The Model 1302 Opacity Monitor Is a High Performance Opacity Monitoring System with Double-Pass Transmissometer

The stack mounting Transmissometer sensor system consists of an optical transceiver mounted on one side of the stack and a retro reflector mounted on the other. The main light source is electronically modulated and projects a collimated beam of light, which is split into a reference beam and a measurement beam. The measurement beam is projected across the stack to a retro reflector, which reflects it back across the stack to the measurement detector. The output of the measurement and reference detectors are transmitted to the control room mounted monitoring unit where all output signals are analyzed. The Model 1302's ratio-measurement technique provides continuous automatic compensation for variations in light source intensity to ensure prolonged instrument accuracy and stability. Since the Model 1302 is insensitive to the absolute intensity of the light source, it is not affected by light source aging.

STANDARD FEATURES:

ALIGNMENT VIEWING PORT - Enables the operator to visually check system alignment at anytime during operation.

DOUBLE PASS MEASUREMENT - Dual beam measurement assures high sensitivity, freedom from errors due to vibration or minor misalignment.

INSENSITIVE TO AMBIENT LIGHT - The solid-state light modulation system eliminates possible interference due to ambient light.

AUTOMATIC LAMP AGING COMPENSATION - All measurements are made on a ratio basis and are thus are independent of the absolute intensity of the light source.

OUTPUT – 4-20mA output; range 0-100% Opacity OR 0-4000 mg/m³ Dust Concentration (option)

OPTIONAL FEATURES:

ANALOG METER – Mirrored scale 0-100% Opacity

DIGITAL DISPLAY – Large bright LED display; range 0-100% Opacity OR 0-4000 mg/m³ Dust Concentration

ALARMS – Alarm for high opacity with time delay, early warning. Both have LED front panel display and potential free contacts.

ON LINE ZERO - A reflector used to check instrument zero without shutting down the process. The same device may be used to conduct EPA Opacity Audits with optional Neutral Density filters.

LONG PATH – Path lengths to 50 feet.

WEATHER COVERS, AIR PURGE – Contact us for a complete list of options

Specifications Model 1302 Dust/Opacity Monitor

Control unit:

Enclosure                                              NEMA 12, dust-tight, 10" x 8" x 6" (25.4 20.3 x 15.2 cm), 10 LBS (4.5 kgs)

* Digital Display                                     5/8 inch (15.9 mm), 4-digit LED, 0-100% Opacity or 0-4,000 mg/m3 Dust

* Analog display                                     0-100% Opacity only

Ambient Temperature Range                   +4 to +52o C (+40 to + 125o F)

Power Requirements                              115 VAC, 50/60 Hz, 1 amp +10%; or 230 VAC, 50/60 Hz, 0.5 amp +10%

Indicator Lights/Contact

Closures:

* 1Early warning & Alarm                        5 amp 115v - 1 amp 220v Adjustable 0-100%/0-4,000 mg/m³

* 1Alarm Time Delay                               Adjustable 0-5 Minutes

* 1Alarm Reset                                       Manual

Standard Output Format                         4-20mA and 0-10 VDC

Exit Correlation (Lx / Lt)                          0.5 (single pass equivalent)

Transceiver/Reflector:

Enclosure                                              NEMA 4 watertight enclosure

Path Length                                           24 inches to 20 feet (61 cm to 5 meters)

Optical System                                      Double Pass

Reflector                                               Type 1 (plastic) reflector assembly

Light Source Aging Compensation           Automatic

Light Source Life                                    45,000 hours (> 5 years)

Ambient Temperature Limits                   -40 to +130°F (-40 to +54°C)

Process Gas                                         Up to 750°F (400°C), standard (higher available)

Alignment Verification                             Built-in through-the-lens system standard

Mounting Flanges                                  3 inch IPS, 150# flange, standard

Ambient Light Immunity                          Solid-state electronic light modulation

Wiring                                                   2 pair twisted shielded cable, 22 AWG

Design and performance:

Peak and Mean Spectral Response         Photopic; 515 to 585 nm, less than 10% of peak response outside the

desired 400 to 700 nm region.

Angle of View                                        < 4.0° from optical axis

Angle of Projection                                 < 4.0° from optical axis

Calibration Error                                     < +2% of full scale

Response time                                      < 1 second

Zero Drift                                               < 1% (24 hours)

Calibration Drift                                      < 1% (24 hours)

Operational Period                                 3 Months

Calibration check                                   * Manual zero and span calibrate with dedicated zero reflector. Zero with

clear stack condition

* Optional equipment – ¹ required for NY option