d.
Recorder shall measure the following points:
1.
Steam flow.
2.
Percent oxygen.
3.
Flue gas temperature.
4.
Opacity.
e.
Recorder shall be provided with protocol converter/gateways with
controller LAN network interconnection to field panel controllers
[and to supervisory workstation.]
2.5.18
Totalizer
Eight-digit, non-resettable totalizers shall be provided for: natural gas,
fuel oil and steam flow flush-mounted in each boiler control panel.
Totalizers shall display directly in engineering units. Only powers of ten
(10) shall be allowable as scale factors. Power shall be backed up by a
lithium battery with a life span of not less than 8 years. [Smart
transmitters may be used to communicate to associated controllers on a
device level network LAN. Smart transmitters shall not reside on
controller LAN]
2.6
FIELD DEVICES
The following field devices shall be furnished and installed to provide a
complete working system.
2.6.1
Oxygen Analyzer
**************************************************************************
NOTE: Consider specifying a reference and
boilers at 11,700 kW (40,000 lb/hr) or greater
capacity. Otherwise, delete.
**************************************************************************
a.
Oxygen analyzer shall be provided for each boiler. Oxygen
analyzer shall be stack-mounted and shall utilize zirconium
sensing element. Sensing element shall be inserted directly in
flue gas stream and shall be in direct contact with process gases.
Sensing element shall be contained within a protective housing
mounted to flue gas outlet by means of adapter plate, both
furnished by manufacturer.
b.
Oxygen analyzer shall be equipped to allow daily calibration check
without removing analyzer from process.
c.
Sample gases may be injected directly on sensing element while
analyzer is in process.
d.
In order to eliminate temperature effect of flue gases,
externally-mounted temperature controller shall be provided.
Temperature controller output shall be isolated 4-20 mA DC
representing 0-10 percent oxygen content as linear function.
SECTION 15561A
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