Checking The Volume - Mettler Toledo Rainin AutoRep S Manual Del Usuario

Depending on use, we recommend that gravimetric testing of the instrument
be carried out every 3-12 months. This time frame should be adjusted to
individual requirements. Gravimetric volume testing according to DIN EN
ISO 8655-5 is performed as follows:
1.
Preparation of the instrument
Fitting tip. This test can be carried out with Encode syringes of any size.
However, the 5 mL size is most commonly used for this purpose.
2.
Carry out the test
a) Adjust the stroke setting of AutoRep™ S to Step 5 (10% of
nominal volume).
b) Fill the Encode syringe by immersing it vertically into the testing
liquid.
c) Discard the first step; it only serves to align the internal mechanism.
d) Place the weighing vessel (containing a small amount of deionized
water) on a balance and tare the balance.
e) Dispense the second step into the weighing vessel. For this, push
down the dispensing lever at a steady rate to the stop and hold it
there. Then wipe the syringe on the vessel wall over a distance of
approx. 10 mm.
f) Enter weighed value into the test record.
g) Repeat points D to F 10x.
(For the 10th volume test, the 5 mL Encode syringe with a stroke
setting of 5 has to be filled a second time – steps A through C.)
h) Repeat the same testing procedure at stroke settings 3 (6% of nomi-
nal volume) and 1 (2% of nominal volume).
i) This results in a total of the 30 weighed values needed.

Checking the Volume

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