Owner manual

3.4 Multi-mode electrode (MME)

746 VA Trace Analyzer / 747 VA Stand

3-23

3.4.7 Replenishing the mercury (without changing capillary)

The multi-mode electrode 3838 can also be refilled with mercury without having to

remove the glass capillary 109109.

Dismantle multi-mode electrode

• Unscrew FEP tubing 5151 and 5959 from the MME. Disconnect electrode

cable 3737 from the MME.

• Take multi-mode electrode 3838 out of the measuring head 4141 and tap the

MME gently to knock off any mercury drops on the glass capillary into the

measuring vessel.

• Place multi-mode electrode 3838 horizontally in the electrode holder 114114

(see Fig. 15-3). The slotted screw 101101 is now at the top.

Replenish mercury

• Unscrew slotted screw 101101 using a suitable coin. If the slotted screw 101101

can not be loosened by hand, screw on locking ring 9595 and pull out of the

MME.

• Draw up mercury using the syringe 111111 with attached needle 112112 and

expel into the Hg reservoir 103103.

The Hg reservoir 103103 must never be filled more than

full with

mercury.

• Reinsert slotted screw 101101 into screw thread 100100 and screw flush to

surface using a suitable coin (this action may expel a few drops of mer-

cury from glass capillary 109109).

Do not turn so tightly that the cemented-in steel threaded ring 100100

becomes loose and hence jeopardizes the tightness and safety of the

MME!