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Microprocessor Control Descriptions
Incoming AC Voltage Monitor
The Incoming AC Voltage Monitor monitors the input voltage to the UV system. If the value goes outside the acceptable
threshold an alarm will be activated. For 120 VAC the threshold parameter is 95 – 140 VAC, for 230 VAC the threshold
parameter is 210 – 260 VAC. Your unit's input voltage parameter is identified on the power supply enclosure and vessel label.
Total Operating Hours Meter
The Total Operating Hours Meter measures in increments of one for each hour the unit is in operation. The hour meter may
be reset by the operator using the appropriate SETUP Text Display. The hour meter will roll over at 65,536 hours if not reset
prior to reaching this number.
Lamp Status & Lamp Life Monitor
The Lamp Status & Lamp Life Monitor scans all active lamp inputs from 1 to 13 depending on the UV system's number of
lamps. If the Microprocessor Controller detects an inactive lamp an alarm will be activated and the ALARM Text Display will
identify which lamp is malfunctioning. The alarm may be reset but will continue to activate every twenty-four (24) hours until
the lamp is replaced and the SETUP individual lamp reset is completed.
Each lamp is equipped with an individual hour meter, stored in EEPROM for data retention on power removal. At the end of
each hour when the "Total Lamp Hour Meter" is incremented, all active lamps will have their individual hours monitored. Each
individual lamp's hours will be monitored for End of Lamp Life (12,000 hours) and a 72 hour recurring alarm will also be set.
Power Supply Enclosure Temperature Monitor
The Power Supply Temperature Monitor uses a temperature sensor mounted inside the UV system's Power Supply Enclosure
that monitors the enclosure's internal temperature. The temperature monitor is used to protect the UV system's electronics
from overheating, a condition that could damage the unit. The enclosure's factory-set temperature threshold is 140º F. If the
enclosure's internal temperature reaches 140º F the Microprocessor Controller will shutdown the lamp field and activate an
alarm. The Microprocessor Controller must be powered off to reset the system and to restore lamp field operation.
UV Vessel Water Temperature Monitor
The Water Temperature Monitor uses a sensor located on the UV vessel that monitors its internal water temperature. The UV
Vessel Water Temperature Monitor is used to protect the vessel from no or low-flow conditions that may allow the lamp field to
overheat causing damage to the UV vessel. The UV Vessel Water Temperature Monitor's factory-set threshold is 120º F and
if reached, will cause the Microprocessor Controller to shut down the lamp field and activate an alarm. The Microprocessor
Controller must be powered off to reset the system and to restore lamp field operation.
Additionally, if the water temperature sensor cable is interrupted/disconnected the entire UV system will shutdown and
activate an alarm. The Microprocessor Controller must be powered off to reset the system and to restore lamp field operation.
UV Intensity Sensor
A UV Intensity Sensor is provided to monitor the quality of the UV energy that is being produced inside the unit's vessel. The
Microprocessor Controller monitoring system displays the UV intensity as a function of percent (0%-100%), this UV intensity
measurement is a relative power measurement of the UV energy inside the vessel and not an absolute measurement of
UV dose because UV dose is a function of flow, the transmissibility of the water being treated, and the total UV power being
applied to the flow path inside the UV vessel. The relative UV intensity (power) must be calibrated in order for the intensity
measurement/reading to have any useful meaning. This calibration process is done once the system has been in service for
100 hours, the calibration screen will show a value representing percentage of UV. A button on the screen will allow setting of
the 100% reading.
Lamp Field Safety Cover
On all NSF-50 certified units there is a safety cap that covers the lamp's electrical cables that terminate into the unit's quartz
sleeves. This safety cover must be installed into the vessel with its respective cable properly connected to its respective
port located on the power supply enclosure. Removing the Lamp Field Safety Cover or a cable connection interruption will
automatically shut off the UV system's lamp field and generate an alarm signal.
Alarm Relays (standard)
A discrete output relay circuit (200 milliamp, normally Open "Form A" contact) is provided to allow for alarm enunciation of
any of the following monitored conditions: lamp failure, low UV intensity, vessel water over-temperature, enclosure over-
temperature, end of lamp life, under/over input voltage alarm and lamp field safety cover. These two yellow terminal blocks
are located inside the main control enclosure. The relay will Close when any alarm is triggered.
4-20 Milliamp Output (Optional)
Typically this option is added to the UV intensity circuit, so the UV intensity can be sent to an external recording device. This
option can also be added to the temperature circuit or the flow circuit (if equipped). The Red (+) and Black (-) terminal blocks
are the 4-20 milliamp contact connections.
Note: This option MUST be purchased with original equipment.
BIOSHIELD™ Commercial UV Disinfection System Installation and User's Guide
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