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Sensorex Conductivity Measurement

Conductivity is an expression of the ability of a solution to conduct electric current. It is expressed as a microsiemen (micro-Siemens per centimeter or µS/cm) or in higher conductivity levels as a millisiemen. It is also the reciprocal of resistivity.

Some industries such as water treatment have adopted a measurement expressed as TDS (Total Dissolved Solids). TDS is approximated with conductivity using a multiple factor and is expressed in parts per million (ppm).

Contacting Conductivity Sensors

Contacting conductivity sensors measure conductivity with two surfaces in contact with the sample. These surfaces can be constructed of graphite, stainless steel, platinum, or similar materials. An AC voltage waveform is sent through one contact of the sensor and passes through the liquid being measured. The second contact surface receives the signal. The resulting measurement determines the conductivity of the water and is displayed on a conductivity instrument which expresses the measurement as microsiemens, millisiemens, or total dissolved solids (ppm).

Toroidal (Inductive) Conductivity Sensors

TCSP3020 and TCSP3021

PEEK Toroidal Conductivity Sensor

The Sensorex TCSP toroidal (inductive) conductivity sensors feature a wide measurement range and dependable toroidal technology over the range 0-2000 ms/cm. Resistant to corrosion, coatings and fouling common to contacting conductivity sensors, the TCSP3020 is designed for a trouble-free and long service life.

PEEK (unfilled, polyetheretherketone) is the standard material of construction and has a wide solvent tolerance and temperature stability to 130 degrees C. The TCSP Models features 3/4″ MNPT for submersion installation.

  • A PT1000 RTD temperature element is built into the sensor. All TCSP sensor models are available with 10ft or 20ft long 9-conductor cable. Custom lengths are available.
  • Choose from two output types:
  • TCSP3020: for use with EX2000RS, TCSMA, or TCSTX  transmitters
  • TCSP3021: for use with our SSRE remote electronics (models available to convert to MODBUS 485 or 4-20 mA output).


Conductivity Sensor, High Temp & Pressure Stainless Steel Contacting

The Sensorex CS675 High Temperature and Pressure Stainless Steel Contacting Conductivity Sensor is ideal for heavy duty applications. It is made from 316 Stainless Steel and PEEK. It features a single body design intended for high pressure conditions. This sensor also has 2 cell constants (0.1/cm and 1.0/cm). It features 3 options for temperature and pressure ratings ranging from standard to ultra-high (see more details in specification sheet). It also has 2 options for insertion lengths. Our most popular configurations of this product can be purchased directly from the website. ALl models listed feature Pt 1000 temperature elements. Please contact us to purchase any configurations not shown in the drop down menus below (i.e. extended cable lengths. different ATC elements, etc.).

For use with CX3000 Online Conductivity Transmitter/Controller for boiler applications or CX2000 Online Conductivity Transmitter/Controller for industrial control of conductivity and total dissolved solids (TDS).


Smart General Purpose Noryl Toroidal Conductivity Sensor

Sensorex’s ITCS3020 Smart General Purpose Noryl Toroidal Conductivity Sensor communicates directly via 4-20mA or Modbus output.  Configuration and calibration done with free web-based software. The toiroidal  design resists corrosion, coating, and fouling.

  • Noryl body provides wide solvent tolerance and is stable up to 105 C. It can measure conductivity up to 2,000,000 uS.
  • The sensor body offers both 3/4 NPT for submersion applications and a flange for installing in a flow cell (FC95C Flow Cell – sold separately).


General Purpose Noryl Toroidal Conductivity Sensor

Sensorex’s TCS3020 General Purpose Noryl Toroidal Conductivity Sensor is designed to be resistant to corrosion, coating, and fouling. Sensor measures conductivity up to 2,000,000 uS. Noryl body provides wide solvent tolerance and is stable up to 105 C. Built-in Pt1000 temperature sesnors provides temperature compensation.

  • Tinned leads ensure simple connection to transmitters or other recieving device.
  • Probe design provides 3/4 NPT thread for submersion mounting and a 2″ flange for inline installation (order FC95C Flow Cell seprately).


Contacting Conductivity Sensor, High Performance Stainless Steel

The CS700 High Performance Contacting Conductivity Sensor is ideally suited for ultrapure/pure water, drinking water, and lower-conductivity drinking water applications. It’s durable in high-temperature (150° C / 302° F) and high-pressure environments (1,379 kpa / 200 psig), thanks to stainless steel and teflon construction.

  • In addition, quick installation is made possible via using compression fitting with 3/4” or 1/2” threads.
  • Pick from three cell constants based on your application: 0.01, 0.1 (available soon) and 1.0 (available soon).


Contacting Conductivity Sensor, 12 mm, Steam Sterilizable

Sensorex CS665 is designed to withstand CIP and steam sterilization process.

It is ideal for sanitary installation with options for 1.5″ or 2″ tri-clamp connection.

  • Select from three cell constants and use temperature compensation for best performance.


Conductivity Sensor, Stainless Steel

The Sensorex CS650 Stainless Steel Conductivity Sensor is a general purpose sensor to be used in a variety of benign applications (cooling towers, dimineralizer influent, etc).

It features a robust single body design made of 316 stainless steel. It has a hexagonal body and 1/2″ NPT connection for ease of installation.


Contacting Conductivity Sensor, 12 mm Platinum

The CS200 12 mm Platinum Contacting Sensor is ideally suited for laboratory or light industrial process applications. It can be submerged in a tank or mounted inline. It is made of a rugged epoxy body, glass, and black coated platinum.

For best performance, we recommend the selection of an appropriate cell constant for your measurement range and a temperature compensation option to match your instrument.

This sensor is compatible with most portable and benchtop meters.


Graphite Contacting Conductivity Sensor, 12 mm

Used for Laboratory and Light Industrial Applications: Cells are made from graphite to provide good performance for the value. Choose from 2 cell constants: 0.1/cm and 1.0/cm. Choose from our lab and process versions:

  • Lab versions: with 3 ft (1m) cable, 10K thermistor, and 8-pin connector (for use with Sensorex CM1000 meters).
  • Process versions: with 10 ft (3m) cable, PT1000 temperature element, and tinned lead (for use with Sensorex transmitters).

The sensor can be configured to meet your exact needs. Select from our available options for a quick delivery or fill out the contact us form at the bottom for a custom product! Other cell constants, temperature compensation, cable lengths, and connectors are available. The sensor can be submerged in a tank or mount in-line in a pipe.