Velp Scientifica
–TB1 Manual
12
3.2.1 Preparation of Sample Vial
1. Grab liquid with the plastic bottle provided.
2. Obtain a clean and dry sample vial (Figure 7).
3. Take care to handle the sample vial by the top.
4. Rinse the vial with approximately 10 ml of the sample
water, capping the vial with the black screw cap and
gently inverting it several times. Discard the used sample
and repeat the rinsing procedure two more times.
5. Fill the rinsed vial with the remaining portion
(approximately 10 ml) of the grab sample up to the
mark indicated in the vial. Cap the vial with the
supplied black screw cap.
6. Wipe the vial with the soft, lint-free cloth supplied. Ensure that the
outside of the vial is dry, clean and free from smudges.
7. Apply a thin film of silicone oil (supplied) on the sample vial (see Figure
8). Wipe with a soft cloth to obtain an even distribution over the entire
vial’s surface.
NOTES:
1. The purpose of oiling the vial is to fill small
scratches and to mask the imperfection in the
glass.
2. Do not apply large quantity of oil as this may
collect dirt and dust.
8. You are now ready to place the vial into the meter for measurement.
Figure 8:
Apply a thin film of silicone oil
Figure 7:
Sample Vial
