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Turb® 550

WTW Turb® 550 Lab turbidity meter

Turbidity meters for all nephelometric measurements in the lab and in drinking water analytics of 0.01 - 1000 NTU according to DIN ISO 27027 / US EPA 180.1

  • Highly precise AMCO Clear® standards
  • AQA
  • Flow-through measurement

The lab turbidity meters of the Turb® 550 series with IR lamp as per DIN ISO or Tungsten-halogen lamp as per US EPA for nephelometric measurements with automatic 1-3 point calibration and calibration interval monitoring with protocol for the AQS. User guidance and quick instructions on the meter ensure user-friendly measurements and calibration. The calibration is conducted with highly precise AMCO Clear® polymer standards, called a secondary standard for drinking water as per DIN ISO 27027, EN ISO 7027 or approved as primary standards as per US EPA (0.02 – 10.0 – 1000 NTU). The analytical quality assurance (AQA) takes place via an adjustable calibration interval and a calibration protocol.

AMCO Clear® Standards

Compared to Formazine, polymer calibration standards offer a much higher accuracy and stability without drifting, which increases the measuring accuracy even more:

  • Manufacturing tolerance of only ±1% for highest result accuracy
  • Long-term stable particle distribution and size
  • No health hazard
  • Easy to dispose of
  • N.I.S.T. traceability

For continuous measurements, there is an attachment for flow-through available. The measurement data can be sent to a PC or a printer timer-controlled via the RS232 interface.


Model Description Order no.
Turb® 550 IR Turbidity meter with infrared LED: nephelometric according to DIN ISO with ACMO Clear® Calibration standards 600110
Turb® 550 Turbidity meter with tungsten lamp: nephelometric according to US EPA 180.1 with ACMO Clear® Calibration standards 600100

Technical Data

Measuring ranges NTU 0 … 1000 / 0-1000
FNU 0 … 1000 (IR)
Resolution (NTU) 0.01 for range 0.00 … 9.99
0.1 for the range 10 … 99.90
1 for range 100 … 1000
Accuracy (NTU) ± 0.01 NTU or ± 2% of measured value
Reproducibility 0.01 NTU or ±1% of measured value
Cuvette size 28x70 mm, 25 ml sample volume
Power supply Power cable 100-240 VAC ±10%

Matching and supplemental products


Model Description Order no.
Cal.Kit P Turb®550 IR/T Calibration set for Turb® 550 IR/T (0.02-10-1000 NTU) incl. marking rings 600542
Cell Turb/SET Empty cuvette set 3 ea. for Turb® 550/555 devices 600601
D-Turb Flow vessel for Turb® 550/555 devices, pressure-free 600600
Lamp Turb® 550-IR Preadjusted replacement lamp IR for Turb® 550 IR 600607
Lamp Turb® 550/555-WL Preadjusted replacement lamp tungsten-halogen for Turb 550 and Turb 555 (white light/T) 600603


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