Owner manual

3 Installation

746 VA Trace Analyzer / 747 VA Stand

3-10

Install MME or dummy stopper

in operation with MME:

• Carefully insert multi-mode electrode 3838 (6.1246.020) in opening 7676 (the

underside of the capillary must not touch the measuring head during in-

sertion) and push in as far as it will go.

• Screw FEP tubing 5151 (6.1805.180) for inert gas supply into connection 9393

of the MME 3838.

• Screw FEP tubing 5959 (6.1805.180) for inert gas supply into connection 9494

of the MME 3838.

• Attach electrode cable 3737 (WE) to screw connection 110110 of the MME 3838:

push cable lug under the screw and then tighten screw firmly.

in operation with RDE (option):

• Insert stopper 119119 (6.2709.040, option) into opening 7676 as far as it will go

so that the two blind holes point to the rear of the stand.

• Screw FEP tubing 5151 (6.1805.180) into upper hole of stopper 119119.

• Screw FEP tubing 5959 (6.1805.180) into lower hole of stopper 119119.

Install accessories for rinsing and siphoning off (option)

For rinsing the measuring vessel at the 747 VA Stand manually (dialog

page "STAND") or with the RINSE command, two 700 Dosinos with

50 mL Dosing units must be connected to the 746 VA Trace Analyzer

and initialized acc. to section 3.10.5 and the 6.1456.210 measuring

vessel (option) must be used instead of the 6.1415.210 measuring

vessel.

• Cut PTFE tube 9191 (6.1819.010) to a length of ca. 30 mm and insert from

above in opening 7474 of measuring head 4141 (see Fig. 10).

• Cut the bottom end of PTFE tube 9292 (6.1819.010) diagonally and insert

from above in opening 7373 of measuring head 4141. To ensure that the solu-

tion 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 8989 (6.1805.180) into the threaded openings 7373 and 8787.

• Screw FEP tubing 9090 (6.1805.100) into threaded opening 7474 of measur-

ing head 4141. Screw a 6.1808.000 tubing coupling to the other end of FEP

tubing 9090 and insert the coupling in a slot of the tubing holder at the rear

of the VA Stand.

Install measuring vessel

• Tilt back measuring head arm 4040.

• Slide measuring vessel 2828 into holder 2626 from the front and fill with

analyte solution or dist. H

O (storage solution) until the tips of the MME

and the reference electrode are immersed in the liquid.

• Lower measuring head arm 4040 and cover 2424.