percent at a crest factor of 2.0 or less, and a voltage range of not less
than plus or minus 10 percent. Ballast shall be suitable for operating at
[minus 15] [minus 30] [minus 40] degrees C [5] [minus 22] [minus 40]
degrees F and above. Magnetic ballast shall be located and/or enclosed in
an environment not susceptible to the effects of heat, cold and moisture.
Ballast shall be of a modular design allowing for quick disconnect and
replacement by operators.
2.3.5
Cableway
If required by the equipment manufacturer, cable shall be installed in
weatherproof and submersible cableway. The cableway shall be stainless
steel, 1.9837 or 1.5875 mm thick (14 or 16 gauge) 14 or 16 gauge. Cableway
shall be gasketed and completely watertight under a submerged condition.
2.3.6
Instrumentation and System Controls
2.3.6.1
Controls
Equipment shall be of the fully automatic program control type and shall be
capable of receiving standard 4-20 mA control signals from the plant
effluent flowmeter. Control of 2 or more banks of modules shall be
accomplished by turning lamp banks on and off in proportion to flow
variations. Controls shall continuously adjust the UV intensity
automatically in proportion to wastewater flow. Controls shall require no
manual attention other than adjustment of the required UV intensity.
2.3.6.2
Lamp Status Indicators
a.
Indicators shall indicate the status whether ON/OFF of each lamp
in the module being powered.
b.
Indicators shall indicate the status "POWER ON", only, in each
module.
c.
The lamp monitoring system shall indicate the geometric location
of each individual lamp and operating status of each lamp by means
of a neon lamp or alpha-numeric data display (LED or LCD). Upon
lamp failure, the corresponding lamp shall be illuminated and
contact closure shall occur for remote alarm annunciation.
Contact closure for remote annunciation shall be provided to
indicate lamp module failure due to ground fault interruption.
2.3.6.3
UV Intensity Detection System
a.
A submersible UV sensor shall continuously sense the UV intensity
produced in each bank of lamp modules. The sensor shall measure
only the germicidal portion of the light emitted by the lamps
within the channel between 254.5 and 255.0 nm. The UV intensity
shall be displayed on the intensity meter. Each UV intensity
probe shall be located at a point of minimum expected intensity
within the lamp array. The probe shall mount to any lamp in the
array and shall be clip-on and self-aligning to assure the proper
spacing from the tube without necessity of handtools. The probe
shall be factory calibrated with verification in the field prior
to startup. The UV equipment manufacturer shall provide
justification for the sensor location.
b.
One UV intensity meter shall be provided per bank of lamp modules.
SECTION 11376
Page 17
Previous Page
