Wireless Conductivity Sensor Redy

Quick Answer: The Redy wireless conductivity sensor measures electrical conductivity, how readily a solution carries current through its dissolved ions, and sends readings wirelessly for logging. A wireless conductivity sensor is used for electrolyte comparisons, conductometric titrations and water-quality testing.

Ions, Current and What the Reading Means

A conductivity cell applies an alternating voltage between electrodes and measures the current that flows. Pure water conducts poorly; stir in sodium chloride and the reading climbs with every added portion, because each formula unit releases mobile ions. Results are normally expressed in microsiemens or millisiemens per centimetre, which removes the effect of the cell’s own geometry.

The same measurement separates strong electrolytes, such as hydrochloric acid, from weak ones like ethanoic acid at equal concentration, and it reveals the shape of a conductometric titration: two straight lines whose change of gradient marks the equivalence point. Barium hydroxide titrated with sulfuric acid is a favourite, as the reading falls close to zero when insoluble barium sulfate forms. A benchtop laboratory conductivity meter makes the same measurement; this sensor adds continuous logging without a cable.

Conductivity also rises noticeably with every degree of warming, so readings are often corrected to 25 °C. The title does not state the range, cell constant or temperature compensation. In titration work the wireless pH meter sensor is its natural partner.

Specifications

Applications

• Comparing strong and weak electrolytes at equal concentration
• Conductometric titrations, including barium hydroxide with sulfuric acid
• Following how quickly a salt dissolves or a precipitate forms
• Checking distilled and deionised water, or estimating dissolved solids in water samples

Care & Handling

• Rinse the cell with distilled water between samples, then with a little of the next sample.
• Make sure no air bubbles cling between the electrodes, as they lower the reading.
• Avoid touching or scratching the electrode surfaces.
• Store the sensor clean and as the maker recommends; many conductivity cells are kept dry.

Why Choose LabEquip

Chemistry teachers who want students to see ions at work, and environmental science groups testing local water, are the main buyers. This sensor is stocked in LabEquip’s chemistry lab equipment range; ranges and calibration standards can be discussed through the contact page.

Frequently Asked Questions

Why does conductivity increase when salt is added to water?

Salt dissolves into sodium and chloride ions, which drift towards the electrodes and carry charge. More ions per litre means more charge carriers and a higher reading, until the solution becomes very concentrated.

Can a conductivity sensor tell different salts apart?

Not on its own. It measures the combined ability of all dissolved ions to carry current. Different ions contribute differently, but a single reading cannot say which ones are present.

Why correct conductivity to 25 °C?

Ions move faster in warmer water, so the same solution reads higher when warm. Correcting to a reference temperature lets readings taken at different temperatures be compared.

What does a conductometric titration graph look like?

The reading changes along one straight line before equivalence and along another after it. The equivalence point is where the lines cross, and it can be found even when an indicator colour change is hard to see.

How is the sensor calibrated?

Place it in a potassium chloride standard of known conductivity at a known temperature, enter the value in the software, and check it with a second standard if one is available.

Can it measure conductivity in distilled water?

Very low readings are expected. Check that the lowest range suits such samples, and avoid contamination from the beaker or your fingers, which can raise the result noticeably.

Last Updated: September 2026