- Fill the syringe with the solution to be filtered.
- Fasten the filled syringe to the FLL inlet of the syringe filter with a twisting motion.
- With the outlet pointed upward, gradually apply¬†pressure to the syringe plunger to initiate flow.
- Continue thumb pressure until all the air in the device is displaced with liquid.
- Once liquid starts to exit syringe fitter outlet, stop applying-pressure, point the device downward and away from user.
- Position syringe filter over suitable collection container or other apparatus and apply pressure again to filter sample. Change filters when flow becomes too slow or resistance becomes excessive.
Air locks can seriously hamper flow rates. To eliminate, point the outlet of the filter device upward during the initiation of liquid flow.
Bubble Point Test
To achieve an accurate bubble point, flush the filter with a minimum of 50ml of test fluid (this is to ensure that all the air is removed from the device). After the filter is completely wet and with the outlet pointed upward, apply air under controlled pressure to the inlet until air breaks through the filter and bubbles can be seen exiting the outlet. The pressure at which air passes through the wetted filter is the Bubble Point.
When considering the special factors of your application, consult the Technical Data to determine correctness of use. Do not exceed the pressure, temperature or chemical compatibility recommendations. High pressures can be obtained when using syringes. The smaller the syringe the¬†higher the pressure that can be generated. As a general guide, the following pressures can be obtained by hand with the syringes indicated: 20 mL; 80 psi; 10mL, 140 psi; 5mL, 180 psi; 3mL, 200 psi; 1mL, 250 psi. Each user should determine the pressure they can generate by hand with a specific size syringe and take appropriate safety precautions not to exceed the recommended rating for the device used. If these limitations are exceeded, bursting of the device may occur resulting in loss of sample or personal injury.