch off the maintenance condition (use <>
to select the sensor, press <OK> and make the setting in the

Display/

Options

menu).

23. Switch to the measured value display with <M>. The measured value
stops flashing.

Store the sensor sleeve in a clean environment, e. g. in a plastic
bag, until the next sensor check or

Zero adjustment

.

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5 Maintenance and cleaning

5.1 Maintenance

The UV-VIS- NiCaVis 705 IQ sensor operates maintenance-free.

5.2 Sensor cleaning

5.2.1 Cleaning agents and accessories

Cleaning agents To clean the sensor, use the following cleaning agents only:

* For the final cleaning prior to a

Sensor check

or

Zero adjustment

, only use
cleaning agents with purity grade "for analysis". Finally, thoroughly rinse the
sensor with ultrapure water.

Accessories  Sponge

 Plastic-bristled brushes of different sizes.

Interdental brushes are suitable for the cleaning of the compressed air chan­nels.

 Flocked cleaning cards (see accessories)

 Lens tissues

 Wash bottle

NOTE

Never use any pressure washer, steam blaster, abrasives or metal brushes to
clean the sensor. Risk of damaging the sensor.

Contamination Cleaning agents

Water-soluble substances – Primary cleaning: Tapwater, warm if

possible
(30 - 50 °C)

– Precision cleaning: Household wash-

ing-up liquid + ultrapure water.

Lime deposits 5 % hydrochloric acid *

Grease deposits Mixture of isopropanol and water (approx.

70 % isopropanol) *

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5.2.2 General steps to be taken

Depending on the application site and the level of contamination of the sensor
as well as the coming job, the cleaning procedure includes the following parts:

 Every cleaning procedure starts with a basic cleaning. It removes tough

grime such as incrustation of fouling matter, algae and biological deposits. If
the sensor surface might be contaminated with pathogenic germs it should
also be disinfected.

 Cleaning the measuring gap: Removal of lime deposits.

 Cleaning the measuring gap: Removal of grease deposits.

Example 1 A heavily contaminated sensor, for which a

Sensor check

or

Zero adjustment

should be carried out, must run through all cleaning steps properly. During the
cleaning process always keep all surfaces moist to prevent already dissolved
contamination and detergents from drying ("working wet-on-wet"). Finally, thor­oughly rinse off all remaining cleaning agents with ultrapure water.

Example 2 If the sensor from example 1 should be cleaned on site during a routine visual

inspection and should then continue measuring, a basic cleaning might possibly
be sufficient.

The quoted examples and the following descriptions are intended to
give a general guideline. Due to the sensor's wide range of applica­tion, the type and level of contamination can considerably vary.
Therefore, the cleaning procedure has to be individually composed.
If necessary, individual cleaning steps have to be changed or
repeated several times until the result meets the requirements.

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5.2.3 Basic cleaning

Steps of the basic

cleaning

After completing the cleaning procedure, screw in the blind plug or compressed
air connection.

1. Take the sensor out of the test sample and remove any solid matter
deposits and incrustation of fouling matter manually with a brush or
sponge.

2. Wash the sensor down with warm tapwater (30 - 50 °C).
Note:

Do not use a pressure washer or steam blaster.

3. If the sensor might be contaminated with pathogenic germs it should be
disinfected with a surface disinfectant. This also applies to the cable and
mounting parts.
Note:

Follow the instruction manual of the disinfectant (reaction time!).

4. Remove the blind plug or unscrew the compressed air connection from
the sensor.

5. Clean the sensor with soapy water. When doing so, clean the area of
the measuring gap and the compressed air channels very thoroughly.
The compressed air channels can be cleaned with the aid of interdental
brushes and rinsed with soapy water from a wash bottle.

6. Soak the flocked cleaning cards with soapy water and use them to clean
the measuring gap as shown in the following figure. Cut suitable strips
off the cleaning card to clean the bottom of the measuring gap.
Then rinse the sensor with running warm tapwater and finally with a lot
of ultrapure water.

7. Finally wipe the measurement window with a lens tissue.

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5.2.4 Cleaning the measuring gap

To remove lime or grease deposits, use the flocked cleaning cards together with
the following detergents:

Proceeding  Start by removing any lime deposits.

 Soak a flocked cleaning card with the relevant detergent and use it to clean

the measuring windows according to step 6. in section 5.2.3 B

ASIC CLEANING.

If necessary, leave the cleaning card in the measuring gap for a few minutes
so the detergent can take effect.

 Thoroughly rinse with ultrapure water the measuring gap and the surrounding

areas moistened with detergent.

