Schambeck SFD GmbH
Refractive Index Detector RI2000
SFD101.01.3x.EN / 2014-07-10
50
http://www.schambeck-sfd.com
16.2.3
I
NTENSITY
A
LARM OR
S
IGNAL
#
TOO LOW
/
S
IGNAL
#
TOO HIGHT
The intensity alarm message can show up directly after initialization of the instrument or
during operation. There are two different ways of displaying this message.
It is normal that you get no beep from the RI2000 refractive index detector when you press
the
AutoZero
or
PURGE
button while the ‘INTENSITY’ or ‘intensity’ error message is shown.
In this case it makes no sense to press the
AutoZero
or
Polarity
buttons when there is no
signal value shown in the display. The functions
AutoZero
and
Polarity
are only active if
there is a detector signal.
Is the message “intensity”
OR
“S
IGNAL
#
too
low”
displayed, the voltage U
Summ
is below 1.7 V.
The reason is low light intensity reaching the light sensor. To resolve this problem, try the
following:
Purge the reference chamber and the sample chamber of the flow cell and make sure that
both chambers are filled with mobile phase
Check the light source (
see chapter 16.4
Make sure the flow cell is clean (
see chapter 16.7
)
Adjust the alignment of the optical system (
see chapter 16.3
Check the lamp current, it might be too low. (
see chapter 16.4 and page 58
)
In case of the message “INTENSITY” (all capital letters) or “
S
IGNAL
# too hight”
the problem
is that the voltage U
Summ
is beyond 7.5 V. This might be caused by several facts:
The lamp current is too high, check lamp current
The cover of the optical system is open and light from outside reaches the light
sensor
