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OPAC20/20
Purchase Specifications
Definition
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Purchase specification describes
a double pass opacity monitoring system that uses a green LED (light
emitting diode) light source. The opacity system must meet the
FEDERAL REGISTER, 40 CFR, Pt. 60, App. B, Performance Specification
1, for opacity monitors. Phoenix Instruments, Inc. model OPAC20/20
compliance opacity monitor or equivalent.
Comments to Specifications
System must
at a minimum include the following:
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Be year 2000 compatible.
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Double pass measurement
technique. Window cleaning will be accomplished by quick disconnect
latch, swing away housing. Alignment pins shall be provided to assure
no change in alignment.
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No moving parts such as low or
high speed choppers, or calibration solenoids shall be incorporated
into the light-source housing. Calibration must be non-continuous and
not of the rotating calibration wheel or fiber optic type.
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Weather cover with filtered air
purge system, integral fail safe shutters, and air flow switch for
purge air supply malfunction.
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Dedicated audit and zero
reflector jig with system serial number. Zero jig must use locator
pins to assure repeatability and must adjust and lock to match clear
stack zero.
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Green LED (light emitting diode)
light source with electronic, solid state modulation above 2KHz.
Incandescent lamp and laser sources are not allowed.
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Optically isolated RS-422 digital
communications between stack mounted equipment and remote control unit.
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Non-interfering direct thru the
lens alignment system with no moving parts on both the light-source
and retro-reflector.
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Electronic alignment detector
that will alarm on the remote control unit when system misalignment
effects the opacity readings.
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Remote Control Unit (RCU) with
dual line display. Viewable, printable log files for; system faults,
PLCF (path length correction factor) changes, daily calibrations, and
start up times. Must have RS-232 and current loop outputs. Software
must have user selectable lockout password.
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System must have no potentiometer
or other mechanical signal adjustment on any electronics.
Opacity
System Components
Transceiver and Retro-reflector
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Double pass measurement technique
with Solid State LED light source with greater than 2000 Hz
modulation frequency is required. Moving parts such as calibration
solenoids or rotating choppers are not allowed in the light-source housing.
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Window cleaning will be
accomplished by quick disconnect latch, swing away housing.
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Alignment verification, must be
direct sight TTL (through-the-lens) system, on both the light-source
and retro-reflector with no moving parts and have electronic
alignment detector with remote control unit warning . Alignment must
provide 3 point adjustment.
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Remote Control Unit can be placed
up to 4000 feet (1220 meters) from stack sensor. Signal from sensors
to the remote control unit must be RS-422 optically isolated digital link.
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Stack mounted parts shall install
on a 4" or 6" inch 150 # pipe flange. All stack mounted
components must be contained within the weather enclosures.
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All system stack functions shall
be performed from the light-source weather enclosure electronically
with no manual mechanical or signal adjustments . The functions that
are performed electronically must include; clear stack set,
calibration set, system linearization, and service warning to remote
control unit.
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Light-source weather enclosure
must have a back lit LCD readout of opacity that is path length
corrected using the remote control units PLCF setting. The opacity
readout must operate during all system modes of operation; normal
operation, calibration, service, or audit.
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Daily calibration must be
non-continuous and not of the rotating calibration wheel or fiber
optic type. Calibrations should be not interfere with stack readings
and occur hourly. Remote control unit should be able to display
realtime stack readings during calibration.
Remote Control Unit
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Microprocessor controlled with
user viewable and programable software. Software must be accessible
through the front panel, require no external computer, and have a
user selectable password.
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Remote control unit must be able
to log system faults, PLCF (path length correction factor) changes,
daily calibrations, and start up times.
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Outputs must be two 4-20 ma and
two RS-232 outputs. Both type of outputs must be able to output data
in instantaneous and averaged formats, calibrations, calibration
drift, PLCF, and window dirt.
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Numeric Digital Display, two
lines of 6 digit LED capable of being seen in high ambient light from
25 feet. Selectable Range 0-100% Opacity in .1 % increments. LED
display must give alphanumeric warnings and faults.
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Non-volatile RAM and must contain
a primary and secondary backup memory with auto-loading capability.
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Signal from control unit to
sensors must be RS-422 optically isolated digital link.
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Software must provide as a
minimum: Stack exit Path-Length-Correction Factor (PLCF), manual on
demand zero/span calibration, calibration time and date set-up, time/
date /year set-up, time stamp all logs and digital data, set up of
all user parameters.
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Control unit must be able to
accept external input to initiate calibration cycle.
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Front panel LED readout must
display opacity, calibration, alarms and faults.
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Alarm levels with time
delay, eight solid state spdt alarm contact relays, all field selectable
Power and Environmental specifications
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Ambient temperature: - 40 to +160 F
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Media temperature: maximum 2000 F
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Stack pressure: - 10 up to + 10
inches H2O
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Moisture: dry to saturated
( non condensing)
Electrical requirements:
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Stack mounted weather enclosures:
115 vac / 30 amps (220v / 50hz available)
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Remote control unit:
			115 vac / 5 amps (220v / 50 Hz available)
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Stack to control unit wiring
required: two shielded twisted pair only.
Manufacturing:
Warranty
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Unit shall be warranted for
twelve months after installation or 18 months from date of shipment,
whichever comes first.
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LED light-source shall be
warranted for five years.
© Phoenix
instruments Inc. 1999
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