wtw IFL 700 IQ User manual

OPERATING MANUAL
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IFL 700 IQ
IFL 701 IQ
IQ SENSOR NET SLUDGE LEVEL SENSOR
IFL 700 IQ

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IFL 70x IQ
Copyright © 2012 Xylem Analytics Germany GmbH
Printed in Germany.

IFL 70x IQ Contents
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IFL 70x IQ - Contents
1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
1.1 How to use this component operating manual . . . . . . . . 1-5
1.2 Structure of the IFL 70x IQ sludge level sensor . . . . . . . 1-6
1.3 Recommended fields of application . . . . . . . . . . . . . . . . 1-7
2 Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
2.1 Safety information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
2.1.1 Safety information in the operating manual . . . . 2-8
2.1.2 Safety signs on the product . . . . . . . . . . . . . . . . 2-8
2.1.3 Further documents providing safety information
2-8
2.2 Safe operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
2.2.1 Authorized use . . . . . . . . . . . . . . . . . . . . . . . . . 2-9
2.2.2 Requirements for safe operation . . . . . . . . . . . . 2-9
2.2.3 Unauthorized use . . . . . . . . . . . . . . . . . . . . . . . 2-9
3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
3.1 IQ SENSOR NET system requirements . . . . . . . . . . . . . 3-10
3.2 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
3.3 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
3.3.1 General information . . . . . . . . . . . . . . . . . . . . . 3-10
3.3.2 General installation conditions . . . . . . . . . . . . 3-11
3.3.3 Influence of permanently installed fixtures . . . 3-12
3.3.4 Influence of gas bubbles and suspended
particles . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12
3.3.5 Short-term interferences due to obstacles . . . 3-13
3.3.6 Connecting the sensor . . . . . . . . . . . . . . . . . . 3-13
3.4 Initial commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15
3.5 Setting table for the IFL 70x IQ . . . . . . . . . . . . . . . . . . 3-17
3.5.1 Sensor settings menu . . . . . . . . . . . . . . . . . . . 3-17
3.5.2 Display/Extras menu . . . . . . . . . . . . . . . . . . . . 3-22
4 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-23
5 Maintenance, cleaning, accessories . . . . . . . . . . . . 5-24
5.1 General information . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-24
5.2 Cleaning of the sensor shaft and ultrasonic transducer
surface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-24
5.3 Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-26

Contents IFL 70x IQ
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6 What to do if... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-27
7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-30
7.1 Measurement characteristics . . . . . . . . . . . . . . . . . . . .7-30
7.2 Application characteristics . . . . . . . . . . . . . . . . . . . . . .7-30
7.3 General data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-31
7.4 Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-32
8 Indexes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-33
8.1 Explanation of the messages . . . . . . . . . . . . . . . . . . . .8-33
8.1.1 Error messages . . . . . . . . . . . . . . . . . . . . . . . .8-33
8.1.2 Info messages . . . . . . . . . . . . . . . . . . . . . . . . .8-34
8.2 Status info . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-34

IFL 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 system 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 IFL 70x IQ
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1.2 Structure of the IFL 70x IQ sludge level sensor
Structure
Fig. 1-2 Structure of the sludge level sensor (example: IFL 700 IQ)
Measuring
principle
The IFL 70x IQ is based on the ultrasonic measuring principle. Ultrasonic
waves transmitted by the ultrasonic transducer are totally or partly reflected
by layers at which the density of the measuring medium changes (e.g. sludge
blanket, bottom of the basin), and then received again. Based on the reflec-
tion intervals, the distance between the levels and the ultrasonic transducer
is determined:
1Wiper (only IFL 700 IQ)
2Ultrasonic transducer
3Marking for immersion depth 0.1 m
4Shaft
5Plug head connector
6Leg supports
1
2
3
4
5
6

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Fig. 1-3 Principle of the ultrasonic measurement
Wiper (cleaning
system)
The IFL 700 IQ sensor has a mechanical wiper that effectively cleans gas
bubbles and dirt off the ultrasonic transducer. The wiper operates contactless
and is maintenance-free and wear-free.
1.3 Recommended fields of application
Sludge level control and monitoring in waste water treatment.
1Transmitted ultrasonic waves
2Echo reflected by the sludge blanket (short reflection interval)
3Echo reflected by the bottom area (long reflection interval)
Sludge blanket level
1
3
2
Ultrasonic
transducer
Bottom
Detailed information on the subject of sludge level measurement
is given for example in the DWA information sheet no. 256 "Proz-
essmesstechnik auf Kläranlagen, Teil 8: Messeinrichtungen zur
Bestimmung des Schlammspiegels" (Process measuring tech-
nique at wastewater treatment plants, part 8: Instrumentation for
determination of the sludge level".

Safety instructions IFL 70x IQ
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2 Safety instructions
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
serious (irreversible) injury or death if the safety instruc-
tion is not followed.
CAUTION
indicates a possibly dangerous situation that can lead to
slight (reversible) injury if the safety instruction is not fol-
lowed.

