The VWR E-Burette is a state-of-the-art motor-operated burette designed for easy, safe, and accurate titrations in both laboratory and field settings. It is calibrated in accordance with DIN EN ISO 8655-3 guidelines, ensuring high precision and reliability.
Function Description:
The VWR E-Burette is designed for dispensing liquids directly from a reservoir bottle. It features a microprocessor-controlled motorized piston lift system with a recirculation valve, allowing for precise and controlled liquid handling. The instrument offers three calibrated pre-set dispensing speeds, including a fast mode, a medium mode, and a dropwise mode, to accommodate various titration needs and achieve accurate end points. The control panel is equipped with a 4" TFT touchscreen for intuitive operation and display of information. Data transfer capabilities are provided via a Mini USB cable, allowing for connection to a PC/Laptop for software initialization, data saving, and printing. The device also includes an internal memory to store up to 20 recorded readings.
Important Technical Specifications:
- Performance Data: 50 ml
- Unit Type: Microprocessor-controlled motorized piston lift system with recirculation valve.
- Volume Ranges: 0.01 ml – 500 ml (Maximum piston lift 50 ml, automatic addition).
- Volume Accuracy: A= 0.05% / CV = 0.05%. These error limits are well within the limits of DIN EN ISO 8655-3, obtained using distilled water at equilibrium and an ambient temperature of 20 °C.
- Increment: 10 µl.
- Operating Temperature: +10 °C to +40 °C (50 °F to 104 °F).
- Power Supply: 18 V, 3 A (Output supply: 110 V, 230 V).
- Battery Operation: One complete battery charge provides approximately 3 hours of continuous operation. Battery capacity is indicated on the TFT display, and the charging time is 6.5 hours.
- Quality Control: In compliance with DIN EN ISO 8655-3.
- Touchscreen: 4" TFT Screen.
- PC Interface: Mini USB Cable.
- Languages: Available in 4 languages (English, Spanish, German, and French).
Usage Features:
The VWR E-Burette offers several user-friendly features:
- Battery Connection: The device requires a 14.4 V Li-ion rechargeable battery, which is connected by opening a panel at the back of the control panel and inserting the battery connector until it clicks.
- Telescopic Tube Adjustment: The length of the FEP telescopic tube can be adjusted to fit various reservoir bottles. Longer tubes are available upon request.
- Bottle Adapters: The threaded platform base has a 30 mm screw thread. Five adapters are supplied to suit containers with 28, 32, 38, 40, 45 mm, and 30 mm (inbuilt adapter) screw necks.
- Charging: The device can be charged by inserting the charging pin at the back of the control panel and connecting the power cord to the AC adaptor and a 220 V power supply. A charging symbol indicates the battery status.
- Switching On/Off: The instrument is switched on via an ON/OFF button at the back of the control panel.
- Purging Mode: A recommended step before use to ensure bubble-free dispensing. The device purges automatically once the knob is turned to recirculation mode and confirmed on the screen.
- Titration Mode: Users turn a knob to set the device to titration mode.
- Dispensing Speeds:
- Fast mode: 3.8 ml/sec.
- Medium mode: 1.3 ml/sec.
- Dropwise mode: 0.010 ml/click, allowing for very accurate end point achievement.
- Dispensing Control: Dispensing is performed by touching the screen and stops immediately when the touch is removed.
- TARE Function: A TARE button allows resetting the dispensed volume to zero for repeated measurements.
- Data Transfer: A Mini USB cable connects the control panel to a PC/Laptop for transferring and storing data. Software initialization involves running a communication icon, selecting the port, opening it, and then adding readings from the control panel to the PC/Laptop. The ADD button blinks during data transfer.
- Memory: The internal memory saves the last 20 recorded readings, which can be recalled using the RECALL and LAST buttons on the control panel.
- File Management: Data can be saved as an Excel file and printed directly from the software. A REFRESH tab allows clearing previous readings for new measurements.
- Language Settings: Users can select their preferred language (English, Spanish, German, French) from the settings screen.
- Brightness Settings: The brightness of the control panel screen can be adjusted from the settings menu.
- Calibration: The VWR E-Burette is factory calibrated. Gravimetric testing every 3-12 months is recommended due to environmental changes and media viscosity. User calibration involves filling and dispensing a nominal volume of de-ionized water, measuring it on a balance, and entering the value using an electronic keyboard. A "CAL" label appears on all screens when user calibration is active.
- Factory Reset: A password-protected factory reset function is available for reverting to manufacturer settings. This will remove any user-calibrated settings and the "CAL" label.
Operating Limitations and Exclusions:
- Chlorinated and fluorinated hydrocarbons: May cause piston movement difficulties if deposits form. Immediate cleaning is required if the piston becomes difficult to move.
- Inflammable fluids: Avoid static charge buildup. Do not dispense into plastic vessels or wipe with a dry cloth.
- General laboratory applications: Designed for general use and complies with DIN EN ISO 8655-3. Users should check compatibility for specific applications (e.g., trace material analysis, food sector). Approvals for specific production and administration of food, pharmaceuticals, and cosmetics are not available.
- Do not use with:
- Liquids that attack FEP, PFA, and PTFE (e.g., dissolved Sodium Azide*).
- Liquids that attack borosilicate glass (e.g., Hydrofluoric acid).
- Hydrochloric acid > 40% | Tetrahydrofuran or Oxolane | Trifluoroacetic acid.
- Explosive liquids (e.g., Carbon Disulfide).
- Suspensions (e.g., of charcoal) as solid particles may clog or damage the instrument.
- Liquids that attack PP (cap).
- Aggressive atmospheres, e.g., HCl fumes.
- The permissible concentration of dissolved Sodium Azide is not more than 0.1%.
- Physical Limits:
- Maintain instrument and reagent between +10 °C to +40 °C.
- Aspirate slowly above 300 mbar to prevent liquid from boiling.
- Kinematic viscosity up to 500 mm²/s.
- Relative air humidity between 20% and 90%.
- Use fluids with density up to 2.2 g/cm³.
Maintenance Features:
- Cleaning Cycle: If the piston is difficult to move due to crystal formation or dirt, a cleaning cycle should be performed.
- Filling Valve Maintenance: If the filling valve is stuck, a 200 µl plastic tip can be used to loosen the valve ball.
- Air Bubble Removal: If air bubbles are present, purge the instrument again. Ensure the telescopic filling tube is firmly fastened and dips into the liquid. If necessary, cut the tube or replace it.
- Delivery Volume Correction: If the delivered volume is smaller than indicated, prime the instrument again.
- General Cleaning: The dispenser should be cleaned with distilled water. Fill the barrel completely and press the fast dispense button to flush the water through.
- Delivery Pipe Disassembly/Assembly: The chuck nut can be unscrewed (anticlockwise) to remove the delivery pipe for cleaning with de-ionized water. Reassemble by pushing the pipe into the lower housing and screwing the chuck nut clockwise.
- External Cleaning: The external body of the instrument can be cleaned with rubbing alcohol on a cloth or cotton swab.
- Sensitive Media: For light-sensitive media (e.g., Iodine, Potassium Permanganate, Silver Nitrate solutions), 'Amber Coloured Windows' or the inspection windows provided in the box are recommended. These can be replaced by unclipping the default window and pressing the amber window into the slot until it clicks.
Storage Conditions:
Store the instrument and accessories in a clean, cool, and dry place. The recommended storage temperature is from -20 °C to +50 °C (-4 °F to 122 °F) with relative humidity between 5% and 95%. When mounted to a reagent bottle, always carry and store the instrument in an upright position.
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