LimsPulse
Physical testing

Turbidity meter

Measures how cloudy a liquid is by shining light through it and measuring the light scattered by tiny particles. Results are given in NTU or FNU and are used for clarity and opalescence tests.

  • Pharmaceutical
  • Biotech
  • Water treatment
  • Food & beverage
  • Brewing
  • Environmental testing
Illustration of Turbidity meter
Follow your site SOP
This is a typical operating sequence for learning. Your instrument model and approved SOP take precedence.
STAGE 1

Before you start

  1. 1Check the calibration status and run the daily verification with a secondary standard.
  2. 2Switch on and let the lamp warm up as the manufacturer states.
  3. 3Clean the cuvettes inside and out; check for scratches.
  • Handle cuvettes only by the top; fingerprints scatter light.
STAGE 2

Measurement

  1. 1Rinse the cuvette with the sample, then fill it to the mark.
  2. 2Cap it and wipe the outside with a lint-free cloth; apply a thin film of silicone oil if your SOP requires it to mask small scratches.
  3. 3Let air bubbles rise, or remove them by gentle inversion or a short time in an ultrasonic bath, as the method allows.
  4. 4Place the cuvette in the holder with the orientation mark aligned and close the lid.
  5. 5Record the stable reading in NTU or FNU.
  • Do not shake the sample vigorously; it creates bubbles.
  • Cold samples can fog the cuvette. Let them reach room temperature or dry the outside before reading.
STAGE 3

After use

  1. 1Empty and rinse the cuvette with purified water, then let it dry upside down.
  2. 2Store cuvettes and standards as the manufacturer directs.
  3. 3Complete the log.
In LimsPulse · Calibration Management

Keep every Turbidity meter in control: usage logs, calibration and maintenance schedules, and automatic blocking of overdue instruments.

See how