Products

Solutions

Liquid Analysis

Making sure your WWTP
runs and runs and runs
Efficient and effective
wastewater treatment

The perfect ingredients for
operation and maintenanceof your WWTP
Optimum instrumentation:
Specialized analytical devices makeyour work easier, ensure thereliability of your processes andoutlet values and help to reduce
costs.
Plant maintenance withadded value:
Perform sensor maintenance inthe comfort of the lab, thus
minimizing time spent in the field
exposed to the elements.
Smart automation:
The Liquiline Control gets
phosphate and nitrogen undercontrol.
Customized solutions:Bespoke measuring cabinets
and containers provide space foranything needing protection.
Strong partner:
With measuring technology,
consulting and service available
from a single source, the operationand maintenance of your plant isstraightforward and future-proof.

Services

2

Making sure your WWTP runs and runs and runs

Fresh ideas for your wastewater treatment process
Even the ancient Romans were aware of the interrelation
between wastewater and fresh water. They built viaducts
to make fresh water sources located outside of the city
available to the city. However, they also built the "Cloaca
Maxima", a canal in the heart of Rome, which transported
wastewater from the Forum Romanum into the River Tiber.
Nowadays, wastewater is treated prior to discharge intorivers and other surface waters, and this is done inaccordance with legally prescribed outlet values.
Compliance with these values ​​protects the environmentand our drinking water supplies and is therefore ofparamount importance.
As a result, wastewater treatment has become a complex
task. Not only is it necessary to maintain optimum
conditions for the bacteria in the biological treatment phaseand to figure out the correct precipitant dosage, there isusually also a requirement to reduce pollutants andnutrients as cost-efficiently as possible. At the same time,
the plant must be able to cope with fluctuating levels of
influent, depending on the weather, the time of year andthe wastewater-producing companies in the catchment
area, for example. Furthermore, industrial WWTPs often
handle loads that require chemical rather than biologicaltreatment.

These are all conditions that the operator and staff of the
WWTP have to contend with, for example when ­maintaining
measuring technology in all kinds of weather, whenresolving faults in the middle of the night (emergency
standby service) and when regulating oxygen and Co
levels across a wide variety of loads. There is also theemergence of megatrends, such as the increasing scarcity
of drinking water brought about in part by the rapidly
increasing global population. Purified wastewater will
therefore have an increasingly important role to play as asource of drinking water and industrial water. This callsfor even stricter limit values for outflow water and ­createsand even greater need to operate wastewater treatment
processes in a manner that is safe and trouble-free.
Take a look at the following pages to find out about the
Memosens and Liquiline devices that have been speciallydeveloped with wastewater treatment in mind. Not only dothey make your work at the WWTP easier, they also guarantee
the reliability of your processes and outlet values and help
to save costs. And if that isn't enough, take a look at the
Liquiline Control automation solutions. They independently
regulate your plant based on the incoming load, optimize
the decomposition of pollutants and nutrients and offer
exciting innovations such as remote control by tablet andsmartphone.

Making sure your WWTP runs and runs and runs

Memosens and Liquiline – a dynamic duo for your WWTP
The Liquiline platform forms the basis for our transmitters,
samplers and analyzers. With these devices, you can ­monitor,
control and regulate your entire wastewater treatment
process. Benefits include the convenient, standardized­operation of all devices throughout your entire plant andthe protection of your process against operating errors.
And since we use same standardized hardware in all of
the devices, you also benefit from a straightforward, costeffective spare parts inventory. Furthermore, you can easily
upgrade our Liquiline products to include relays, sensor
inputs or fieldbuses, for example, ensuring flexibility for
years to come.
The cutting-edge
sensor technology
Memosens digitizes the measured value in the s­ ensor andsends it to the transmitter via a non-contact, disturbancefree connection. Since its introduction in 2004, it has
become the leading global standard in liquid analysis.
A broad portfolio of Memosens products has been helping
to improve the safety, efficiency, transparency and qualityof processes in all industries ever since.
• 100% reliable: digital data transmission via inductive,
corrosion-free bayonet lock• Sensors easily connected• Sensor head stores calibration and sensor information
for predictive maintenance• Plug and play with precalibrated sensors increases
process and measurement availability• International standard

