RFM300-M Series Refractometer

RFM300-M Series Refractometer

The RFM300-M brings our popular RFM300+ refractometer up-to-date with a line of high precision Peltier temperature
controlled benchtop refractometers.

The RFM300-M is identical in features to the recently launched RFM300-T Series in all aspects except for its tactile keypad.
Incorporating wide beam optics and one of the flattest prism platforms on the market, RFM300-M Series refractometers are
capable of measuring non-homogenous samples such as fruit juice with pulp, opaque chemical compounds and emulsions that
are normally difficult to read with optical refractometers or those digital refractometers that do not address the need to measure
“difficult samples.”

The new instrument’s ABS case is ergonomically designed so that any spills are dealt with by its sloping shape or by the PEEK spill
barrier that surrounds the shallow, easy-clean stainless steel prism dish.

SMART temperature stability, RFID user clearance and application specific pre-programmed Methods simplify routine analyses
within soft drinks, food, pharmaceutical and petrochemical industries. Supplied PC software enables control via Ethernet
connection so that technical support and training may be performed remotely, with measurement results being viewed and
exported via USB port in csv file format for PC or LIMS as well as in Secure PDF reports.



  • 4” High definition display with robust push-button keypad for factory use
  • Flat prism surface for easy-cleaning
  • Wide beam scan for non-homogenous samples
  • Three decimal place Brix precision* (6 d.p. RI)
  • D user clearanceRFI
  • Supports FDA regulation 21 CFR Part 11
  • PHR-MEAN Method
  • USB & Ethernet connectivity



Specifications                                         RFM330-M                                           RFM340-M


Refractive Index                                                1.32 – 1.58                                                        1.32 – 1.58

Sugar (°Brix)                                                      0 – 100                                                               0 – 100

User Defined                                                     100                                                                     100



Refractive Index                                                0.0001                                                 0.000001 (selectable up to 6 d.p.)

Sugar (°Brix)                                                      0.1                                                       0.01 / 0.001 (selectable up to 3 d.p.)



Refractive Index                                                ± 0.0001                                              ± 0.00002   (1.32 - 1.38 RI)

                                                                                                                                      ± 0.00004   (1.38 - 1.58 RI)

Sugar (°Brix)                                                      ± 0.1                                                    ± 0.010       (0 - 30 °Brix)

                                                                                                                                       ± 0.030       (30-100 °Brix)

Precision (Reproducibility)*

Refractive Index                                                ± 0.00005                                              ± 0.000005 (6 d.p.)

Sugar (°Brix)                                                      ± 0.05                                                    ± 0.005       (3 d.p.)


User Scale                                                         Library 20+ pre-programmed scales including HFCS (3), sugar (4), sucrose SG (3),                                                                                     NaCl, Butyro, Wine Must (5), Urine SG (3), PHR-MEAN and more; plus customer                                                                                         programmable user scales via PC.

Reading Time                                                    Minimum 4 seconds (dependent on precision required)

Measuring Temperature Range                       0°C or 10°C below ambient whichever is greater to 70°C

Temperature Sensor Accuracy                        ± 0.03 °C

Sample Temperature Stability                          ± 0.05 °C


Temperature Compensation

Sucrose (°Brix)                                                  5 – 80 °C

AG Fluid                                                            5 – 40 °C

User Defined                                                     Simple coefficient (units/°C) or polynomial function


Temperature Stability Checks                          None/delay time/repeatability/Smart (independently selectable by Method)

Sample Illumination                                          Light Emitting Diode 589nm (100,000+ hours)

Prism / Dish                                                       Artificial Sapphire / Stainless Steel 316 / PEEK (spill barrier)

Prism Seal                                                         Silicone/Resin

Interfaces                                                           3 x USB (A), 1 x USB (B), 1 x Ethernet, 1 x Serial (RS232)

Power                                                                Instrument: 24 V DC, ±5%, <2A

                                                                           External PSU: 100-240V, 50-60Hz (supplied)

Humidity Range                                                <90% RH (non condensing)

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