ATAGO NAR-2T Instruction Manual
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ATAGO NAR-2T Instruction Manual

Abbe refractometer
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1220-E28
Abbe Refractometer
Instruction Manual
Cat.No.1220
PRODUCT REGISTRATION & WARRANTY CARD
https://www.atago.net/registration/
english/registration.php

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  • Page 1 1220-E28 Abbe Refractometer Instruction Manual Cat.No.1220 PRODUCT REGISTRATION & WARRANTY CARD https://www.atago.net/registration/ english/registration.php...

  • Page 2: Table Of Contents

    Page Precautions for use Refractive Index and Brix Unpacking and Setting-up Names and Functions of main parts (1) Main unit of NAR-2T (2) Digital thermometer (3) How to use Illuminator Selector Switch Preparation for measurement (1) Preparation of refractometer (2) Connection with circulating constant temperature bath...

  • Page 3: Precautions For Use

    This operation manual describes the items which you are required to observe in order to use the NAR-2T safely to prevent injury to you and other people and damage to your property. The explanation of the indications and symbols of those items are as follows. Understand them first and then read the following pages to use your NAR-2T correctly.
  • Page 4 Fire or malfunction may result if the instrument is continued to be used. Ask your ATAGO distributor for an inspection. Do not attempt to repair, modify, or If the instrument is dropped or is subjected disassemble the instrument yourself.
  • Page 5 The prism mounted on the sample stage that is in contact with a sample under measurement is a consumable item. Ensure that if use of the instrument has undesired effects on the consumption of the measured materials, etc., ATAGO shall not be held responsible for the result.
  • Page 6 For a new power cable, contact your ATAGO distributor. CAUTION Be sure to hold and pull the plug when Do not insert or disconnect the power disconnecting the power cable from the plug with wet hands.
  • Page 7 1. Precautions for use Connection of circulating constant temperature bath WARNING For connecting a circulating constant Pay careful attention to hot circulating temperature bath with the refractometer, water. make sure to use the elicon tube (made of vinyl chloride). Moreover, tightly fasten each joint part between the nozzle and tube with the tie band.
  • Page 8 1. Precautions for use Items to be observed when using Environmental conditions Use the instrument at an altitude below 2,000m (above sea level). Use the instrument indoors. Use the instrument on a flat and level surface such as a desk or table. Use the instrument where the temperature is between 5 to 40 .

  • Page 9: Refractive Index And Brix

    3. Brix scale The scale of the NAR-2T is a Brix scale that is based on the Refractive Index of water (nD=1.33299=Brix 0.0%). Brix means the scale of the weight (%) of sucrose (grams of sucrose contained in 100 grams of sucrose solution). Thus, if a sucrose solution is measured, it matches this concentration.

  • Page 10: Unpacking And Setting-Up

    Take all contents out of the packing case and check every item whether there is any damage exteriorly or not. Confirm the contents so that the following articles have been contained in the package without lack. ●Abbe Refractometer NAR-2T (main unit)………………………………1 ●Digital thermometer………………………………………………………………1 ●AC Power cable……………………………………………………………………1 ●Lamp cable(LED lamp : 2)…………………………………………………1 ●Test piece………………………………………………………………………1...

  • Page 11: Names And Functions Of Main Parts

    4. Name and functions of main parts (1) Main unit of NAR-2T (Figs. 4-1, 4-2 and 4-3) a) Eyepiece The field of refraction view and the field the secondary prism can be detached of scale view can be observed through from the main prism smoothly without the eyepiece.
  • Page 12 4. Names and Functions of main parts g) Thermo-sensor l) Calibration screw (scale adjustment) The thermo-sensor that is screwed in the The head of the calibration screw is main prism from the side always seen in the center of this metal ring measures the temperature of the main (calibration section).

  • Page 13: Digital Thermometer

    0 When you can not specify the problem with the information above, please contact your ATAGO distributor.

  • Page 14: Preparation For Measurement

    5. Preparation for measurement (1) Preparation of refractometer WARNING ● Don't plug the power cable into an outlet of specified mains supply of AC100 to 240V. Otherwise, it may cause smoke, fire or serious damage to the refractometer. ● If the power cable (plug) is damaged, modified, or broken, don't use it. If such a cable (plug) is used, it may cause electric shock or fire.
  • Page 15 To AC outlet Circulating constant Contact temperature bath liquid *Water *Alcohol Test piece *Sample *Note Digital thermometer Refractometer Fig. 5-3 Note : The articles marked with asterisk (*) are not supplied as accessories to NAR-2T.

