MANUFACTURER
HI88703 is a high accuracy benchtop refractometer (±2% total value 0.02 NTU). The meter is supplied complete with AMCO-AEPA-1 turbidity standards for calibration and measurement. The HI88703 meets the requirements of Method 180.1 and Standard Methods for the Examination of Water and Wastewater 2130 B for turbidity measurement.
USB port
EPA
The HI88703 benchtop turbidity meter is specifically designed for water quality measurements, providing reliable and accurate results, especially in the low turbidity range. It is based on an advanced optical system that ensures accurate and long-term stable results, and minimizes stray light and color interferences. Regular calibration with the supplied standards compensates for variations in the intensity of the tungsten lamp. The 25 mm round cuvettes made of special optical glass ensure repeatability of turbidity measurements.
SALIENT FEATURES
Two scales – The HI88703 has two ranges for measuring turbidity: 0.00-4,000 NTU (Nephelometric Units) and 0.00-40.0 in NTU
Multiple units of measure – Turbidity measurement results can be read in Nephelometric Units (NTU), EBC, or Nephelos units.
EPA Compliance – HI88703 meets EPA requirements and standard methods for measuring turbidity. When the meter is in EPA mode, all turbidity readings are rounded to meet reporting requirements.
Calibration – HI88703 Powerful calibration function that compensates for lamp aging or changes. Calibration can be performed using the supplied calibration solutions or user standards. Two, three, four or five point turbidity calibration using the supplied standards (<0.1, 15, 100, 750 and 2000 NTU). Calibration points can be changed if user standards are used.
AMCO AEPA-1 – AMCO AEPA-1 is a USEPA approved primary standard. The non-toxic standard is made of styrene divinylbenzene polymer that is uniform in size and density. The standard solution is reusable and stable with a long shelf life.
Data GLP – The HI88703 features complete GLP (Good Laboratory Practice) functionality allowing traceability of calibration conditions. Data includes calibration points, date, and time.
Record data – Up to 200 measurements can be stored in internal memory and recalled at any time.
Data transmission– For further storage or analysis, recorded data can be downloaded to a Windows computer using the USB port and HI 92000 software.
Guide Mode – Unique guidance modes provide additional information to assist the user during measurements. When activated, the instrument displays explanations and a confirmation button when further operations are required.
Contextual help – Context-sensitive help is always available at the touch of a button. Clear and easy-to-read on-screen instructions quickly and easily guide users through setup and calibration.
LCD graphic display – A graphical LCD display provides a user-friendly interface. All messages are in easy-to-read text.
IMPORTANCE
Turbidity is one of the most important parameters used to determine the quality of drinking water. Turbidity is considered a characteristic for identifying pathogens in drinking water. In natural waters, turbidity measurements are performed to assess the general quality of water and its suitability for applications involving aquatic organisms. Wastewater monitoring and treatment were once based solely on turbidity control. Nowadays, turbidity measurements at the end of wastewater treatment are necessary to verify that 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 passing through a liquid is primarily caused by the suspended solids present. The higher the turbidity, the greater the amount of scattered light. Even a pure liquid will scatter light to some extent, meaning that no solution has a turbidity value of zero.
Drinking water from water treatment plants is obtained from surface waters subject to EPA requirements for monitoring and reporting of turbidity. Surface water sources include lakes and rivers. The requirements for turbidity measurement and reporting according to EPA Method 180.1 are:
The applicable scale is 0-40 nephelometric turbidity units (NTU)
Light Source: Tungsten lamp operating at color temperature from 2200-3000°K.
Distance of passage of incident light and scattered light in the sample tube: Total not exceeding 10 cm
The sensitivity of the instrument allows detection of a turbidity difference of 0.02 NTU or less than 1 unit.
The results are reported as follows:
|
Results by NTU |
Round about |
|
0.0 – 1.0 |
0.05 |
|
1 – 10 |
0.1 |
|
10 – 40 |
1 |
|
40 – 100 |
5 |
|
100 – 400 |
10 |
|
400 – 1000 |
50 |
|
>1000 |
100 |
HI88703 Meets the requirements of Method 180.1 and Standard Methods for the Examination of Water and Wastewater 2130 B for the measurement of turbidity.
OPERATING PRINCIPLE
Light beams passing through the sample are scattered in all directions. The intensity and pattern of scattered light are affected by many factors, such as the wavelength of the incident light, particle size and shape, refractive index, and color. The optical system consists of a tungsten lamp, a scattered light detector (90°), and a transmitted light detector (180°).
When measuring turbidity in proportions, the instrument's microprocessor calculates the NTU value from the signals to the two detectors using a color correction and noise compensation algorithm. The optical system and measurement technique also compensate for changes in lamp intensity, reducing the need for frequent calibration.
When measuring non-ratio turbidity, the NTU value is calculated from the signals on the scattered light detector (90°). This method provides high linearity at low ranges but is more sensitive to changes in lamp intensity. The lower detection limit of a turbidimeter is determined by stray light that is detected by the sensor but not by light scattering from suspended particles. The optical system is designed to have very low stray light, providing highly accurate results for low turbidity samples.
