Metrohm 789 Robotic Sample Processor XL - Manual (Page 137)

6.2 Standard methods
Metrohm Sample Processor, Annex 129
6.2.1 Titrino
This is a universal method for carrying out automated titrations directly
in the sample beaker. It is extremely suitable for use as a template for
further methods.
Required instruments and cables:
• Metrohm titrator (Titrino or Titrando with 6.2148.010 Remote Box)
• Metrohm 802 Rod Stirrer or 741 Magnetic Stirrer
• 6.2141.020 Remote cable
The method can be used with or without a 786 Swing Head on the
Sample Processor.
Special features:
After the titration the electrode is rinsed in the sample beaker (rinsing
position). The rinsing position at Lift 1 must be set in the rack configura-
tion so that the electrode is not immersed in the sample solution. An in-
ternal or external pump is required for rinsing.
789 Sample Proc. XL 11122 5.789.0011
parameters
method Titrino
number of samples: rack
>start sequence
1 CTL:Rm: INIT
>sample sequence
1 MOVE 1 : sample
2 LIFT: 1 : work mm
3 STIR: T1 : ON s
4 CTL:Rm: START device1
5 SCN:Rm : End1
6 STIR: T1 : OFF s
7 LIFT: 1 : rinse mm
8 PUMP 1.1 : 5 s
9 WAIT: pause 3 s
>final sequence
1 MOVE 1 : spec.1
2 LIFT: 1 : work mm
>changer settings
rack name: *
lift rate T1 25 mm/s
lift rate T2 25 mm/s
shift rate 20°/s
shift direction: auto
swing rate T1 55°/s
swing rate T2 55°/s
on beaker error: MOVE
>stirring rates
stirrer tower 1 3
stirrer tower 2 3
stirrer MSB1 3
stirrer MSB2 3
stirrer MSB3 3
>Dosing unit def.
>timeout settings
SCAN timeout: OFF min
on SCAN timeout: error
>manual stop
CTL Rmt: STOP device*
CTL RS232:
PUMP: cont.
- Report header with instrument ID and program version
- Method name
- No. of samples (here whole sample rack)
- Initialize Remote interface
- Move to sample
- Run lift to working height
- Switch on stirrer at Tower 1
- Start titrator
- Wait for end of titration
- Switch off stirrer at Tower 1
- Run lift to rinsing height
- Rinse electrode for 5 seconds
- Allow electrode to drip
- Move to conditioning beaker
- Run lift to working height
----- Settings for Sample Processor functions -----
------ Stirring rates -----------------
-------- Settings for dosing devices----------------
-------- Settings for interface timeout ------
-------- Reaction to manual stop ---------------
- Stop titrator
- Do not alter pump status