The HI88713 is a high accuracy benchtop turbidity meter. The meter is supplied complete with AMCO-AEPA-1 primary turbidity standards used for calibration and performance verification. The HI88713 meets and exceeds the requirements of the ISO 7027 Method for turbidimetric measurements.
The HI88713 Precision ISO Turbidity Benchtop Meter is specially designed for water quality measurements, providing reliable and accurate readings, even within low turbidity ranges. 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.
Four Measurement Modes – The HI88713 features four options for turbidity measurement: FNU (Formazin Nephelometric Units), FAU (Formazin Attenuation Units), and NTU (Nephelometric Turbidity Units) ratio and non-ratio mode. Turbidity ranges for each mode are 0.00 to 1000 FNU, 10.0 to 4000 FAU, 0.00 to 4000 NTU (ratio mode), and 0.00 to 1000 NTU (non-ratio mode).
Multiple Turbidity Units of Measure – Turbidity can be read as Formazin Nephelometric Units (FNU), Formazin Attenuation Units (FAU), European Brewing Convention units (EBC), and Nephelometric Turbidity Units (NTU).
ISO Compliant – The HI88713 meets and exceeds the requirements of ISO 7027 method for turbidity measurements by use of an infrared LED light source.
Calibration – The HI88713 has a powerful calibration function that compensates for variation in light intensity. The calibration can be done using the supplied calibration solutions or user-prepared standards. A two, three, four, or five-point turbidity calibration can be performed by using the supplied (<0.10, 15, 100, 750 FNU, and 2000 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.
GLP Data – The HI88713 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 USB port and the HI92000 software.
Tutorial Mode – The unique tutorial mode provides additional information to help the user during measurements. When enabled, the instrument displays explanations and a confirmation button when a preparation or other operation has to be performed.
Contextual Help – Contextual help is always available through a dedicated HELP button. Clear tutorial messages and directions are available on-screen to quickly and easily guide users through setup and calibration. The help information displayed is relative to the setting/option being viewed.
Backlit Graphic LCD Display – A graphic LCD display provides an easy to understand, user-friendly interface. All messages are in plain text making them easy to read.
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.
The ISO standard for turbidity measurement uses infrared wavelength of light that is outside the visible spectrum. The primary benefit of the ISO method over the EPA method is the reduction of color interference. The EPA method uses a tungsten lamp that produces light that contains all of the visible wavelengths of light that we see as white. A solution that is colored will be adsorbed by a complementary wavelength of light which will affect the turbidity reading. Since the ISO method is outside the visible wavelength of light the color in the sample does not interfere with the measurement. The USEPA prefers the tungsten lamp since it provides for better accuracy at low ranges and drinking water should not be colored. The requirements of an optical turbidity meter according to ISO 7027 are dependent on the measurement range. The measurement of diffuse radiation is typically for low range turbidity measurements (i.e. drinking water) with measurements expressed as formazin nephelometric units (FNU). The measurement of attenuation of radiant flux is for highly turbid samples (i.e. polluted water) and the measurements are expressed as formazin attenuation units (FAU). The design criteria for each method are:
Measurement of diffuse radiation for water with low turbidity (0 FNU to 40 FNU)
Measurement of attenuation of radiant flux for highly turbidity (40 FAU to 4000 FAU)
The HI88713 meets and exceeds the meter criteria specied by ISO 7027.
Principal of Operation
The light beam that passes through the sample is scattered in all directions. The intensity and pattern of the scattered light is affected by many variables, such as wavelength of the incident light, particle size and shape, refractive index, and color. The optical system of the HI88713 includes a LED, a scattered light detector (90°) and a transmitted light detector (180°). Which detectors are used are based on the measurement mode.
In the non-ratio turbidimeter range, the NTU and FNU values are calculated from the signal on the scattered light detector (90°).
In FAU mode the turbidity is calculated from the signal that reaches the transmitted light detector.
In the ratio turbidimeter range, the microprocessor of the instrument calculates the NTU value from both the scattered and transmitted light detectors. An effective algorithm is used to correct and compensate for interferences of color.
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 HI88713 is designed to have very low stray light, providing highly accurate results for low turbidity samples.
The HI88713-11 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
| Weight | 3.22 kg |
|---|---|
| Parameter | Turbidity |
| SKU | HI88713-01 |
| Name | ISO 7027 Compliant Benchtop Turbidity Meter – HI88713 |
| Turbidity Range | FNU mode: 0.00 to 9.99 FNU, 10.0 to 99.9 FNU, 100 to 1000 FNU FAU mode: 10.0 to 99.9 FAU, 100 to 4000 FAU Non-Ratio mode: 0.00 to 9.99 NTU; 10.0 to 99.9 NTU; 100 to 1000 NTU 0.00 to 9.99 EBC; 10.0 to 99.9 EBC; 100 to 245 EBC Ratio mode: 0.00 to 9.99 NTU; 10.0 to 99.9 NTU; 100 to 4000 NTU 0.00 to 9.99 EBC; 10.0 to 99.9 EBC; 100 to 980 EBC |
| Turbidity Resolution | FNU mode: 0.01 FNU, 0.1 FNU, 1 FNU FAU mode: 0.1 FAU, 1 FAU Non-Ratio mode: 0.01; 0.1; 1 NTU; 0.01; 0.1; 1 EBC Ratio mode: 0.01; 0.1; 1 NTU; 0.01; 0.1; 1 EBC. |
| Turbidity Accuracy | FNU mode: ±2% of reading plus stray light FAU mode: ± 10% of reading Non-Ratio mode: ±2% of reading plus stray light Ratio mode: ±2% of reading plus stray light, ±5% of reading above 1000 NTU. |
| Turbidity Repeatability | ±1% of reading or 0.02 NTU (0.15 Nephelos; 0.01 EBC) whichever is greater |
| Turbidity Stray Light | < 0.02 NTU (0.15 Nephelos; 0.01 EBC) |
| Turbidity Calibration | two, three, four, or five-point calibration |
| Turbidity Measuring Method | nephelometric method (90°) or 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 | IR LED |
| Turbidity Light Detector | silicon photocell |
| Logging Memory | 200 records |
| Connectivity | USB |
| Display | 40 x 70 mm graphic LCD (64 x 128 pixels) with backlight |
| Power Supply | 12 VDC adapter (included) |
| Environment | 0 to 50°C (32 to 122°F), RH max 95% non-condensing |
| Dimensions | 230 x 200 x 145 mm (9.0 x 7.9 x 5.7 in.) |
| Weight | 2.5 kg (88 oz.) |
HI88713 is supplied with sample cuvettes and caps (6), calibration cuvettes, silicone oil, cuvette wiping cloth, power adapter, and instruction manual.
To empower customers to achieve quality
by supplying intuitive, accurate, and reliable analytical instruments with exceptional customer service and value.
We take pride in every product we build. From an original idea, to a completed product ready for testing. We oversee every aspect of the manufacturing process. It is this level of attention to detail that sets us apart.
To empower customers to achieve quality by supplying intuitive, accurate, and reliable analytical instruments with exceptional customer service and value.
We take pride in every product we build. From an original idea, to a completed product ready for testing. We oversee every aspect of the manufacturing process. It is this level of attention to detail that sets us apart.
To empower customers to achieve quality by supplying intuitive, accurate, and reliable analytical instruments with exceptional customer service and value.
We take pride in every product we build. From an original idea, to a completed product ready for testing. We oversee every aspect of the manufacturing process. It is this level of attention to detail that sets us apart.
