Conductivity meter: types, prices, characteristics, uses …

November 2, 2021

conductivity meter or conductimeter fulfills the function of measuring the amount of electrical current or conductance in a solution. For example, the conductimeter  is the instrument used in order to know the conductivity (electrical charge) in a body of water of natural origin. It is for this reason that a conductivity meter is also used in water treatment plants. Conductivity meters are very common in any water treatment or monitoring procedure, as well as in environmental laboratories.

What is conductivity?

When we talk about conductivity we refer to the electric current that we find in a solution and this is a value that basically depends on the ionic strength of the liquid. The ionic strength is directly proportional to the amount of ions that are present, depending on the concentration of the substance and in what form it is, whether it is liquid or solid. Taking this into account, we will know the oxidation state that these ions have. To make it clearer, each ion has a negative or positive charge, the cations are positive, and the anions are negative. In a naturally occurring source or body of water, it is the ions that contribute to the high conductivity. As a result of salts and minerals dissolved in the water.

How does a conductivity meter or conductivity meter work ?

The conductivity meter is equipped with a probe, generally this probe is handheld, for field measurements. After immersing the probe in the liquid to be measured, the meter applies voltage between two electrodes inside the probe. The meter reads the voltage drop of the solution, which is caused by electrical resistance. The conductivity meter or conductimeter  converts the reading to milli or  micromhos  or milli or  microSiemens per centimeter. The value indicated represents the total dissolved solids. This amount of solids is what fiberglass can pass through.

Meter and temperature – How does it read?

The conductivity meter generally   has no relationship in its temperature readings to the actual ambient temperature. This is due to ionic strength. But since the conductance depends on the actual temperature, many times the reading tends to be inaccurate. It is for that reason, many conductivity meters also have a specific conductance measurement . When in specific conductance mode, the meter reads the conductivity of the solution at 25 degrees Celsius, not the actual temperature. This results in a more standardized reading.

Salinity and total dissolved solids

Salinity is the amount of salts dissolved in a solution. Conductivity meters or conductivity meters equipped with a salinity option internally convert the conductivity reading to a salinity reading. Freshwater bodies must have a much lower salinity concentration than ocean water, which is estimated to be between 20 and 30 parts per trillion. Total dissolved solids can be determined by multiplying the conductivity measured in microSeimens  by a factor of 0.67.

Calibration

Calibration leads to a more accurate reading. Calibrating the meter is a very easy task, all you have to do is follow the instructions that the conductivity meter brings. In general, the steps are very simple and anyone can follow them without problems. In addition, the conductivity meter  usually has a menu item that will allow you to enter the calibration mode. In some cases, multiple standards are required.

What conductivity meter to choose?

Those professionals or industries looking to purchase a conductivity meter should do some research before deciding on one in particular. Taking into account the physical location where the conductivity meter needs to be used is extremely important. Next, it is vital to determine the type or types of liquid materials to be subjected to conductivity.

For example, if the test or study work is done in a laboratory, a benchtop conductivity meter would be the one. But within this category, we find devices that are more solid and others that are portable. In addition, each model has similar specifications and different ones. Therefore conducting an investigation is extremely interesting.

On the other hand, if what is needed is to go out to study outdoors. For example, controlling the water quality in rivers and streams, controlling aquariums, or perhaps in groundwater. The ideal in these cases is to choose a handheld conductivity meter. These types of conductivity meters are portable and very simple to use. They are the ideal instrument for field work.

4 Different types of conductivity meters

Monitor P460

The PH Monitor P460 -TW controller is an inexpensive instrument, which is installed and tested on site as required. This is due to the easy installation of the device. It can be used to test the pH value of solutions in all industries. Oil, chemical, electrical, pharmaceutical, among others.

Features
● 3-1 / 2 LED digital display
● Auto buffer adjustment ● Factory
setting restore function is available
● DC24V, two-wire controller
● 4-20mA output with DC24V

Dissolved oxygen monitor 

The industrial dissolved oxygen controller is a precision instrument, with multi-parameter display, automatic temperature compensation, manual pressure and salinity compensation, compatible polarographic sensor measurement. It has fast response, high precision and better stability. It is especially suitable for detecting the oxygen content of boiler feed water, condensed water, waste water and other industries.

Features
● Large backlit multi-function LCD display
● Wall or panel mounting available
● Human-machine interface is friendly
● Measured process Dissolved oxygen, temperature
● 0 ~ 100 ℃ automatic / manual temperature compensation
● Manual or automatic buffer adjustment
● Restore the Factory setting function is available
● ROM inside, measurements and time can be programmed stored
● Galvanic separation between inputs and outputs and supply voltage
● Programmable high and low alarm, 250V / 10A relay output

CL800 chlorine monitor

Overview
The CL800 Chlorine Controller is used in many applications that require measurement of residual chlorine concentration for chlorine monitoring or residual chlorine dosing control.The unit uses a multi-function LCD screen to display readings and provide feedback to the user. It is available with different options to provide fully configurable control, alarm, and feedback with up to four relays and two 4-20 mA current output sources. This water analyzer could work for residual chlorine measurement in the field of water monitor, flexibility, reliability and low maintenance, designed to meet the demanding requirements of residual chlorine measurement in modern environment, contains many features to ensure the better precision whatever the application.

Features
● Large backlit multi-function LCD display
● Wall or panel mounting is available
● Human-machine interface is friendly
● Measured process Free chlorine, pH, temperature
● CL-PH compensation mode
● Manual or automatic buffer adjustment
● Function Factory reset is available
● ROM inside, measurements and time can be programmed to store
● Galvanic separation between inputs and outputs and supply voltage
● Programmable high and low alarm, 250V / 10A relay output

Gas Driver

The smart gas transmitter adopts the most advanced technology, international standard smart technology, analog and digital mixed communication. It has the characters of excellent function, high stability, the function of communication and self-diagnosis, easy installation and maintenance, fully displays the advanced performance of the typical intelligent monitoring instrument, greatly meets the requirements of industrial security monitoring equipment having high reliability, and widely used in petroleum, chemical, metallurgy, refining, biological medicine, etc.

Features
● Smart digital gas transmitter
● 4-20 mA output and RS485 signal, and real-time communication with computer
● Supports plug and play smart sensor
● Special backlit LCD display
● Compensated digital temperature range

Dr. Loony Davis5
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Born and raised in Brussels in an English family, I have always lived in a multicultural environment. After several work experiences in marketing and communication, I came to Smart Water Magazine, which I describe as the most exciting challenge of my career.
I am a person with great restlessness and curiosity to learn, discover what I do not know, as well as reinvent myself daily, someone who is curious about life and wants to know. I enjoy sharing knowledge.
This is my personal project but I also collaborate in other blogs, it is the case, the most important web on water currently exists in the US, if you are interested you can read my articles here.

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