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Related Manuals for KERN Optics ORA 1 GG
Summary of Contents for KERN Optics ORA 1 GG
- Page 1 KERN & Sohn GmbH Ziegelei 1 Tel: +49-[0]7433-9933-0 D-72336 Balingen, Germany Fax: +49 (0)7433-9933-149 E-mail: info@kern-sohn.com Internet: www.kern-sohn.com Operating manual Analogue refractometer KERN ORA 1 GG Analogue nD Gemology/gemstones Version 1.0 01/2015 ORA_1GG-BA-e-1510...
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Page 2: Table Of Contents
KERN ORA Version 1.0 01/2015 Operating instructions Analogue refractometer Contents Technical data ....................3 Description ..................... 3 General information ..................4 Intended use ..........................4 Warranty ............................ 4 Basic safety information ................4 Follow the instructions in the operating manual ..............4 Warning ............................. -
Page 3: Technical Data
KERN range tions Accuracy Scales 130x20x30mm 0.400 kg ORA 1GG RI: 1.30-1.81 0.01 RI Example scale on the ORA 1 GG 2 Description 1. Illumination aperture with filter 4. Prism 2. Cap 5. Eyepiece 3. Polarisation filter 6. Housing ORA_1GG-BA-e-1510... -
Page 4: General Information
3 General information 3.1 Intended use The refractometer is a measuring instrument for determining the refractive index of gemstones. It is used to observe the behaviour of light as it passes from a prism with known properties to the substance being tested. Use of the refractometer for other purposes is contrary to its intended use and may be hazardous. -
Page 5: Warning
4.2 Warning Do not let acids come into contact with skin or eyes. If acid comes into contact with skin, flush with copious amounts of water. Shower if larger areas of skin are affected. If acid comes into contact with eyes, keep the eyelid open and flush the eye with run- ning lukewarm water from the outer corner to the inner corner. -
Page 6: Use/Measurement
7 Use/measurement The refractometer can be used to quickly and accurately determine the refractive in- dex of gemstones. Please make sure your hands are dry before handling the meas- uring device. Some gemstones are monorefringent, they have only one refractive index. Other gemstones - and actually the majority - have two different refractive indexes. -
Page 7: Calibration With The Calibration Block
Calibration with the calibration block Prior to any kind of measuring operation a calibration of the device has to be done. Please put one drop of the contact-liquid (Alpha-Bromonaphtalene) on the prism [4]. Now put the calibration block with the smooth and polished surface on the prism [4]. Use only slight pressure. - Page 8 Important! After every measurement, use a lint-free, absorbent cloth to remove the fluids from the prism surface [4]. Then carefully clean the prism and prism cover using a cloth moistened with water or if necessary alcohol, and dry both parts using a soft, dry and lint-free cloth.
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Page 9: Cleaning And Maintenance
8 Cleaning and maintenance Clean the refractometer by using a soft, lint-free cloth moistened with water, or if necessary use pure alcohol. Do not use any aggressive or abrasive cleaning agents. Never immerse the device in water or hold it under running water. Never handle the device with wet or damp hands.
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