Rosemount 890, Instruction Manual

Page: 72 / 96

R
OUTINE
S
ERVICE
Rosemount Analytical 748460-A January 2000
6-8
displayed. Secure the lamp clamp (Figure 6-5, item G) and tighten the three lamp
housing screws (Figure 6-5, item A).
7. Refer to Figure 6-6. Loosen the spring-loaded handle mounting screws to allow for
beam alignment adjustments. Note the adjustment mark on the block and beam
alignment housing.
8. Rotate the beam alignment housing to obtain the maximum signal. (The marks
already present just show the proper starting point.)
9. Display the Detector Signal screen in DIAGNOSTICS mode, and adjust the iris for
0 mV
±
5 mV. The cover (Figure 6-6) protects the iris from accidental movement.
10. In RANGE mode, set the gain to "1 high" and repeat step 9 for 0 mV
±
10 mV.
11. In DIAGNOSTICS mode, verify the detector signals are the following (for a new
lamp):
Sample A = 5 V
±
0.7 V
Sample B = Sample A
±
200 mV
Reference A = 75 to 85% of Sample B
Reference B = Reference A
±
200 mV
12. Press SHIFT and ENTER to return to RUN mode.
This concludes lamp alignment and balance of the system.
Restore the original settings for the ranges and calibrate the analyzer.
F
IGURE
6-6. L
AMP
A
LIGNMENT
Handle
Beam Alignment Dial
Adjustment Mark
Aperture Cap
Aperture
Adjustment
Handle