Product Overview

• HI98703

• Portable multi-range turbidity meter (EPA compliant)

• Portable high-precision, multi-range turbidity meter. The large sample cuvette combined with an excellent optical system allows the microprocessor to calculate the turbidity value from the light intensity reaching the detector; color interference is corrected, with color compensation and automatic light source compensation functions, avoiding interference caused by light source fluctuations and eliminating the need for frequent calibration. It is especially suitable for high-precision measurement of low-range turbidity, applicable to water quality monitoring, wastewater and other fields, and can be used as a portable field unit or a benchtop laboratory unit.

• Backlit LCD large-screen display, stability indicator, on-screen operation prompts

• GLP management functions, query settings, calibration, time and other information

• Multi-range measurement, automatic range switching

• USEPA 180.1 standard and Standard Method 2130B method

• USB-RS232 dual data interface, 200 data sets storage, good data management

• Technical parameters:

• Main unit, HI98703-11 turbidity (EPA) calibration kit, HI731333N dedicated glass cuvette set, Chinese and English instruction manual

• HI98703-EPA Portable.pdf

• The HI98703 is a high-precision (reading ±2% plus 0.02 NTU) portable turbidity meter. The meter is supplied with AMCO-AEPA-1 primary turbidity standards for calibration and performance verification. The HI98703 meets and exceeds the turbidity measurement requirements of EPA Method 180.1 and Standard Methods 2130 B for the examination of water and wastewater.

• Fast Tracker™ - Tag Identification System (T.I.S.)

• USB for data transfer

• Powered by battery or line voltage

The HI98703 precision portable turbidity meter is designed for water quality measurement, providing reliable and accurate readings, especially in the low turbidity range. The instrument is based on a state-of-the-art optical system that guarantees accurate results, ensures long-term stability, and minimizes stray light and color interference. Regular calibration with the supplied standards compensates for any variation in tungsten lamp intensity. The 25 mm round cuvette is made of special optical glass, ensuring repeatability of turbidity measurements.

• Features at a glance

• Multiple reading modes - Provides normal measurement, continuous measurement, or signal averaging measurement.

• EPA-compliant measurement - The HI98703 meets and exceeds the requirements of EPA and Standard Methods for turbidity measurement. When the meter is in EPA mode, all turbidity readings are rounded accordingly to meet reporting requirements.

• Calibration – Two-point, three-point, or four-point turbidity calibration can be performed using the supplied standards (<0.10, 15.0, 100, and 750 NTU). Calibration points can be modified if user-prepared standards are used.

• AMCO AEPA-1 primary turbidity standards - The standards supplied by AMCO AEPA-1 are recognized by the US EPA as primary standards. These non-toxic standards are made of styrene divinylbenzene polymer spheres of uniform size and density. These standards are reusable and stable with a long shelf life.

• Fast Tracker™ - For advanced field applications, the HI98703 is equipped with the Fast Tracker™ Tag Identification System (T.I.S.), making data collection and management easier than ever. Fast Tracker™ allows users to record the time and location of a specific measurement or series of measurements using iButton tags near the sampling point, for quick and easy reading of results. Each iButton tag contains a computer chip with a unique identification code encapsulated in stainless steel. ®®

• GLP data – The HI98703 features full GLP (Good Laboratory Practice) functions for traceable calibration conditions. Data includes calibration points, date, and time.

• Data logging – Up to 200 measurement values can be stored in 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 HI92000 software.

• Backlit display – The backlit LCD display provides an easy-to-understand, user-friendly interface. Displayed codes guide the user step by step through routine operations and calibration.

• Significance of use

• Turbidity is one of the most important parameters used to determine drinking water quality. Once considered primarily an aesthetic characteristic of drinking water, there is now substantial evidence that turbidity control is an effective safeguard against pathogens. In natural waters, turbidity measurement is used to measure general water quality and its compatibility in applications involving aquatic life. Monitoring and treatment of wastewater was once based entirely on turbidity control. Currently, it is necessary to measure turbidity at the end of the wastewater treatment process to verify that these values meet regulatory standards.

• The cloudiness of water is an optical property that causes light to be scattered and absorbed rather than transmitted. Light scattering through a liquid is primarily caused by the presence of suspended solids. The higher the turbidity, the greater the amount of scattered light. Even very pure liquids scatter light to some extent, as no solution has zero turbidity.

• The EPA requires drinking water treatment plants that obtain water from surface water to monitor and report turbidity. Surface water sources include lakes and rivers. The requirements for turbidity meters and reported measurements under EPA Method 180.1 are:

• Applicable range is 0-40 turbidity units (NTU)

• Light source: Tungsten lamp operating at a color temperature between 2200-3000°K.

• Distance traveled by incident light and scattered light through the sample tube: not exceeding 10 cm total.

• Detector: Centered at 90° to the incident light path, not exceeding ±30° from 90°. The spectral peak response of the detector and filter system (if used) should be between 400 nm and 600 nm

• The sensitivity of the instrument should allow detection of a turbidity difference of 0.02 NTU or less in water with turbidity 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 instrument standards specified in EPA Method 180.1 and Standard Methods 2130 B for the examination of water and wastewater.

• Working principle

• A beam of light passing through a sample is scattered in all directions. The intensity and pattern of the scattered light are affected by many variables, such as the wavelength of the incident light, particle size and shape, refractive index, and color. The optical system of the HI98703 includes a tungsten lamp, a scattered light detector (90°), and a transmitted light detector (180°).

• In the ratio turbidimeter range, the instrument's microprocessor uses an effective algorithm for correcting and compensating color interference to calculate the NTU value from the signals reaching both detectors. The optical system and measurement technique also compensate for lamp intensity fluctuations, 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 provides high linearity in the low range but is more sensitive to lamp intensity fluctuations. The lower detection limit of a turbidimeter is determined by the stray light detected by the sensor, but not by light scattering from suspended particles. The optical system of the HI98703 is designed to have very low stray light, providing high-precision results for low turbidity samples.

• Working principle:

• Turbidity standards

• HI98703-11 AMCO AEPA-1 standards ensure measurement results are traceable to primary reference materials. These standards are used for calibration and performance verification of turbidity meters.

• Certificate of analysis provided

• Lot number

• Expiration date

• Standard value @ 25 C°

• Reference meter NIST traceable

• Storage container provided

• Light-tight

• Protection against accidental breakage