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1-46 Part III
Part III Model 6600
Teledyne Analytical Instruments
NOTE: The phototube envelope is very thin quartz for optimum UV
trans mission and therefore extremely fragile. Extreme care must be taken, when
the signal cable is disconnected from its top connector to avoid a leak.
8.0 TROUBLESHOOTING SECTION
8.1 The Lamp Refuses to Light
Possible Causes Remedy
1. The lamp has failed due to long service.1. Replace the lamp as
per Section 7.10.
2. The power supply has failed. Remove the power supply from
its mount, located in the source module and replace with a new unit.
8.2 Water Delivery Problems
8.2.1 The Water Refuses to Flow Through the Tubin
g
This can happens during start-up, after installation of new tubing or when
the system is left dry for a long period of time particularly in gravity fed systems.
The cause may be air trapped in the tubing. The small driving force used to make
the water flow is not able to overcome the resistance offered by an air bubble
trapped inside a dry tube.
Remedy: Force the affected tube to become wet, by opening up the
connector on its down stream side and point the tube downwards to generate a
siphon effect and let the water flow freely for awhile.
The tube sections most often suffering of this phenomena are the tube
connection between the output of the homogenizer and the input of the deaerator
and the tube connection between the zero filter output to the solenoid valve and
from the solenoid valve to the input of the fine filter. The deaerator drain tube
leading to the solenoid valve F
1
and SV
3
must always have a downward slope.