Zebra Refractometer Manual Correcting for Temperature If, during concentration measurement, the temperature is above or below 10°F to that of the temperature during calibration, it is recommended to recalibrate the unit at the testing temperature. Two instrument test screens will be displayed briefly; an “all segment” screen followed by the percentage of remaining battery life. 1. NBS Handbook 145, 1986, Handbook for the Quality Assurance of Metrological Measurements, by John K. Taylor, and Henry V. Oppermann is out of print and the majority of content has been updated and published in the publications noted below. This procedure is applicable to calibrate the refractometer, installed in the quality control department. Note any patterns present and the overall accuracy. While looking into the eyepiece, turn the Calibration Screw (on the top of the refractometer) until the boundary between the upper blue field and the lower white field meet exactly on the 0.0° line. NBS Handbook 145, 1986, Handbook for the Quality Assurance of Metrological Measurements, by John K. Taylor, and Henry V. Oppermann is out of print and the majority of content has been updated and published in the publications noted below. Refractometer Calibration. The MA887 refractometer is an optical device that is simple and quick to use. Turn on the light source. your calibration test kit. Focus the refractometer until the scale is clearly visible. 2. Turn the refractometer scale knob to get the clear interface between the illuminated and dark regions. Share sensitive information only on official, secure websites. using Virkon spray and a paper towel or disinfectant wipe 3. A refractometer is a laboratory or field device for the measurement of an index of refraction (refractometry).The index of refraction is calculated from Snell's law while for mixtures, the index of refraction can be calculated from the composition of the material using several mixing rules such as the Gladstone–Dale relation and Lorentz–Lorenz equation Bring the reading setting to 1.3325 … endobj The concentration calibration of the K-Patents PR-43-A refractometer is organized in three (3) layers: the Refractometer nD calibration, chemical curve and field calibration. These customers know that 0.0002 Urine SG accuracy must be validated regularly and Rudolph’s J57 refractometer ensures that the refractive index performance and calibration … A .gov website belongs to an official government organization in the United States. After this calibration procedure, your instrument is calibrated for the current ambient room temperature. Note the temperature at the time of readings. endobj Testing wort with the refractometer It’s fairly easy to use a refractometer, it’s largely the same process as setting up for calibration. 1. Refractometer and Polarimater Calibration From Bellingham + Stanley AG Fluids They are ideal for calibrating refractometers that have temperature control in both food and industrial applications as well as instruments that have AG Fluid temperature compensation, such as the OPTi digital hand held refractometers and RFM700 Series refractometers. There are also quite a number of new GLPs, GMPs, and SOPs that were not originally part of Handbook 145. Repeat the experiment with different liquids and study the variation of refractive inde… Calibration To properly maintain the accuracy of the Mark III refractometer, calibration of the instrument on a routine basis is recommended. 14 MA887 Refractometer 7. However, the organization of the sections and procedures on this and linked pages follows the format of the original Handbook 145, Table of Contents. 6. Two instrument test screens will be displayed briefly; an “all segment” screen followed by the percentage of remaining battery life. 1. Individual sections and procedures are provided to enable periodic updates of selected content as needed and to provide downloadable copy for laboratories to review, modify, and implement as needed and as appropriate. %µµµµ 2. 2. Using a Refractometer 1. Calibration. The instrument should be checked by determining the Refractive Index of distilled water at 25 o C. If the refractive index of distilled water at 25 o C is not between 1.3320 – 1.3330, adjust the small square screw and at the back of telescope with the key provided with instrument. There are many updated GMPs, GLPs, and SOPs in the following publications that were originally published in HB 145; only updated versions are provided here when available. %PDF-1.5 To find the correct part number to order calibration for your MISCO refractometer: 1.) 