Introduction
An automatic refractometer is an analytical instrument used to measure the refractive index of the liquids and, in some models, the solids, and it is used in the food, the beverage, the pharmaceutical, the chemical, and the many other industries for the measurement of the concentration and the quality of the solutions. The automatic refractometer measures the refractive index of the sample by the measurement of the critical angle of the total internal reflection or by the measurement of the deflection of the light, and it calculates the refractive index, and it may provide the related parameters, such as the Brix, the concentration, and the specific gravity, using the conversion tables; the automatic refractometer performs the measurement automatically, with the sample placed on the prism, and the result displayed, with features such as the automatic temperature compensation, the calibration, and the data management, and it provides a rapid and an accurate measurement, with a small sample volume; the automatic refractometer is used for the measurement of the Brix of the fruit juices and the beverages, for the measurement of the concentration of the solutions, for the measurement of the refractive index of the oils and the chemicals, for the quality control, for the process monitoring, and for many other applications, and it is available as the benchtop and the portable instruments. Automatic refractometers are used in the food and the beverage industry, in the pharmaceutical industry, in the chemical industry, in the petroleum industry, and for many other applications. With their automatic measurement, automatic refractometers are essential for the refractive index and the concentration measurement.
Automatic Refractometer LAR-T2015
Automatic Refractometer features a temperature control range of 5℃ to 85℃, allowing precise temperature sample testing. It provides Peltier temperature control mode for stable sample t...
Automatic Refractometer LAR-T2016
Automatic Refractometer features a brix range of 0 to 100%, making it ideal for measuring sugar concentration in diverse samples for reliable performance. It offers a large data storage ...
Automatic Refractometer LAR-T2014
Automatic Refractometer offers a resolution of 0.0001, ensuring precise measurements in critical applications. The sapphire-grade prism ensures scratch and chemical resistance, durabilit...
Automatic Refractometer LAR-T2013
Automatic Refractometer provides advanced temperature control from 5°C to 90°C, allowing precise high-temperature sample testing. It provides a 1.30000 to 1.70000 (nD) range with 0.000...
Automatic Refractometer LAR-T2012
Automatic Refractometer operates with a built-in Peltier system, ensuring precise temperature control from 5°C to 65°C with ±0.02°C stability. A Brix measurement range of 0 to 100% a...
Automatic Refractometer LAR-T2011
Automatic Refractometer has a temperature compensation range of 5 to 65°C, ensuring precise and stable refractive index readings. It provides a refractive index measurement range of 1.3...
Automatic Refractometer LAR-T2010
Automatic Refractometer features a refractive index range of 1.30000 to 1.70000, ensuring accurate measurements for diverse samples. The device functions at room temperature, making it s...
Standards
ISO 2173:2003-Fruit and vegetable products-Determination of soluble solids content-Refractometric method
Complies with the above standards, but is not limited to them.
Features
1. Automatic refractometer for measuring refractive index and concentration of liquid samples.
2. Digital refractometer with automatic temperature control, LED light source and digital readout.
3. Suitable for food, beverage, pharmaceutical, chemical, petrochemical and quality control laboratories.
4. Includes refractometer unit, prism, sample well, calibration standards, power cord and operation manual.
5. Supports measurement of refractive index (nD), Brix, concentration, density-related parameters automatically.
FAQ
Q1: What testing scenarios is this refractometer mainly applied to?
