ELTRA CS-800, Manual

Page: 89 / 158

89
The temperature is set by turning the pot and measuring the set value on
The actual value of the temperature is measured on TP26.
Caution: After changing the temperature set point, it takes some time until the
actual temperature value is stabilized at the new set level.
This is the trimmer in the IR cell module for adjusting the cell temperature. It is
accessible with a screw driver from outside the cell. There is no need to remove
the cell block module from the analyzer’s cabinet in order to adjust the
temperature.
4.2.8.2 Modifications for higher sensitivity (gain) in the low sulphur range
For LS: R101=47k R100 = 3M
4.1 x Standard gain
Recalculation factor = 92.664
For double the normal sensitivity: R101=180k
1.92 x standard gain
Recalculation factor = 39.5
For standard gain.
Recalculation factor = 20.59
4.2.8.3 IRC board and cross-talk
For non-soldered sections, at place of the capacitors C90 to C93, jumpers must be
soldered (short pieces of wire) to connect not used IR outputs to GND.
There is a peak to see on the screen if not available IR cells are selected in the PC
software. For example if an analyzer has one carbon cell only, but the operator
selects the configuration of one C and one S ranges in the PC software, he will see
a sulfur peak on the screen giving also sulfur results although there is no sulfur cell
existing in the IR rack. The reason is cross-talk in the signal cable and in the
multiplexer also due to the high input impedance of the UNI board.
In order to avoid this, the outputs of not existing IR ranges have to be connected to
GND on the IRC board, so that there will be no peak on the corresponding UNI
input and on the PC screen.