2.4
AOP CONTROL SYSTEM
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NOTE: Delete items within this paragraph that do
not apply. Not all UV systems (especially those
with low intensity lamps) have light intensity
monitors; verify design requirements for type or
need of lamps. Hydrogen peroxide monitoring on all
but very large plants (larger than 1.5 MGD) will
consist of tank level readings and an indication
that the chemical feed pump is working. Coordinate
with paragraph Alarms and Interlocks if separate
audible or visual alarms beyond the control system
specified are required, and their location.
If an autodialer is required, reference the controls
and instrumentation section of the specification; or
if none is included and an autodialer is required,
include those requirements in this paragraph.
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Equipment shall be locally controlled and shall be capable of receiving
standard digital or analog control signals from the plant central control
system. Status and adjustments to the equipment shall be provided
[locally] [and] [from the plant central control system]. Instruments shall
be provided with mounting hardware as appropriate. Transmitters with
digital outputs shall be accurate to within [_____] percent. All equipment
shall be designed for operation on a 120 volts 60 hertz electrical input.
Controls shall be provided to remotely monitor [and adjust] [hydrogen
peroxide delivery rate,] [oxygen] [air] [and ozone output,] [_____]
[individual lamp failure,] [power on and off status for each lamp
[ballast]] [ultraviolet lamp intensity]. [Each lamp shall be provided with
a nonresettable elapsed time meter with ability to record operable hours
from 0 to 99,999].
2.4.1
Ozonation Control System
The ozonation control system shall be interfaced with the plant central
control system. Changes to the ozone generator equipment operating
conditions shall be accomplished locally or from the master control panel.
The power, control and instrumentation system provided shall be as
specified or as recommended by the ozone generator manufacturer for safe
operation and supervision of the ozone generator and related gas feed
equipment. Schematics and interconnecting wiring diagrams shall be
provided for power, control, and instrumentation circuits. Control power
transformers, relays, adjustable timers, auxiliary contacts, switches, or
additional equipment to interconnect the generator to other auxiliary
equipment and master control panel, and control circuits as shown on
schematic or instrument control drawings shall be provided. An emergency
stop button shall be provided at the local generator control panel. The
ozone generator shall be protected from power surges, and variations in
power supplied to the equipment.
2.4.2
Hydrogen Peroxide Feed
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NOTE: Hydrogen peroxide metering rate is generally
done manually with an interlock to shut the system
SECTION 11377
Page 31
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