Hanna Instruments HI88713-02 ISO 7027 Compliant Benchtop Turbidity Meter

The HI88713 is a tabletop turbidity meter with outstanding accuracy. AMCO-AEPA-1 primary turbidity standards are included with the meter and are used for performance testing and calibration. The standards of the ISO 7027 Method for turbidimetric measurements are met and even exceeded by the HI88713.

Compliant to ISO 7027 method
Ratio and non-ratio turbidity modes
USB for data transfer

Category: Turbidity

Description

The HI88713 Precision ISO Turbidity Benchtop Meter is specifically made for measuring the turbidity of water, and it delivers dependable results even at low turbidity levels. The instrument’s optical system is state-of-the-art, ensuring accuracy, long-term stability, and reducing stray light and color interferences. Any changes in the tungsten lamp’s intensity are offset by routine calibration using the provided standards. The repeatability of turbidity measurements is ensured by the 25 mm round cuvettes made of superior optical glass.

Features at-a-glance:

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.

One of the most crucial factors used to assess the quality of drinking water is turbidity. There is significant evidence that reducing turbidity is an effective defense against infections, despite it once being thought of as a mostly aesthetic property of drinking water. Turbidity measurements are made in natural water to assess the water’s general quality and suitability for uses involving aquatic creatures. Turbidity management used to be the only factor considered in the monitoring and treatment of wastewater. To confirm that the values meet legal standards, turbidity monitoring is currently required at the end of the wastewater treatment process.

Water turbidity is an optical characteristic that prevents light from being transferred and instead scatters and absorbs it. The suspended solids in a liquid play a major role in scattering light as it moves through it. The amount of light scattered increases with turbidity. Since there will always be some turbidity in a solution, even a perfectly pure liquid will occasionally scatter light.

The infrared wavelength of light, which is not inside the visible spectrum, is used in the ISO standard for turbidity measurement. The minimization of color interference is the main advantage of the ISO technique over the EPA method. The EPA approach makes use of a tungsten lamp, which emits light with all of the visible light wavelengths that we perceive as white. A complimentary wavelength of light will adsorb a colored solution, affecting the turbidity reading. The color of the sample has no impact on the measurement because the ISO method operates outside of the visible range of light. Since drinking water shouldn’t be colored and tungsten lamps offer superior accuracy at low ranges, the USEPA favors them. The measuring range affects the specifications for an optical turbidity meter under ISO 7027. When measuring low range turbidity, such as in drinking water, diffuse radiation is often measured and the results are represented in formazin nephelometric units (FNU). Highly turbid samples (i.e., contaminated water) are used to measure the attenuation of radiant flux, and the measurements are reported as formazin attenuation units (FAU). Each method’s design criteria are as follows:

Measurement of diffuse radiation for water with low turbidity (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
There shall be no divergence from parallelism of the incident radiation and any convergence shall not exceed 1.5o.
The measuring angle, theta, between the optical axis of the incident radiation and that of the diffused radiation shall be 90o +/- 2.5o.
The aperture angle should be between 20o and 30o in the water sample.

Measurement of attenuation of radiant flux for highly turbidity (40 FAU to 4000 FAU)

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
There shall be no divergence from parallelism of the incident radiation and any convergence shall not exceed 2.5o.
The measuring angle of the incident radiation and that of the diffuse radiation shall be 0o +/- 2.5o.
The aperture angle should be between 10o and 20o in the water sample.

The HI88713 meets and exceeds the meter criteria specied by ISO 7027.

Principal of Operation

The sample scatters the light beam that passes through it in all directions. Numerous factors, including the wavelength of the incident light, the size and shape of the particles, the refractive index, and the color, influence the intensity and pattern of the scattered light. The HI88713’s optical system consists of an LED, a scattered light detector (90 degrees), and a transmitted light detector (180 degrees). According on the measurement mode, different detectors are employed.

The NTU and FNU values are determined from the signal on the scattered light detector (90°) in the non-ratio turbidimeter range.

In FAU mode, the signal that reaches the transmitted light detector is used to determine the turbidity.

The microprocessor of the instrument determines the NTU value from both the scattered and transmitted light detectors in the ratio turbidimeter range. Color interferences are corrected and compensated for using an efficient method.

The stray light that is detected by the sensors but is not brought on by light scattering from suspended particles determines the lower detection limit of a turbidimeter. For low turbidity samples, the HI88713’s optical system is made to have very little stray light, producing extremely accurate readings.

Turbidity meter light path

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

Lot number
Expiration date
Standard value @ 25 ^°C
Reference meter NIST traceable

Provided storage containers

Light tight
Protects from accidental breakage

More Information
SKU	HI88713-02
Product Name	ISO 7027 Compliant Benchtop Turbidity Meter – HI88713
Quote Required	Yes
Turbidity Range	FNU mode
Turbidity Resolution	FNU mode
Turbidity Accuracy	FNU mode
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”)
Weight	2.5 kg (88 oz.)
Ordering Information	HI88713 is supplied with sample cuvettes and caps (6), calibration cuvettes, silicone oil, cuvette wiping cloth, power adapter, and instruction manual.

Hanna Instruments HI88713-02 ISO 7027 Compliant Benchtop Turbidity Meter

Features at-a-glance:

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