drift. Dirty lens detection system with alarm and four
independently selectable optical density filters with range
switches shall be provided. System shall sample and mold control
k.
The output from the system shall include:
1.
4-20 mADC output.
2.
3. Two digital violation occurrence meters, one for total elapsed
time and one for number of occurrences.
l.
Program shall be as follows: When opacity exceeds setpoint,
instant flashing alert light signals; at 20 seconds, alarm light
lights and contacts close. At 60 seconds, lights and contacts
lock and require manual reset.
2.5.14
Vertical Scale Indicators
Vertical scale indicators shall be 150 mm 6 inches high for steam header
pressure, outdoor air temperature and combustion air temperature.
2.5.15
Digital Indicators
Oversized digital indicators shall be provided for fuel oil flow and gas
flow. [At manufacturer option, controller displays may be used if they
show each value in engineering units, include 16 character alphanumeric
display describing what is displayed and include dedicated bar graph that
can be used for each value.]
2.5.16
Draft Gauge
mounted on panel front. Operating ranges for draft gauges shall be field
verified with normal reading in middle of scale range. Draft gauge shall
include piping between gauge and boiler with three (3) way cocks for
shutoff and zero check.
2.5.17
Recorder
a.
Recorder shall be circular chart type, direct reading having
evenly divided graduation. Charts shall be driven by 120 volt, 60
Hz motors. Pens shall be provided with different color ink and
arranged to pass each other without interference. Each chart
shall show 24 hours.
b.
Recorder shall be capable of recording up to four points.
Recorder unit shall be fully programmable in order that each
channel can be configured to accept 4-20 mA DC voltage,
thermocouple and RTD inputs. Nonlinear inputs shall be linearized
and provisions made for special linearizations.
c.
In addition to recording, recorder shall have provisions for
individual 16 character tags and messages per channel and up to
four integrators which shall be selectable either as reset or
non-reset type. Each channel shall be fitted with two alarms
selectable as absolute, rate of change or deviation.
SECTION 15561A
Page 51