[75] [50] mm [3] [2] inches. Ports shall be located to allow viewing the
pilot flame, the base of the main flame, and a view of each of the
thermocouples.
2.14.2
Inlet Sample Port
Inlet sample port [50] [_____] mm [2] [_____] inches minimum diameter, with
cap and cooling holes, shall be located upstream of all contributing flows,
with the exception of the off-gas.
2.14.3
Outlet Sample Port
Outlet sample port [50] [_____] mm [2] [_____] inches minimum diameter,
with cap and cooling holes, shall be located [upstream of the cooling or
dilution air inlet] [and] [two stack diameters from the top of stack].
2.14.4
Sampling Equipment
**************************************************************************
NOTE: Add sampler requirements.
**************************************************************************
The Contractor shall provide the following equipment:
[_____].
2.15
CONTROLS
**************************************************************************
NOTE: Blower controls are in Section 11215A
FANS/BLOWERS/PUMPS; OFF-GAS. Omit last sentence if
not applicable to the project.
**************************************************************************
Set points, signals and control functions and dampers shall be linked by a
central programmable logic controller (PLC) located in the control panel.
Control signals shall be 4-20 ma or 0-10 Vdc, compatible with the
controller and sensor or control device. Burner control diagnostics shall
be included. For parameters specified to be continuously recorded, digital
data shall be recorded at intervals not exceeding one minute. Sensors
shall be calibrated with standards traceable to NIST and in conformance
with NIST SP 250. Each alarm shall be connected to an [auto-dialer] [or]
[telemetry] system.
2.15.1
Ultraviolet (UV) Flame Scanner
Ultraviolet scanner shall be furnished, installed and calibrated to provide
for safety shutdown on the absence of flame. The signal from each scanner
shall incorporate a time delay appropriate to the control sequence. The
burner flame scanner shall monitor the burner flame. The pilot flame
scanner shall monitor the pilot flame.
2.15.2
Timers
Automatic timers shall provide independent adjustment of the start and
duration of each step in the control sequence.
2.15.2.1
Purge Timer
The minimum purge cycle shall be set at four changes of [air] [or] [inert
gas]. Purge cycle shall have both automatic and manual start.
SECTION 11378
Page 22
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