Overview of Liquiline platform• Hardware components and operating concepts are
standardized across all transmitters, analyzers andsamplers in the Liquiline series• Ability to connect up to 8 sensors for different
parameters• Automatic sensor detection saves times during­commissioning and when replacing worn sensors• Control functions, e.g. precipitant dosing, oxygenation
during sludge activation, disinfection of outflow wateror sludge thickening• Seamless integration into any process control system(PCS) via 0/4 to 20 mA, HART, PROFIBUS DP, Modbus
RS485, Modbus TCP, EtherNet/IP• Integrated web server enables remote access from any
location, also via tablets and smartphones• Easily extensible thanks to standardized hardware

A core component of the Liquiline platform is digital
Memosens technology. Sensors equipped with Memosens
technology store a wide range of data directly in the sensor
head. This includes information such as sensor type, serial
number, calibration results (e.g. slope and zero point) andmuch more. Liquiline devices can therefore automaticallydetect any sensor within seconds and adopt the saved datafor use in operation. This is true plug and play functionalitythat makes your work easier and minimizes interruptions
to measurement during sensor maintenance.

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Making sure your WWTP runs and runs and runs

How do I increase the efficiency and effectiveness of my wastewater treatment process?
Many Liquiline products allow you to connect several
Memosens sensors in any combination. This turns samplers
and analyzers into fully-fledged measuring stations offering
you a range of application possibilities. For example, you
can connect the Orbisint CPS11D pH sensor to the Liquiline
System CA80PH phosphate analyzer. You can thus use theanalyzer to set up closed-control loops, which regulate yourphosphate precipitant dosage depending on the load – atan optimum pH level. This enables you to improve phosphate
precipitation while optimizing precipitant usage.
Efficient and effective wastewater treatment
By positioning our fully automatic samplers at both theinlet and outlet, you can assess how effectively pollutants
are decomposed (effectiveness) and how much energy isrequired to do so (efficiency). Sampling is safe and easy inthis case: simply specify the time interval, and the sampler
looks after the rest (time-controlled sampling).

The solution is event-controlled sampling: a samplerthat has been upgraded to a measuring station can­accurately detect high loads and then independently
take a sample, thus providing you with reliable proof ofhigh influent loads.
This facilitates the introduction of a billing system in the
sewage network, since it is possible to identify clearly whois responsible for a load peak (a factory, for example).

Time-controlled / event-controlled sampling
Time-controlled
sampling:

Event-controlled
sampling:

Reliable detection of critical loads
Critical loads in the inlet, such as high salt concentrations
due to the salting of roads in winter, or high carbon
concentrations released during food production, canhowever "slip through" these time intervals. Under certain
circumstances, this can lead to a deterioration in outlet
values (reduced effectiveness) with legal consequences.
There may also be a drop in efficiency if the plant has
to run at full capacity during load peaks.
With time-controlled sampling, samples are taken at definedintervals. With event-controlled sampling, a sample is taken
as soon as the incoming load violates defined limit values. The
sample is stored in a separate bottle.

Sampling / event monitoring
Transmitter andsampling control
modulePump

Sensors for event
monitoring
Samplebottles

ChannelA measuring station monitors the influent of a WWTP. For event
monitoring, a pH sensor (Orbisint CPS11D) and a conductivity sensor(Indumax CLS50D) were installed in immersion assemblies (Flexdip
CYA112) and connected to a sampler (Liquistation CSF48).

M

Sampling

By connecting up to four sensors, the Liquistation CSF48
sampler can be upgraded to a fully-fledged measuring station.
This means that time-controlled samples can be taken as well
as event-controlled samples.

