Metrohm 797 VA Computrace User Manual

Page 246

8 How to ...?

797 VA Computrace – Software

234

Suppressor Analysis with 838 Advanced Sample Processor and DT

Following installations and settings are recommended for the
automated Suppressor determination with the 838 Advanced
Sample Processor

and the "dilution titration technique":

Instruments
Install the 838 Advanced Sample Processor, two 800 Dosi-
nos and a 732 Relay Box with two 823 Membrane Pump
Units (see Hardware Manual 797 and 838 Instructions for Use).

Dosinos:

Dosino 1:

50 mL Exchange Unit

VMS

Solution

(Dosino 2:

not used)

Dosino 3:

2 mL Exchange Unit

Sample / Suppressor
standard solution

Dosino 3 must be used to add Suppressor standard solution when
recording the calibration curve - and to add sample when de-
termining the sample. It is connected directly to the pipetting need-
le of the 838 Advanced Sample Processor.

Method at 838

Before each start, define the position of the first sample vessel for
the 838 parameter "

SAMPLE

" with the 838 keypad.

Set method DT at the 838 Advanced Sample Processor.

Note: You should enter the exact number of samples for parame-
ter

number of samples

. Otherwise the Dosino won't be rin-

sed at the end.

parameters

method DT
number of samples

16 >

Number of samples to be
processed (entire sample
rack)

>start sequence

1 CTL:Rm:

INIT

> Initialize Remote lines

2 Move

sample >

First Sample on Pos. "SAM-
PLE"

3 CTL:Rm:

************1 >

Remote start CT797

4 CTL:Rm:

************0 >

>sample sequence

1 SCN:Rm:

*****1** >

Scan line for incoming signal
from CT797

2 MOVE

sample >

Move needle to sample

3 LIFT: 1

work mm >

Place needle at working posi-
tion

4 CTL:Rm:

************1 >

Set line: Needle immersed in
sample vessel

5 CTL:Rm:

************0 >