Hanna Instruments HI 96811 - Manual (Page 9)

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CALIBRATION PROCEDURE CALIBRATION PROCEDURE CALIBRATION PROCEDURE CALIBRATION PROCEDURE CALIBRATION PROCEDURE
• 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 grape/wine 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 on 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 MEASUREMENT GUIDELINES MEASUREMENT GUIDELINES MEASUREMENT GUIDELINES MEASUREMENT GUIDELINES
Calibration should be performed daily, before measurements are made, when the battery has
been replaced, or between a long series of measurements.
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. 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.