PROCESS ANALYTICS

Monitoring raw water inlet

Monitoring Raw Water Inlet for Drinking Water Treatment

Quality control is essential for the raw water used in the treatment of drinking water.

Yet many municipalities often do not have generous budgets for drinking water treatment. This is why system operators are faced with the challenge of implementing safe processes for the production of clean water while adhering to rigorous cost calculations.

Online measurement of pH value and oxidation-reduction potential (ORP) enables drinking water treatment plant operators to assess the quality of the raw water they use and implement measures to protect the system.

Food and Beverage

Water and Wastewater

Importance of pH and ORP Measurement in the Treatment of Drinking Water

Before the raw water from lakes, rivers or wells can be fed into supply lines as drinking water, a variety of analyses and filtration processes ensure its harmlessness. Although the concentrations of certain germs and pollutants can only be documented in continuously implemented, complex offline analysis procedures, online pH and ORP measurement of incoming raw water provides technicians with important information about the water quality and the steps that must be taken, if any.

Recording raw water values plays a key role in the overall process of drinking water treatment. Measures for neutralizing extreme pH values or oxidation-reduction potentials are not only taken in the spirit of health compatibility, but also to protect treatment plants and filters against premature wear. Acidic water is not just unhealthy, it corrodes water lines as well. On the other hand, ORP describes the concentration ratio of reduced and oxidized substances in the water. These include nitrate, sulfate, and manganese oxide. A low ORP also means that the risk of microbial contamination is considerably high. To raise ORP and thereby disrupt germ cell metabolism, oxidant chemicals such as chlorine are added to the water. Their dosing is based on ORP measurement, and the values must be recorded reliably to avoid under- and overdosing. Underdosing would not thoroughly kill the germs. Overdosing would accelerate system component wear, necessitating extra treatment steps to reduce chlorine concentration to maintain health safety compatibility and lead to excessive, inefficient chemical consumption.

Sensor Contamination in Online Monitoring: Reducing the Risk of Blocked Junctions

As a rule, groundwater features a low level of contamination but depending on the regional circumstances, raw water can also contain surface water and the precipitation that collects in wastewater channels. To avoid abbreviated service lives and maintenance intervals, which would require frequent process interruption, the pH and ORP sensors used for online raw water measurement must be resistant to high levels of contamination. They must also be designed such that junction blockage is avoided, even at high levels of impurity.

The SE554 Memosens sensor was developed for pH measurement in contaminated, alkaline or acidic media. As a particularly economical solution, SE554 is also available in a version for simultaneous pH and ORP measurement with platinum electrodes. Two open junctions reduce the risk of blockage or contamination to a minimum.

Measurement interference that may arise as a result of diffusion potential at the junction is reduced by a high level of potassium chloride and its special distribution in the polymer of the reference electrode. Due to their high stability and accuracy and very low maintenance requirements (it is not necessary to refill electrolyte), using SE554 sensors contributes to a significant reduction in total operating costs.

The SE564 ORP sensor was also designed for use in highly contaminated media in which deposits tend to form. As is the case with SE554, the modern temperature- and pressure-resistant polymer electrolyte in the SE564 ensures long-term stable measurement and eliminates the need to use conventional ceramic junctions. Instead, a double open junction establishes contact between the reference system and process medium, reliably preventing blockage in the measurement of wastewater containing solid impurities.

Memosens Enables Quick Sensor Replacement and Easy On-Site Troubleshooting

Sensor exchange within minutes, using pre-calibrated Memosens replacement sensors, is also possible under harsh ambient conditions. After they are connected, the replacement sensors automatically transfer the calibration and sensor data saved in their electronics to the transmitter and measurement can continue without significant interruption.

If there are measuring point problems, the mobile process analyzers in the Portavo series enable quick and easy sensor diagnostics on site. Often, simple problems can be solved by cleaning the sensor or recalibrating it with Portavo. In many cases, this solution avoids prophylactic sensor replacement and subsequent troubleshooting in the laboratory.

Reliable Measured Value Transmission in Wet Environments

Due to the inductive transmission of sensor values and supply voltage in connectors, using Memosens sensors prevents interference with measured value transmission in wet environments as well. Even with sensor cables that are up to 100 m long, the measured values are accurately transmitted because they are digitized and not subject to the attenuation that affects analog signals. As a result, transmitters can be installed in protected environments far from the measuring point.

