Metrohm 700 Dosino - Manual (Page 13)

2.2 710 Dosing unit
700 Dosino, Instructions for Use
7
2.2 710 Dosing unit
Checks
Please check immediately on receipt whether the shipment is
complete and undamaged (compare with delivery note and list of
accessories in section 4.5). If transport damage has occurred
please refer to section 4.4 'Warranty'.
2.2.1 Mounting the dosing units
Dosing units are available with different cylinder volumes from 2 to
50 mL (see accessory list, p. 45). Dosing units with glass cylinders
(ordering no. 6.3031.XXX) are available for standard applications
such as dosing and titrating with non-aggressive solutions. For
dosing aggressive media such as strong alkalis we recommend
the use of dosing units with ETFE cylinders (ordering no.
6.3030.XXX). Dosing units must be ordered separately.
Standard situation
Dosing units can be mounted directly on reagent bottles with a
GL45 thread. Suitable threaded adapters are available for bottles
from different chemical manufacturers (see accessories list, p. 45).
•
First attach the 6.2052.000 Buret tip holder to the white plastic
ring of the dosing unit. Insert the double web of the holder into
the upper edge of the ring until it reaches the notch and then,
using a little pressure, carefully tilt the buret tip holder down-
wards until the individual webs snap into the lower edge of the
ring. A buret tip can now be suspended from the holder with the
tip facing upwards.
•
Screw the 6.1829.010 Aspiration tubing tightly onto the
threaded connection on the lower surface of the dosing unit.
This is the filling port (Dosino Port 2). Make care that the tubing
is attached tightly so that no air bubbles can penetrate when
the reagent solution is aspirated. Tighten the screw nipple firmly
by hand.
Buret tip holder