 Then wipe the measurement window with a lens tissue. The surface of the

measurement windows must be free of streaks.

 Protect the cleaned sensor against new contamination.

Contamination Cleaning agents

Lime deposits Hydrochloric acid 5 % for analysis

Grease deposits Mixture of isopropanol and water (approx. 70 % iso-

propanol), made of 7 volume parts isopropanol for
analysis and 3 volume parts ultrapure water

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6 Spare parts, maintenance equipment,

accessories

General

accessories,

replacement parts

Test equipment

Components for the

optional

compressed air

cleaning system

Description Model Order no.

Calibration sleeve VIS/CV 481 074

20 flocked cleaning cards for cleaning the
measuring gap

VIS/CT 481 071

Cleaning set:

– 20 flocked cleaning cards

– Cleaning solutions

VIS C/SET 481 079

Description Model Order no.

Standard 1
with low concentration
for 5 mm UVVIS/SAC/NOx sensors

ST-1 481 077

Standard 2
with high concentration
for 1 mm UVVIS/SAC/NOx sensors

ST-2 481 078

Description Model Order no.

Compressed air cleaning set with 15 m
compressed-air hose, to be connected to a
valve module or Cleaning Air Box

SET/AP 481 075

Active valve module (does not require a
free relay output in the IQ S

ENSOR NET

system)

MIQ/CHV PLUS 480 018

Valve module for the IQ S

ENSOR NET sys-

tem 182 (external relay and compressed
air supply)

DIQ/CHV 472 007

Air compressor to be triggered by relay,
power supply 115 V AC

Cleaning Air Box

- 115 VAC

480 017

Air compressor to be triggered by relay,
power supply 230 V AC

Cleaning Air Box

- 230 VAC

480 019

Spare parts, maintenance equipment, accessories NiCaVis 705 IQ

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Mounting

accessories

Description Model Order no.

Mounting set for horizontal installation with
EH/F 170 swing mounting assembly

VIS Set/EH 481 073

Set for the mounting of UVVIS/SAC/NOx
sensors to the S 200 electrode floater

VIS Set/F 481 080

Flow-through armature VIS FT-1 480 080

Information on other IQ SENSOR NET accessories is given in the
WTW catalog and on the Internet.

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7 What to do if...

"----" display

(invalid measured

value)

Implausible

measured values

Cause Remedy

– User calibration values entered

incorrectly

– *

Sensor check (H2O dest.)

or

*

Zero adjustment

or

*

Sensor check (standard)

defective

– Correct the entry and enter once

again (section 4.3.2)

– Repeat

*

Sensor check (H2O dest.)

or

*

Zero adjustment

or

*

Sensor check (standard)

.
Check conditions, especially clean­liness (section 4.3.3)

–

Zero adjustment

still erroneous

after several trials

–Contact service

– Unknown – See log book

Cause Remedy

– Erroneous user calibration – Repeat user calibration. Make sure

the samples for comparison are rep­resentative.

– Substantial change of test sample

(sample matrix)

– Carry out new user calibration

– Measurement windows dirty – Clean the measurement windows

– Sensor setting wrong – Check and, if necessary, correct the

Measuring mode, Measuring loca

-

tion

sensor settings

– Carry out new user calibration

– Optical system maladjusted, e. g.

due to inadmissible mechanical
shock

– Carry out

*

Sensor check (H2O dest.)

or

*

Zero adjustment

or

*

Sensor check (standard)

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Drifting measured

values

Display of

OFL

Measured values

fluctuating heavily

Measured values

too low or too high

Cause Remedy

– Cleaning efficiency too low - mea-

surement windows becoming
more and more contaminated

– Clean the measurement windows

(section 5.2.4)

– Use other cleaning method

– Select different measurement loca-

tion

– Set longer cleaning duration

– Set more frequent cleaning proce-

dures

– Install optional compressed air

cleaning device

– Failure of the optional com-

pressed air cleaning system

– Clean the measurement windows

(section 5.2.4)

– Check all components of the com-

pressed air cleaning system (com­pressor, compressed air line,
sensor, rinsing openings)

– Substantial change of test sample

(sample matrix)

– Carry out new user calibration

Cause Remedy

– Measuring range exceeded – Check process

– Foreign matter in the measuring

gap

– Clean the measuring gap (section

5.2.3)

– Erroneous user calibration – Repeat user calibration. Make sure

the samples for comparison are rep­resentative.

