Go to homepage
Menu

Shortcuts

media portal Editorial use

Tags

SE656 Ex Sensor Conductivity SE655

Latest Posts

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

Nov 2021 Process Analytics SE656 Ex Sensor Conductivity SE655
media portal Editorial use

The chemical, pulp and paper, and industrial wastewater monitoring industries place exacting demands on the sensors they use in their production processes. These sensors need to be failsafe and resistant to contamination, and they must be able to withstand high pressures and temperatures. At the same time, users are increasingly demanding digital data transmission to ensure continuous product quality monitoring. The SE655X digital and SE656X digital toroidal conductivity sensors from Knick fulfill this brief perfectly. 

The Memosens protocol enables integrated sensor diagnostics and storage of the sensor characteristics; it also records wear data to facilitate predictive maintenance. The SE655X digital is made of the process-wetted material PEEK, while the SE656X digital uses PFA, providing extremely high resistance to aggressive materials. With a range of 0 to 2,000 mS/cm and an available process temperature range of -20 °C to110 °C, the sensors can be used in a wide range of scenarios. They are ATEX and IECEx certified for use in hazardous locations.

A Quick and Easy Switch from Analog to Digital Measurement

The two sensors complete the Knick SE655 and SE656 product lines, and the company now offers full sensor solutions from a single source. Customers who do not wish to change their sensor types can switch over from analog to digital measurement technology with the digital versions of the SE655X and SE656X. The sensors work with Knick transmitters such as Protos, Stratos, and MemoRail, and, with their ability to store sensor characteristics, are easy to handle and install. After connecting to a transmitter, the “plug & measure” sensors are ready for use.

Latest Posts

Local expertise for process analytics directly on site
Oct 2025
Company | Process Analytics
Functionally safe measurement of high voltages in industrial applications
Sept 2025
Interface Technology
  P45000, Functional Safety
Upgrading Rail Infrastructure with Knick HV-Transducers and Dewesoft DAQ Systems
Sept 2025
Interface Technology
  Railway
P45000 SIL 2 / SIL 3: Voltage measurements in applications with functional safety
Jun 2025
Interface Technology
  Hydrogen, SIL, Energy
SE605H Conductivity Sensor with CondCheck
Mar 2025
Process Analytics
  Pharma, Sensor, Conductivity

Related Posts

SE605H conductivity sensor with CondCheck: Integrated sockets for connecting a resistance decade

Mar 2025

Process Analytics

Pharma, Sensor, Conductivity

SE605H Conductivity Sensor with CondCheck
The SE605H conductivity sensor with CondCheck enables USP 645 verification without interrupting the measuring chain.
Optical probe from Hellma and retractable fittings from Knick

Jul 2024

Process Analytics

Achema, Fitting

Hellma Spectroscopy Probes and Knick Retractable Fittings
A strong team for more efficiency and safety in production and manufacturing processes with spectroscopy analytics
Knick’s large, international team at its ACHEMA 2024 trade fair booth.

Jul 2024

Process Analytics

Achema

ACHEMA 2024 - Review and Impressions
A brief cinematic retrospective of our trade fair booth, Knick’s international team, and a successful booth party.

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.

Apr 2023

Process Analytics

Fitting, Launch, 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

Fitting, Launch, 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

Sensor, Conductivity, 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

Sensor, pH, 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

Sensor, Conductivity, 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

Sensor, Conductivity, Launch, 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

Fitting, Launch, 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

Sensor, Fitting

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.

Feb 2017

Process Analytics

Conductivity

High-Precision Conductivity Measurement at Extreme Temperature Differences
Pharmaceutical manufacturer, EVER Pharma Jena uses the extremely robust conductivity sensors SE605(H) and SE680 with Memosens technology from Knick.

Nov 2016

Process Analytics

Transmitter, FF, Profibus, HART

The Big Three of the Process Industry: HART, FF, Profibus
Our Knick multi-parameter analyzers are now available with Profibus and FF interfaces. Even for hazardous areas.