2.6.6
Electric Drive
a.
Electric drive shall be provided for jackshaft and flue gas
dampers. Electric drive shall accept signal input from control
system and provide feedback of actuator position by means of
integral potentiometer. Electric drive shall include four
adjustable end switches.
b.
Electric drive shall have 90 degree rotation in 15 seconds and be
capable of [_____] Newton Meter ft-lbs of torque under continuous
duty.
2.6.7
Pressure Transmitter
A pressure transmitter shall have 0.25 percent of full scale accuracy,
process fluid isolating diaphragms, 5:1 field calibration adjustability,
NEMA 4 housing and 4-20 mA dc output. Pressure transmitter shall be
provided with a calibration valve manifold. Pressure transmitter for steam
service shall include an isolating syphon. Following transmitters shall be
provided:
a.
Steam pressure (one per plant).
b.
[Fuel oil pressure].
c.
[Natural gas pressure].
d.
Furnace draft.
2.6.8
Differential Pressure Water Level Transmitter
a.
Boiler shall be provided with differential pressure type water
level transmitter.
b.
Differential pressure type water level transmitter shall have 0.25
of full scale accuracy, process fluid isolating diaphragms, 5:1
field calibration adjustability, NEMA 4 housing and 4-20 mA dc
output.
c.
[Smart transmitters may be used to communicate to associated
controllers on a device level network LAN. Smart transmitters
shall not reside on the controller LAN.]
2.6.9
Pressure Switch
Pressure switch shall have repetitive accuracy of plus or minus 1 percent
of the operating range. Pressure switch actuation shall be adjustable over
the operating range. Pressure switch shall have snap-action Form C
contacts rated for the application.
2.6.10
Temperature Switch
Temperature switch shall have repetitive accuracy of plus or minus 1
percent of the operating range. Temperature switch actuation shall be
adjustable over operating temperature range. Temperature switch shall have
a snap-action Form C contacts rated for the application.
SECTION 15561A
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