Cause Remedy

– Gas bubbles in front of the mea-

surement windows

– Check the position within the pro-

cess and the installation position

Cause Remedy

– Gas bubbles in front of the mea-

surement windows

– Check the installation position of the

sensor

NiCaVis 705 IQ What to do if...

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Display of

ERROR

– Measurement windows dirty – Clean the measurement windows

Cause Remedy

Cause Remedy

– Sensor not correctly connected – Check the assignment of the termi-

nal connections

– Load at a power supply module

too high

– Install another power supply module

in the vicinity of the sensor

–IQS

ENSOR NET cable towards the

NiCaVis 705 IQ too long (voltage
drop too great)

– Install another power supply module

in the vicinity of the sensor

– Electrical connection between

power supply module and
NiCaVis 705 IQ is interrupted

– Check the cable connection step-

by-step starting with the power sup­ply module, and replace any defec­tive cable sections.

– Check the contacts on the MIQ

modules (stack mounting). Clean
any dirty contacts. Carefully bend
back contact springs that have been
pressed flat or bent (pay attention to
sufficient spring tension)

Technical data NiCaVis 705 IQ

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8 Technical data

8.1 Measurement characteristics

Measuring principle Spectrophotometric Absorption measurement; integrated microprocessor elec-

tronics, shielded 2-wire connection for power and data transmission.

Light source

Detector

Wavelengths range 200 - 720 nm

Measuring gap

(optical layer

thickness)

Nitrate

measurement,

5 mm gap width

Carbon

measurement,

5 mm gap width

Lamp type Xenon flashlamp

Photo diodes 256

NiCaVis 705 IQ 5 mm

Measuring location Measuring mode Measuring range Resolution

NO3

0.0 ... 250.0 mg/L 0.1 mg/L

NO3-N

0.00 ... 50.00 mg/L 0.01 mg/L

Measuring location Measuring mode Measuring range Resolution

Outlet COD spectr., total

0.0 ... 800.0 mg/L 0.1 mg/L

COD spectr., dissolv

0.0 ... 800.0 mg/L 0.1 mg/L

TOC spectr., correl.

0.0 ... 500.0 mg/L 0.1 mg/L

DOC spectr., correl.

0.0 ... 500.0 mg/L 0.1 mg/L

BOD spectr., correl.

0.0 ... 500.0 mg/L 0.1 mg/L

SAC 254, total

0.0 ... 600.0 1/m 0.1 1/m

SAC 254, dissolved

0.0 ... 600.0 1/m 0.1 1/m

UVT 254, total

*

* The UVT-254 value is standardized to 10 mm gap width.

0.0 ... 100.0 % 0.1 %

UVT 254, dissolved

* 0.0 ... 100.0 % 0.1 %

NiCaVis 705 IQ Technical data

47

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8.2 Application characteristics

Suitability and areas

of application

Measuring medium

Pressure resistance Sensor with connected SACIQ (SW) sensor connection cable:

The sensor meets all requirements according to article 3(3) of 97/23/EC ("pres­sure equipment directive").

Type of protection Sensor with connected SACIQ (SW) sensor connection cable:

IP X8, 1 bar (10

5

Pa)

Immersion depth

Operating position Any

The quoted measuring ranges are nominal measuring ranges that
are theoretically possible. In practice, real measuring ranges exist
that are given by the limits of photometric determination. The limits
are significantly influenced by the light scattering due to solids and
the absorption of accompanying substances (sample matrix).
Therefore, no fixed measuring range can be determined before­hand.

Municipal wastewater with a low proportion of industrial wastewater

pH value 4 - 12

Flow rate < 3 m/s

Temperature 0 °C ... + 45 °C

(32 °F ... + 113 °F)

Max. admissible overpressure 105 Pa (1 bar)

min The measuring gap must be

filled with test sample.

max 10 m depth

Technical data NiCaVis 705 IQ

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8.3 General data

Dimensions

(in mm)

Weight

Connection

technique

Connection via SACIQ (SW) sensor connection cable

Materials

Storage

temperature

Ø 96

891

Ø 60

Ø 96

891

120

Socket SACIQ...

