HI98703 High accuracy (±2% of reading plus 0.02 NTU) Turbidity Portable Meter.

The HI98703 Precision Turbidity Portable Meter is specially designed for water quality measurements, providing reliable and accurate readings, especially in the low turbidity range. 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.

Features at-a-glance

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

EPA CompliantMeasurement – The HI98703 meets and exceeds the requirements of EPA and Standard Methods for turbidity measurements. When the meter is in EPA mode all turbidity readings are rounded accordingly to meet reporting requirements.

Calibration – A two, three, or four-point turbidity calibration can be performed by using the supplied (<0.10, 15.0, 100, and 750 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.

Fast Tracker^™ – For advanced ˜field applications, the HI98703 is equipped with Fast Tracker^™ – Tag Identi˜fication System (T.I.S.) that makes data collecting and management simpler than ever. Fast Tracker^™ allows users to record the time and location of a speci˜fic measurement or series of measurements using iButton^® tags near sampling points for quick and easy readings. Each iButton^® tag contains a computer chip with a unique identi˜cation code encased in stainless steel.

GLP Data – The HI98703 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 RS232 or USB port and the HI92000 software.

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

Principle of Operation

The light beam that passes through the sample is scattered in all directions. The intensity and pattern of the scattered light is a‰ffected by many variables, such as wavelength of the incident light, particle size and shape, refractive index, and color. The optical system of the HI98703 includes a tungsten fi˜lament lamp, a scattered light detector (90°) and a transmitted light detector (180°).

In the ratio turbidimeter range, the microprocessor of the instrument calculates the NTU value from the signals that reach the two detectors by using an eff‰ective algorithm that corrects and compensates for interferences of color. The optical system and measuring technique also compensate for fluctuations in lamp intensity, 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 off‰ers a high linearity on the low range but is more sensitive to lamp intensity ‡fluctuations. 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 HI98703 is designed to have very low stray light, providing highly accurate results for low turbidity samples.

The HI98703-11 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

The HI98703-11 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.