percent of the full scale reading in ambient temperatures varying
from 2 degrees C to 57 degrees C 35 degrees F to 135 degrees F.
Operating mechanisms shall withstand, without affecting gage
accuracy or damage to the instrument, surges equal to 100 percent
above or below the entire scale range. Gages shall be calibrated
prior to installation and shall require no further calibration or
adjustment other than setting the pointer to zero. Provide gages
with a single pressure connection to the diaphragm, or bellows.
Provide pressure connections with a 3-way stopcock which will
permit checking of the zero setting and calibration at any time
without breaking service connections.
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NOTE: Select the applicable paragraph(s) from the
following
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[e.
A carbon dioxide recorder which shall measure, record, and
indicate the percentage by volume of carbon dioxide (CO2) detected
in the flue gas. The recording unit shall be flush mounted and
furnished with locking device and master key.]
[e.
Provide complete oxygen analyzer system to measure oxygen content
of flue gases generated by combustion of [gas] [or] [oil] as
specified in paragraph entitled "Boiler Plant Controls and
Instruments" herein for each boiler. The output of the analyzer
shall range from zero to 25 percent oxygen. The analyzer shall
include the following:
(1) Provide complete aspirating system with proper connection to
stack, necessary steam or water aspirating facilities, and piping
of proper specification to analyzer. Provide piping in accordance
with the oxygen analyzer manufacturer's recommendations and
install tight. Install equipment install in accordance with
manufacturer's instructions.
(2) Provide a paramagnetic analyzer. Analyzer shall provide
oxygen analysis in the zero to 25 percent oxygen range, and have
means of calibration. Provide zero range and span adjustments as
required.
(3) Analyzer output and recorder input shall be compatible.
Provide necessary transducers, connect, and place in proper
operation. Follow special instructions relating to electrical
transmission between analyzer and recorder as to the application
of shielded wiring in conduit.
(4) Check system with two calibrating gases as follows: (a) 100
percent nitrogen, and (b) 3.5 percent oxygen and remainder
nitrogen.]
[e.
Direct Probe In Situ Type: Oxygen analyzer shall be the direct
probe type utilizing an in-situ zirconium sensing element.
Determine flow characteristic and insert element in location where
flue gas is in transition and is representative. Sensing element
shall be contained within a protective shield mounted to the
ductwork by means of an adapter plate, all furnished by the
manufacturer. Analyzer shall be equipped with a facility to allow
daily automatic calibration check without removing the analyzer
SECTION 15517N
Page 15
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