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
PREVENTIVE MAINTENANCE
Maintenance checklist
Daily / each use
- Verify with a secondary standard
- Clean cuvettes
- Check the cuvette holder for dust
Monthly
- Inspect cuvettes and replace scratched ones
- Check expiry of standards
- Clean the optical compartment
Quarterly / six-monthly
- Calibrate with formazin standards (or as the manufacturer and your SOP require)
- Re-assign values to secondary standards after calibration
- Replace the lamp when its output is low
SAFETY
Safety precautions
Before you work on the Turbidity meter
- Hydrazine sulphate, used to make formazin, is toxic and a suspected carcinogen. Prepare formazin only in a fume hood with gloves and eye protection, or use ready-made stabilised standards.
- Dispose of formazin waste as hazardous chemical waste.
- Handle glass cuvettes carefully to avoid breakage.
In LimsPulse · Calibration Management
Keep every Turbidity meter in control: usage logs, calibration and maintenance schedules, and automatic blocking of overdue instruments.