Metrohm 774 Oven Sample Processor - Manual (Page 30)

3 Introduction
774 Oven Sample Processor, Instructions for use 24
device label
In order to be able to identify each particular laboratory instrument unambi-
guously (required by GLP) the sample changer can be given an 8-character
identifier made up of letters and/or numbers. Text input is described on
page 59.
program version
The program version (instrument software) cannot be altered. It is shown in
the configuration menu for information.
max. lift way
The maximum lift way is an important safety entry. If a correct entry is made
this ensures that the lift with the working head cannot be moved down too
far; this could cause damage to the needle or the sample vessel. The low-
est lift position to be reached can be entered in mm (measured from the
upper stop position).
A convenient way of determining this position is to set the required height
manually (normal state) with the <Ð> and <Ï> keys. The configuration
menu is then opened and the current lift position in the display can be ac-
cepted in the menu entry 'max. lift way' with the <CLEAR> key.
Important: the entered value only becomes effective after a RESET or
when the instrument is switched off and then on again.
beaker sensor
The tower of the 774 Oven Sample Processor is equipped with an infrared-
beaker sensor which detects the presence of a sample vial in front of the
tower. If the beaker sensor is switched on then this test will be carried out
after each MOVE command.
This entry also only becomes effective after a RESET or when the instru-
ment is switched off and then on again.
3.1.2 Oven settings
The basic settings for the oven affect the various temperatures.
initial temperature
Entry of an initial temperature means that the oven is heated up to the set
temperature immediately after the 774 Oven Sample Processor is switched
on. The initial temperature can also be used as a parameter for the
HEATER command. (HEATER:init°C)
max. temperature
The maximum temperature is used as a safety setting. The entered value
cannot be exceeded. If the oven reaches the maximum temperature during
heating up then an error message is produced and the oven heating is
switched off. This emergency stop prevents the sample from being over-
heated.
temp. correction
The temperature correction allows the temperature control to be adjusted.
This can compensate for any temperature difference which may occur be-
tween the oven temperature and the sample temperature. The temperature
correction has a direct effect on the temperature control. The temperature
which is displayed is always the corrected oven temperature.