Setup & Operation
Model 6650
22
Teledyne
Analytical
Instruments
4)
Note that any adjustment of the display levels will adjust the
20 mA level; therefore only adjust the 20 mA level after
setting the display.
5)
The 20 mA adjustment is located below the display.
6)
With the display reading 1000 counts the 20 mA signal
should be 12.000 mA
7)
Adjust the 20 mA level until the 4-20 mA output is 12.000
mA.
8)
Adjusting the 20 mA level after Mode 2 initialization is not
recommended.
5.8 Diagnostics
5.8.1
Front Panel Lamp Diagnostics
The MSR DET STATUS and REF DET STATUS lamps show the
relative signal energy present. When the LED’s change their colors or go
from constant to flashing this is an indication that the energy levels on
the appropriate detector has changed. Reasons for changes in the LED
output could be feed stock changes, filter attenuation, flow cell/probe
fouling or broken fibers.
The signal levels on the measure and reference channels are shown
by the MSR DET STATUS and REF DET STATUS lamps. (Refer to
Figure 3-1)
1)
If both lamps show steady or flashing green, the energy
levels are sufficient and no change is needed.
2)
If either lamp shows red, the photomultiplier of that channel
is overloaded.
3)
If either lamp shows steady orange, the energy level of that
channel is at the low limit for the high measurement range.
Cables, filters, and cell should be checked and the energy
level should be improved, if possible, to give a steady green
indication.
4)
If either lamp shows flashing orange, the energy level of
that channel is below the reliable measurement range. The
optical system must be revised, to bring the lamp indication
back to steady green, if possible.
