Metrohm 774 - Page 57

5.2 The keyboard
774 Oven Sample Processor, Instructions for use
51
Key Normal state Editing
FLOW
4
Activating/deactivating gas
flow
• Key <FLOW> is used to
activate resp. deactivate the
air pump or the solenoid valve
(Air/N
2
in).
• The first parameter serves to
select pump or valve. The
second parameter defines
status 'On/Off'. The function
must be confirmed with
<ENTER>.
Numeric entry ('4')
or
activate/deactivate gas flow
• The FLOW command serves to
activate resp. deactivate the air
pump or the solenoid valve
(Air/N
2
in).
• The first parameter serves to
select pump or valve. The sec-
ond parameter defines status
'On/Off'.
5
HEATER
Oven control
• Key <HEATER> serves to
set the current oven tempera-
ture.
• The first parameter defines the
oven temperature. With the
second parameter, it is possi-
ble to achieve a slow, time-
controlled heating-up process
to the set target temperature.
You can set a time interval
within which the target tem-
perature should be reached.
The function must be con-
firmed with <ENTER>.
Numeric entry ('5')
or
oven control
• The first parameter defines the
oven temperature (target tem-
perature).
• Using the second parameter, it
is possible to program tem-
perature ramps or (by combin-
ing several HEATER com-
mands) entire temperature pro-
files. The heat-up interval de-
fines the period within which
the set target temperature
should be reached.
DO S
6
Dosing control
• The <DOS> key serves for
the control of Dosimats and
Dosinos. These are controlled
via the "External Bus" connec-
tor.
• The first parameter is for the
selection of the dosing unit.
The second parameter repre-
sents the function.
• In addition to dosing volume
and the fill command, the
functions specific to the Dos-
ino -’prepare’, ‘release,
‘empty’ and 'release'- can also
be executed.
• The dosing and filling speed
can be set in the parameter
menu or with the <DEF> key.
Numerical entry ('6')
or
Dosing control
• In a sequence you can not only
add a certain volume under
process control, it is also pos-
sible to initiate the burette filling
with Dosimats or initiate the
designated functions with Dos-
inos as there are: filling, empty-
ing, preparation or release of
the exchange unit.