Making sure your WWTP runs and runs and runs

Advance detection of critical loads
If the measuring station is installed upstream from the
WWTP inlet or in the sewage network, it will detect criticalloads before they reach the plant. High loads can then be
redirected to retention basins in good time and fed into thewater treatment process in controlled amounts. This
enables your process to run in a more stable and therefore
more efficient and effective manner. Incidentally, thediversion of loads can be completely automated.
Convenient and quick: remote access from anywhere
The Liquiline platform offers you the widest range ofcommunication options available on the market. This not
only makes for easy integration in your process control

system, it also provides you with convenient remote accessto the devices via the various fieldbuses and the integrated
web server. You can therefore monitor all of the analyticalmeasuring points at all times – from the control room
as well as from outside the plant, e.g. during emergency
standby service. Should a problem occur in the process,you can evaluate its urgency remotely. Does the problem
need to be resolved immediately on site? Or can you wait
until tomorrow to go on site? If you were to change a few
parameters remotely, e.g. manipulated variables, wouldthat eliminate the need for a site visit? You are therefore
much less dependent on weather conditions and can
avoid call-outs in the middle of the night and in extreme
weather.

Monitoring of wastewater sewage network
Other dischargers

Measuring station

Industry

Pump
stationAgriculture

Residentialarea

Hospital

Measuring station
Pump
stationMeasuring station
Pump
station

WWTP
Aeration basin

Sludge treatment
Storage basin

Secondary clarification

When measuring stations are positioned in the sewage network, they can detect critical loads and divert them to storage basins
before they reach the WWTP. You can also identify with certainty who the dischargers are.

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Making sure your WWTP runs and runs and runs

Plant maintenance with added value
Time is often in short supply when it comes to the dayto-day running of a WWTP. This applies even more tounmanned plants where staff visit the site only occasionallyto carry out maintenance. From pH to solids, all sensors
with Memosens technology can be precalibrated or
preadjusted in the lab or factory. Since all of the importantdata including calibration information are stored in thesensor, there is no need to carry out maintenance on site.
Instead, simply connect your own ready-to-use sensors.

strong winds may cause the sensor to heat up or cool down.
This results in an incorrect adjustment and therefore
incorrect measured values.

In this way, plant maintenance and sensor calibration canbe physically separated and performed at different times.
This improves the quality and reliability of your processenormously and makes for more efficient maintenance.

Maintenance you can scheduleSensors prepared in this way can then be put into use
at a time that suits you, e.g. during an scheduled planned
maintenance activity. You simply take the sensors you
replaced with you and prepare them at the next opportunity
in your factory so that they can be used the next timea replacement is required. This type of maintenancestrategy enables you to avoid measuring point failures,
reduce unplanned call-outs in the field and therefore saveconsiderable time and money. In the unlikely event of a
failure, simply use a prepared sensor to get themeasurement back up and running again. Since replacing asensor in Liquiline devices is extremely easy, it can be doneby staff members without any knowledge of analytics.

Quality leap in sensor maintenance
Performing conventional sensor maintenance activities
at the basin rim can leave you exposed to the elements.
In certain types of weather, this is not only inconvenient
but also affects the quality of the maintenance work andtherefore the quality of the sensor's measured values. For
example, if an analog pH sensor is detached from the cable
while it is raining, its metal contacts may get wet and leadto a faulty measured value. And if the slope of an oxygen
sensor is adjusted in air, exposure to bright sunlight or

Performing maintenance in your lab or factory allows
you to create constant conditions – without any external
influences. This increases the quality of the calibrationand therefore the accuracy of your sensors. And it also
happens to be more convenient for you.

Making sure your WWTP runs and runs and runs

Reliable sensor cleaning
Automatable cleaning options add the finishing touch to
the Memosens Liquiline team. A nozzle attached to thesensor head sprays the sensor with compressed air or waterand an additional cleaning fluid if desired. This is a reliable
way to prevent buildup on the sensor and ensures long andtrouble-free operating times. It also eliminates the need formoving parts, such as wipers, in your process. Incidentally,
this type of cleaning is suitable for all process stages andcan be used even in fatty media.
The cleaning process is controlled by your Liquiline device.
You can specify fixed time intervals and also stipulate thatcleaning be performed in between times should the sensor
become soiled. In this case, the Liquiline device receives asignal from the sensor that triggers the cleaning function.
Automated operation
With the available controllers (e.g. precipitant dosage),
automatic sensor cleaning function and maintenanceactivities that can be planned, there is no reason why
you cannot automate your wastewater cleaning process.
You can even adjust the level of automation to suit yourprecise needs. It's just as feasible to automate the diversionof critical loads to retention basins as it is to set up an
unmanned plant.

