UV Lamp Monitor Can Reduce Maintenance Costs

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. 

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.

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.  It can be strapped to a quartz light tube underwater. 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.

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. The uw-254 is supplied with a 30' cable, and uses 9-25VDC.

Application Notes and Technical Papers:

> Sterilization Through Utilization of Ultraviolet Radiation 168K app104.pdf

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