Bellingham + Stanley Digital Refractometer RFM340-M with Peltier Temperature Control and Keypad

Bellingham + Stanley Digital Refractometer RFM340-M with Peltier Temperature Control and Keypad

  • SKU: 19-45
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  • Description

    RFM340-M digital refractometer with 3-decimal / 0-100 Brix (1.58 RI) scales and Peltier control. Perfect for measurement and control in demanding food, beverage, chemical and industrial applications.

    • Tactile & robust keypad

    • Flat prism surface for easy-cleaning

    • Wide beam scan for non-homogenous samples

    • Three decimal place Brix precision* (6 d.p. RI)

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

    With a durable membrane made from chemical and scratch resistant polyester, the RFM300-M offers a more tactile approach, allowing users to navigate menus at the touch of a button.

    The large, clear buttons and 4” high resolution screen help facilitate operation in factory environments, and combined with our latest GUI, help the operator quickly manoeuvre through the menus. On-screen prompts support simple operation such as Method loading, calibration and routine maintenance guiding even the newest member of your staff.

    RFID swipe technology comes as standard, providing clearance and a log of operator and configuration functions; especially useful when being used in FDA regulated environments operating in accordance with 21 CFR Part 11, or where good practice is adopted, e.g. as part of HACCP. 

    Measurements with the RFM300-M are made through a familiar measuring mode or by way of a simple Methods system with one-touch configuration of scale, temperature and data storage, with up to 8000 results being saved alongside pre-set limits that can be used as an audit tool Methods may be user-defined or selected from the on-board library. As an example, the ‘Coffee Solids’ Method allows for coffee type and daily offsets to be inputted, so that the %TS achieved using the refractometer in the factory match the results of the laboratory tests used to configure the freeze-drying process, producing instant coffee powder.

  • Specifications
    Specifications RFM330-M RFM340-M
      Refractive Index
      Sugar (°Brix)

    1.32 – 1.58

    1.32 – 1.58
      Refractive Index
      Sugar (°Brix)

    0.0001 / 0.00001 (selectable) 
    0.1 / 0.01 (selectable)

    0.000001 (selectable up to 6 d.p.)
    0.01/0.001 (selectable up to 3 d.p.)
      Refractive Index

      Sugar (°Brix)



    ±0.00002 (1.32 – 1.38 RI)
    ±0.00004 (1.38 – 1.58 RI)

    ±0.010     (0 – 30 °Brix)
    ±0.030     (30 – 100 °Brix)
    Precision (Reproducibility)
    Refractive Index
    Sugar (°Brix)

    ± 0.00001
    ± 0.01

    ± 0.000005 (6 d.p.)
    ± 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 (dependant 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)
      AG Fluids

    5 – 80 °C
    5 – 40 °C 
    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 Silicon/Resin
    Interfaces 3 x USB (A), 1 x Ethernet, RS232 via USB adaptor (optional accessory)
    Power Instrument: 24 V DC, ±5%, <2A 
    External PSU: 100-240V, 50-60Hz (supplied)
    Humidity Range <90% RH (non-condensing)

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