Return on Investment

The design features of the SE554 and SE564 pH or ORP sensors ensure long service lives – even in highly contaminated media. As a result of minimized maintenance effort and extended replacement cycles, using Memosens sensors lowers measuring point costs.
Quick sensor replacement with pre-calibrated Memosens sensors reduces downtime and avoids complicated on-site calibration, reliably preventing measured value distortion and subsequent errors.
The Portavo 908 Multi mobile analyzer enables calibration and sensor data to be easily recorded at remote measuring points.

Matching Products

SE554 pH Sensor | Memosens | 120 mm | Ex | For very high ionic strength media

Product number:

SE554X/1-NMSN

SE564 ORP Sensor | Memosens | 120 mm | Ex | For highly contaminated media with pressure fluctuations

Product number:

SE564X/1-NMSN

Portavo 908 MULTI Portable Multiparameter Transmitter | Memosens Sensors | Data Logger | GLP Compliance | Direct Printer Control

Product number:

908MULTI

Related Industries and Applications

Food and Beverage

Reliable measurements from raw material to end product under the extreme requirements due to SIP/CIP, temperature and safety.

Water and Wastewater

Complete and easy-to-use measurement solutions from a single source for the treatment of process and waste water.

Brewery processes

The taste and quality of beer greatly depend on the quality of the water used to brew it. pH and conductivity measurements determine its quality. Globalization is putting massive competitive pressure…

Monitoring sugar production

pH sensors are subject to extreme requirements during sugar production. Lime is dosed based on pH measurement right from the start...

Quality control for raw milk delivery

High quality requirements are placed on raw milk, and online monitoring of truck unloading procedure at the dairy prevents inferior quality (sour milk) from spoiling the entire stock of the storage tank.

Industrial wastewater treatment

Depending on the sector, industrial wastewater is polluted by heavy metals, grease, oil, alkaline substances or, as in the paper and soap sectors, organic substances that can only be neutralized or separated with great effort.

Flue gas cleaning sludge incineration

Biological wastewater treatment plants produce toxic sludge that must undergo a phosphorous recovery process. The hazardous gases released during ...

Blog Articles on this Subject

Feb 2024

Process Analytics

Uniclean700, Launch

Uniclean 700 Series - Modular control system for automated sensor cleaning

With the Uniclean 700 series, Knick is introducing a modular control system, that can be installed very quickly and cost-effectively as a flexible entry-level solution for automated sensor cleaning.

Dec 2023

Company

|

Interface Technology

|

Process Analytics

Knick Austria - direct customer contact in Austria from 2024

Reorganization of sales in Austria and new contacts in the field of process analytics and interface technology

Apr 2023

Process Analytics

Launch, Fitting, WA111

Robust WA111 Retractable Fitting Made of Plastic for Highly Corrosive Operating Conditions

The plastic WA111 retractable fitting is a robust and cost-effective solution for corrosive processes and environments. It is equipped with a secure lock function and multiple nozzles for thorough sensor cleaning.

Apr 2023

Process Analytics

Launch, Fitting, WA155

Successful joint project : Knick developed the special Ceramat WA 155 retractable fitting for optical probes from SOPAT

In cooperation with SOPAT, Knick developed a special Ceramat fitting for optical probes for automatic cleaning in fouling processes.

Apr 2023

Process Analytics

Conductivity, Phamacy, pH

pH and conductivity measurement in vaccine production

Pharmaceutical contract manufacturer relies on Knick's transmitters for modular production plants for Covid-19 vaccines.

Apr 2023

Process Analytics

Conductivity, Sensor, SE625

Sturdy 2-Electrodes Conductivity Sensor SE625 with Coaxial Electrodes made of Titanium

The SE625 ensures reliable and accurate determination of the conductivity of ultrapure water in the semiconductor industry.

Jan 2023

Process Analytics

ARD75

Sensor Adapter with Lock Function Enables Safe and Thorough Cleaning

Sensor adapter with locking gate for safety and thorough cleaning of sensors in the immersion fitting ARD75 without the need

Nov 2022

Process Analytics

Protos II 4400, Module

Up to six Sensors on one Transmitter Protos II 4400 via Modul MSU4400-180

Users can now connect up to six Memosens sensors simultaneously.

