Hanna Instruments HI93703 Portable Turbidity Meter ISO Compliant

The HI93703 is a tabletop turbidity meter with high accuracy that can be used to precisely measure the turbidity of water and wastewater both outdoors and in the lab. It is possible to purchase the meter as a kit that includes all of the AMCO-AEPA-1 principal turbidity standards needed for calibration and performance evaluation. For turbidimetric measurements, the HI93703 satisfies and goes beyond the standards of the ISO 7027 Method.

Up to three-point calibration
Positive-locking cuvette system
Water-resistant keypad

Category: Turbidity

Description

The HI93703 Portable Turbidity Meter was created specifically to detect the turbidity of water. It offers dependable and precise readings, even in low turbidity ranges. 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 LED light source’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

Single Beam Design – The HI93703 measures turbidity using a light detector at 90° for detection of scattered light. Turbidity measurements can be made in the 0.00 to 1000 FTU range.

ISO Compliant – The HI93703 meets and exceeds the requirements of ISO 7027 method for turbidity measurements by use of an infrared LED light source. As this meter has been designed to follow this ISO method, the units are displayed in FTU (Formazine Turbidity Unit); FTU is equivalent to the other internationally recognized unit of NTU (Nephelometric Turbidity Unit).

Calibration – The HI93703 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 or three-point turbidity calibration can be performed by using the supplied (0, 10, and 500 FTU) standards.

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.

Last Calibration Date – The HI93703 allows the user to store the last calibration date. Recall of the last calibration date is simple with a press of the “DATE” button on the face of the meter.

Low Battery Indicator – A “LO BAT” indication will appear on the lower right corner of the display when the batteries are low and need to be replaced. At this point, the instrument can still perform approximately 50 measurements. When the battery is too low to perform reliable measurements, a message appears and the meter will automatically switch off.

Significance of Use

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. According to ISO 7027:1999, the following are the specifications for an optical turbidity meter for the measurement of diffuse radiation used in low range measurements (i.e. drinking water):

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.

The HI93703 meets and exceeds the meter criteria specied by ISO 7027.

Principle 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 HI93703’s optical system consists of a scattered light detector (90°) and an LED.

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 HI93703’s optical system is made to have very little stray light, producing extremely accurate readings.

turbidity measurement

The HI93703C is available as a kit. The kit includes:

Portable turbidity meter
Sample cuvettes (2)
Caps (2)
Batteries (4 x 1.5V AA) and instructions
HI93703-0 (0 FTU) & HI93703-10 (10 FTU) calibration solutions
HI93703-50 cleaning solution
Tissue for wiping cuvettes
Rugged carrying case

The AMCO AEPA-1 standards for HI93703 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	HI93703-web
Product Name	HI93703 Portable Turbidity Meter ISO Compliant
Quote Required	Yes
Turbidity Range	0.00 to 1000 FTU
Turbidity Resolution	0.01 (0.00 to 50.00 FTU); 1 (50 to 1000 FTU)
Turbidity Accuracy	±0.5 FTU or ±5% of reading (whichever is greater)
Turbidity Calibration	three points (0 FTU, 10 FTU and 500 FTU)
Turbidity Light Source	silicon photocell
Turbidity Light Detector	infrared LED / life of instrument
Battery Type/Life	1.5V AA (4) /approximately 60 hours of continuous use or 900 measurements; auto-off after 5 minutes of non-use
Environment	0 to 50°C (32 to 122°F); RH max 95% (non condensing)
Dimensions	220 x 82 x 66 mm (8.7 x 3.2 x 2.6’’)
Weight	510 g (1.1 lb.)
Ordering Information	HI93703 is supplied complete with glass cuvette, batteries and instructions.

Hanna Instruments HI93703 Portable Turbidity Meter ISO Compliant

Features at-a-glance

Significance of Use

Principle of Operation

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