Air cleaning system of the Turbimax CUS52D turbidity sensor

Our Memosens sensors and Liquiline transmitters, analyzers
and samplers actively support you in your daily work. It
has never been easier, more convenient and safer to treat
wastewater efficiently and to comply with outlet values.
Why not give it a try?

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8

Making sure your WWTP runs and runs and runs

Products and solutions for all analytical measuring points in WWTPs
Inlet

Instrument

Information

pH

CPS11D

Robust sensor for all measuring points

Conductivity (Cond)

CLS50D

Particularly dirt-resistant sensor

COD

CA80COD
CA72TOC
CAS51D

Colorimetric COD analyzer
High-temperature TOC analyzer
Optical CODeq sensor for trend identification

Ammonium (NH4+)

CA80AM
CAS40D

Colorimetric ammonium analyzer
Ion-selective sensor for trend identification

Sampler

CSF48

Automatic sampler

Primary and secondary clarification

Instrument

Information

Sludge level (SL)CUS71D

Sensor for determining sludge deposit zone

Biological treatment

Instrument

Information

Nitrate (NO3)CAS51D
CAS40D

Optical sensor with longterm stability
Ion-selective sensor for trend identification

pH

CPS11D

Robust sensor for all measuring points

pH/ORP

CPS16D

Combined pH/ORP sensor

Suspended solids (SS)

CUS51D

Low-maintenance, dirt-resistant sensor

Ammonium (NH4+)

CAS40D

Ion-selective sensor for trend identification

Oxygen (O2)

COS61D

Optical sensor for oxygen control

Orthophosphate (PO4)CA80PH

Colorimetric orthophosphate analyzer

Chlorination / disinfection

Instrument

Information

Chlorine (CL)CCS120Total chlorine sensor for free and ­combined chlorine

Overview of analytical measuring points in a WWTP
From sewage
network

A pH

A CondA COD

Sampler

A NH4+

Aeration
basin

A pH

A NO3

A SS

A NH4+

A O2

A PO4

M

Sand / fat removal

Primary
clarifier

L SL

Blower

A SS

To fat disposal
To sand washer

To sludge
treatment

Return activated sludge (RAS)Making sure your WWTP runs and runs and runs

OutletInstrument

Information

pH

CPS11D

Robust sensor for all measuring points

Turbidity (TU)

CUS51DCUS52D

Sensor with wide measuring range
Sensor for low turbidity (e.g. industrial water)

COD

CA80COD
CA72TOC
CAS51D

Colorimetric COD analyzer
High-temperature TOC analyzer
Optical CODeq sensor for trend identification

Sampler

CSF48

Automatic sampler

Phosphorus (P)CA80TP
CA80PH

Colorimetric total phosphorus analyzer
Colorimetric orthophosphate analyzer

Nitrogen (N)CA80AM
CAS51D

Colorimetric ammonium analyzer
Optical nitrate sensor with longterm stability

Sludge treatment

Instrument

Information

Suspended solids (SS)

CUS51D

Low-maintenance, dirt-resistant sensor

Solutions and accessories

Instrument

Information

Measuring cabinet / container

As per customer specificat. Turn-key solutions for all measuring tasks

Automation solution

Liquiline Control

Control of nitrogen and phosphate elimination

Transmitter

Liquiline CM44

Multi-parameter device with up to eight channels

Sample preparation

CAT810, CAT820, CAT860 Filter systems for analyzers of CA80 series

Measured value simulator

Memocheck Sim CYP03DFor quick and easy commissioning

Sensor management software

Memobase Plus CYZ71D

Measuring, calibration and documentation software

Asset management software

W@M

Life cycle management

Holder + immersion assembly

CYH112 + CYA112

For installing sensors in open basins

Standards and buffers

CPY20 / CPY3
COY8
CAY40

pH buffer / ORP buffer
Gel for oxygen zero-point calibration
Reference liquid for CAS40D (NO3 and NH4+)