A: The automatic refractometer is used in food, beverage, pharmaceutical, chemical, petrochemical, and quality control laboratories for measuring the refractive index (RI, nD) of liquid samples, which is converted to concentration (e.g., Brix for sugar, salinity, alcohol, acid concentration) using built-in scales, providing fast, accurate, non-destructive analysis of liquid composition. It supports food and beverage (sugar content (Brix degrees) in fruit juices, soft drinks, honey, jams, syrups, wine (must weight, fermentation monitoring), beer (wort, original gravity), dairy (milk solids, lactose), tomato paste (Brix), coffee/tea extracts, sauces/condiments - quality control, process monitoring, product specification), pharmaceutical (API concentration in solutions, solvent purity (refractive index as identity test per USP <695>, EP 2.2.6), glycerin, propylene glycol, intravenous solutions, eye drops, syrups - QC and raw material testing), chemical (solvent purity/identification (acetone, ethanol, toluene, glycerol - RI is a physical constant for identity), reaction monitoring (conversion via RI change), polymer solution concentration, surfactant concentration, coolant/antifreeze concentration (ethylene glycol, propylene glycol)), petrochemical (fuel/oil refractive index (API gravity correlation, aromatic content), lubricant additives, transformer oil quality, biodiesel (methyl ester content, methanol residual)), and environmental (salinity of water (seawater, brine, wastewater), dissolved solids, coolant monitoring). Automatic refractometer principle: Light (LED, typically 589 nm sodium D-line equivalent or 880 nm IR) passes through a prism and hits the prism-sample interface at various angles. At the critical angle, light is totally internally reflected; below critical angle, light refracts into sample. A CCD/photodiode array detects the boundary between reflected and refracted light (shadow line). Refractive index of sample is calculated from critical angle (Snell law: n_sample = n_prism * sin(critical angle)). Automatic temperature control (Peltier, typically 20.0 or 25.0 C +/- 0.05 C) maintains constant temperature (RI is temperature-dependent, dn/dT ~ -0.0001/ C for aqueous, more for organics). Digital readout in nD (e.g., 1.3330 for water) and/or concentration units (Brix, % w/w, salinity). Accuracy: nD +/- 0.00002-0.0001, Brix +/- 0.01-0.05%. Compare to handheld refractometer (analog, less accurate, no temp control) - automatic is more accurate and reproducible. See 3283 (conductivity) for another liquid property meter.
Q2: What standards does the refractometer comply with?
A: The automatic refractometer follows relevant ISO, ASTM, USP, EP, ICUMSA and GB/T standards including ISO 1743 (glucose syrup - dry matter by refractometry), ISO 2173 (fruit and vegetable products - soluble solids by refractometry (Brix)), ISO 4831 (milk - freezing point - related), ASTM D1218 (refractive index and refractive dispersion of hydrocarbon liquids), ASTM D1747 (refractive index of viscous materials), USP <695> (refractive index - pharmacopeial test for liquids), EP 2.2.6 (refractive index), ICUMSA (International Commission for Uniform Methods of Sugar Analysis - Brix scales), OIV (International Organisation of Vine and Wine - must weight), and GB/T standards for refractometers. The hardware complies with applicable refractive index accuracy (+/- 0.00002-0.0001 nD), temperature accuracy (+/- 0.02-0.1 C at 20/25 C), repeatability, EMC (IEC 61326), and electrical safety (IEC 61010). For food, follow ISO 2173/ICUMSA for Brix (soluble solids), AOAC methods. For pharmaceutical, follow USP <695>/EP 2.2.6 (refractive index as identity/purity test, at specified temp (usually 20 C)). For petrochemical, follow ASTM D1218/D1747. For wine, follow OIV methods. For regulated labs (ISO 17025, GMP), maintain calibration records (refractive index calibration with certified standards (water, standard oils traceable to NIST/PTB), temperature calibration, as-found/as-left data). Calibration standards: distilled water (nD = 1.3330 at 20 C, 1.3325 at 25 C), certified refractive index oils (e.g., Cargille, nD 1.3-1.7), or solid reference (glass prism).
Q3: What is the warranty period for the whole refractometer and key components?
A: The whole automatic refractometer is covered by a 12-24 month warranty (lab instruments often 1-2 years; some 3 years). The unit (optics, prism, Peltier temp control, detector, electronics) and software are covered, while prism (wear - can scratch with improper cleaning; sapphire prism is very durable, glass prism scratches easier), light source (LED lifespan ~50,000+ hours (long, rarely fails)), calibration standards (consumable - certified oils expire/degrade), and sample well seal/gasket (wear - replace if leaking) are consumables/accessories. Damage from improper use, prism scratches (use lens paper, no abrasive; do not use metal tools; scratched prism causes inaccurate readings - may need replacement/repairs), aggressive samples (strong acids/bases, HF can etch glass prism - use sapphire or check compatibility; clean immediately), sample crystallization (sugar/salt crystals can scratch - rinse with water before drying), liquid spills on electronics, Peltier overheating (ensure cooling), or unauthorized repair (optics alignment - only qualified service) is excluded. Extended warranty and service contracts (annual calibration, prism inspection, temp verification) may be available. LED 50,000+ hours (essentially life of instrument); prism 5-10+ years (if not scratched); Peltier 5-10 years; detector 5-10 years. Refractometers are low-maintenance, high-reliability instruments.
