Turbidity is one of the most important parameters used to determine the quality of drinking water. Once considered as a mostly aesthetic characteristic of drinking water, significant evidence exists that controlling turbidity is a competent safeguard against pathogens. In natural water, turbidity measurements are taken to gauge general water quality and its compatibility in applications involving aquatic organisms. The monitoring and treatment or wastewater was once solely based on the control of turbidity. Currently, the measurement of turbidity at the end of the wastewater treatment process is necessary to verify that the values are within regulatory standards.

 

Turbidity of water is an optical property that causes light to be scattered and absorbed, rather than transmitted. The scattering of light that passes through a liquid is primarily caused by the suspended solids present. The higher the turbidity, the greater the amount of scattered light. Even a very pure liquid will scatter light to a certain degree, as no solution will have zero turbidity.

 

Drinking water treatment plants that obtain water from surface water are required by the EPA to monitor and report the turbidity. Surface water sources include lakes and rivers. The requirements of the nephelometer and reporting measurements according to EPA Method 180.1 are:

• The applicable range is 0-40 nephelometric turbidity units (NTU)
• Light source: Tungsten lamp operated at a color temperature between 2200-3000°K.
• Distance traversed by incident light and scattered light within the sample tube: Total not to exceed 10 cm.
• Detector: Centered at 90° to the incident light path and not to exceed ±30° from 90°. The detector, and filter system if used, shall have a spectral peak response between 400 nm and 600 nm.
• The sensitivity of the instrument should permit detection of a turbidity difference of 0.02 NTU or less in waters having turbidities less than 1 unit.
• The HI98703 meets and exceeds the meter criteria specied by the EPA Method 180.1 and Standard Methods for the Examination of Water and Wastewater 2130 B.

SKU: H198703-02

Product Name: Turbidity (EPA) Portable Meter – HI98703

Quote Required: Yes

Turbidity Range: 0.00 to 9.99; 10.0 to 99.9; 100 to 1000 NTU

Turbidity Resolution: 0.01; 0.1; 1 NTU

Turbidity Accuracy: ±2% of reading plus 0.02 NTU

Turbidity Repeatability: ±1% of reading or 0.02 NTU, whichever is greater

Turbidity Stray Light: < 0.02 NTU

Turbidity Calibration: two, three, or four-point calibration

Turbidity Measuring Method: ratio nephelometric method (90° & 180°). Adaptation of the USEPA Method 180.1 and Standard Method 2130 B

Turbidity Measuring Modes: normal, average, continuous

Turbidity Light Source: tungsten filament lamp

Turbidity Light Detector: silicon photocell

Logging Memory: 200 records

Connectivity: USB or RS232

Automatic Shut-Off: auto-off after 15 minutes of non-use

Display: 60 x 90 mm backlit LCD

Battery Type/Life: 4 (1.5V) AA alkaline batteries

Power Supply: 4 (1.5V) AA alkaline batteries or AC adapter

Environment: 0 to 50°C (32 to 122°F), RH max 95% non-condensing

Dimensions: 224 x 87 x 77 mm (8.8 x 3.4x 3.0″)

Weight: 512 g (18 oz.)

Ordering Information: HI98703 is supplied with sample cuvettes and caps (5), HI98703-11 calibration cuvettes, silicone oil, cuvette wiping cloth, batteries, AC adapter, instruction manual, and rugged carrying case.