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ExTech Refractometer Instruction Manual

1. 14 ARA 29 1372 44 1 4077 59 1439 74 AFA 89 15151 Source International Sugar Analysis Committee Warrant EXTECH INSTRUMENTS CORPORATION werrants this instrurrent to be free of defects in parts and workmanship for one year fromdate of shipnrent a six month limited waranty applies on sensors and cables If it should becone necessary to reum the instrurrent for service during or beyond the warranty period contact the Customer Service Departrent at 781 890 7440 et 210 for authorization or visit our website at vwwv extech com dick on Contact Extech and go to Service Departrent to request an RA number A Retum Authorization RA nuntber must be issued before any product is retumed to Extech The sender is responsible for shipping charges freight insurance and proper packaging to prevent damage in transit This warranty does not apply to defects resulting from action of the user such as misuse inqoroper wiring operation outside of specification inqproper maintenance or repair or unauthorized rrodification Extech specifically disclains any implied werranties or rrerchantability or fitness for a specific purpose and will not be liable for any direct indirect incidental or consequential danrages Extech s total liability is limited to repair or replacerrent of the product The warranty set forth above is inclusive and no other warranty whether written or oral is expressed or in plied Manual Version No 2 1
2. taking readings The RF15 makes this correction autorratically When armbient terperature strays from 68 F 20 C readings are autorretically adjusted to conpensate for tenperature variance between 50 F to 86 F 10 C to 30 C The RF 10 Refractorreter has been designed for use with a 20 C standard terpereture Therefore if the tenperature of the measurerrent deviates from 20 C the reading must be manually compensated in accordance wth the Temperature Compensation Table below Exanple A reading of 20 at 28 C is compensated thusly 20 0 62 20 62 Copyright 2005 Extech Instturrerts Corporation All rights reserved including the right of reproduction in whole or in part in any form Temperature Compensation Table Referenced To 20 C esf oss aszfassfosef oso aeo 245 os osof osi osi osef ass 021 021 022 022 023 023 023 Add the following to the neasurerrent 0 07 0 07 0 08 0 08 0 08 0 08 0 08 0 08 0 08 0 08 0 08 0 07 2a 926 029 o 0 53 asal a asl asel asel 56 a56 0 56 0 56 0 55 0 55 0 61 0 62 0 63 0 64 0 64 0 65 0 65 0 64 0 64 0 64 0 64 0 63 a aeae 0 69 073 azorar s0o _075 077 072 079 020 om om 0851 02 081 081 om 080 07 Source Intemational Commission for Uniform Methods of Sugar Analysis 1966 International Brix Scale Brix to Refractive Index nD Conversion Table ve fo vf of no vf no no ro R 1G 2 218 B18 Q 18 18
3. User s Guide EXTECH INSTRUMENTS Brix Refractometers Models RF10 and RF15 with ATC Introduction Congratulations on your purchase of the Extech RF10 or RF15 Brix Refractoneter Precision optical instturrerts should be handled gently avoid touching the optical surface Careful use of these instrurrerts will provide years of reliable service Specifications Range 0 to 32 Brix Resolution 0 2 Dimensions RF10 6 6 x 1 3 x 1 3 168 x 32 x 32mm RF 15 6 3 x 1 4 x 1 4 159 x 35 x 35mm Weight RF 10 3 2 oz 91g RF15 7 oz 200g Description Eyepiece Mirror Tube Adjustment screw Cover Plate OE ee NS S Prism Field of Views ee Operation This instrurrent neasures the refractive index of a sample The neasurement is dsplayed in Brix 1 Zero Adjustment Cover the prismwith distilled weater Several drops wil suffice Close the cover plate and rotate the adjustment screw until the light dark boundary shadowline lines up with the zero line After the zero adjustrrent clean the pismwith a soft doth Sample Preparation and Reading To take a san ple reading sinply place a few drops of a sam pe liquid on the measurerrent prism at the end of the instturrert Close the pism cover plate so that the liquid spreads across the entire surface of the ponni without air bubbles or dry spots see diagram Allow the sample to remain FX a ae on the prism for apporoxirretely 30 While ho
4. lding the instrurrent under a Fi y light source look through the eyepiece The sucrose concentration is detenvined by the intersection of aa the boundary of the light and dark Bad Bad Good fields known as the shadowline on the printed scale If the scale appears out of focus the eyepiece may be adjusted by rotating the knurled portion of the eyepiece The instrurrent also features an eye quard to prevert stray light from entering the eyepiece and causing reflections It may be necessary to adjust the position of the light source to rmaxinize the contrast of the shadowline Under normal conditions optimal contrast is Obtained by holding the instrurrent undemeath and perpendicular to a light source Once a reading has been taken wipe dry with a clean cloth do not wash or rinse and place the instrurrent in the supplied plastic case Store the instrurrent in a safe dry environment Note The Distilled weter tenperature used for zero adjustrent and the sample liquid tenperature should be the sarre If the tenperature of the samples fluctuates zero the refractorreter every 30 minutes RF10 only 3 Temperature Compensation RF15 has Auto Temp Comp Temperature is one of the singe nost inportart factors influendng accurate refractorreter readings ard is one of the largest sources of measurerrent eror Tenperature compensation relieves the user of the responsibility to measure terperature and apply a correction factor when

ExTech Refractometer Instruction Manual

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