Liquid Handling
134
Calibrex ™ universal 520 Bottle Top Dispensers Designed for performance handling of liquids from a large variety of bottles and flasks, the Calibrex ™ dispensers combine the latest in dosing technology, high-tech materials and ergonomic design. They are manufactured and tested to fully comply with current safety regulations. Three color-coded 520-models with adjustable volumes are available, with ranges of 0.25 - 2mL, 1 - 5mL and 1 - 10mL. Fixed volume dispensers are also available; please contact WHEATON Customer Service.
520 0.25 - 2mL 1 - 5mL 1 - 10mL
Product Advantages ■ Superior chemical resistance ■ Long lasting performance stability ■ Simple construction - no tool for disassembling ■ Instant volume setting ■ In-lab calibration ■ Autoclavable at 121°C/250°F fully assembled ■ Two-year warranty
For Chemical Compatibility see page 137.
Easy Digital Volume Setting Fast and precise volume adjustment. Efficient click-stop mechanism prevents unwanted alteration. Large display is easy to read; the window adjusts to desired side of instrument body. Each step on the cylindrical cam is pre-calibrated and corresponds to one division on the volume adjustment scale. Optimized Working Position The instrument rotates 360° for adequate positioning on top of the bottle. Air Filter Air inlet can be enlarged to receive a membrane filter, if airborne contamination is a concern.
In-Lab Calibration Calibrex ™ dispensers are factory calibrated and can be easily recalibrated by means of a dedicated adjustment screw. Easy Maintenance Disassembling / reassembling is facilitated by the limited number of well- connected parts, no tool needed.
Performance and Ordering Information - Calibrex ™ 520 Calibrex ™ 520 dispensers have a 32mm base thread and also fits GPI thread sizes 33-400 and 33-430. They come with three adapters (28, 40, 45mm) and feed tube 300mm. Inaccuracy (E%) Imprecision (CV%) Cat. No. Volume Division Min. Vol. Mid. Vol. Max. Vol. Min. Vol. Mid. Vol. Max. Vol. 844000 0.25 - 2mL 0.05mL < ± 3.0 % < ± 1.8 % < ± 0.6 % < 0.5 % < 0.35 % < 0.1 % 844002 1 - 5mL 0.1mL < ± 2.0 % < ± 1.3 % < ± 0.6 % < 0.5 % < 0.35 % < 0.1 % 844004 1 - 10mL 0.25mL < ± 1.5 % < ± 1.1 % < ± 0.6 % < 0.5 % < 0.35 % < 0.1 % *Specify desired fixed volume within instrument range when ordering. Performance values obtained with double-distilled water at constant temperature (± 0.5°C) comprised between 20 and 25°C in accordance with ISO 8655.
Superior Material Selection Special attention is paid to component materials, providing for long instrument life. Parts coming in contact with the liquid flow are chemically inert. Parts Material Feed Ttube PTFE Intake Valve Ceramic Valve Balls Pyrex ® Glass Valve Spring Platinum-iridium Barrel Borosilicate Glass Barrel Plate / Base PTFE Plunger Glass with PFA Coating Outlet Valve Ceramic Body ETFE Delivery Jet Assembly PTFE / ETFE
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