Aug 2022

Process Analytics

Achema, Exhibition

ACHEMA 2022 - Knick at the world forum for the process industry

In August 2022, the international process industry met at the ACHEMA. Knick presented the cCare system and industrial applications in a new concept.

Jun 2022

Process Analytics

pH, Sensor, SE555, ORP

Combined pH- and ORP-Sensor SE555X/*-AMSN

Combined pH and ORP measurement in one sensor SE555 saves place and equipment costs for demanding requirements in the chemical industry, the food sector and for hygienic applications.

Apr 2022

Process Analytics

MemoTrans

Ultra Compact Transmitter for Memosens Sensors

The new ultra compact MemoTrans MT201 transmitter plugs directly onto the Memosens sensor in the fitting and communicates via 4-20 mA HART protocol.

Feb 2022

Process Analytics

Protos II 4400, Stratos Multi, Software, ProgaLog

Conveniently configure transmitters offline on a PC - ProgaLog 4000

Conveniently configure all flexibly configurable Stratos Multi and Protos II 4400 transmitters offline, save settings, duplicate for further transmitters, and create documentation for audits.

Feb 2022

Process Analytics

Stratos Multi, Transmitter

New Stratos Multi E461N transmitter with Profinet

The interface enables continuous communication of process variables and predictive maintenance from the field level to all common process control systems.

Jan 2022

Process Analytics

Memosens

Memosens 2.0: Evolution of digital data transfer

As one of the two initiators of Memosens, Knick is constantly developing the technology.

Nov 2021

Process Analytics

Conductivity, Sensor, Ex, SE656, SE655

SE655X Digital and SE656X Digital - Digital Conductivity Sensors with Ex Certification

The SE655X digital and SE656X digital conductivity sensors with Memosens protocol are now also available with Ex certification.

Nov 2021

Process Analytics

Exhibition, Switzerland, Ilmac

ILMAC 2021 in Basel - Trade Show Review by Knick Schweiz AG

Knick Schweiz AG exhibited at ILMAC in Basel and gives a brief review of what it's like to have finally met customers at the show again.

Oct 2021

Process Analytics

Stratos Multi, Transmitter, Ex

Stratos Multi E401X- Multiparameter Transmitter for Hazardous Locations

The new Multiparameter Transmitter Stratos Multi E401X can now also be used in hazardous locations, installed in Ex Zone 2.

May 2021

Process Analytics

Transmitters, Stratos Multi

Stratos Multi E471 with EtherNet/IP for process optimization

EtherNet/IP communication protocol allows the transmitter to be easily integrated into Industrial Ethernet networks as PCS.

May 2021

Process Analytics

Launch, Conductivity, Sensor, SE656

New SE656N digital conductivity sensor

New toroidal Digital Conductivity Sensor with a large measuring range and consisting of PFA for using in aggressive media

Mar 2021

Process Analytics

Protos II 4400, Profinet

Transmitter for the process industry with PROFINET module

The PROFINET industrial Ethernet standard is becoming an increasingly important aspect of process engineering in the “Industry 4.0” environment.

Jul 2020

Process Analytics

Launch, Fitting, ARD170

High-quality immersion fitting for mobile applications

ARD 170 enables measurements even in deep water

Jul 2020

Process Analytics

Fitting, ARD50, ARD75

Modular immersion fitting as an electrically conductive variant

Knick is expanding its portfolio of fittings for liquid analysis with additional electrically conductive (EL) variants.

Apr 2020

Process Analytics

Launch, Transmitters, Stratos Multi

New multiparameter transmitter Stratos Multi

Knick is launching the the next generation in its Stratos analyzer product line.

Feb 2018

Process Analytics

Fitting, Sensor

How to get the sensor into the process

Sensors as the direct interface to the process must be exactly matched to the chemistry of the measured medium and to the prevailing pressure and temperature conditions.

Apr 2017

Process Analytics

MemoRail Modbus

Powerful compact analyzer boosts performance while reducing costs

It has long been common practice when taking pH/ORP, conductivity, and oxygen measurements that a fixed analyzer be mounted near the sensor. The analyzer serves several purposes.