Schambeck SFD GmbH
Refractive Index Detector RI2012
RI2012 V1.0 06-2013.EN / 28.10.2013
65
http://www.schambeck-sfd.com
16.8 T
HE
H
EATING
C
IRCUIT OF THE
RI2012
In the following chapter the complete specification of the RI2012 heating circuit is put
together.
In the normal measuring mode (NormMode) the temperature is displayed with one
digit (e. g. 27.1 °C). If you want more detailed information you can switch to the
service mode (ServMode) where the temperature is displayed with three digits
(e.g. 27.094 °C).
The temperature sensor will be detected automatically when the instrument is
switched on.
If the heating is switched off the optical bench is operated at a temperature of about
6 °C above ambient temperature due to heat irradiated of electronic compounds.
In the interval from 35 °C up to 55 °C the temperature can be selected in 1 °C steps.
The temperature difference of 6 °C has to be considered. If the heating is activated a
asterisk (*) is shown in the upper left corner of the display.
The heat cartridge used in the RI2012 refractive index detector has an internal
resistance of 750
.
The temperature sensor is controlled by the micro controller. Heating is deactivated
and cannot be activated for one of the following reasons:
a) The temperature sensor does not work or is not connected to the main circuit board.
In this case the error message “noTS” will be displayed.
b) The current temperature of the optical bench is below 9 °C or beyond 65 °C. In this
case the error message “!” will show up and an acoustic signal occurs.
c) If the heating is not switched off properly by the firmware a thermal fuse will switch off
the heating at a temperature of 72°C.