3 0 obj 7.0 Installation Procedure 7 7.1 Set Up 8 8.0 Sample Reading 10 9.0 Menu Options 11 10.0 Daily Single Point Calibration 12 11.0 Multipoint Calibration 13 11.1 Calibration Oils 14 12.0 Channels 15 12.1 Channel 1 – Brix (Sucrose per ICUMSA) 15 12.2 Channels 2 – 4, … This creates a range of incidence angles, some of which (those less than the critical angle) will be completely reflected. Wipe off prism surface located at the bottom of the sample well. Using a plastic pipette, drip sample onto the prism surface. Clean the refractometer by rinsing it with water and drying it with a clean paper towel … <> CALIBRATION PROCEDURE Calibration should be performed daily, before measurements are made, when the battery has been replaced, or between a long series of measurements. ) or https:// means you've safely connected to the .gov website. Temperature of the sample can be varied by using the slider. If dusty, rinse with water and wipe with a clean, soft, lint-free cloth. Then adjust the unit’s calibration screw so that the refractometer reads exactly zero. Alternatively, the Performance line is ideal for quality control on a … CALIBRATION PROCEDURE Calibration should be performed daily, before measurements are made, when the battery has been replaced, or between a long series of measurements. HB 145 was developed as a source of calibration procedures for weights and measures laboratories and covered mass, length and volume calibrations for field standards used in the commercial marketplace. Press the ON/OFF key, then release. A refractometer consists of a light source, filtered to a single wavelength, which is directed towards the prism-sample interface by a converging lens. Operate the instrument as mention in the operation procedure. Inspect the refractometer prism for scratches, chips, separations or other aberrations that may interfere with proper readings (Fig. 3. 7. xœÍ][SÛÈ~§Šÿ0/[eo˜«. It is a good practice to verify that you have the latest version of a procedure by checking this site on a periodic basis. Level I and II certifications differ only in the amount of documentation you require. The J357 offers 1 point, 2 point or a full multi-point calibration. Fill the well completely. Hold the refractometer with the daylight plate facing upward, direct it towards the light and observe the field of view through the eyepiece. Official websites use .gov Steps for Calibration 1. MEASUREMENT PROCEDURE Verify the instrument has been calibrated before taking measurements. 3.0 RESPONSIBILITY 3.1 Doing: Technical Assistant 3.2 Checking: Executive /Manager 4.0 ACCOUNTABILITY Head of the Department 5.0 PROCEDURE Frequency: Once in three months. checks, calibration verification, use, and preventive maintenance of 20 types of commonly used general laboratory equipment and follows the overall equipment management guidance provided in CLSI document QMS13. {RÔ1`oC°7©S›}X€+¾°² Å¿?Ó-ÁfñLŒ¡e›’¬¯{._÷LOÏìµòbx•^ìÝ»½VQ¤—7ـý¹×ŸÞþµ×¸ÍöÎÒëá$-†ÓÉ^ïK²tåûûìàèý½½Å?‰Œ³ÐþŽÉòl{ë˯l²½uÐßÞÚ;Lð ‰Yÿj{KØç8,²j˜õÇö™÷½ˆ]ÏìûØ5þWÿ½ßÞú³Ñ+ÒÉ ÍÍÝ°ÁNo³. Samples are measured after a simple user calibration with steam… Regardless of how many times the refractometer has been calibrated, it can always be restored to the initial factory calibration if required. First, determine whether you need a Level I or Level II Certification and use the chart below. <>/ExtGState<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/Annots[ 18 0 R 19 0 R 20 0 R 21 0 R 23 0 R 24 0 R 26 0 R 27 0 R 28 0 R 30 0 R 31 0 R 33 0 R 34 0 R 35 0 R 36 0 R 45 0 R] /MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> Read the index of refraction using the telescope scale. Procedure . Prior to calibration, it is extremely important to completely clean the prism surfaces so no sample residue is present. The average value of all your samples is the final wort correction factor. Available in 30 ml sealed bottles with Brix values from 5%Brix to 60%Brix (approximately 1.34 to 1.44 RI), accuracy from 0.02%Brix to 0.1%Brix, depending on value. Most ATC refractome- stream 1. 3. The Good Laboratory Practices (GLPs), Good Measurement Practices (GMPs), and Standard Operating Procedures (SOPs) that have not been updated are available on the linked pages as scanned PDF copies and are dated 1986. 