How to calibrate a conductivity meter

Written by samuel sohlden
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How to calibrate a conductivity meter
Conductivity is a standard measurement for river water pollution samples. (river water image by Tammy Mobley from Fotolia.com)

Conductivity meter calibration is essential to consistently produce accurate conductivity readings. Conductivity meters "measure the ability of an aqueous solution to carry an electric current" by "measuring the electric current between two electrodes," according to TPS. This device is essential for hydroponics and standard water pollution testing. The reading produced is indicative of nutrient level in the water sample. Nutrient excess and deficiency can then be calculated, allowing for optimal plant growth and accurate pollution results.

Skill level:
Moderate

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Things you need

  • Conductivity meter
  • Distilled water
  • Sodium chloride standard solution
  • Small plastic cup

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Instructions

  1. 1

    Prepare the sodium chloride standard solution by pouring it into a small plastic cup.

  2. 2

    Place the conductivity meter into cup holding the sodium chloride standard solution.

  3. 3

    Turn the conductivity meter on and allow it to sit in the standard solution for several minutes. Press the calibration button and adjust the value until it meets the conductivity of the standard solution. According to Flairform, this value should be 2.76mS/cm or cF27.6.

  4. 4

    Turn the calibration off and wash the probe of the conductivity meter with distilled water

  5. 5

    Use the conductivity meter as normal, recalibrating frequently to ensure accurate readings.

Tips and warnings

  • Many conductivity meters have a feature that allows for instant calibration with the push of a button, while others require adjustment after a inaccurate reading in a standard solution. Determine which type of meter you own before calibrating.
  • A conductivity meter contains batteries, which are hazardous. Keep conductivity meters away from small children and animals.

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