Q4: Is this device difficult to operate? Is professional training required?
A: Operation is very simple for lab personnel (apply sample, press measure, read result). No professional training required for basic use. We provide operation manuals and brief training (half day). Proper workflow (turn on and warm up (10-30 min for temperature stabilization at 20.0 or 25.0 C; Peltier needs to stabilize), calibrate (with distilled water (daily, nD = 1.3330 at 20 C) and/or certified RI oil (periodically, for full range); follow manufacturer calibration procedure), prepare sample (ensure homogeneous, no bubbles, at approx measurement temp (or let instrument temp control); viscous samples may need warming to pour), apply sample (place a few drops (0.1-0.5 mL) on prism, ensure full coverage, no bubbles (bubbles cause errors; use enough sample), close sample well cover (if equipped) to prevent evaporation and maintain temp), measure (press read; instrument detects shadow line, calculates nD and/or concentration (Brix, etc.) via built-in scale; 5-30 sec per sample), read/record result (nD and/or concentration, temperature), post-measurement (clean prism (rinse with distilled water or appropriate solvent (ethanol for oils), blot dry with lens paper/lint-free tissue - do not rub hard; do not use Kimwipes on delicate prism? lens paper is safer; ensure no residue), leave cover open or close, maintenance (daily: calibrate with water, clean prism after samples, check temp; weekly: deep clean prism/sample well, inspect seal/gasket, verify temp with certified thermometer; monthly: calibrate with certified RI oil (if high accuracy), inspect optics; semi-annually/annually: professional calibration (RI with certified standards, temperature, full performance), troubleshooting (inaccurate readings (calibration error (recalibrate with water/oil), prism dirty (clean), bubbles in sample (reapply, ensure coverage), temperature not stable (wait for Peltier), sample evaporating (cover well, measure quickly), wrong scale (select correct concentration scale/Brix table), no reading / error (prism not covered (add sample), sample too opaque/dark (refractometers need some light transmission; very dark samples may fail or need dilution), temperature error (Peltier fault - service), LED failure (rare - service), unstable readings (sample evaporating (cover), temperature fluctuating (wait), viscous sample not equilibrated (wait longer), bubbles rising), and safety (TEMPERATURE (Peltier can heat/cool; prism may be at 20/25 C - not hazardous, but some models can do 0-80 C for custom methods - avoid burns at high temp), CHEMICAL (samples may be hazardous (acids, bases, solvents, toxic - know SDS, wear PPE (gloves, goggles); clean spills; dispose waste properly; HF etches glass - do not use glass prism with HF (use sapphire or avoid); strong acids can damage metal sample well), ELECTRICAL (proper grounding, do not spill liquid into instrument, unplug before service), do not use abrasive cleaners on prism (scratches = inaccurate, expensive repair), do not use metal tools on prism (scratch), for volatile samples (ethanol, acetone): measure quickly, cover well, work in fume hood if toxic/flammable, for viscous samples (honey, syrups): warm slightly to reduce viscosity, ensure full prism coverage, no bubbles, for Brix measurement: Brix = % sucrose by weight; for non-sugar solutions (salts, acids), Brix reading is apparent (not true sucrose) - use appropriate concentration scale or nD, for pharmaceutical identity (USP <695>): measure at specified temp (usually 20 C), compare to monograph range, record nD to 4 decimal places, calibration: daily water check is usually sufficient for routine; certified oil calibration monthly/quarterly for high accuracy/GMP, temperature is critical (RI changes ~0.0001 per C for water, more for organics; ensure Peltier at setpoint, sample equilibrated), dispose of samples properly (some are hazardous), clean prism between every sample (cross-contamination causes errors, especially for concentration scales) are important for refractometry.
