1. How do I clean my HAWACH bottle-top dispenser?
Follow the cleaning instructions in the user manual. Any questions, contact HAWACH after-sales team immediately.
Follow the cleaning instructions in the user manual. Any questions, contact HAWACH after-sales team immediately.
2. The bottle-top dispenser cylinder doesn’t fill. Why?
Several different reasons are possible to keep a HAWACH bottle-top dispenser cylinder from filling:
1) The discharge tube is not fitted properly. Check to ensure it is attached properly.
2) The filling valve is not tight or the filling tube is not pushed in enough. The filling valve is most often loose because the autoclaving instructions were not followed closely. Recheck the connections.
3) The filling valve is dirty and/or stuck. If the filling valve is dirty, clean the valve. If it is simply stuck, follow the instructions in the user manual for loosening the ball valve.
Several different reasons are possible to keep a HAWACH bottle-top dispenser cylinder from filling:
1) The discharge tube is not fitted properly. Check to ensure it is attached properly.
2) The filling valve is not tight or the filling tube is not pushed in enough. The filling valve is most often loose because the autoclaving instructions were not followed closely. Recheck the connections.
3) The filling valve is dirty and/or stuck. If the filling valve is dirty, clean the valve. If it is simply stuck, follow the instructions in the user manual for loosening the ball valve.
3. Even the cylinder can fill, it won’t dispense. Why?
The discharge valve is probably stuck. Remove the discharge tube and discharge valve, and clean the discharge valve. If necessary, replace the discharge valve.
The discharge valve is probably stuck. Remove the discharge tube and discharge valve, and clean the discharge valve. If necessary, replace the discharge valve.
4. HAWACH bottle-top dispenser is drawing up bubbles and liquid? How to get rid of them?
The dispenser has an air leak somewhere. Good places to look are at the junction of the filling tube and filling valve. If it does not make a tight seal, trim some of the tubes off, and reattach. Check to see if the filling and discharge valves are tight. If the dispenser was dropped the cylinder may have cracked, or come loose from the valve block. Lastly, is there any liquid in the bottle?
The dispenser has an air leak somewhere. Good places to look are at the junction of the filling tube and filling valve. If it does not make a tight seal, trim some of the tubes off, and reattach. Check to see if the filling and discharge valves are tight. If the dispenser was dropped the cylinder may have cracked, or come loose from the valve block. Lastly, is there any liquid in the bottle?
5. HAWACH bottle-top dispenser seems to leak at the base, especially after priming. How to stop this?
It’s probable that the recirculation tube was not reinserted into the underside of the instrument. This directs liquid down the side of the bottle, to help keep from generating additional bubbles when priming. When absent, some liquid can dribble down the side of the instrument. If you need a replacement, contact HAWACH.
It’s probable that the recirculation tube was not reinserted into the underside of the instrument. This directs liquid down the side of the bottle, to help keep from generating additional bubbles when priming. When absent, some liquid can dribble down the side of the instrument. If you need a replacement, contact HAWACH.
6. The piston of the dispenser is moving roughly. What should do?
Crystals have probably gotten between your piston and cylinder, and are grinding away the piston and seal. (If the instrument has been operated in this condition, it is possible that the piston and cylinder are scored. To avoid this happening, the dispenser should be cleaned at the first sign of roughness.) Gently remove the piston, and follow the cleaning procedure. Retry the dispenser. The best way to avoid this issue is to clean your dispenser at regular intervals. Continued use of the dispenser in this condition can destroy it.
Crystals have probably gotten between your piston and cylinder, and are grinding away the piston and seal. (If the instrument has been operated in this condition, it is possible that the piston and cylinder are scored. To avoid this happening, the dispenser should be cleaned at the first sign of roughness.) Gently remove the piston, and follow the cleaning procedure. Retry the dispenser. The best way to avoid this issue is to clean your dispenser at regular intervals. Continued use of the dispenser in this condition can destroy it.
7. What is the function of the drying tube?
When HAWACH bottle-top dispenser dispenses liquid, air needs to enter the container to displace the liquid. If the liquid is sensitive to components in the air, for example, water vapor, a drying tube is recommended, so that an appropriate drying agent can remove the water.
When HAWACH bottle-top dispenser dispenses liquid, air needs to enter the container to displace the liquid. If the liquid is sensitive to components in the air, for example, water vapor, a drying tube is recommended, so that an appropriate drying agent can remove the water.
8. Difference between accuracy and precision
Accuracy is how close to the desired target value a test result is. Precision is how close a series of test results are to each other.
Accuracy is how close to the desired target value a test result is. Precision is how close a series of test results are to each other.
9. Does temperature make a big difference in gravimetric testing?
Yes, it does. Ideally, calibrations should be done in a climate-controlled room. At least, the temperature should be recorded with a thermometer having a measuring error of max. ± 0.2°C when calibration is performed.
Yes, it does. Ideally, calibrations should be done in a climate-controlled room. At least, the temperature should be recorded with a thermometer having a measuring error of max. ± 0.2°C when calibration is performed.
10. What standard does the recommended steam sterilization (autoclaving) procedure reference?
The 121°C, 2 bar absolute (30 psi) with a holding time of at least 15 minutes protocol used for the dispenser.
The 121°C, 2 bar absolute (30 psi) with a holding time of at least 15 minutes protocol used for the dispenser.
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