Conductivity measurement

Conductivity measurement of an aqueous solution is a method used to determine amount of nutrients, salts and impurities. Conductivity standards are crucial to calibrate your conductivity meter. Depending on you measurement range, different standards are available. You can buy them in bottles or practical sachets to ensure a 'fresh' solution every time you calibrate.

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Conductivity standards in practical sachets

New conductivity standards in sachets for analyzing samples or calibrating conductivity cells.

Conductivity standards in bottles

A very large range with different concentrations from 15 to 100 000 microSiemens/cm for analysing samples or calibrating conductivity cells. Produced by a supplier following ISO 17025 and Guide 34

FAQ

There is nothing to mix or measure: Just take and open one sachet and your fresh solution is 'ready to use'. Our sachets are perfect for the field and lab since no extra glassware or measuring devices are needed, and nothing needs to be washed. These single-dose sachets ensure that you have just the right amount of solution every time, preventing cross-contamination of your samples.

  • Pocket size
  • Freshness sealed
  • Reliable, easy to use and accurate
  • Traceability to NIST
  • Batch-specific Certificates of Analysis included in each pack showing
  • Measurement uncertainty
  • pH values at various T°
  • Expiry dates
  • Traceability to NIST

It depends on the solution you are measuring. The effect of temperature is greatest in low conductivity (or low ionic strength) solutions. In most cases, there will be a 2% increase per °C for most aqueous solutions. However, organics have very different temperature curves.

Salts, minerals and dissolved gases contribute to conductivity, meaning conductivity indicates the amount of dissolved materials in a solution. TDS can give you a fairly accurate measurement when comparing the status of a single source (such as NaCl). Yet when comparing two different types of solutions it may be error-prone. Calibrate the meter using the same dissolved materials that are in the test solution.

The probe is the same for both, but a salinity meter has a correction factor applied to the reading. The correction factor takes the conductivity reading and converts it to ppm of a specific salt (which varies by manufacturer).

No. The cell constant may be different and pin configurations are typically different. The type of thermistor used for temperature compensation is also different.

Use a standard solution in the range of samples you are testing to calibrate the probe. Place the probe in the standard solution, condition and rinse the probe in a second sample of the standard solution. Then use a third sample of standard solution to calibrate and adjust the cell constant until the specified value is displayed. Recalibrate when you change ranges, or if readings seem inaccurate.

Literature