5.
Low draft.
6.
Low efficiency.
7.
High flue gas temperature.
8.
High opacity.
b.
Each alarm condition shall activate separate visual indication to
allow operator to locate cause of alarm. This may be accomplished
with first out annunciator having labeled windows and individual
clearly labeled lights or with microprocessor based English
language alarm message display. Horn shall sound for every new
alarm, even if previously silenced.
c.
Controllers shall be provided with protocol converter/gateways
with EIA ANSI/TIA/EIA-485-A multi-drop communications port for
controller LAN network interconnection to field panel controllers
[and to supervisory workstation.]
2.5.13
Opacity Monitor
a.
Opacity monitor shall be double pass system to provide continuous
stack opacity indication.
b.
System shall consist of transceiver and retro-reflector module
mounted on opposite sides of the stack, and electronic monitor.
c.
Bi-directional digital communications link shall connect
electronics processor and transceiver module.
d.
Transceiver shall be provided with backlit pushbutton for
calibration offline.
e.
Light source and receiver shall be provided with air purge system
for use with plant air.
f.
Electronics shall withstand air failures and shall maintain
on-line service without shutdown. Field-mounted device shall be
in NEMA 4 enclosure.
g.
System shall be suitable for operation on 120 volt single-phase
power.
h.
System shall be in compliance with latest requirements of [_____]
City air pollution control code, [_____] City engineering criteria
for fuel burning equipment and [_____] State Department of
Environmental Protection Opacity Monitoring Requirements.
i.
When performing on-stack calibration, each component of opacity
system shall be checked including: light, source, receiver, optics
on stack and associated electronics.
j.
System shall provide a minimum of two (2) months unattended
operation. At selected intervals the system shall perform fully
automatic, on-stack calibration including zero and span. System
shall automatically and continuously correct the measurement for
variations in temperature, line voltage, lamp aging and component
SECTION 15561A
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