Conductivity Sensors for Accurate Conductivity Measurement

For high quality sensors and probes for precision conductivity measurements for all industries.

Through our partnership with Mettler Toledo’s electro chemistry division, AML Instruments is in a position to offer world leading conductivity probes and sensors at comfortable prices.

For detailed information on each sensor or probe, please click on the product listing below.

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Which Conductivity Probe Style is Right for your Business?

Below are the three different types of sensors.

2 Pole Sensor

A two pole sensor relies on two stainless steel electrodes to measure the conductivity values. The cell constant within the sensor controls the range. A popular technology that is compatible with the majority of transmitters on the market.

4 Pole Sensor

A four pole design uses two pairs of electrodes, one to drive voltage and the other to measure. The advantage of this design is a high level of accuracy over a large measurement range, contained in a small 12 mm sensor.

Inductive Sensor

An inductive sensor is physically larger and requires its own transmitter. It has embedded toroids inside the plastic body and is designed to solve the corrosion and coating issues as the metal electrodes aren’t exposed.

How Do You Select the Right Sensor?

When choosing the right sensor, understanding what application it is going to be used for is critical. Knowing the following three parameters will heavily influence the decision:

  1. What is the measurement range? Knowing this will dictate the cell constant.
  2. What is the process temperature?
  3. Chemical makeup.

What is a Cell Constant?

The cell constant is a mathematical value that is used to determine the measuring range of the sensor. This value is determined by the geometric design of the cell. It is calculated by dividing the distance (length) between the two measuring plates by the area of the plates (area of the plates is determined by the area of the outside-the area of the inside = area between the electrodes).

The raw conductivity value is then multiplied by the cell constant, which is why we see the unit µS (microsiemen)/cm.

What Do Conductivity Probes and Sensors Do?

Conductivity probes and sensors measure the ability of a solution (usually water) to conduct an electrical current. Conductivity increases with the levels of impurities in a solution, making conductivity an essential for water quality measurement and monitoring.

Leakage Detection

Several industrial processes use heat exchangers to cool process fluids and where there is cooling water to reduce the temperature of a process fluid, there is always a risk of leakage. A leak in a heat exchanger can measurably alter the concentration of the fluid on either side of the exchanger.

So, it is possible to detect a leak in real time using either a conductivity or pH sensor. Conductivity sensors require less frequent maintenance and calibration than pH sensors. 

Therefore, they are the preferred choice for leak detection in any application where they can provide a sufficient signal-to-noise ratio. 

What Makes a Solution Conductive?

There are certain Ions that need to be present to carry an electric current and those are Na – Sodium, Ca – Cholci acid, CI – chlorine, H – Hydrogen and OH – Hydroxy.

Conductivity meter or sensor can not identify what conductive material is present, so it is a quantitative measurement only. The measurement of conductivity is a quick and cheap way of identifying the ionic strength of a solution.

Get In Touch

If you require any further information on conductivity meters, sensors or buffer solutions, please get in contact.

During the regular UK working hours call 01522 789 375 or you can use the live chat in the bottom right hand corner of the website.

You could also email us on [email protected] 

Outside of those hours you can use our contact form, where we will get back to you ASAP.