With shock protection:

774

865

381

Approx. 3.8 kg (without shock protectors and without sensor connec­tion cable)
Approx. 4.8 kg (with shock protectors but without sensor connection
cable)

Sensor shaft Titan Grade 2

Center piece PEEK

End cap PEEK

Measurement window Sapphire

Plug head connector housing POM

Plug, 3-pole ETFE (blue) Tefzel

®

Protection ring POM

- 10 °C ... + 50 °C (14 ... 122 °F)

NiCaVis 705 IQ Technical data

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Meter safety

Test certificates

8.4 Electrical data

Applicable norms – EN 61010-1

– UL 61010-1

– CAN/CSA C22.2#61010-1

– IEC 62471

cETLus, CE

2001759

Conforms to ANSI/UL 61010-1
Certified to CAN/CSA C22.2#61010-1"

Nominal voltage Max. 24VDC

via the IQ S

ENSOR NET (for more details,

see chapter T

ECHNICAL DATA of the

IQ S

ENSOR NET system operating manual)

Power consumption

8W

(maximum power consumption)

3.5 W
(medium power consumption)
If the system is supplied with power via a
MIQ/WL PS o DIQ/S 28X, only the
medium power consumption has to be
taken into account.

Protective class III

Indexes NiCaVis 705 IQ

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9 Indexes

9.1 Explanation of the messages

This chapter contains a list of all the message codes and related message texts
that can occur in the log book of the IQ S

ENSOR NET system for the

NiCaVis 705 IQ sensor.

Some error messages contain an internal error code, starting with "#".

Information on the contents and structure of the log book and the
structure of the message code is given in the L

OG BOOK chapter of

the IQ S

ENSOR NET system operating manual.

The last three digits of the message code form the component code.
It identifies the component (active component) that caused the mes­sage:

Module code Component

3A2 NitraVis 705 IQ

3AW CarboVis 705 IQ - virtual

3AX CarboVis 705 IQ - virtual

3AY CarboVis 705 IQ - virtual

3AZ CarboVis 705 IQ - virtual

541 BasicVis IQ

NiCaVis 705 IQ Indexes

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9.1.1 Error messages

Message code Message text

EA2541

Sensor temperature too high!
* Check process and application

EA3541

Sensor temperature too low!
* Check process and application

EAF541

Optical measuring range exceeded
* Check process (TSS or measured value too high)
* Select measuring location free of air bubbles
* Remove foreign matter from measuring gap
* Clean sensor
* Optimize cleaning settings
* Switch on signal smoothing, increase response time

EAI541

Zero adjustment erroneous
* Clean the sensor and sensor sleeve repeatedly
* Position the sensor sleeve according to operating manual
* Rinse the measuring chamber with ultrapure water several times
* Fill the measuring chamber with ultrapure water
* Repeat the zero adjustment

EAM3Ax

Meas. range exceeded or undercut
* Check process

EC33Ax

User calibration erroneous,
Check raw value / reference value pairs:
* Set all values within the measuring range
(see operating manual)
* Enter value pairs in ascending order

EI1541

Operational voltage too low
* Check installation and cable lengths, Follow installation instructions
* Power supply module(s) overloaded, add power supply module(s)
* Check terminal and module connections
* Defective components, replace components

EI2541

Operational voltage too low, no operation possible
* Check installation and cable lengths, Follow installation instructions
* Power supply module(s) overloaded, add power supply module(s)
* Check terminal and module connections
* Defective components,
replace components

ES2541

Humidity to high in sensor
* Contact service

ES3541

Failure optical measurement: deviation in reference channel too high
* Execute zero ajustment

Indexes NiCaVis 705 IQ

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ES4541

Overflow optical measurement
* Execute zero ajustment

ES5541

Failure optical measurement: hardware
* Contact service

ES6541

Failure optical measurement: software
* Contact service

ES7541

Failure optical measurement: software BIOS
* Contact service

Message code Message text

NiCaVis 705 IQ Indexes

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9.1.2 Informative messages

Message code Message text

IA23Ax

Calculation of negative concentrations
* Perform user calibration or check user calibration

IAC541

Zero adjustment was successfully carried out
* Carry out sensor check
* If required, carry out new user calibration

IC3541

Factory calibration has been activated. Make sure the sensor operates
correctly.

IC4541

The last valid user zero adjustment was activated. Make sure the sen

-

sor operates correctly.

IC5541

Invalid user zero adjustment was replaced by last valid user calibration.
Caution! Wrong measured values possible. Carry out a new successful
zero adjustment to make sure the sensor operates correctly.

IC6541

The invalid user zero adjustment was replaced by the factory zero
adjustment. Caution! Wrong measured values possible. Check
whether the sensor operates correctly or carry out a new successful
user zero adjustment.

Indexes NiCaVis 705 IQ

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9.2 Status info

The status info is a coded piece of information on the current status of a sensor.
Each sensor sends this status info to the controller. The status info of sensors
consists of 32 bits, each of which can have the value 0 or 1.

