Turbidity is equal to the reduction of the transparency of a liquid due to the presence of particles in suspension. It can be measured by passing a beam of light through the sample. Turbidity is determined by measuring the light that is duffused by the particles in suspension.
The American standard is referred to as the USEPA method and recommeds using a visible light source. The European standard subscribes to the Infrared method which has the advantage of being less senstitive to the colour of the samples. HANNA Instruments turbidity meters use both methods and are equipped with a 90° angle sensor.
HI 98703
This portable meter is based on the European standard IOS 7027. Easy to use, sturdy and light weight, this microprocessor-based meter provides lab-grade accuracy in on-site conditions.
click on photo
to enlarge |
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Range |
0.00 - 9.99; 10.0 - 99.9 and 100 - 1000 NTU |
|
Resolution |
0.01 NTU from 0.00 - 9.99 NTU;
0.1 NTU from 10.0 - 99.9 NTU;
1 NTU from 100 - 1000 NTU |
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Accuracy |
± 2% of reading plus 0.02 NTU |
|
Repeatability |
±1% of reading or 0.02 NTU, whichever is greater |
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Light Source |
Tungsten filament lamp |
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Method |
Ratio Nephelometric Method (90°)
Ratio of scattered and transmitted light
Adapation of the USEPA Method 180.1
and Standard Method 2130 B. |
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Turbidity Standards |
< 0.1, 15, 100 and 750 NTU |
|
Calibration |
2, 3 or 4 points |
| Log Memory |
200 records |
| Serial interface |
USB or RS 232 |
| Power supply |
(4) 1.5V AA alkaline batteries or AC adapter
Auto-off after 15 minutes of non-use |
| *NTU = Nephelometric Turbidity Unit | |
This portable meter is based on the American standard. In addition to turbidity, you can also measure Free and Total Chlorine.
click on photo
to enlarge |
|
Range |
0.00 - 9.99; 10.0 - 99.9 and 100 - 1000 NTU |
|
Resolution |
0.01 NTU from 0.00 - 9.99 NTU;
0.1 NTU from 10.0 - 99.9 NTU;
1 NTU from 100 - 1000 NTU |
|
Accuracy |
± 2% of reading plus 0.02 NTU |
|
Repeatability |
±1% of reading or 0.02 NTU, whichever is greater |
|
Light Detector |
Silicon Photocell |
|
Method |
Ratio Nephelometric Method(90°)
Ratio of scattered and transmitted light
Adapation of the USEPA Method 180.1 and
Standard Method 2130 B. |
|
Turbidity Standards |
< 0.1, 15, 100 and 750 NTU |
|
Calibration |
2, 3 or 4 point |
|
Tech info : Chlorine |
| Range |
Free Cl2 0.00 - 5.00 mh/L; Total Cl2 0.00 - 5.00 mh/L |
| Resolution |
0.01 mg/L from 0.00 - 3.50 mg/L; 0.10 above 3.50 mg/L |
| Accuracy |
± 0.02 mg/L @ 1.00 mg/L |
| Detector |
Silicon photocell with 525 nm narrow band interference filter |
| Method |
Adapation of the USEPA Method 330.5 and
Standard Method 4500-Cl G.
The reaction between chlorine and DPD reagent
causes a pink tint in the sample |
| Standards |
1 mg/L free chlorine, 1 mg/L total chlorine |
| Calibration |
One - point calibration |
|
| Light source |
Tungsten filament lamp |
| Log Memory |
200 records |
| Serial Interface |
USB or RS 232 |
| Power Supply |
(4) 1.5AA alkine batteries or AC adapter
Auto - off after 15 minutes of non-use |
| * NTU = Nephelometric Turbidity Unit | |