IFL 70x IQ Safety instructions
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2.2 Safe operation
2.2.1 Authorized use
The authorized use of the IFL 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 IFL 70x IQ
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3 Commissioning
3.1 IQ SENSOR NET system requirements
Software statuses
of the controller
and terminal
components
The operation of the IFL 70x IQ requires the following software versions in
the IQ SENSOR NET:
3.2 Scope of delivery
Sludge level sensor IFL 700 IQ or IFL 701 IQ
Operating manual
3.3 Installation
3.3.1 General information
NOTE
Sharp objects can damage the ultrasonic transducer. Please be careful, es-
pecially when handling sharp tools, when cleaning and during transport.
NOTE (only IFL 700 IQ)
If the sensor is connected to the IQ SENSOR NET, the mechanical wiper may
start moving unexpectedly. Make sure that the swivel range of the wiper is
always free. Only put the sensor down on its leg supports on a flat surface
with the ultrasonic transducer pointing downward.
MIQ/MC2Controller software: Version 3.35 or higher
MIQ/TC2020 XT Terminal software: Version 3.35 or higher

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3.3.2 General installation conditions
Fig. 3-1 Ideal installation environment
Immersion depth
(= 0.1 m)
Water
depth
Sludge level
Depth of the
sludge level
Height of the
sludge level
Vertical
installation
Wall
Bottom of the basin
Immersion depth
Dead zone
(= 0.4 m)
Measurement cone approx. 7°
(half-value angle)
free of fixtures and obstacles
Minimum distance
from basin wall = 0.2 m + 0.05 * (water depth - immersion depth in m)

Commissioning IFL 70x IQ
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Sensor installation The following conditions should always be met:
Vertical
Sufficient distance from the basin wall (minimum distance, see formula in
Fig. 3-1).
If the distance to the wall of the basin is small, the wall should be rather
smooth.
Immersion depth (0.05 m ... 3 m)
Minimum distance between the sensor bottom and sludge blanket = 0.4 m
("dead zone").
Ideally, at the installation location the ultrasonic cone is free of barriers that
move the sensor from its position or cross the measuring cone and thus
cause interfering echoes.
Additional measures are required in order to minimize negative impacts (see
section 3.3.5).
3.3.3 Influence of permanently installed fixtures
Permanently installed fixtures in the vicinity of the measuring cone reflect the
ultrasonic waves transmitted and thus cause interfering echoes.
If there are permanently installed fixtures in the expectation range of the
sludge blanket level, it is not possible to clearly assign an echo to a sludge
level. In this case, a different installation location must be selected (e.g. with
a greater distance from the wall). Alternatively, the evaluation range can be
adjusted.
3.3.4 Influence of gas bubbles and suspended particles
Gas bubbles and suspended particles reduce the propagation of ultrasonic
waves. A high concentration of gas bubbles and suspended particles can in
extreme cases lower the range of the sensor.
If there are range problems, the sensor must be immersed deeper (note the
dead zone and maximum depth of immersion).
With the IFL 700 IQ sensor, the mechanical wiper removes gas
bubbles and dirt from the surface of the ultrasonic transducer.

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3.3.5 Short-term interferences due to obstacles
Certain events may for a short period of time affect or interrupt the measure-
ment. In waste water treatment plants, these events are normally:
Moving scrapers that displace an installed sensor from its measuring posi-
tion or cross its measuring cone.
Fixtures permanently installed in the basin such as pipes or scrapers that
are touched by the measuring cone of a sensor on a scraper bridge when
rotating.
Interferences due to obstacles can be suppressed with the aid of certain set-
tings (see setting table, section 3.5).
The default settings may have to be adjusted as necessary.
A tilting armature is available for installation in basins with a chain scraper or
linear scraper for scum removal. Thus the sensor is temporarily pulled out of
the basin by the moving scraper.
3.3.6 Connecting the sensor
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 SACIQ standard model, the SACIQ SW sensor connection cable is opti-
mized concerning its resistance to corrosion. 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 com-
pressed air).
Connecting the
sensor to the
sensor connection
cable
How to connect the SACIQ (SW) sensor connection cable to the
terminal strip of an MIQ module is described in chapter 3 INSTAL-
LATION of the IQ SENSOR NET system operating manual.
Do not suspend the sensor on the sensor connection cable. Use
a sensor holder or an armature. Information on this and other
IQ SENSOR NET accessories is given in the WTW catalog and on
the Internet.
1 Take the protective caps off the plug connections of the sensor and
the SACIQ (SW) sensor connection cable and keep them safe.

