Metrohm 746 VA Trace Analyzer - Manual (Page 43)

3 Installation
746 VA Trace Analyzer / 747 VA Stand
3-16
3.4.2 Filling the MME with mercury
When handling mercury, it is necessary to take special precautionary
measures. These are described in detail in section 7.2.
All actions involving the electrode and mercury vessels must be
performed in or over the drip pan 113 113 supplied (see Fig. 14).
The Hg reservoir 103 103 of the multi-mode electrode 38 38 is filled with mercury of the
highest degree of purity (mass fraction w ≥ 0.99999) as follows:
1 Prepare multi-mode electrode
• Unscrew locking ring 95 95 from slotted screw 96 96 (this gray PVC ring is
needed only to remove the slotted screws 96 96 or 101 101, see section 3.4.7
and section 3.4.9).
• Turn slotted screw 96 96 in or out of the screw thread 98 98 using a suitable
coin until the contact surface of the black O-ring at the Plexiglas wall (thin,
black stripe) is just visible below the metal thread 98 98.
• Remove the plastic cap used as a transport safeguard from the retaining
nut 108 108.
• Undo retaining nut 108 108 fully and remove from screw thread 104 104.
• Place multi-mode electrode 38 38 with the capillary opening facing upwards
in the electrode holder 114 114 (see Fig. 13).
111 111
112 112
113 113
38 38
114 114
Mercury
Fig. 13: Adding the mercury
38 38 Multi-mode electrode
(6.1246.0020)
113 113 Drip pan (6.2711.030)
111 111 Syringe (6.2816.020) 114 114 Electrode holder
(6.2615.030)
112 112 Needle (6.2816.030)