Q5: What is the typical lead-time for order delivery?
A: Standard models require 7-30 working days. In-stock units can ship within 3-7 working days. Custom configurations or large built-to-order systems may require additional time, and we confirm the exact schedule before order confirmation.
Q6: Is regular calibration required? What is the recommended calibration cycle?
A: Calibration recommended: distilled water check - daily (before use, nD = 1.3330 at 20 C or 1.3325 at 25 C; adjust if off); full calibration with certified refractive index oils (traceable to NIST/PTB, covering measurement range) - every 1-6 months or when water check fails; temperature calibration - every 6-12 months with certified thermometer. Routine checks: water (daily), prism cleanliness (before each sample), and temperature display (weekly). If instrument is moved, prism replaced/repaired, Peltier serviced, or readings drift, recalibrate immediately. For ISO 17025/GMP/pharma (USP <695>) regulated labs, follow applicable schedules and maintain records (calibration certificates, standard ID/expiry, as-found/as-left data, temperature calibration, maintenance logs). For high-accuracy research (nD +/- 0.00002), more frequent calibration (weekly water, monthly oil) and temperature verification. Refractometers are very stable (drift is minimal) but water check is quick and ensures reliability. Certified RI oils should be replaced within expiration (typically 1-2 years, store properly).
Q7: Are supporting consumables universal?
A: Calibration standards (distilled water (universal), certified refractive index oils (Cargille, Rudolf, Atago - universal but use correct range and traceability), prism cleaning supplies (lens paper, isopropyl alcohol, ethanol - universal), sample well gaskets/seals (specific to instrument - use OEM), and printer paper (if built-in printer - universal) are available from lab supply companies, though some seals/gaskets are instrument-specific (use OEM or certified compatible). Long-term consumable cost is very low: calibration oils (periodic, $50-$200/bottle), lens paper, and occasional gasket replacement. Refractometers have among the lowest ongoing cost of lab instruments (no reagents, no lamps to replace frequently (LED long life)).
Q8: Can I customize parameters or supporting accessories?
A: Customization includes accuracy grade (standard (+/- 0.0001 nD, +/- 0.05% Brix) or research/high-precision (+/- 0.00002 nD, +/- 0.01% Brix)), temperature range (standard 15-35 C or 20/25 C fixed; extended 0-80 C or 0-100 C for custom methods; Peltier control), wavelength (single (589 nm sodium D-line, standard) or multi-wavelength (436, 546, 589, 633, 880 nm for refractive dispersion (Abbe number), nF/nC), measurement modes (nD only, Brix, % w/w concentration, custom user scales (enter nD vs concentration table for specific product), salinity, alcohol, API gravity), sample handling (manual (drop on prism) or automated (autosampler for 20-100+ samples, peristaltic pump, flow-through cell for inline/process), features (digital display (LCD/touchscreen), data logging, USB/RS232/Ethernet, LIMS integration, 21 CFR Part 11 compliance, built-in printer, multiple user methods, barcode reader), accessories (calibration oils (certified, various ranges), spare prism/sample well, autosampler, flow-through cell, printer, dust cover, validation package (IQ/OQ/PQ for pharma/food), certifications (CE, ISO 9001, IEC 61010, USP/EP/ASTM compliance, ISO 17025 support), language and accessories. Additional standards and accessories can be ordered separately.
Q9: Does the purchase include on-site installation and commissioning service?
A: Standard delivery includes automatic refractometer, calibration standard (water or oil), power cord, and instruction manual (certified RI oils often NOT included - order separately). On-site installation is not required for standard automatic refractometers (unbox, place on bench, plug in, warm up, calibrate with water, use - very simple). On-site training is not included for standard orders but can be arranged at additional cost (for pharma/food QC teams on GMP calibration, method setup, IQ/OQ). Remote guidance provided. For GMP/pharma-grade or automated systems: on-site installation/commissioning and IQ/OQ may be recommended/required. Always calibrate with distilled water and verify with certified standard before first use.
Q10: What types of samples are compatible with this equipment?
