Schambeck SFD GmbH
Refractive Index Detector RI2000
SFD101.01.3x.EN / 2014-07-10
65
http://www.schambeck-sfd.com
16.8 T
HE
H
EATING
C
IRCUIT OF THE
RI2000
In the following chapter the complete specification of the RI2000 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 a 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 RI2000 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:
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.
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.
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.
