Metrohm 885 Compact Oven SC - Manual (Page 36)

4.1 Execution sequences ￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭￭
26 ￭￭￭￭￭￭￭￭ 885 Compact Oven SC
4 Automation sequence
4.1 Execution sequences
This automation sequence is comprised of three sequences:
￭ Start sequence
￭ Sample sequence
￭ End sequence
These sequences cannot be modified. However, the parameters which are
decisive for a determination can be set in order to match specific methods
(see Chapter 7.1, page 51).
Start sequence
This command sequence is run one time after the method has been star-
ted. It is used for conditioning the entire system.
The oven is heated to the set temperature. The tubing system is rinsed
with the carrier gas until all moisture has been expelled. The moisture is
titrated in the titration cell.
The titrator is connected with the 885 Compact Oven SC by means of a
remote cable. The latter starts the conditioning on the titrator through a
control line in the remote cable. Once the titration cell is conditioned, the
titrator switches a signal line to active. This signal line is monitored by the
885 Compact Oven SC.
The following steps are carried out in sequence:
￭ Move to the conditioning beaker
￭ Lower lift, pierce vial
￭ Switch on the gas flow
￭ Start conditioning at the titrator
￭ Heat the oven to the temperature set
￭ Wait while conditioning
The signal line Cond OK must be active for 60 s.
Sample sequence
This command sequence is executed for every sample (or blank). It is
repeated for each sample.
The total number of samples (or repetitions) and the rack position of the
first sample (or blank) are entered when the method is started.
The following steps are carried out in sequence:
￭ Scan the Cond OK signal of the titrator
￭ Switch off the gas flow