KERN ORA 10 BB Operating Manual

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KERN ORA 10 BB Operating Manual Manual pdf 8 page image

ORA_10_18_20_32_80BB-BA-e-1510 87.1 Zero point calibration Hold up the refractometer against a sufficiently bright light source and lookthrough the eyepiece [5], holding the rubber eyeshade [4] closely against youreye/glasses. Rotate the eyepiece [5] to adjust it for your eyesight, until you can see thescale sharply. Open the prism cover [1]. Thoroughly clean the prism [2] and the underside of the prism cover [1] usinga soft cloth or soft paper (with alcohol if necessary) and wipe dry. Watershould only ever be applied to the measuring prism, not to other parts of thedevice. Now apply a few drops of the calibration liquid [10] onto the prism surface [2]. close the prism cover [1]. The amount of fluid should be sufficient to moistenmost of the prism surface. There should not be any air bubbles between themeasuring prism [2] and prism cover [1]. Wait about 30 seconds to allow the temperatures of the test fluid and prism toequalise. Look through the eyepiece [4] while pointing the refractometer's prism surface[2] at a bright light source. Through the eyepiece [4], you will see a bright and a blue field. The boundaryline between them shows the refractive index value on the scale which is alsovisible through the eyepiece [4]. Use the supplied adjustment tool [11] to turn the adjustment screw [3] behindthe prism surface [2] (under the rubber cap), and adjust the scale so that themeasuring device is optimally set up. The bright/dark boundary line should beat 0% Brix. For refractometers which are not adjusted at 0% Brix using distilledwater and have a special calibration liquid, set the bright/dark boundary line tothe calibration line in the field of view. The room temperature must be +20 °C. For refractometers without automatic temperature compensation (ATC): Con-vert the measured value to take account of the deviation in room and sampletemperature from +20 °C. (See the table at the end of this manual, Point 13.) Repeat step 4 (cleaning).Important!The ambient/room temperature and the sample temperature influence the refracto-meter measuring result.The scales are designed for an ambient temperature of +20 °C!If the measurements are carried out at a temperature other than +20 °C, the resultsmust be correspondingly corrected.A correction table can be found in the annex, Point 13.