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Details
The HI98703 Precision Turbidity Portable
Meter is specially designed for water quality measurements, providing
reliable and accurate readings, especially in the low turbidity range.
The instrument is based on a state-of-the-art optical system which
guarantees accurate results, assures long term stability, and minimizes
stray light and color interferences. Periodic calibration with the
supplied standards compensates for any variations in intensity of the
tungsten lamp. The 25 mm round cuvettes composed of special optical
glass guarantee the repeatability of turbidity measurements.
Features at-a-glance
Multiple reading modes - Normal measurement, continuous measurement, or signal averaging measurement are reading modes available.
EPA CompliantMeasurement - The
HI98703 meets and exceeds the requirements of EPA and Standard Methods
for turbidity measurements. When the meter is in EPA mode all turbidity
readings are rounded accordingly to meet reporting requirements.
Calibration – A two,
three, or four-point turbidity calibration can be performed by using the
supplied (<0.10, 15.0, 100, and 750 NTU) standards. Calibration
points can be modified if user-prepared standards are used.
AMCO AEPA-1 Primary Turbidity Standard
- The AMCO AEPA-1 supplied standards are recognized as a primary
standard by the USEPA. These non-toxic standards are made of styrene
divinylbenzene polymer spheres that are uniform in size and density. The
standards are reusable and stable with a long shelf life.
Fast Tracker™ - For advanced ˜field applications, the HI98703 is equipped with Fast Tracker™ - Tag Identi˜fication System (T.I.S.) that makes data collecting and management simpler than ever. Fast Tracker™ allows users to record the time and location of a speci˜fic measurement or series of measurements using iButton® tags near sampling points for quick and easy readings. Each iButton® tag contains a computer chip with a unique identi˜cation code encased in stainless steel.
GLP Data – The HI98703
features complete GLP (Good Laboratory Practice) functions that allow
traceability of the calibration conditions. Data includes calibration
points, date, and time.
Data Logging – Up to 200 measurements can be stored in the internal memory and recalled at any time.
Data Transfer – For
further storage or analysis options, logged data can be downloaded to a
Windows compatible PC using the RS232 or USB port and the HI92000
software.
Backlit Display – A backlit LCD
display provides an easy to understand, user-friendly interface.
Displayed codes guide the user step-by-step through routine operation
and calibration.
Significance of Use
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, signi˜ficant 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
-
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.
-
Report results as follows:
NTU reading
|
Rounded to nearest
|
0.0 - 1.0
|
0.05
|
1 - 10
|
0.1
|
10 - 40
|
1
|
40 - 100
|
5
|
100 - 400
|
10
|
400 - 1000
|
50
|
>1000
|
100
|
The
HI98703 meets and exceeds the meter criteria speci˜ed by the EPA Method
180.1 and Standard Methods for the Examination of Water and Wastewater
2130 B.
Principle of Operation
The light beam that passes through the sample is
scattered in all directions. The intensity and pattern of the scattered
light is a‰ffected by many variables, such as wavelength of the incident
light, particle size and shape, refractive index, and color. The
optical system of the HI98703 includes a tungsten fi˜lament lamp, a
scattered light detector (90°) and a transmitted light detector (180°).
In the ratio turbidimeter range, the microprocessor
of the instrument calculates the NTU value from the signals that reach
the two detectors by using an eff‰ective algorithm that corrects and
compensates for interferences of color. The optical system and measuring
technique also compensate for fluctuations in lamp intensity,
minimizing the need for frequent calibration.
In
the non-ratio turbidimeter range, the NTU value is calculated from the
signal on the scattered light detector (90°). This method off‰ers a high
linearity on the low range but is more sensitive to lamp intensity
‡fluctuations. The lower detection limit of a turbidimeter is determined
by stray light that is detected by the sensors but not caused by light
scattering from suspended particles. The optical system of the HI98703
is designed to have very low stray light, providing highly accurate
results for low turbidity samples.
The
HI98703-11 AMCO AEPA-1 standards ensure that measurements are traceable
to a primary reference materials. These standards are used for
calibration and performance verification of the turbidity meter.
Supplied with Certificate of Analysis
- Lot number
- Expiration date
- Standard value @ 25 °C
- Reference meter NIST traceable
Provided storage containers
- Light tight
- Protects from accidental breakage
| Range |
0.00 to 9.99; 10.0 to 99.9; 100 to 1000 NTU |
| Resolution |
0.01; 0.1; 1 NTU |
| Range Selection |
automatic |
| Accuracy |
±2% of reading plus 0.02 NTU |
| Repeatability |
±1% of reading or 0.02 NTU, whichever is greater |
| Stray Light |
< 0.02 NTU |
| Light Detector |
silicon photocell |
| Method |
ratio nephelometric method (90° & 180°) |
| Measuring Mode |
normal, average, continuous |
| Turbidity Standards |
< 0.1, 15, 100, and 750 NTU |
| Calibration |
two, three, or four-point calibration |
| Light Source |
tungsten filament lamp / greater than 100,000 readings |
| Display |
60 x 90 mm backlit LCD |
| Log Memory |
200 records |
| Connectivity |
USB or RS232 |
| Environment |
0 to 50°C (32 to 122°F), RH max 95% non-condensing |
| Power Supply |
1.5V AA alkaline batteries (4) or AC adapter; auto-off after 15 minutes of non-use |
| Dimensions |
224 x 87 x 77 mm (8.8 x 3.4 x 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. |
| Warranty |
2 years |
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