Metrohm 730 Sample Changer - Manuel (Page 57)

3.6 User Methods
730 Sample Changer, Introduction 54
Method: parallel
This is a method for titrations with two Titrinos simultaneously on two towers (parallel
titration). Prerequisite for this is a 2-tower sample changer, the 6.2141.030 remote
control cable and a 12 or 24 place sample rack, since the rack positions must be ac-
cessible to both towers simultaneously. The rotating nozzle is employed for rinsing the
electrode.
'pa
730 Sample Changer 0120/02 187 730.0013
parameters
method parallel
number of samples:
∗
>start sequence
1 CTL:Rm: INIT
>sample sequence
1 MOVE 2 : sample
2 LIFT:
∗ : work mm
3 STIR: ∗ : ON s
4 CTL:Rm: START device ∗
5 SCN:Rm : Ready ∗
6 STIR: ∗ : OFF s
7 LIFT: ∗ : rinse mm
8 PUMP 1.1 : ON s
9 PUMP 2.1 : 3 s
10 PUMP 1.1 : OFF s
11 WAIT 5 s
12 SAMPLE: + 2
>final sequence
1 MOVE 2 : spec.2
2 LIFT:
∗ : work mm
>changer settings
rack number 0
lift rate 1 25 mm/s
lift rate 2 25 mm/s
shift rate 20
shift direction: auto.
beaker test mode: both
on beaker error: display
>stirring rates
stirrer 1 3
stirrer 2 3
stirrer 3 3
stirrer 4 3
>dosing unit def.
>manual stop
CTL Rmt: STOP device
∗
CTL RS232:
------------
- infinite number of samples (until <STOP>), must be
modified (--> number of samples / 2).
- place first sample in front of tower 2 (second sample in
front of tower 1)
- both lifts to the work position
- start both Titrinos
- wait for end of both titrations, static "ready" signal from
both Titrinos
- both lifts in rinsing position
- switch on rotating nozzle on tower 1
- switch on rotating nozzle on tower 2 for 3 seconds
- stop rinsing process on tower 1
- let drip for 5 sec
- raise sample beaker position by 2 positions
- direct conditioning beaker to tower 2
- both lifts in work position, immerse electrodes
- test for missing beakers on both towers
- If sample beaker is missing, interrupt, display an error
message
- stop both Titrinos if a manual stop occurs