Chlorination

Secondaryclarifier

Chlorine
bleach
A CL

L SL

A pH

A TU

A COD

Sampler

AP

AN

A SS

To sludge
treatment

To outlet

910Making sure your WWTP runs and runs and runs

The perfect formula for your WWTP: increased effectiveness, reduced costs
The ultimate goal of any WWTP is to treat wastewaterin such a way that only clean water is released into theenvironment. If the wastewater is still contaminated withnutrients, this leads to eutrophication of the downstream
surface water, thus causing excessive algae growth (seeinformation box on right).
The volume of nutrients, such as phosphorus and nitrogen,that reach the inlet of a WWTP is referred to as the"nutrient load". For wastewater to be classed as "clean",this load must be reduced. Phosphorus is removed from thewastewater by adding precipitants, which can bedosed at various different points. However, phosphorus
cannot be completely eliminated; only the proportion
that is present in the form of phosphate can be removed.
The phosphorus value is used to monitor the WWTP outlet
while the phosphate value is used to control precipitation.
Nitrogen is reduced in the biological phase of the WWTP bymeans of nitrification and denitrification.
Challenges of phosphate precipitation
Iron salts or aluminum salts are the precipitants usuallyused. If the dosage is too high, this can increase the salinityof the biology and result in increasing sludge volumes. Toomuch salt increases the number of ions in the water, which
in turn changes the pH value and can ultimately lead to

What is eutrophication?
The term eutrophication describes when water bodies
become excessively enriched with nutrients (in particular
phosphorus and nitrogen), causing a shift in thebiodiversity. This oversupply of nutrients causes rapid
algae growth, which in turn leads to a change in theoxygen content of the water.
Initially, the algae produce an oversupply of oxygen,
while reproducing at a rapid pace. This continues until
the algae no longer have a sufficient supply of nutrients.
The algae then stop producing oxygen and die off inlarge numbers, thereby depleting any remaining oxygenin the water. This leads to the loss of other livingorganisms, e.g. fish, crabs, plants, etc., due to an
inadequate supply of oxygen. The water turns green.

corrosion of the system. Higher sludge volumes mean
increased disposal costs. Last but not least, overdosing
means that the precipitant, which is usually very costly,
goes to waste.

The orthophosphate analyzer, Liquiline System CA80PH, provides reproducible measured values for reliable precipitant dosage.

Making sure your WWTP runs and runs and runs

With the ISEmax CAS40D ion-selective sensor, you can measure ammonium and nitrate directly in the aeration basin. This enables nitrogen
reduction in the biological phase to be controlled based on load – and the process to be optimized.

The EU Water Framework Directive (WFD) specifies
environmental objectives for surface waters that have a
direct impact on the outlet values of WWTPs. The limit
values for phosphorus in the outflow are dependent onplant size and typically range between 1 and 2 mg/l. If
required by the local conditions, e.g. if the effluent fromthe WWTP is discharged into sensitive waters, the limit
values may be significantly lower.
Full control of phosphate precipitation
If precipitant dosage is optimized, the potential for savings
can be significant. The dosage is at an optimum level if
your plant reliably adheres to the limit value but does notuse more precipitant than required. How do we optimize
phosphate precipitation? It can be done, for example, byusing the Liquiline Control to automate the dosage. This
involves a controller that doses the precipitant in accordancewith the actual load and your individual phosphorus limit
value. This results in phosphate precipitation that is reliable
and easy on resources.
Challenges of nitrogen reduction
The main components of nitrogen are ammonium andnitrate. In the biology of the WWTP, bacteria convert theammonium to nitrate through the addition of oxygen(nitrification). This continues until there is (almost) no
ammonium left. Other bacteria then convert the nitrate tomolecular nitrogen (denitrification). This simply escapes
into the atmosphere and is therefore eliminated from thewastewater. Incidentally, no more oxygen is added during
the denitrification process. This to ensure that the bacteria
consume the oxygen present in the nitrate.
The key issue is to establish when and how much oxygen isrequired for nitrification in order to achieve an optimum
level of nitrogen reduction. The oxygen is injected into theaeration basin using compressors. These require enormous
amounts of electricity – up to 70% of the entire energy
requirement of a plant. If too much oxygen is added, energy
and money are wasted. If too little is added, the outlet
values deteriorate.
Full control of nitrogen reduction
Optimum nitrogen reduction requires optimum coordinationof the nitrification and denitrification processes. On the one
hand, this involves controlling oxygenation during sludge
activation in accordance with the load and the individual
limit values. On the other hand, it involves coordinating theduration of the nitrification and denitrification phases. In
this way, your wastewater treatment process becomes more
effective and more efficient. Our aeration control system,
the Liquiline Control, will assist you here, ensuring that
nitrogen is removed (effectiveness) and optimizing theamount of energy required to do so (efficiency).