A: The automatic refractometer measures refractive index of various transparent/translucent liquids including aqueous solutions (sugar/syrups, salts, acids, bases), organic solvents (ethanol, methanol, acetone, glycerin, oils), food products (juices, honey, wine, beer, milk, sauces), pharmaceutical solutions (APIs, syrups, solvents), petrochemicals (oils, fuels, biodiesel), and emulsions/colloids (if homogeneous and translucent). NOT compatible with: Opaque/dark samples that do not transmit light (very dark molasses, crude oil, heavily colored samples - may fail measurement or need dilution; some models can handle dark samples with longer measurement but check), solids (refractometer is for liquids; solids need Abbe refractometer with contact liquid or other method), gases, highly viscous samples that cannot cover prism evenly (warm to reduce viscosity, ensure no bubbles), samples that etch/attack prism (HF etches glass - use sapphire prism or avoid; strong alkalis can damage glass over time; check compatibility), samples with particles > wavelength (cause scattering, errors - filter or centrifuge), and samples that crystallize on prism (rinse immediately after measurement). For Brix: measures soluble solids (sucrose equivalent) - for non-sugar solutes, Brix is apparent. For alcohol: ethanol changes RI differently than sugar - use alcohol-specific scale or distill first. For emulsions (milk): homogenize, measure at controlled temp; fat globules can scatter (use appropriate method). Sample volume: 0.1-0.5 mL (few drops) for most; flow-through cells for continuous. IMPORTANT: Automatic refractometer fundamentals: (1) What is it? Measures refractive index (nD) of liquids via critical angle of total internal reflection at prism-sample interface. Converts nD to concentration (Brix, etc.). Fast (5-30 sec), accurate, non-destructive, small sample (drops). (2) Principle: - Light hits prism-sample interface. - At critical angle: total internal reflection. - CCD detects shadow line boundary. - n_sample = n_prism * sin(critical angle). - Peltier controls temp (20/25 C, RI is temp-dependent). (3) Key parameters: - Accuracy: +/- 0.00002 (research) to +/- 0.0001 (standard) nD. - Brix: +/- 0.01% to +/- 0.05%. - Temp: 20.0 or 25.0 C +/- 0.02-0.1 C. - Range: nD 1.30-1.70 (most). - Sample: 0.1-0.5 mL, transparent liquid. (4) Key standards: - ISO 2173 (fruit/veg soluble solids, Brix). - ISO 1743 (glucose syrup). - ASTM D1218 (hydrocarbon RI). - USP <695>, EP 2.2.6 (pharmaceutical RI). - ICUMSA (sugar Brix). - OIV (wine must weight). (5) Applications: - Food: Brix (juice, honey, wine, beer, soda). - Pharma: solvent identity/purity (USP <695>), API concentration. - Chemical: solvent ID, reaction monitoring, concentration. - Petrochemical: oil/fuel RI, aromatic content. - Environmental: salinity, dissolved solids. (6) Calibration: - Daily: distilled water (nD = 1.3330 at 20 C). - Monthly/quarterly: certified RI oil (NIST-traceable). - Temp: 6-12 months. - Very stable instrument, low drift. (7) Common errors: - Not calibrating (water check daily). - Bubbles in sample (reapply). - Prism dirty (clean between samples). - Temp not stable (wait for Peltier). - Volatile sample evaporating (cover, fast). - Wrong concentration scale (Brix for non-sugar = apparent). - Scratching prism (lens paper only, no metal/abrasive). - Dark/opaque sample (dilute or check compatibility). (8) Safety: - Chemical samples (PPE, SDS, waste disposal). - HF etches glass (use sapphire or avoid). - Peltier temp (extended range can be hot/cold). - No reagents needed (low cost). (9) Choosing: - Routine food/beverage QC: Standard Brix refractometer, 20 C, +/- 0.05% Brix. - Pharma: USP <695>, 20 C, high accuracy, IQ/OQ, 21 CFR Part 11. - Research: Multi-wavelength, high precision (+/- 0.00002), extended temp. - High throughput: Autosampler, flow-through. - Petrochemical: ASTM D1218, extended range, temp control. - Budget: Basic automatic (vs handheld analog). This is distinct from 3283 (conductivity meter) - refractometer measures RI/concentration, conductivity measures ionic content.
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