7.
Current Limit:
To approximately 30 mA.
d.
Steam flow meter-transmitter shall meet following materials of
construction criteria:
1.
Sensor:
Type 316 stainless steel.
2.
Sensor Support:
Type 304 stainless steel.
3.
Bushings:
Stellite or stainless steel hardened with stellite.
4.
Stem:
300 Series stainless steel.
e.
Provide with steam flow meter-transmitter a full port gate valve
with proper flanged connection that allows steam flow sensor to be
inserted and removed from pipe under full pressure. Both valve
and pipe tap shall have a minimum [48 mm 1.875 inches] [_____]
internal diameter clearance.
f.
Electronics enclosure shall be NEMA [4] [4X].
g.
Smart transmitters may be used to communicate to associated
controllers on device level network LAN. Smart transmitters shall
not reside on controller LAN.
2.6.5
Temperature Transmitter
a.
Platinum resistance temperature detector (RTD) temperature
transmitter shall be provided. Resistance shall be 100 ohms at [0
degrees C 32 degrees F] [_____] with tolerances per BS 101-4 and
DIN 43760.
b.
Connections to control cabinet shall be via three identical copper
conductors of No. 14 AWG minimum.
c.
RTD shall be inserted in protective sheath or well suitable for
the environment.
d.
Transmitter shall utilize platinum RTD input to provide 4-20 mA dc
output to control cabinet. Transmitter shall be plus/minus 0.2
percent accuracy of calibration span, to include combined effects
of transmitter repeatability, hysteresis, linearity and adjustment
resolution.
e.
[Smart transmitters may be used to communicate to associated
controllers on device level network LAN. Smart transmitters shall
not reside on controller LAN.]
f.
The following temperatures shall be monitored.
1.
[Fuel oil (each boiler)].
2.
Flue gas (each boiler).
3.
Combustion air (each boiler).
4.
Outdoor air (one (1) per plant).
SECTION 15561A
Page 54
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