Frequently Asked Questions When Using Adjustable Bottle-Top Dispenser

HAWACH has summarized some FAQs for you to solve your possible problems as soon as possible.

Q1: How to use the lab adjustable bottle-top dispenser?
1. Insert the liquid inlet pipe and tighten the nut.
2. Insert the drain tube and tighten it.
3. Open the cap and place it under the drain tube.
4. Adjust the dispensing volume from zero to the corresponding value through the rotating scale.
5. Exhaust process: Make sure that the cover of the drainpipe is open, lift the piston for a certain distance, then press it down, repeat this step 1-2 times, and stop when the bubbles are completely eliminated through the observation window.
6. After exhausting, start preparing for liquid dispensing. (Note: If the exhaust has not been completely exhausted, please check whether the suction pipe or other valves are installed correctly.)
7. Adjust the dispensing volume from zero to the corresponding value through the rotating scale.
8. After use, first, press the piston to the bottom, and then adjust the knob to zero scales to lock the bottle dispenser.
9. Process: Lift the piston steadily to a higher place, and then press it to the bottom steadily, thus completing a dispensing process.

Q2: After autoclaving HAWACH bottle-top dispenser, it leaks. What’s happening?
The housing has a large amount of surface area.
Some condensation may collect as droplets just below the housing, on top of the valve block, if it is not given sufficient drying time in the autoclave.

0.1~99.9mL Electronic Bottle-Top Dispenser

Q3: What precautions should take when dispensing scintillation fluid?
Many scintillation fluids precipitate in the presence of water. These precipitates can impair the function of the HAWACH bottle-top dispenser. Please make sure the bottle-top dispenser is completely dry before use. Additionally, in humid climates, it may be necessary to use a drying tube to keep atmospheric moisture from contaminating your scintillation fluid.

Q4: What is the function of the recirculation valve?
The recirculation valve allows you to prime the lab adjustable bottle-top dispenser without wasting any of your chemicals. Before the first use, or after sitting for a period of time, the HAWACH bottle-top dispenser needs to be primed to remove air bubbles. With the recirculation valve, we will not waste any chemicals during the detonation process. If there is no recirculation valve, the initial initiator will be discarded.

Q5: What are the safety instructions for using HAWACH bottle-top dispenser?
1. Read and understand all the details in the user Manual before use.
2. Use protective clothing, eye protection glasses, and gloves while working with hazardous liquids.
3. Do not dispense inflammable media into plastic vessels which generates a static charge.
4. It is not suitable for concentrated  (Hydrochloric  Acid,  Fluorinated  Hydrocarbons,  Saline  Solutions,  Nitric Acid), highly concentrated alkaline solution and crystallizing solution, the liquids attacking  FEP,  PFA,  PTFE,  Borosilicate glass, organic solvents, Trifluoroacetic Acid, explosive liquids, fuming acids, Tetrahydrofuran, suspension (e.g. of charcoal) as solid particles.
5. Handle the dispenser carefully in case of an accident caused by it.
6. The nozzle should always point away from the user while dispensing. Avoid splashes.
7. Always use suitable vessels for dispensing liquids.
8. Never push down the piston while the nozzle cap is on.
9. To clean the discharge tube regularly is recommended.
10. Please do not give excess pressure while aspirating or dispensing. The glass tube may break inside. Please follow the troubleshooting guide if you find any difficulty in moving the piston up and down.
11. Please use original accessories to avoid any kind of accidents.

Q6: How to clean the bottle-top dispenser?
In order to ensure the lab adjustable bottle-top dispenser has a long service life, some maintenance and cleaning can be done in the following situations: the pipetting piston is not flexible; dispense some restrictive solutions (such as high concentration salt solution and high concentration of alkaline solution); before replacing the dispensing reagent; before sterilizing the bottle-top dispenser; replacing the pipes of the bottle-top dispenser (suction tube, return tube and dispensing tube); before long-term storage.
1. Set the scale dial to the zero position, and cover the nozzle of the dispensing tube;
2. Place the dispenser and reagent bottle in an appropriate cleaning container, and then set the scale dial to the maximum dispensing volume;
3. Rotate and remove the bottle dispenser from the reagent bottle (wear gloves to operate);
4. Place the dispensing tube on the reagent bottle mouth, and at the same time remove the dispensing tube cap and slide it back to a fixed position;
5. Move the piston handle up and down (make sure the arrow of the safety valve points to the dispensing tube) to remove the remaining solution;
6. Put a suitable special cleaning solution in the cleaning container, immerse the suction tube in it, and repeat the suction and discharge several times;
7. After repeated pipetting and cleaning with an appropriate solution (such as distilled water or acetone) for many times, take out and drain the remaining solution in the bottle dispenser;
8. Remove the suction tube, return tube, and dispensing tube from the bottle dispenser and clean them separately.