  • Page 16: Connection With Circulating Constant Temperature Bath

    5. Preparation for measurement (2) Connection with circulating constant temperature bath WARNING Pay careful attention to hot circulating water. For connecting a circulating constant temperature bath with the refractometer, make sure to use heat-resistant flexible tube which can stand at 150 or higher.
  • Page 17 For fastening the tube with a tie band again, use a new tie band. Fig. 5-8 Tie bands can be ordered through your ATAGO Distributor (refer to page 43). Reference temperature of circulating constant temperature bath When the circulating constant temperature bath is used, there is a difference in temperature indication between the circulating constant temperature bath and the refractometer.

  • Page 18: Power-On

    6. Power-on WARNING Be sure to use the power cable accompanying the main unit. Do not plug the power cable into any electrical outlet other than AC100 to 240V. Do not use a power cable that is cut, damaged or processed. CAUTION Plug the AC power cable into an indoor AC100 to 240V power outlet.

  • Page 19: Calibration (Scale Adjustment)

    7. Calibration (Scale adjustment) CAUTION Don't wet the refractometer except the prism surface with water or sample liquid unreasonably. If the refractometer gets wet excessively, it may cause malfunction and breakdown of the refractometer. Don't tap or pick at the prism surface with a metal spoon, tweezers, etc. because the prism surface is made of optical glass.
  • Page 20 7. Calibration (Scale adjustment) Seeing the field of refraction view, the Turn the measurement knob again so colored boundary line is observed near that the scale reads 1.3330 (When the the intersection of the cross hairs. Turn temperature is other than 20 , the scale color compensator knob...

  • Page 21: Calibration With Test Piece

    7. Calibration (Scale adjustment) (2) Calibration with test piece test piece monobromo- naphthalene which are supplied as Test piece accessories to the refractometer are used for this calibration method. Open the secondary prism completely as shown in Fig. 7-3. Light After wiping down the surface of the main prism and test piece, apply a very Fig.
  • Page 22 7. Calibration (Scale adjustment) If the test piece fails in close contact with the prism surface, remove it once and again try to do same work after Refraction view carefully cleaning both the surfaces of the test piece and the main prism with tissue moistened with alcohol.
  • Page 23 7. Calibration (Scale adjustment) Again turn the measurement knob to adjust the scale indication so that it corresponds to the Refractive Index shown on the test piece. Then, adjust the calibration screw located in the center of the calibration section with a screwdriver so that the boundary line appearing in the field of refraction meets the intersection of the cross hairs (Fig.

  • Page 24: Measurement Of Liquid Sample

    8. Measurement of liquid sample WARNING When using this instrument for measuring matters harmful to humans, very carefully do it with gloves and proper mask as well as with a good knowledge of the characters of the matters. When the refractometer smells nastily, smokes or is overheated, immediately turn it off with the power switch and unplug the power cable from the outlet.
  • Page 25 8. Measurement of liquid sample While observing through the eyepiece, Caution on measurement of liquid gently turn the measurement knob sample until the boundary line appears in the Since measured value for liquid sample field of refraction view. At that time, changes depending on change of the boundary line may be colored and temperature, it is advised to use a...

  • Page 26: Measurement Of Solid Sample

    9. Measurement of solid sample CAUTION After measurement finishes, wipe up wet and soiled parts of the instrument with tissues moistened with alcohol or neutral detergent. Moreover, wipe down the whole instrument with dry tissues to remove moisture completely from it. For measuring solid samples, use contact liquid, the test piece set or/and polarizing eyepiece depending on the situation.
  • Page 27 9. Measurement of solid sample (1)-2 Choosing contact liquid For measuring a solid sample, it is required to use contact liquid proper to the sample to make close contact between the sample and the prism. The Refractive Index of contact liquid must be higher than that of the sample.
  • Page 28 Note: When using D-line lamp for measurement, set the color compensation knob to "30" of scale value of the color compensation knob NAR-2T. Note: In the case of using LED lamp (approximating to wavelength of D-line) of NAR-2T, turn the color compensator knob and stop turning when the boundary line becomes...