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Making sure your WWTP runs and runs and runs

To ensure that your WWTP runs and runs and runs, we have developed a solution called the Liquiline Control. This control
system helps you to eliminate phosphate and/or nitrogen in a reliable and resource-efficient manner.
Automated phosphate precipitation with the
Liquiline Control
Phosphate concentrations are usually subject to strong
fluctuations, depending on the weather, time of day and thenature of the dischargers feeding into the wastewater
network. To deal with these fluctuations, the Liquiline
Control doses precipitant based on the load. This means thatthe control system takes the current phosphate value in theaeration basin into account along with the quantity of
wastewater that is currently flowing through the WWTP.
Precipitant continues to be added until the target value you
have configured for phosphate is reached and the limit value
for phosphorus is reliably adhered to. This also prevents
overdosing of precipitant, thereby averting an increase in thesalinity of the biology and an increase in sludge volumes.
Automated nitrogen reduction using the
Liquiline Control
The Liquiline Control can also control the reduction ofammonium and nitrate based on the influent load. Dependingon the nutrient concentration, the system controls the influxof air into the aeration basin, e.g. by regulating the speedof the compressors. This is regardless of whether the
biological phase is operated continuously or intermittently.
The measured values taken into account are oxygen in the
nitrification phase, ammonium (and nitrate, if necessary)in the transition zones as well as the quantity of wastewater
currently flowing through the WWTP. The transition zones
include the zones between the nitrification and denitri­
fication phases as well as the zones at the inlet and outletof the biological phase.
The target oxygen value, and therefore the influx of air into
the aeration basin, is adapted dynamically to fluctuations in
the influent load. At nighttime, during low-load phases,
only a small amount of air is injected; during load peaks,

With the Liquiline Control...
• you can guarantee compliance with the prescribed
outlet values• you have dynamic influent and high load peaks undercontrol at all times• you can optimize precipitant dosage and therefore theamount of precipitant used
• you can control two dosing pumps at the same time
• you can use iron-based, aluminum-based as well as
mixed precipitants• you have complete control over the process, as you
can switch to manual operation at any time.

With the Liquiline Control...
• you can guarantee compliance with the prescribed
outlet values• you can ensure that high load peaks are under control• you can optimize oxygen dosage and therefore energy
consumption• you have an oxygen control system with automatic
adjustment of the target value to the load
• you can control several biological phases
simultaneously and operate these on a continuous orintermittent basis• you can validate your process technology• you have complete control over the process, as you
can switch to manual operation at any time.
such as surges during wet weather, more air is injected. In
the case of intermittently operated plants, minimum times
for the nitrification and denitrification phases are also
taken into account.

Making sure your WWTP runs and runs and runs

How the Liquiline Control is delivered to you
The control system can be integrated into your plant in amatter of minutes. Simply install the Liquiline Control
system into an existing cabinet, connect it to your network(see information box below) and that's it! Visualization
takes place in your process control center and/or on an
on-site display. We can supply you with a touchscreen
display if desired. However, you can also use your own
monitor.
If you wish, you can also opt for a complete package, which
includes all of the measuring and control technology
enclosed in a cabinet that you can simply install on thebasin rim or in a measuring container.

