Xylem wtw NitraVis 705 IQ User manual

OPERATING MANUAL
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NitraVis 701 IQ
NitraVis 705 IQ
OPTICAL SENSOR FOR NITRATE

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NitraVis 70x IQ
Copyright ©2017 Xylem Analytics Germany GmbH
Printed in Germany.

NitraVis 70x 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 NitraVis 70x IQ . . . . . . . . . . 6
1.4 Structure of the sensor NitraVis 70x 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 NitraVis 70x 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 SENSOR NET . . . . . . 14
3.4 Initial commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.4.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.4.2 Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4 Measurement / Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
4.1 Determination of measured values . . . . . . . . . . . . . . . . . . . . . 21
4.2 Measurement operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.3 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.3.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4.3.2 User calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.3.3 Sensor check/
Zero adjustment . . . . . . . . . . . . . . . . . . 28

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5 Maintenance and cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.1 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.2 Sensor cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.2.1 Cleaning agents and accessories . . . . . . . . . . . . . . . . 34
5.2.2 General steps to be taken . . . . . . . . . . . . . . . . . . . . . . 35
5.2.3 Basic cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5.2.4 Cleaning the measuring gap . . . . . . . . . . . . . . . . . . . . 37
6 Spare parts, maintenance equipment, accessories . . . . . . . . 38
7 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
8 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
8.1 Measurement characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . 43
8.2 Application characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
8.3 General data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
8.4 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
9 Indexes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
9.1 Explanation of the messages . . . . . . . . . . . . . . . . . . . . . . . . . . 47
9.1.1 Error messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
9.1.2 Informative messages . . . . . . . . . . . . . . . . . . . . . . . . . 50
9.2 Status info . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
10 Appendix: Glossary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

NitraVis 70x 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 NitraVis 70x IQ
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1.2 Field of application
The NitraVis 70x IQ (TSS) is an online sensor for the on-site determination of
nitrate (and total suspended solids - TSS) 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 reli-
able 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 NitraVis 70x IQ
The sensor operates according to the measuring principle of UV-VIS- spectrom-
etry.
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 distri-
bution 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.
NitraVis 701 IQ Aeration tank or inlet
NitraVis 705 IQ Outlet

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1.4 Structure of the sensor NitraVis 70x 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
1Light source
2Sender of the optical system
3Measuring gap between the measurement windows
4Receiver of the optical system
5Detector
6Measuring beam
7Reference beam
8Connection for the optional compressed air cleaning system
7
6
34
8
21 5

Safety NitraVis 70x 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 infor-
mation 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 SENSOR 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 seri-
ous (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.

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2.2 Safe operation
2.2.1 Authorized use
The authorized use of the NitraVis 70x IQ consists of its use as a sensor in the
IQ SENSOR NET. Only the operation and running of the sensor according to the
instructions and technical specifications given in this operating manual is autho-
rized (see chapter 8 TECHNICAL 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 TECHNICAL DATA).

Commissioning NitraVis 70x IQ
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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 NitraVis 70x IQ requires the following software versions in
the IQ SENSOR NET:
For cleaning with
compressed air via
a relay
3.2 Scope of delivery of the NitraVis 70x IQ
The following parts are included in the scope of delivery:
SensorNitraVis 70x 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
NitraVis 70x IQ (see chapter 6 SPARE 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 sed-
iment 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 sus-
pended mounting).
Mount the enclosed shock protectors (see section 3.3.2). Their soft rubber com-
pound 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 NitraVis 70x IQ. Information on this and other
IQ SENSOR 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
ENSOR N ET accessories
is given in the WTW
catalog and on the Internet.
How to connect the SACIQ (SW) sensor connection cable to the ter-
minal strip of an MIQ module is described in chapter 3 INSTALLATION
of the IQ SENSOR 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 NitraVis 701 IQ sensor is prepared for operation in the aeration tank and
calibrated in the factory. For use in the inlet you only have to change the
Measuring location setting.
The NitraVis 705 IQ 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 CALIBRATION).
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 (sec-
tion 3.4.2).

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3.4.2 Settings
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 follow-
ing 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 SENSOR NET system operating
manual.
Default values are marked in bold.
Time
Adjustment time
Measurement
Measuring
cycle
Measuring interval
Cleaning
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 NitraVis 701 IQ:
 Activation
 Inlet
 Outlet
NitraVis 705 IQ:
 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.
When the measurement location is
changed, all virtual sensors are
deleted.
Measuring range - Display of the measuring range
(see chapter 8 TECHNICAL 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
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, mea-
sured 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, time-
controlled 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 air is set in the menu 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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Quit - The display switches to the next higher
level without storing the new settings.
Menu item Settings Explanations