Status info,

general structure

The bits 0 - 15 are reserved for general information.
The bits 16 - 21 are reserved for internal service information.

You obtain the status info:

 via a manual query in the

Einstellungen/Settings/Service/List of all compo

-

nents

menu (see system operating manual)

 by an automated query

– from a superordinate process control (e. g. when connected to the Profi-

bus)

– of the IQ Data Server (see operating manual of the IQ S

ENSOR NET soft-

ware pack)

Status-Info

NiCaVis 705 IQ

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 (general)

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 (internal)

16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

The evaluation of the status info, e.g. in the case of an automated
query, has to be made individually for each bit.

Status bit Explanation

Bit 0

Component hardware defective

Bit 1

Component hardware defective

xxx

Bit 2

Optical measuring range exceeded

Bit 3-31 -

NiCaVis 705 IQ Appendix: Glossary

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10 Appendix: Glossary

Absorbance (Absorp­tion)

Attenuation of the light beam when it penetrates the sample.

Adjusting To manipulate a measuring system so that the relevant value (e.g. the

displayed value) differs as little as possible from the correct value or
a value that is regarded as correct, or that the difference remains
within the tolerance.

BSB, BOD Abbreviation for the "Biochemical Oxygen Demand". The biochemical

oxygen demand of the amount of oxygen required by microorganisms
in order to aerobically decompose organic substances in an aqueous
solution.

Calibration Comparing the value from a measuring system (e. g. the displayed

value) to the correct value or a value that is regarded as correct.
Often, this expression is also used when the measuring system is
adjusted at the same time (see adjusting).

Calibration value pair Value pair consisting of the raw value measured by the

NiCaVis 705 IQ sensor, and a reference value measured e.g. by a
laboratory determination. The calibration value pairs are the result of
the user calibration.

Concentration Mass or amount of a dissolved substance per volume, e. g. in g/L or

mol/L.

CSB, COD Abbreviation for the "Chemical Oxygen Demand". The chemical oxy-

gen demand is the equivalent amount of oxygen that is required for
the complete oxidation of the organic (major part) and anorganic
(minor part) substances in an aqueous solution.

DOC Abbreviation for dissolved organic carbon. Concentration of

dissolved, organically bound carbon in water.

Measured parameter The measured parameter is the physical dimension determined by

measuring, e.g. pH, conductivity or D.O. concentration.

Measured parameter
(correlated)

With the measuring method used, a correlated measured parameter
is not determined directly. A correlated measured parameter can,
however, be derived from a determinable measured parameter. The
precondition for this is that there is a reproducible interrelationship
(correlation) between the determinable and correlated measured
parameter.

Measured value The measured value is the special value of a measured parameter to

be determined. It is given as a combination of the numerical value and
unit (e. g. 3 m; 0.5 s; 5.2 A; 373.15 K).
The measured value is determined from the raw value taking into
account the data from a user calibration. The measured value is
displayed together with the raw value in the measured value display.

Appendix: Glossary NiCaVis 705 IQ

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Measuring gap The measuring gap is between the two measurement windows. In the

measuring gap, the light beam penetrates the test sample.

Measuring system The measuring system comprises all the devices used for measuring,

e. g. measuring instrument and sensor. In addition, there is the cable
and possibly an amplifier, terminal box and armature.

NO2-N The proportion of nitrogen coming from nitrite.

NO3-N The proportion of nitrogen coming from nitrate.

Raw value The raw value is determined from the spectrum while taking into

account the data from the zero adjustment. The raw value is displayed
on the right side of the measured value in the measured value display.

Reference sample Random sample of the test sample for comparative chemical-analyt-

ical laboratory analyses intended for user calibration.

Resolution Smallest difference between two measured values that can be

displayed by a meter.

Sample matrix Composition of the test sample of different individual substances.

Test sample Designation of the test sample ready to be measured.

Ultrapure water (H2O
dist.)

Ultrapure water is distilled or deionized water suitable for analysis
purposes.

Zero adjustment Measuring and saving the absorbance spectrum of ultrapure water.

Defines the zero points in the spectrum for all wavelengths. The light
beam is not alleviated at the zero point. The zero point influences the
calculation of the raw value.

TOC Abbreviation for total organic carbon. Total amount of organically

bound carbon in water.

UVT (dissolved) Transmission measurement after turbidity correction

(reference measurement at 550 nm).

UVT (total) Transmission measurement at a certain wavelength.

The UVT-254 value is standardized to 10 mm gap width.

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