2.0 SCOPE This SOP is applicable for operation and calibration of Refractometer. Note: NIST Interagency or Internal Reports (NIST"IR") can be obtained by going to the Weight and Measures Publications page. Whether you’re looking for UKAS certified AG fluid, sucrose solution, replacement refractometers flaps, optical refractometer contact liquid or an inexpensive carry case for your digital refractometer, this is the area for you. An official website of the United States government. The J-Series Refractometer is chosen by more toxicology labs than any other brand. Now you are ready to sample your wort. Clean any equipment contaminated with blood e.g. The right refractometer for your needs. 5.1 Operate the instrument as per S.O.P. Webmaster | Contact Us | Our Other Offices, Created October 6, 2009, Updated May 31, 2019, Manufacturing Extension Partnership (MEP), New and Existing Resources for Continuing Education and Training, How to Reset Password Using the Contacts System (PDF), Quick Guide for OWM Contacts System (PDF), How to Request Publications using OWM Contacts System (PDF), How to Request Training & Transcript Using the Contacts System (PDF), The National Conference on Weights and Measures (NCWM), Section 1, Introduction (Legacy Handbook 145), Section 2, Concepts of Accuracy and Precision and Statistical Control (Not Current, Handbook 145), Section 3, Quality Assurance in a Metrology Laboratory (Superseded by, Section 7, Miscellaneous Subjects (Legacy Handbook 145), Section 8, Statistical Techniques (Updated in NISTIR 6969, 2019), Section 9, Reference Tables (Updated in NISTIR 6969, 2019). <>>> Calibration can be done at 20°C, 25°C or any user selectable temperature within the available range. 2 0 obj https://www.nist.gov/pml/weights-and-measures/laboratory-metrology/calibration-procedures. Press the ON/OFF key, then release. 2. 3.0 RESPONSIBILITY Officer/ Executive - Quality Control 4.0 ACCOUNTABILITY Manager - Quality Control 5.0 PROCEDURE 5.1 Operations 5.1.1 Ensure that the instrument is free from dust. A lock ( LockA locked padlock read more Check the calibration at different temperatures of the refractometer to determine if the ATC is working. Anton Paar’s Abbemat refractometer series ranges from the straightforward Abbemat 3X00 series for routine analysis to the sturdy Heavy Duty line for measurements in harsh environments. Hold the instrument toward a source of light and read the value directly from the specific gravity scale. To describe the procedure for operation and calibration of Refractometer. Choose the liquid sample. Secure .gov websites use HTTPS Water is used first to calibrate the instrument. Dispose of any glass in a sharps bin 2. Refractometer calibration and accessories At Refractometer Shop we have a range of calibration materials and accessories to help keep your refractometer in tip-top shape. To switch the views of the equipment, click the left and right arrows on the bottom of the simulator. Section 10, Glossary (Out of date; use the International Vocabulary of Metrology, Section 11, Bibliography (Legacy Handbook 145). <> 5. LIQUID REFRACTOMETER STANDARDS with UKAS Certificates of Calibration (UKAS IS the United Kingdom Accreditation Authority) General purpose standards with shelf life of 12 months. …The digital refractometer eliminates the uncertainty associated with mechanical refractometers and is easily portable for ship, shore or home use. Make sure the prism and sample well are completely dry. Any residue on the prism surfaces will adversely affect the accuracy of the calibration. Calibration is the indispensable and documented proof that a measuring instrument works reliably in the intended value range while maintaining specified tolerances under the current operating conditions. The original Table of Contents and several Legacy sections are provided here as reference only. 1. 4 0 obj endobj 1 0 obj NOTE: OPT10 and OPT32 models are temperature stabilized within a 18°F range. 4. Place a drop of urine in the designated spot on top of the refractometer. 9). Calibration is becoming an increasingly important part of quality assurance in terms of meeting standards and regulations. Calibration of the refractometer Equip with refractometer Open light plate and place 2-3 drops of distilled water on main prism like the measurement of honey, the water must spreads across the prism.
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