228 dos/m, O, s – Metrohm 746 VA Trace Analyzer User Manual

Page 379

5.7 Program instructions

746 VA Trace Analyzer / 747 VA Stand

5-228

DOS/M

Page:

O, S

Stand:

Abbreviation:

DOS/

Instructions t/s Main parameters Auxiliary parameters

––––––––––––– ––––– ––––––––––––––––––––––––– –––––––––––––––––––––––––

## .. DOS/M ..... V.added ........mL

Function

Auxiliary solution has been added to the measuring vessel (MEAS).

Parameter

Range; Default value / Meaning

V.added

0.010...999.99 mL; 1.000 mL

Solution volume that has been added

Volume of the auxiliary solution that has been added to the measuring
vessel.

Description

The

DOS/M

instruction is used when an auxiliary solution (e.g. supporting

electrolyte) has already been added to the measuring vessel (MEAS)
before the start of the program and defines the initial volume in the
measuring vessel.

The

DOS/M

instruction is also needed when an auxiliary solution should

be added automatically using a dosing unit (e.g. 665 Dosimat or 725
Dosimat) which, in contrast to the 685 Dosimat or 700 Dosino, can not
be directly controlled by the 746 VA Trace Analyzer. In this case, the
addition must be initiated via the RS232 interface (using the

SEND>RS#

instructions) or via the remote interface (using the

SETCTRL

instruction)

and then confirmed with the

DOS/M

instruction.

Comments

The

DOS/M

instruction can not be used in operation with the 695

Autosampler.

Example

Addition of a auxiliary solution with the 665 Dosimat via the remote
interface:

746 connection:

Connection "Control Lines"

(see section 3.13)

665 connection:

Connection

for external dosing contact

(see 665 Instructions for Use)

Connecting cable: Cable with 25-pin connector, pin 5 (output 1) connected to red

banana plug, pin 25 (0 V) to black banana plug

Setting on 665:

"DIS R" mode with fixed dispensing volume

V.add

Program:

SETCTRL *******1

Start of dispensing at 665 Dosimat

by setting control line 1 active

NOP xxx s

Entry of a wait time until

dispensing

is at an end

SETCTRL *******0

Resetting of control line 1

DOS/M

Auxiliary solution has been added

to the measuring vessel

see also

DOS>M, DOS>A, DOS>F, PDOS>M, SDOS>M, SDOS>A, SDOS>F