  • Page 29: Measuring Film Samples

    Test piece E (nD=1.92) Fig. 9-4 Test piece (nD=1.740) recommended for the NAR-2T. Note: Choose a contact liquid, (2)-3 Mounting sample on main prism refer to (1)-2 on page 26. As shown in Fig. 9-4, a film sample must be...
  • Page 30 Note: In the case of using LED lamp clear because intense (approximating to wavelength of illumination of the lamp, shake D-line) of NAR-2T, turn the color the light with white thin paper compensator knob stop or tissue paper by inserting it...

  • Page 31: Measuring Of Double Refraction Samples

    The samples which have double Refractive Index can be measured by attaching the polarizing eyepiece to the NAR-2T. The polarizing eyepiece can be turned to change the direction of polarization, which is indicated by the dot as shown in Fig. 9-13 on page 32.
  • Page 32 9. Measurement of solid sample (3)-3 Attaching polarizing eyepiece to NAR-2T Remove the rubber hood (Fig. 9-7). Loosen all 4 screws, then pull up and remove the part (Fig. 9-8). Fig. 9-7 Fit the eyeypiece (Fig. 9-9) comes with the...
  • Page 33 Note: In the case of using LED lamp (approximating to wavelength of D-line) of NAR-2T, turn the color compensator knob and stop turning when the boundary line becomes...

  • Page 34: Measurement Of Powdered Sample

    10. Measurement of powdered sample CAUTION After measurement finishes, wipe up wet and soiled parts of the instrument with tissues moistened with alcohol or neutral detergent. Moreover, wipe down the whole instrument with dry tissue to remove moisture completely from it. Refractive indices of powdered samples d) Carefully pour the other liquid (n2) shall be measured by such an indirect...
  • Page 35 10. Measurement of powdered sample Principle of measurement of powder's Refractive Index and cautions on measurement When powder is mixed in liquid, if the refractive indices of the powder and the liquid are different from each other, there occurs irregular reflection on the powder surface and the powder can accordingly be recognized by the eye (Fig.

  • Page 36: Situations That May Require Additional Attention

    Heavily discolored surfaces may not be When the sample is colored thick, removed with this method. Please there is the reflecting measurement contact your ATAGO distributor. method as a means to measure (3) Measurement method of such the sample. pasty sample...

  • Page 37: For Measuring Liquid Sample Containing Insoluble Solids

    11. Matters that require attention to Abbe Refractometer (4) For measuring liquid sample c)-1 Directly measure a sample of bean jam containing insoluble solids for Brix(%) and note the measured (Simultaneous analysis of value as "A". insoluble solids, sugar and c)-2 Mash and knead the bean jam well, and water)

  • Page 38: Finding Average Dispersion Value And Abbe Number

    The Abbe Refractometer NAR-2T is capable of measuring average dispersion value (nF-nC). For details, refer to page 38. However, the NAR-2T is incapable of measuring Refractive Index with other light sources of different wavelengths such as nF and nC.
  • Page 39 12. Finding average dispersion value and Abbe number Note: When measuring a sample to calculate the Abbe value, be sure to use the natural light (white light) instead of the accompanying illuminator lamp (orange light). 2. Finding average dispersion 4. Example of measurement value Refractive Index (nD)=1.4827 Dispersion value (nF-nC) can be found...
  • Page 40 12. Finding average dispersion value and Abbe number 6. Finding value more accurately Turn the color compensator knob clockwise until the boundary line is achromatized, and read the indication of the dispersion scale at the time. Next, turn the color compensator knob counterclockwise until...
  • Page 41 12. Finding average dispersion value and Abbe number Table 1 Relation between nD and A,B Difference Difference 1.30 0.02407 1.30 0.03291 1.31 0.02402 1.31 0.03277 1.32 0.02397 1.32 0.03261 1.33 0.02392 1.33 0.03244 1.34 0.03225 1.34 0.02387 1.35 0.02382 1.35 0.03205 1.36 0.02377...
  • Page 42 12. Finding average dispersion value and Abbe number Table 2 Relation between Z and Z = Scale indication of the color compensator knob 30.0 0.000 35.0 0.259 40.0 0.500 45.0 0.707 50.0 0.866 55.0 0.966 30.1 0.005 35.1 0.264 40.1 0.505 45.1 0.711...