"I was amazed how quick and easy it all was. Within a few seconds, the­controller was up and running. After just a few weeks, we saw that wewere able to operate the system at a very stable level while almost halving
aeration times. This of course saves on electricity."
Michael Szegedie, Plant Manager, WWTP Waldhausen (Germany)

Integrating the Liquiline Control system into your plant

Process
control system

Process control level

Liquiline Control

Digital communication

Applikation:
Belebungsregelung

Gerät:
CDW90

Auslastung Gebläse 1(Ausgänge)66 %Statussignal:
Gut
Sauerstoﬀ Becken 1(Sensor)Aktuelle Zulaufmenge(Ausgänge)0,30 mg/l

82 m³/h�Controller level

MastercontrollerDE� Benutzerführung

Additional
controllers

�

Bediener

NH4-N 2,13 mg/l
NO3-N 5,64 mg/l
O20,30 mg/l
pH7,3

� Diagnose
� Applikation

FAIRM 532,13 kg/h
66 %
45 A
35 %
30 A

� System
FIR 32,13 m3/h

FIR 12,13 m3/h

45 %
38 A

Visualisierung

Digital communication

Field level

Compressor
Valves
Pumps

Additional
instruments

The Liquiline Control can be installed in parallel with existing controllers: in the most basic example, the Liquiline Control receives therequired signals from the process control system via a digital communication protocol, such as OPC UA. Alternatively, the system can also
process analog signals.
If the Liquiline Control system is integrated into your IIoT (Industrial Internet of Things), it obtains the required data from the field level.
These are processed and returned to the field level to control the elimination of nitrogen or phosphate. Unlike the automation pyramid,
there is no hierarchical arrangement. Instead, all connected devices work in parallel.

You can integrate the Liquiline Control into new or existing plants and continue to avail of your measuring
technology that is already installed.

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Making sure your WWTP runs and runs and runs

"Key advantages of the control
system are its user-friendliness andtransparency. It can be operated ­using
only a few very explicit parameters.
This makes things easy for us!"Markus Pries, Electrician, WWTP Stadtlohn (Germany)

Liquiline Control operating menuYour partner for the operation and maintenance of your WWTP
Making your work easier
Whenever you need us, we are there to provide you withadvice and assistance.
• Staff training: We provide training in our own training
centers or on site in wastewater treatment methods,
measuring technology handling (installation, calibration,etc.), digital fieldbus operation and much more.
• Extensive range of services: We will assist you withthe design, commissioning and operation of yourmeasuring points.
• Convenient all-round package: If you wish, we
can take care of the maintenance of your measuring
devices and ensure that your measurements are
running reliably either on site or via remote
maintenance.

Making sure your WWTP runs and runs and runs

Customized measuring cabinets and containers for all measuring activities
From time to time, situations arise in which the measuring
technology requires protection – from the rain, cold, heat,
dust or unauthorized access. In all of these cases, we canpackage complete measuring points in protective enclosures, ensuring that your measurements remain safe andavailable.
The spectrum ranges from small enclosures to walk-in
measuring containers incorporating entire workstations.
This means that you and your staff are protected from theelements while carrying out lab analyses and maintaining
the measuring technology.
If you choose a measuring cabinet or container, you will
receive a package tailored to your needs, containing
everything you require for your measuring activity and its
documentation.

Space for everything that needs protection• All of your measurements are located in one place
and are protected against heat, cold, rain, snow, dust,
unauthorized access and vandalism.
• From a small measuring cabinet to a walk-in measuringcontainer with a fully equipped lab, anything ispossible.
• Reliable operation in the field thanks to customized
measured value management, decentralized accessand a tele-alarm system.
• Optional air conditioning ensures optimum conditions
for the measuring technology, whatever the weather.
• Our project team will provide you with expert advice
throughout the entire project and will find the bestsolution for your individual circumstances.

15

"At our WWTP, the Liquiline Control controls both phosphate precipitationand nitrogen reduction. We can always rely on this control system. Evenin difficult inflow conditions, it works as specified, thus ensuring that theoutlet parameters are always adhered to."Ewald Rathmer, Plant Manager, WWTP Stadtlohn (Germany)

For everything you need to know about our sensors, analyzers and samplers:www.endress.com/Analysis
For more information on nitrogen and phosphate removal:
www.endress.com/Analytical-Solutions
Overview of our wastewater expertise:www.endress.com/Wastewater

CP01197C/07/EN/01.18

www.addresses.endress.com

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