Hanna Instruments HI 88713 User Manual

Page 5

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Note: If you are using multiple cuvettes, always match the cuvettes.

CUVETTE HANDLING

The cuvettes should be free of scratches or cracks. Any cuvette with visible scratches should be

discarded. The cuvettes should be periodically washed with acid. After washing, the cuvettes

should be rinsed well with distilled or deionized water, multiple times. Allow cuvettes to air-dry

and store them for long periods of time with theire caps, to avoid dirt entering inside. Always

handle the cuvette by touching only the cap or its top side (over the horizontal line).
Always store the cuvettes in separate boxes or with separators between them to avoid scratches
on the surface.

CUVETTE PREPARATION

Whenever a cuvette is used, it must be clean inside and outside. When it is placed into the

instrument, it must be dry outside, completely free of fingerprints or dirt.

GENERAL TIPS FOR AN ACCURATE MEASUREMENT

The HI 88713 is a highly accurate bench too turbidity meter. Special care must be taken during

calibration and sample preparation to optimize the instrument performance and to fully benefit from

its features. Is very important for the analyst to use proper measurement techniques for accurate,

precise and repeatable readings. The instructions listed below should be carefully followed during

calibration and measurement to ensure optimum accuracy.

GENERAL RULES
• Always put the instrument on a flat, rugged surface when taking measurements.

• Do not operate in direct sunlight.

• Keep the lid of the instrument closed when it is not used to prevent dust or dirt entering inside.
• Always close the cuvette lid during measurement.

• Always use cuvettes without scratches or cracks because they can cause inaccurate readings.

• Always cap the cuvettes to prevent the sample from spilling
• To prevent contamination of the optical system, do not use to much oil.

• When using multiple cuvettes, they should be indexed and matched, when possible.

CUVETTE
The cuvette is part of the optical system in all measurements. The light reaches the sample by

passing through the cuvette glass. As a result, the measurement can be affected by the glass

imperfections, dirt, dust, scratches, or fingerprints present on the cuvette surface. Special care
must be taken in preparing and handling the cuvette.

SPECIFICATIONS

FNU mode

Range

0.00 to 9.99; 10.0 to 99.9; 100 to 1000 FNU

Resolution

0.01; 0.1; 1 FNU

Accuracy

±2% of reading plus straylight

FAU mode

Range

10.0 to 99.9; 100 to 4000 FAU

Resolution

0.1; 1 FAU

Accuracy

±10% of reading

NTU ratio mode

Range

0.00 to 9.99; 10.0 to 99.9; 100 to 4000 NTU

0.00 to 9.99; 10.0 to 99.9; 100 to 980 EBC

Resolution

0.01; 0.1; 1 NTU

0.01; 0.1; 1 EBC

Accuracy

±2% of reading plus straylight

±5% of reading above 1000 NTU

NTU non ratio mode

Range

0.00 to 9.99; 10.0 to 99.9; 100 to 1000 NTU

0.00 to 9.99; 10.0 to 99.9; 100 to 245 EBC

Resolution

0.01; 0.1; 1 NTU

0.01; 0.1; 1 EBC

Accuracy

±2% of reading plus straylight

Range selection

Automatic

Repeatibility

±1% of reading or straylight, whichever is greater

Stray Light

< 0.1 NTU (0.05 EBC)

Light Detector

Silicon Photocell

Method

ISO 7027 Method

Measuring mode

Normal, Average, Continuous.

Turbidity Standards

<0.1, 15, 100, 750 FNU and 2000 NTU

Calibration

Two, three, four or five-point calibration

Light Source

IR LED

Lamp life

Instrument life

Display

40 x 70mm graphic LCD (64x128 pixels) with backlight

LOG Memory

200 records

Serial Interface

USB

Environment

0°C (32°F) to 50°C (122°F); max 95% RH non-condensing

Power supply

12 Vdc power input

Dimensions

230 x 200 x 145 mm (9 x 7.9 x 5.7”) L x W x H

Weight

2.5 Kg (88 oz.)

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