Product Overview

• HI98713 is a high-precision portable turbidity meter. This meter is supplied with AMCO-AEPA-1 primary turbidity standards for calibration and performance verification. HI98713 meets and exceeds the requirements of the ISO 7027 turbidity measurement method.

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

• USB for data transfer

• Up to four-point calibration

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• More information

• The HI98713 precision ISO turbidity portable meter is designed specifically for water quality measurement, providing reliable and accurate readings

• The HI98713 precision ISO turbidity portable meter is designed specifically for water quality measurement, providing reliable and accurate readings even in the low turbidity range. The instrument is based on a state-of-the-art optical system that ensures accurate results, ensures long-term stability, and minimizes stray light and color interference. Regular calibration using the supplied standards compensates for any variation in the intensity of the LED light source. The 25 mm round cuvette made of special optical glass guarantees the repeatability of turbidity measurements.

• Features at a glance

• Ratio measurement mode - HI98713 uses the ratio method to measure turbidity, using 90° and 180° light detectors for more accurate measurements. Turbidity measurement can be performed in the range of 0.00 to 1000 FNU.

• Multiple reading modes - Normal measurement, continuous measurement, or signal averaging measurement are available reading modes.

• ISO compliant - HI98713 meets and exceeds the requirements of the ISO 7027 method for measuring turbidity using an infrared LED light source.

• Calibration – HI98713 features a powerful calibration function that compensates for changes in light intensity. Calibration can be performed using the supplied calibration solutions or user-prepared standards. Two-point, three-point, or four-point turbidity calibration can be performed using the supplied (<0.1, 15, 100 and 750 FNU) standards. If user-prepared standards are used, the calibration points can be modified.

• AMCO AEPA-1 primary turbidity standards - The standards provided 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 HI98713 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. Each iButton® tag contains a computer chip encapsulated in stainless steel with a unique identification code.

• GLP data – HI98713 features full GLP (Good Laboratory Practice) functionality 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, recorded data can be downloaded to a Windows®-compatible PC using the USB or RS232 port and HI92000 software.

• Backlit graphic LCD display – The graphic LCD display provides an easy-to-understand, user-friendly interface. All information is in plain text for easy reading.

• Significance of use

• Turbidity is one of the most important parameters in determining the quality of drinking water. Once considered primarily an aesthetic characteristic of drinking water, there is important evidence that controlling turbidity is an effective safeguard against pathogens. In natural waters, turbidity measurement is performed to measure general water quality and its compatibility in applications involving aquatic organisms. 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 its value is 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 mainly 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, because no solution has zero turbidity.

• The ISO turbidity measurement standard uses light at infrared wavelengths outside the visible spectrum. The main advantage of the ISO method compared to the EPA method is reduced color interference. The EPA method uses a tungsten lamp, which produces light containing all visible wavelengths of what we see as white light. Colored solutions will absorb light at complementary wavelengths, which will affect turbidity readings. Since the ISO method is outside the visible wavelengths, color in the sample will not interfere with the measurement. The US EPA prefers tungsten lamps because they provide better accuracy in the low range, and drinking water should not be colored. According to ISO 7027, the requirements for optical turbidimeters used to measure scattered radiation in low-range measurements (i.e., drinking water), expressed in formazin nephelometric units (FNU), are:

• Measurement of scattered radiation in low turbidity water (0 FNU to 40 FNU)

• The wavelength of the incident radiation shall be 860 nm

• The spectral bandwidth of the incident radiation shall be less than or equal to 60 nm

• The parallelism of the incident radiation shall not exhibit divergence, and any convergence shall not exceed 1.5°.

• The measurement angle θ between the optical axis of the incident radiation and the optical axis of the scattered radiation shall be 90°±2.5°.

• The aperture angle in the water sample shall be between 20° and 30°.

• HI98713 meets and exceeds the instrument standards specified in ISO 7027.

• Operating principle

• The light beam passing through the 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 HI98713 includes an LED, a scattered light detector (90°), and a transmitted light detector (180°). The detector used is based on the measurement mode.

• The lower detection limit of a turbidimeter is determined by the stray light detected by the sensor that is not caused by light scattering from suspended particles. The optical system of the HI98713 is designed to have very low stray light, providing highly accurate results for low turbidity samples.

HI98713-11 AMCO AEPA-1 standards ensure that measurements 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 at 25°C

• NIST traceable reference instrument

• Storage container provided

• Light-proof

• Protects against accidental breakage