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COMPARISON OF LASER MONITOR
WITH LED MONITORS
Ducon LM3086EPA3 provides the highest Accuracy and Long-Term Reliability
Available for Opacity and Dust Measurements. An EPA-certified monitoring
system, the monitor is a lightweight, efficient solution for determining
opacity or dust concentration in stack gases. Proven in more than 500
installations worldwide, it advances the state of opacity monitoring with
higher levels of accuracy, flexible installation and reduced long-term
maintenance
It is based on a low-power laser with excellent beam
collimation and intensity that can sustain path lengths up to 300 feet in
many situations. It does not require factory calibration like
conventional opacity monitors In addition, the single-pass, dual-path
design reduces maintenance and quality assurance labor hours.
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Simulated Zero
& Upscale Calibration System:
A proprietary, DopperTM, design steers laser beam alternatively through
effluent, calibration filters and optical reference fibre 40 times in
second.
Laser power reference, zero, upscale calibration, window dirt and
Effluent opacity updated every 25 millisecond. Zero, cal. and window data
stored & displayed automatically at Preset intervals or viewed on demand.
Process Interface:
Mechanical: 4”, 150# Flange
Stack pressure: +10” H20 max; Stack temperature: +1200°F max
Purge flow: 3-20 CFM; Path length: 1-200 ft
Purge switch and failsafe shutter built-in for the laser unit,
Optional for the receiver unit.
Environmental, Power and
Mechanical
Ambient temperature: -40 to 150°F; Power/Blower: 110 VAC
Power/Stack units: 110 VAC, 40 VA
Dimensions/Laser unit: 20.2x16.3x9.5”, 40 lbs (wo flange)
Dimensions/Receiver unit: 6.4x6.4x3.6”, 10 lbs (wo. flange)
Monitor Unit Data
Transmissometer input: Digital serial communication
Display: Dual 16-character alphanumeric LCD
Controls: Eight pushbutton switches
Alarms & mode indicators: 7 relays with dry contacts and indicator
LED’s for: Warning limit; Alarm limit; Window limit; Zero mode in
process; Cal. mode in process; Purge alarm System fault; System fault
specified with display text (Laser power, chopper motor, cal. fault,
stack power loss etc.).
Outputs/Inputs:
CH1: 4-20 mA for real-time opacity; CH2: 4-20 mA for Averaged opacity;
Optical density; Mass concentrations; RS 232C for printer, PC or
mill computer connections; External trigger input for auto zero &
cal.
Operational Modes:
Diagnostic mode; Main Monitoring mode
Auto zero & Cal. Mode; Manual modes (5)
Set-up modes (13); Special/Service/Audit modes (9)
Set-Up Parameters:
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Name
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Range
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Increments
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Defaults
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Span
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10-100%
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1%
|
100%
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Zero/C. int
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1-99
h/min
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1
h/min
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24 h
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Zero Time
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1-99s
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1s
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30s
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Cal Time
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1-99s
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1s
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30s
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Ave Time
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1-99
min
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1
min
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6
min
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Win Limit
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1-99%
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1%
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4%
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War&Ala
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1-99%
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1%
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15&20%
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SEC
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0.1-2.56
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0.1
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1.00
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Mass Co
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1-65000
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1
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800
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In addition there are
“short-cut” set-ups for display (opacity, optical density,
mg/m3, mgr/ft3) or averaging (show previous,
show running average). All sensitive set-up data is password-protected.
Stored Data:
128 last averages; 32 last zero values; 32 last calibration values
32 last window values; 32 last stack exit corrections; Audit log
(Date/Time
and filter values for the 3 last audit sessions); System log (Date/Time
of
last power loss, stack exit set-up & system fault).
Environmental, Power and
Mechanical
Ambient temp.:32 to 160°F
Power: 110 VAC, 40 VA; Size: 19” rack design, 19x10.5x5.2”
Weight: 8 lbs (3,6 kg); Tabletop cover optional
for non-rack installation.
Download PDF
View Demo
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Laser Technology and Fiber optic zero pipe provides
continuous zero and span correction
On-stack
Audit feature. No need to remove monitor from stack
Window
dust correction on all surfaces so no excess reporting due to dust on
optical surfaces
Low
cost of ownership and long term trouble free operation
LaserSOFT2003 software available for EPA
reporting, monitor diagnostics and remote access.
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SPECIFICATIONS LM3086EPA3
Transmissometer data
Principal of operation: Single-pass,
dual-path, laser based Transmissometer with optical fiber reference.
Measurement Functions and
Ranges:
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Function
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Range
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Resolution
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|
Opacity
%
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0-100.0%
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0.1%
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Optical
Density
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0-3.000
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0.001
OD
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mg/m3
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0-100
000.0
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0.1
mg/m3
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mgrains/ft3
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0-100
000.0
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0.1
mgrains/ft3
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Note: Mass
concentration ranges depend on path length and on particulate
characteristics; System span can be set from 10 % to 100 % full scale
with 1 % increments.
Design and
Performance Specifications:
Source type: Laser, 0.5 mW, dia 0.8 mm at exit
Spectral response: 543 nm, monochromatic
Angular response: Less than 0.06 degrees
Background sensitivity: Negligible, <0.2 % OP
Scattering contribution: Negligible, <0.2 % OP
Calibration error: <+/- 2 % (<0.5 % typical)
Cal. & zero drift:
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PS-1 Test
Time
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1h
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24h
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336h
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Calibration
Drift
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<0.2%
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<0.2%
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<0.2%
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Zero
Drift
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<0.2%
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<0.2%
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<0.2%
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