SPECIFICATIONS
|
Non-proportional mode scale |
0.00 to 9.99 NTU; 10.0 to 40.0 NTU; 0.0 to 99.9 Nephelos; 100 to 268 Nephelos; 0.00 to 9.80 EBC |
|
Resolution in non-proportional mode |
0.01 NTU; 0.1 NTU; 0.1 Nephelos; 1 Nephelos; 0.01 EBC |
|
Proportional Turbidity Scale |
0.00 to 9.99; 10.0 to 99.9; 100 to 4000 NTU; 0.0 to 99.9; 100 to 26800 Nephelos; 0.00 to 9.99; 10.0 to 99.9; 100 to 980 EBC |
|
Proportional turbidity resolution |
0.01; 0.1; 1 NTU; 0.1; 1 Nephelos; 0.01; 0.1, 1 EBC |
|
Select scale |
automatic |
|
Accuracy |
±2% value plus 0.02 NTU (0.15 Nephelos; 0.01 EBC); ±5% value above 1000 NTU (6700 Nephelos; 245 EBC) |
|
Repeatability |
±1% value or 0.02 NTU (0.15 Nephelos; 0.01 EBC) whichever is greater |
|
Lost light |
< 0.02 NTU (0.15 Nephelos; 0.01 EBC) |
|
Light source |
silicon photovoltaic cells |
|
Method |
nephelometric (90°) or proportional nephelometric (90° & 180°), based on USEPA Method 180.1 and Standard Method 2130 B |
|
Measurement mode |
normal, average, continuous |
|
Turbidity standard |
< 0.1, 15, 100, 750 and 2000 NTU |
|
Standard |
2, 3, 4 or 5 points |
|
MACHINE SPECIFICATIONS |
|
|
Light source |
tungsten filament lamp/greater than 100,000 value |
|
Screen |
40 x 70 mm (64 x 128 pixels) LCD graphic with backlight |
|
Recording memory |
200 records |
|
Connect |
USB |
|
Environment |
0 to 50°C (32 to 122°F), RH max 95% non-condensing |
|
Electricity supply |
230/115 Vac; 50/60 Hz |
|
Size |
230 x 200 x 145 mm / 2.5 kg |
|
Guarantee |
12 months (for products with intact tags and warranty card) |
|
Supply includes |
– HI88703* meter – 5 sample cuvettes with lids – HI88703-11 Turbidity Calibration Solution Set – Silicone oil – Cuvette cleaning cloth - Wire – Equipment quality certification - Warranty - User manual. – Paper container * HI88703-01 : 115V HI88703-02 : 230V |
|
Non-proportional mode scale |
0.00 to 9.99 NTU; 10.0 to 40.0 NTU; 0.0 to 99.9 Nephelos; 100 to 268 Nephelos; 0.00 to 9.80 EBC |
|
Resolution in non-proportional mode |
0.01 NTU; 0.1 NTU; 0.1 Nephelos; 1 Nephelos; 0.01 EBC |
|
Proportional Turbidity Scale |
0.00 to 9.99; 10.0 to 99.9; 100 to 4000 NTU; 0.0 to 99.9; 100 to 26800 Nephelos; 0.00 to 9.99; 10.0 to 99.9; 100 to 980 EBC |
|
Proportional turbidity resolution |
0.01; 0.1; 1 NTU; 0.1; 1 Nephelos; 0.01; 0.1, 1 EBC |
|
Select scale |
automatic |
|
Accuracy |
±2% value plus 0.02 NTU (0.15 Nephelos; 0.01 EBC); ±5% value above 1000 NTU (6700 Nephelos; 245 EBC) |
|
Repeatability |
±1% value or 0.02 NTU (0.15 Nephelos; 0.01 EBC) whichever is greater |
|
Lost light |
< 0.02 NTU (0.15 Nephelos; 0.01 EBC) |
|
Light source |
silicon photovoltaic cells |
|
Method |
nephelometric (90°) or proportional nephelometric (90° & 180°), based on USEPA Method 180.1 and Standard Method 2130 B |
|
Measurement mode |
normal, average, continuous |
|
Turbidity standard |
< 0.1, 15, 100, 750 and 2000 NTU |
|
Standard |
2, 3, 4 or 5 points |
|
MACHINE SPECIFICATIONS |
|
|
Light source |
tungsten filament lamp/greater than 100,000 value |
|
Screen |
40 x 70 mm (64 x 128 pixels) LCD graphic with backlight |
|
Recording memory |
200 records |
|
Connect |
USB |
|
Environment |
0 to 50°C (32 to 122°F), RH max 95% non-condensing |
|
Electricity supply |
230/115 Vac; 50/60 Hz |
|
Size |
230 x 200 x 145 mm / 2.5 kg |
|
Guarantee |
12 months (for products with intact tags and warranty card) |
|
Supply includes |
– HI88703* meter – 5 sample cuvettes with lids – HI88703-11 Turbidity Calibration Solution Set – Silicone oil – Cuvette cleaning cloth - Wire – Equipment quality certification - Warranty - User manual. – Paper container * HI88703-01 : 115V HI88703-02 : 230V |
