Classification, Install and, Maintenance of Bottle-Top Dispenser

There are three types of bottle-top dispensers, namely basic type, organic type and hydrofluoric acid type, which have basically covered all the solvents in the laboratory.

Basic type
The basic type is suitable for a wide range of reagents, including general acid-base salt solutions, lower concentrations of non-oxidized strong acid strong bases and polar organic solvents, such as H3PO4, HCl, H2SO4, NaOH, NaCl, and the like.

Organic type
The organic type is suitable for a wide range of organic solvents and higher concentrations of strong acid solutions, such as chlorine-containing fluorine-containing organic solvents, trifluoroacetic acid, tetrahydrofuran, peroxide, chloroform, HNO3 and the like. In addition, chloroform as a solvent for most plastics has forced many experimenters to use traditional glass graduated cylinders and beakers to pipette, but chloroform is extremely volatile and has anesthetic and toxic nerve effects. All parts of the HAWACH bottle-top dispenser that come into contact with the solvent are made of PFA and glass, so the HAWACH bottle-top dispenser can completely remove chloroform.

Hydrofluoric acid type
Hydrofluoric acid type is only for HF solution. Since the HF corrodes the glass, the piston of the dispenser is a ceramic piston, and the reagent bottle to be fitted with it should be a plastic material.

Four steps to install bottle-top dispenser

1. Install the pipette
According to the size of the reagent bottle used, cut the matching pipette into a suitable length, and manually screw one end of the pipette with the fixed threaded sleeve to the bottom valve of the bottle-top dispenser.

2. Install the return tube
Insert a short, straight end of the transparent liquid return tube with a bend into the socket at the bottom of the bottle top dispenser and next to the pipette valve.

3. Install the dispensing tube
A dispensing tube with a white plastic support sheath is secured to the horizontal interface on the front side of the dispenser by a fixed nut at one end thereof. Note that the liquid separation tube is inserted tightly before tightening the screw.

4. Install to the reagent bottle
It is mounted (for instance, on the diameter A45) to the threaded bottleneck through the threaded connection at the bottom of the bottle top dispenser. If the diameter of the reagent bottle is smaller than the above-mentioned diameter, it can be transferred to the reagent bottle used by the matching thread adapter.

About the maintenance of bottle-top dispenser

Every three months of use must be cleaned and checked for usage. The bottle-top dispenser must be cleaned in the following cases:
1. The piston is tight and bun
2. After removing the reagent/solution that needs to be cleaned regularly at the bottle dispenser
3. Before replacing the reagent
4. Before sterilization
5. Before replacing the inlet valve, drain valve, and return valve
6. Before being out of service for a long time

Tube cleaning
1. After pipetting, rotate the adjustment ring to the“0”scale position.
2. Put the dispenser and reagent bottle together in a suitable cleaning container.
3. Rotate the adjustment ring to the maximum range
4. Unscrew the dispenser from the reagent bottle
5. Put the drain tube against the collection bottle
6. Move the piston to drain the liquid in the pipeline
7. Put the inlet tube into a suitable cleaning solution and thoroughly clean the tube by repeated pipetting.

Thorough cleaning
1. Complete tube cleaning first
2. Disassemble the drain pipe, the inlet pipe, the drain valve, the inlet valve, and the turbulent pipe. Be careful not to straighten the operator when disassembling.
3. Move the piston
4. Clean the sleeve and piston with a brush and detergent
5. Then soak the dispenser in a suitable cleaning solution and rinse it repeatedly, then rinse with deionized water and soak overnight if needed.