• Réfractomètre automatique pour les produits pétroliers

Réfractomètre automatique pour les produits pétroliers

Test Method
Refractive index is a fundamental physical property that is used in conjunction with other properties to characterize pure hydrocarbons and their mixtures. It is a useful property for concentration measurements, purity determinations and chemical identification.

Automatic Petroleum Refractometer
  • Conforms to the specifications of: ASTM D1748; FTM 791-5310
  • Capacity: 33 rust test specimens
  • Water Level Control: 8 in. (203mm)
  • Temperature Control Stability: ±2°F (± 1.1°C) (air temperature)
  • Heater Range: 0-1500W
  • Air Metering: 0.878±0.02832m3/h at standard temperature and pressure (31±1 ft3/h)
  • Air Distribution: 20-diffuser manifold
  • Rotating Stage: 1⁄3rpm
  • Electrical Requirements: 115V 60Hz, Single Phase, 13.0A 220-240V 50Hz or 60Hz, Single Phase, 6.8A

The Koehler Automatic Refractometer uses precision optics and superior image analysis to extend the repeatability and accuracy of refractive index measurements for petroleum products. Subjectivity is removed from tests results because no manual activities such as aligning shadowlines or reading analog scales are necessary. Opaque hydrocarbons present no problem for this unit which uses reflected light measurement technology as opposed to manual refractometers which are of the transmission type. The dual temperature control system and flat, easy clean sample area make the instrument ideal for viscous or sticky samples.

Three models are available. Model K27500 conforms to ASTM D1218 (maximum temperature 30ºC) and measures to the fourth decimal place refractive index or tenth place in percent solids. Models K27550 and K27560 conform to ASTM D1218 and D1747 (maximum temperature 100ºC) and measures to the fifth decimal place refractive index or one hundredth place in percent solids. The K27550 also has a built in data storage system with secure electronic signature recording.

The refractometer incorporates numerous innovations designed to improve the accuracy of petroleum product testing. A 589 nanometer filter gives true Sodium D-Line refractive index readings. The large graphical LCD is easy to read and provides complete sample analysis documentation including the reading, temperature and scale name of the screen. Set-up, diagnostic and calibration routines are displayed with easy to follow step-by-step instructions. User-developed customer calibration curves may be programmed allowing automatic temperature correction and direct percent concentration, percent reaction completion, etc. This unit has been used successfully throughout the petrochemical industry.

Measurement Scales
  • Refractive Index (RI)
  • BRIX (% sucrose)
  • Temperature Corrected RI
  • Temperature Corrected BRIX
  • Ten User-Programmable Scales
  • Illumination: 589nm light emitting diode with interference filter (estimated life: 100,000 hrs)
  • Dissolved Solids: 0 to 95% solids
  • Refractive Index: 1.32000 to 1.70000nD for K27500
  • Refractive Index: 1.29000 to 1.70000nD for K27550 and K27560 (nD - Sodium D-Line Refractive Index)
  • Standard Mode: 0.1% Solids 0.0001nD
  • Extended Mode: 0.01% Solids 0.00001nD
  • Standard Mode: ±0.1% Solids ± 0.0001nD for K27500
  • Standard Mode: ±0.02% Solids ± 0.00002nD for K27550 and K27560
  • Extended Display Mode: Refractive Index Standard Oils ± 0.00002
  • Typical clear aqueous samples, % Solids Temperature Compensated,
  • as sucrose ±0.02%
  • Calibration Fluid: refractive index standard oil, NIST traceable
  • nominal value 1.495 RI, 67.61 BRIX
  • Sample Types: Transparent, translucent or opaque
  • Prism Assembly: Stainless steel, synthetic sapphire sealed with
  • solvent-resistant epoxy
  • 1 point - Water only
  • 2 point - Water and refractive index or Brix standard

  • L x W x H, inch (cm)
  • 151⁄2 x 10 x 41⁄2 (391⁄2 x 251⁄2 x 111⁄2)
  • Net Weight: 23 lbs (101⁄2kg)

Shipping Information
  • Shipping Weight: 30 lbs (14kg)
  • Dimensions: 5 Cu. ft.

Ordering Information
Catalog No.  
Automatic Petroleum Refractometer for D1218
110-240V 50/60Hz
Automatic Petroleum Refractometer for D1218 and D1747
110-240V 50/60Hz
Includes data storage
K27560 Automatic Petroleum Refractometer for D1218 and D1747
110-240V 50/60Hz

Calibration Fluid,
Certificate of NIST traceability included.

Refractometer Communication Software Package,
with real-time data export into Microsoft® Excel.