Hanna Instruments HI 96831 User Manual

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• Handle instrument carefully. Do not drop.
• Do not immerse instrument under water.
• Do not spray water to any part of instrument except the “sample well” located over the prism.
• The instrument is intended to measure ethylene glycol solutions. Do not expose instrument or

prism to solvents that will damage it. This includes most organic solvents and extremely hot
or cold solutions.

• Particulate matter in a sample may scratch the prism. Absorb sample with a soft tissue and

rinse sample well with deionized or distilled water between samples.

• Use plastic pipettes to transfer all solutions. Do not use metallic tools such as needles, spoons

or tweezers as these will scratch the prism.

• Cover sample well with hand if measuring in direct sun.

MEASUREMENT GUIDELINES

CALIBRATION PROCEDURE

Calibration should be performed daily, before measurements are made, when the battery has
been replaced, between a long series of measurements, or if environmental changes have
occurred since the last calibration.
1. Press the ON/OFF key, then release. Two instrument test screens will be displayed briefly;

all LCD segments followed by the percentage of remaining battery life. The meter will then
briefly display an indication of the measurement unit set. When the LCD displays dashes, the
instrument is ready.

2. Using a plastic pipette, fill the sample well with distilled or deionized water. Make sure the

prism is completely covered.

Note: If the ZERO sample is subject to intense light such as sunlight or another strong source,

cover the sample well with your hand or other shade during the calibration.