  • Page 43: Cleaning And Maintenance

    13. Cleaning and maintenance With completion of measurement, When the refractometer is left in wipe the sample out of the prism measuring site surface and its periphery with soft connected with constant tissues moistened with water. Then, temperature circulating bath, wipe wipe them up again with dry up not only the refractometer but tissues...

  • Page 45: Replacement Of Consumable Supplies And Component Parts

    Make sure to replace the prism with a genuine prism as specified by ATAGO. Since the NAR-2T's main and secondary prisms are assembled in a unit, they will be replaced together as a unit of prism assembly.
  • Page 46 14. Replacement of consumable supplies and component parts Remove the main and secondary prism unit upwards together with the plate A and Plate B plate B (Fig.14-3). Note: If the part that is exposed after removing the prism is dirty, wipe it down with soft tissues moistened with ethyl alcohol or neutral detergent.

  • Page 47: Led Lamp

    14. Replacement of consumable supplies and component parts (2) LED lamp CAUTION When replacing the illuminating lamp, not only turn off the power switch but also disconnect the power cable from the AC outlet starting replacement work. Don't touch the plug with wet hand. When disconnecting the power cable from the outlet, make sure to do it by holding the plug.

  • Page 48: Thermo-Sensor Unit

    14. Replacement of consumable supplies and component parts (3) Thermo-sensor unit Disconnect the connector from the digital thermometer. Remove two Philips (+) screws from the cable clamp with a Philips screwdriver (Fig. 14-6). Open the secondary prism and turn the metal base of the thermo-sensor unit counterclockwise (with the 5mm wrench supplied with the thermo-sensor unit) to...

  • Page 50: Relation Between Brix Percent And Refractive Index (Nd)

    Further, Refractive Index for Brix 85 to 95% in the above table have been used in the scale of ATAGO Abbe Refractometers for many years, and the values approximately correspond to the Refractive Index values for Brix 85 to 95% in the reference table which ICUMSA...

  • Page 51: Temperature Correction Table For Sucrose Solution

    16. Temperature correction table for sucrose solution This table gives mass fraction corrections to refractometric tables for sucrose solutions at 589nm for temperatures different from 20 . Tempe- Measured Sucrose (mass fraction) rature -0.29 -0.30 -0.32 -0.33 -0.34 -0.35 -0.36 -0.37 -0.37 -0.38...

  • Page 52: Specifications

    17. Specifications NAR-2T Model Measurement Refractive Index(nD) : 1.3000 to 1.7000 range Brix : 0.0 to 95.0％ Refractive Index(nD) : 0.001 Minimum scale Brix : 0.5% Refractive Index(nD) : ±0.0002 (at 20℃) Measurement accuracy Brix : ±0.1% (at 20℃) Average dispersion...

  • Page 53: Repair And Warranty

    Performance part are available through your ATAGO distributor. Recommendation of periodic inspection and maintenance (Charged) We recommend to have your NAR-2T inspected periodically (once in two years, or so) to ensure years of dependable and accurate use.

  • Page 54: Atago Co.,Ltd. Service Center

    ATAGO CO.,LTD. Service Center ATAGO has Authorized Service Centers around the world. Below is the list of countries where you can find an ATAGO Authorized Service Center. If your ATAGO instrument requires servicing please contact ATAGO at the following e-mail address.
  • Page 55 Headquarters : The Front Tower Shiba Koen 23rd Floor 2-6-3 Shiba-koen, Minato-ku Tokyo 105-0011, Japan TEL: 81-3-3431-1943 FAX: 81-3-3431-1945 overseas@atago.net http://www.atago.net/ TEL: 1-425-637-2107 customerservice@atago-usa.com TEL: 91-22-28544915 / 40713232 customerservice@atago-india.com TEL: 66-21948727-9 ,66-21171549 customerservice@atago-thailand.com TEL: 55 16 3913-8400 customerservice@atago-brasil.com TEL: 39 02 36557267 customerservice@atago-italia.com...

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