Metrohm 797 VA Computrace - Manual (Page 57)

2.9 Connection of 863 Compact Autosampler
797 VA Computrace / Hardware-Manual 8.797.8001EN
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1 Install accessories at 797 VA Computrace Stand
• Instead of the 6.1415.210 measuring vessel, install the 6.1456.210 measur-
ing vessel at the 797 VA Computrace Stand.
• Cut PTFE tube 119 (6.1819.010) to a length of max. 20 mm and insert
from above in opening 56 of the measuring head 24.
• Cut the bottom end of PTFE tube 120 (6.1819.010) diagonally and insert
from above in opening 55 of the measuring head 24. To ensure that the
solution (particularly the mercury) is siphoned off as completely as possible,
the end of the tube must be located in the deepest part of the 6.1456.210
measuring vessel (left rear when viewed from front).
• Screw FEP tubing 117 (6.1805.180) into threaded openings 55 and 69.
• Screw FEP tubing 118 (6.1805.020) into threaded opening 56 of the mea-
suring head 24. Screw a 6.1808.000 tubing coupling to the other end of
FEP tubing 118 (tighten strongly, to prevent leakage of possibly corrosive
liquid!) and insert the coupling in a slot of the tubing holder at the rear of
the 797 VA Computrace Stand.
2 Connect 863 Compact Autosampler
• Install accessories at 863 Compact Autosam-
pler (see Instructions for Use 863).
• Adjust 6.1835.030 Pipetting needle at the
863 Compact Autosampler to ensure that
the lower end of the needle is positioned
max. 0.5 mm above the bottom of the sam-
ple vessel (see Fig. 18). This is essential to
guarantee a complete transfer of the sample
from the sample vessel into the measuring
vessel of the 797 VA Computrace Stand.
• Insert 6.1822.410 transfer tubing connected
to 6.1826.020 pump tubing from above into
opening 60 of the measuring head 24 at the
797 VA Computrace Stand (see Fig. 6) and
fix it by screwing the nipple.
Fig. 18: Adjusting the pipet-
ting needle
max. 0.5 mm