Provide two position selector switches for the following:
a.
Power--ON/OFF
b.
Module--ACTIVE/INACTIVE
c.
Cleaning Mode--OFFLINE/ONLINE
Provide momentary contact push buttons for the following:
a.
System--START (green head)
b.
Hopper level alarms
c.
Alarm--ACKNOWLEDGE
Provide auxiliary devices for the following:
a.
Position indication switches on isolation valves.
b.
Hopper level alarms.
c.
Temperature indicators, thermocouple alarm, and switch, to
initiate bypass, at the baghouse inlet.
d.
Temperature indicators and thermocouples at the baghouse outlet.
e.
Temperature indicators and thermocouples for each hopper throat.
f.
Differential pressure gages with pressure switch and audible alarm
for each compartment.
g.
Differential pressure gages with pressure switch and audible alarm
for the baghouse inlet and outlet.
h.
Opacity at baghouse outlet.
2.8.2
Instrumentation and Control Systems
Use solid-state analog circuitry. Assemble circuits using readily
available pretested components making maximum use of integrated circuits.
Gold plate pins and mating connectors on nickel to withstand chemical
attack by ambient atmospheric chemicals. Arrange logic elements on circuit
cards in functional groups so that failure of a single logic circuit or
compartment shall not affect more than one separate functional sequence.
Memory shall be static. Factory assemble, wire, test, and debug circuit
cards using the operating stations and actual plug-in cables for the
system. Test circuit card logic in the completed system for a minimum of
170 hours continuous operation. Provide programming aids to permit easy
field reprogramming of adjustable parameters. Battery power backup may be
approved by the Contracting Officer.
2.8.3
System Electrical Power and Power Supplies
The Government shall furnish one 120 VAC power
source from the station
service. Provide fuses or circuit breakers to
protect each source against
faults, overloads, and power failures. Fuses,
fuse panels, breakers, and
breaker panels shall be readily accessible and
clearly identified. Provide
SECTION 15863N
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