beautypg.com

8 suppressor module, 1 general information on suppressor module, 2 preparation of the peristaltic pump – Metrohm 792 Basic IC User Manual

Page 44

background image

2.8 Suppressor module

792 Basic IC

35

2.8 Suppressor

module

2.8.1

General information on suppressor module

The

Metrohm Suppressor Module MSM for chemical suppression in-

stalled in the 2.792.0020 Basic IC comprises a total of 3 suppressor

units which are in turn used for suppression, regenerated with sulfuric

acid and rinsed with water. To record every new chromatogram under

comparable conditions, work is normally carried out with freshly regen-

erated suppressor. Switching is either automatic together with the valve

switching or manual.

The suppressor units must never be regenerated with H

2

SO

4

in the

same flow direction used for the eluent. You should thus always install

the inlet and outlet capillaries as described in section 2.8.4 according

to the scheme shown in Fig. 15.


For operation of the suppressor module, the

two-channel peristaltic

pump built into the 2.792.0020 Basic IC is used which conveys the re-

generation solution (normally

20 mmol/L H

2

SO

4

) and the rinsing solu-

tion (normally

dist. H

2

O) to the suppressor units (flow rate of

0.5 mL/min).
The three inlets and outlets numbered 1...3 on the suppressor module

each have 2 permanently mounted PTFE capillaries, which must be

connected as described in section 2.8.4 (see Fig. 14 and Fig. 15).
To avoid contamination of the suppressor module by foreign particles

or bacterial growth, the two

6.2821.100 Filter units PEEK (see sec-

tion 2.3.5) supplied with the 2.792.0020 Basic IC must be installed be-

tween the peristaltic pump and the inlet capillaries of the suppressor

module.

The suppressor module must never be switched in the dry state as

there is a danger of blocking. Before every switching operation of the

suppressor module, the three suppressor units must have been

rinsed for at least ½ h with eluent, regeneration and rinsing solution.

2.8.2

Preparation of the peristaltic pump

Before start-up the accessories for the 2-channel peristaltic pump built

into the 792 Basic IC must be mounted according to Fig. 13. Proceed

as follows:

1 Attach pump tubings

x Loosen both tubing cartridges 40

40

40

40 mounted above pump drive

44

44

44

44 from the holding clamp 42

42

42

42 by pressing down snap-action

lever 43

43

43

43 and remove from mounting pin 45

45

45

45 (see Fig. 14).