DSL-460 MkII
Double Pass Opacity Monitor for monitoring opacity and particle emissions
The DSL-460 Opacity Monitor is an optical instrument designed to measure the visual opacity and/or concentration of dust or particulate matter in an exhaust gas passing through a duct, stack or flue.
DSL-460 MkII
The DSL-460 uses the double pass light transmission measurement technique, with a folded beam Transceiver/Reflector arrangement. A light beam emitted from the Transceiver (TRX) passes across the duct, stack or flue to a Reflector, which then returns the light to the Transceiver where the intensity of the received light is measured.
Increased particulate density in the stack gas attenuates the transmitted light and causes the intensity of the received light to fall. This reduction in intensity can be presented as % opacity or when calibrated against standard reference measurements, this reduction in intensity can be used to calculate the particulate concentration and present a reading in mg/m³.
Optional accessories
- DSCU operator interface with dual parameter display
- 90-260 Vac model available
- Mounting flange installation kit
- Air purge blower kit (110 Vac / 230 Vac / 415 Vac)
- Compressed air purge kit
- Reference filters for routine calibration check of the instrument
- External weather covers for TRX and Reflector heads
Features
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In situ measurement directly in exhaust gas flow
-
Measurement reading as % opacity and/or particulate as mg/m³
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Modulated green LED source for long lifetime stability and immunity to ambient light
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Rugged 316 stainless steel construction
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Integrated visual alignment aid to simplify installation
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In-situ zero and calibration check facility
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‘Intelligent’ sensor with optional DSCU operator interface with dual parameter display
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Choice of interface options enabling easy integration
Benefits
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Plug and socket connectors for ease of installation
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Simpler installation than single pass opacity monitors with better accuracy over shorter path lengths
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Rugged design with no moving parts so low maintenance
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Latched head design to enable ease of access to optics for maintenance
Specification
Measurement Performance
No. | Parameter | Units | Min | Max | Comment |
---|---|---|---|---|---|
1 | Path Length (flange to flange) | m | 0.5 | 10 | Flange-to-flange separation |
2 |
Measuring Range - Opacity Particulate Density |
% mg/m3 |
0.0 0.0 |
100.0 1000.0 |
User selectable (Optical Density also available) |
3 | Accuracy | % | -2 | +2 | |
4 | Resolution |
% mg/m3 |
0.1 0.1 | Display resolution | |
5 | Damping | s | 1 | 60 | Selectable |
6 | Drift with Temperature | % | -2 | +2 | Over the full operating temperature range |
7 | Operating Wavelength | nm | 510 | 540 | Green LED |
8 | Visual Alignment Aid | % | -1 | +1 | To first target in the reticle |
Power & Air Requirements
No. | Parameter | Units | Min | Max | Comment |
---|---|---|---|---|---|
9 | Voltage | Vdc | +24 | Optional 90-260 Vac PSU available | |
10 | Voltage Tolerance | % | -10 | +10 | |
11 | Nominal Current Consumption | mA | 500 | ||
12 | Power Up Current Consumption | mA | 500 | ||
13 | Air Supply Volume Flow | L/min | 50 | 200 | To each air-purge body |
14 | Air Supply Fitting | 1” BSP threaded aperture in each air-purge body |
Interface Options
No. | Parameter | Units | Min | Max | Comment |
---|---|---|---|---|---|
15 | Serial Comms |
ModBus RTU via RS485 (OI or TRX) Internal USB (OI), external USB (TRX) | |||
16 | Analogue Output (one) | mA | 0/2/4 | 20.0 | Isolated and scalable |
17 | Relay Contacts (two) | A | 0 | 3 | @30 Vdc (level alarm and data valid) |
Physical
No. | Parameter | Units | Min | Max | Comment |
---|---|---|---|---|---|
18 | Ingress Protection | IP65 | For external use | ||
19 | Ambient Operating Temperature | °C | -20 | +55 | Air temperature around the heads |
20 | Operating Humidity | % | 100 | Air humidity around the heads | |
21 | Gas Temperature | °C | +600 |
Heat insulating gaskets included (Higher temperatures on request) | |
22 | Regulatory Compliance |
2014/30/EU (Electromagnetic Radiation) 2014/35/EU (Low Voltage) | |||
23 |
Materials – TRX/Reflector Heads – Air Purge Bodies |
AISI/SAE 316L Stainless steel - Powder coated Powder coated cast aluminium (optional stainless steel version available) | |||
24 | Weight | kg | 2.5 | Head plus air-purge body | |
25 | Warranty | months | 24 | Return to base warranty. Extensions available |
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