PH / Conductivity

Acidity and conductivity are two of the most measured parameters. From simply checking the quality of a fishpond to testing medicine, foodstuff or the composition of paint; Both parameters are these days the basics of Quality control.

pH
pH is the abbreviation of Hydrogen potential in an aqueous solution. The pH scale for pH measurement runs practically from 0 to 14. Pure water ...
Acidity and conductivity are two of the most measured parameters. From simply checking the quality of a fishpond to testing medicine, foodstuff or the composition of paint; Both parameters are these days the basics of Quality control.

pH
pH is the abbreviation of Hydrogen potential in an aqueous solution. The pH scale for pH measurement runs practically from 0 to 14. Pure water has a pH value of 7. Everything lower is acidic and all higher values are basic. The acidity is caused by the detaching of a Hydrogen ion (H+) from its salt. Basicicity is caused by the detaching of a hydrogen oxide ion (OH-) from its salt. The pH-value is a measure of the dissolved and active amount of either H+ or OH- ions. It doesn’t directly relate to the concentration of the acid. Inhibitors and other compounds can severely influence the correlation between pH-value and acid or base concentration.

pH measurements
To measure pH there are many possibilities, from a simple pH- indicator to elaborate electrode systems. The most commonly used pH- electrode is the Glass calomel electrode since 1906. This type of electrode has proven its stability and reliability over many years. The electrode is most reliable between -1 and 12. For higher basicicity other electrodes should be used. A pH-electrode is basically an ion-selective electrode reacting to the H+ ion. This electrode is also sensitive to several other interferences. The matrix of a sample influences the reliability of an electrode. Glass is also sensitive to the presence of Fluoride ion in a solution. This affects the stability of the glass membrane in the electrode. Also fine pigments can cause the membrane to get blocked. For measuring in paint ISO is now working on the acceptance of ISFET electrodes for measuring the pH-value in paint products.

Conductivity
Where pH is an ion selective method, conductivity is a non-selective method. Any salt that dissolves into water and forms an electrolyte will result in an increase in conductivity of that sample. This conductivity is measured in technically the same way that conductivity is measured in an electric wire. The more dissolved salt a solution contains the better it conducts electricity. Conductivity measurement can be influenced by a few parameters. One of these is static electricity that is caused by measuring in small volumes.
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Benchtop conductivity meter CON 700

The CON 700 offers years of reliable, accurate and consistent performance. User-friendly features make the instrument an ideal research partner in laboratories, productions plants and schools. Features: - Large screen that displa...

Benchtop pH meter PH 700

Economical, user-friendly and accurate, the Eutech pH 700 is your ideal choice for routine applications in laboratories, productions plants and schools. - Large, easy-to-read display - Ready indicator let you know when readings are...

CALIBRATION AND MAINTENANCE SOLUTION

TQC Calibration and Maintenance Solutions are essential for calibrating and maintaining the pH and/or conductivity gauge. A wide range of liquid measuring systems is available, in addition to acidity (pH), conductivity (S) and tempe...

COMBOTESTER PH EC TDS TEMPERATURE

This Combo waterproof tester offer high accuracy pH, EC/TDS and temperature measurements in a single tester! No more switching between meters for your routine measurements. The waterproof Combo (it even floats) has a large easy-to-r...

CONDUCTIVITY GAUGE ECOSCAN COND 6PLUS KIT

Powerful portable conductivity gauge with large measuring range. Equipped with Cond 6+ Conductivity Meter, electrode & Conductivity Carrying Kit (Includes 1 x 1413 uS, 12.88 mS, 84 uS KCl Standard Solution and 1x Deionised (Rins...

CONDUCTIVITY METER

The TQC Conductivity Meter now measures a wider conductivity range from pure water to waste water and and comes with simultaneous temperature display, auto-ranging capabilities. Signature designs such as automatic temperature compen...

DIGITAL RESISTIVITY METER FOR COATINGS

Digital instrument for the measurement of surface resistivity of coatings which are sprayed electrostatically. The probe is immersed in the coating and the measured value is displayed on screen. The probe is easy to clean. Measurin...

PALMTOP SALINITY METER ECOSCAN SALT 6

EcoScan Salt 6 for quick, accurate salinity measurements in laboratories, field and schools. The instrument has a lot of unique features like push-button Calibration with ±1% full scale accuracy, Automatic Temperature Compens...

PH CONDUCTIVITY-METER CYBERSCAN PC10

Extremely handy gauge for determining pH (acidity), conductivity and temperature of liquids. The different probes are combined in a waterproof casing. Large display shows various parameters simultaneously.Kit contains:Waterproof Cyb...

PH INDICATOR PAPER UNIVERSAL - PH 1-14

Indicator paper on a roll for acid and base (alkaline) test. - fast response time within a minute - easy to read, accurate color charts - high contrast for easy color chart comparisons

pH meter pHTestr30 waterproof

Ideal for quick and accurate pH checks in pools and spas, aquariums and hydroponics operations, or anywhere frequent pH testing is required. pHTestr 30 meets requirements for many standard environmental and ASTM test methods....

PH-METER PH 5PLUS

Easy to use, robust pH meter. Equipped with pH 5+ pH Meter with Single Junction pH Electrode, ATC Electrode & pH Carrying Kit Set (Includes 1 x pH 4.01, pH 7.00 Buffer Solutions, Storage Solution & 1 x Deionised (Rinse) Wate...

PH-METER PH TESTR 10 (WATERPROOF)

Easy-to-use, fully waterproof, pH meter with large display. Floats. The modular design makes it extremely easy to change electrodes. The PH meter is equipped with automatic calibration with buffer recognition. The accuracy of the me...

RESISTIVITY GAUGE FOR COATINGS

Simple instrument for measuring the surface resistivity of electrostatically sprayed coatings. The probe is easy to clean and is immersed in the coating. The measured value is recorded on an analogue scale.