Calibrating your Sper Scientific 300069 Clinical Refractometer is crucial for ensuring precise measurements. Here's a straightforward guide to help you calibrate your device:
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Zero Point Calibration:
- Open the COVER PLATE.
- Apply a few drops of distilled water (provided with the refractometer) onto the PRISM platform.
- Close the COVER PLATE.
- Turn the CALIBRATION screw until the boundary line between light and dark aligns with the bottom line of the scale.
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Preparing for Testing:
- Carefully dry both the prism platform and the COVER PLATE after zero calibration.
- Place a few drops of the solution you wish to test onto the prism and close the COVER PLATE, allowing the solution to spread evenly.
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Testing Procedure:
- Point the front of the refractometer towards a light source and focus the eyepiece on the boundary line.
- The boundary line reading indicates the percentage (v/v) of alcohol in your sample at 20°C.
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Post-Testing Care:
- After each use, clean the prism with distilled water and a soft cloth to remove any residue.
- The temperature during zero point calibration should match the temperature of the test solution. If the temperature varies significantly, re-calibrate every 30 minutes.
Additional Recommendations:
- Never submerge the unit or allow liquids to enter the device.
- Clean the refractometer after each use using a soft cotton cloth to avoid scratching the prism surface.
- Store the device in a dry, clean, and non-corrosive environment, protecting it from strong impacts.
Following these steps and precautions will help you achieve accurate and dependable readings with your Sper Scientific 300069 Clinical Refractometer.
