| UV
Lamp Monitor Can Reduce Maintenance Costs |
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| A new UV lamp monitor can reduce maintenance costs by determining exactly when
germicidal lamps in wastewater treatment plants need to be serviced. Since most plants
have no way to determine when buildup on lamps has reduced their effectiveness, they are
typically removed and cleaned at routine intervals that are considerably shorter than
necessary. |
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| The new UW-254 submersible probe and LM100 lamp monitor
continuously monitors relative lamp output from 0% to
100%. They provide a cost-effective and trouble-free method of determining exactly when
lamps need to be removed for cleaning. |
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| The UW-254 is an UV detector designed to monitor up to four mercury lamps with a
radiation peak at 253.7 nm that are commonly used in banks for the final disinfection of
plant effluent. The probe is "calibrated" after initial installation of the lamp
bank and readjusted after cleaning. The
LM100 lamp monitor is adjusted to indicate 100% for clean lamps.
Then appropriate operator alert levels are set for the specified decrease in intensity. The UW-254 detector has a narrow spectral response
from 210-380 nm. It will not respond to sunlight -- or any other visible radiation -- and
offers negligible response to the sun's UV radiation -- nil in service underwater. |
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| As the lamps deteriorate, the LM100 lamp monitor
tracks the lamp output. A warning threshold
can be set to turn on a warning indicator and activate a relay for external control. If
the lamps continue to deteriorate, a second threshold (the error threshold) can be set
which when crossed will turn on an error indicator and set a second relay which can also
be used for external control. Both thresholds
are programmable from 0% to 100% levels. The
input of the LM100 lamp monitor accepts a 4 to 20ma detector (two wire). In addition to the display
and alarms, the monitor has a 4 to 20ma output which represents the 0% to 100% on the
display. This output can be used for remote
monitoring or sent to a data collection system. |
