A Detailed Description of the Bottle-Top Dispenser Operation
The bottle-top dispenser is a frequently used experiment tool and the right operation will make the experiment result more accurate and effective.
1. Preparation before use
Prepare protective clothing, eye protection, and gloves. When touching the dispenser or bottle, especially dangerous and corrosive liquids in it, always wear protective gloves. The adapters are made of polypropylene (PP), so they can only be applied to media that do not attack PP. Before use, read through the User Manual and especially the Operating Exclusions and Limitations.
2. The discharge tube connection
Firstly, push the discharge tube as far as possible into the discharge valve. And then tighten the locking nut by finger to ensure a tight fit. Please note that do not use any other type of discharge tube or a deformed one.
3. The filling tube connection
The filling volume of the Hawach bottle-top dispenser ranges from 0.1ml to 99.9ml. For bottle-top dispensers 0-25 ml and 0-50 ml, the filling tube can be connected. Then, cut off the filling tube diagonally and push the filling tube into the valve block as far as possible with the diagonal end down.
4. The mounting dispenser on the bottle
The bottle-top dispenser can be screwed directly onto a 45 mm screwthread. For other bottles, use the accompanying adapters.
5. Priming the bottle-top dispenser
Please note the small bottles require a bottle stand to prevent tipping over. The discharge tube and closure cap may be dropped off by reagent, so operators should hold the discharge tube and carefully remove the closure cap. Then, slide the closure cap backward on the tube support, away from the discharge tube opening.
When priming holds a discharge tube on the inner wall of a suitable recipient, operators should avoid splashes. Gently pull the piston up (1 to 2 cm), then press it down rapidly. Repeat this procedure to remove most of the air bubbles. Pay particular attention to critical areas where bubbles may lodge. Before the first use of the bottle-top dispenser, please ensure it is rinsed carefully or discard the first few samples dispensed.
6. Dispensing
The discharge tube must always be pointed away from the user or anyone else. Do not press down the piston when pushing up the cap. The reagent may drip from the drain tube and the cap.
7. Cleaning
The instrument must be cleaned in the following situations to assure correct operation:
– if the piston becomes difficult to move
– after dispensing liquids which form deposits
– before changing the reagent
– prior to long-term storage
– the cap has accumulated liquid
– before sterilization
– before replacing the valves
The parts containing the reagent include filling and discharge tubes, valves, and glass cylinders. Point the valves and tube openings away from your body. Just as mentioned above, always wear protective clothing, eye protection, and gloves.
- Push on the cap.
- Empty and unscrew the instrument from the bottle and lift the instrument so that the filling tube is out of the liquid but still in the bottle.
- Carefully tap the filling tube against the bottle from the inside so that the reagent runs back into the bottle.
- Remove the cap, by repeated piston operation to dispense the remaining reagent.
- Mount the bottle-top dispenser onto another bottle filled with an appropriate cleaning solution.
- Flush the bottle-top dispenser.
- Empty the bottle, flush and fill it with water. Repeat steps 6 and 7.
- Empty the bottle-top dispenser.
- Unscrew the piston seat and pull the piston out of the glass cylinder carefully by pulling on the piston seat only.
- Remove deposits at the edge of the glass cylinder with a screwdriver. Take a bottle-brush to clean the piston and cylinder.
- Carefully reassemble the instrument in reverse order. The flush instrument with distilled water.
- Please notes the piston should be inserted straight into the cylinder, without an angle.