Commissioning IFL 70x IQ
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NOTE (only IFL 700 IQ)
If the sensor is connected to the IQ SENSOR NET, the mechanical wiper may
start moving unexpectedly. Make sure that the swivel range of the wiper is
always free. Only put the sensor down its leg supports on a flat surface with
the ultrasonic transducer pointing downward.
Fig. 3-2 Connecting the sensor
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
Prerequisite for the display of measured values of the IFL 70x IQ
on a terminal of the IQ SENSOR NET system is the current soft-
ware version of the controller and the terminal.
The current software is available on the Internet under
www.WTW.com.
1Install the sensor at the measuring location and establish the connec-
tion to the IQ SENSOR NET. (see section 3.3).
2Using <>, select the IFL 70x IQ sensor in the measured value
display.
3Open the Display/Options / Extended sensor functions menu.
The display shows the echo profile and certain special menus.
4Open the Sensor settings / menu.
5Adjust the following settings for the measuring location
(Sensor settings):
Immersion depth
Extended settings / Temperature
(average water temperature at mean water depth)
Water depth
(water depth to the bottom of the basin at the measuring location)
Setting of
Temperature
If the average water temperature fluctuates due to seasonal
changes we recommend to adjust the mean temperature on the
instrument according to the current season.
Setting of Water depth
The Water depth setting should be consistent with reality as
much as possible. Therefore, we recommend to determine the
water depth at the measuring location and enter it.
6Using Save and quit, confirm the settings and switch to the dis-
play of the echo profile.

Commissioning IFL 70x IQ
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Fig. 3-3 Sample echo profile (sludge blanket height)
1 Entered Water depth (shaded)
2 Move the cursor along the profile (with <>)
3Topmost echo:
First rise of the sludge concentration viewed from the surface of the
water
4Strongest echo:
Most concentrated sludge (greatest intensity)
5 Status line (values at the cursor position)
If the sensor does not provide the expected measured value (e.g.
measured value too high, too low or too fluctuating), there are
further settings, filters and functions available with which you can
optimize the evaluation of the echo profile to meet your require-
ments (Sensor settings, see section 3.5).
6Use <M> to switch over between the measured value display and
echo profile.
The echo profile is continued to be represented in the background
and can quickly be displayed.
or
Use Quit to exit the Extended sensor functions menu.
The representation of the echo profile is thus terminated. The echo
profile can be reactivated with the Display/Options / Extended sensor
functions menu.
2
3
5
4
1

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Fig. 3-4 Measured value display with main and secondary measured value
3.5 Setting table for the IFL 70x IQ
3.5.1 Sensor settings menu
Carrying out
settings
The sensor settings can be accessed from the following menus:
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 sen-
sor. The exact procedure is given in the relevant IQ SENSOR NET system
operating manual.
Using <>, select the IFL 70x IQ sensor in the measured value display.
Using <M>, open the Display/Options / Extended sensor functions menu.
Open the Sensor settings menu.
1 Measured value
2 Number of echoes found
Default values are marked in bold.
1
2
Setting Selection/values Explanation
Measuring mode Details see Fig. 3-1 in section 3.3.2
Sludge level height Position of the sludge blanket level in rela-
tion to the bottom of the basin (SLH).

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Sludge level depth Position of the sludge blanket level in rela-
tion to the surface of the water (SLD).
Unit
m
ft
Selection of the unit for the distance
Meter
Foot
Immersion depth 0.05 ... 0.10 ... 3.00 m Distance between the surface of the ultra-
sonic transducer (underside of the sen-
sor) and the surface of the water (see Fig.
3-1 in section 3.3.2).
Water depth 0 ... 6... 18 m Vertical distance between the surface of
the water and the bottom of the basin at
the measuring location (see Fig. 3-1 in
section 3.3.2).
The water depth can be determined by
plumbing.
Setting Selection/values Explanation

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Setting Selection/values Explanation
Method The rising side of the echo is evaluated for
the measured value determination. One of
two methods can be selected for this.
Rel. threshold The measured value is equivalent to the
point where the intensity of the echo
reaches the adjusted relative threshold.
The value relates to the maximum of the
echo intensity (100 %):
Maximum gradient The measured value is equivalent to the
point with the maximum gradient:
Rel. threshold value 25 ... 75 ... 100 % Threshold value for evaluation according
to the Rel. threshold method.
100 %
Depth
Measured value
25 %
Relative
threshold
Depth
Measured value
Maximum
gradient

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Echo selection With this setting, the echo to be evaluated
is determined.
The echo is automatically identified
according to the criterion that was set.
Topmost echo The topmost echo (from the surface of the
water) is used for calculating the mea-
sured value.
To ensure that a weak echo can be iden-
tified among the surrounding echoes, the
interfering echoes can be suppressed
with the setting, Minimum intensity.
Strongest echo The echo with the greatest intensity is out-
put as the measured value.
With spongy sludge, the bottom echo is
the strongest echo of the echo profile.
To avoid taking the bottom echo as the
sludge echo, the Water depth and/or Eval-
uation range setting should be adjusted in
such a way that the bottom echo is not
taken into account.
Follow echo On
Off
Filter effecting that a new echo is only
evaluated if the new echo is in the vicinity
of the echo previously determined. The
tolerance range moves with each new
valid echo.
Minimum intensity 5 ... 30 ... 100 Filter that ignores echoes with low inten-
sity.
Evaluation range Filter that ignores measured values out-
side the selected range.
Complete The entire area between the end of the
dead zone and the bottom of the basin is
displayed.
Limited
Start
End
Filter that reduces the measuring range to
the limits required. Thus, interfering
echoes of any fixtures installed in the
basin can be ignored.
Setting Selection/values Explanation