Double pass transmission measurement
Measures 0 ... 100 % opacity
or 10 ... 1,000 mg/m dust (*)
Power utilities
Refineries
Direct continuous measurement across stack
Chemical / Petrochemical
Small, lightweight & low operating costs
Incinerators
Simple installation, commissioning and operation
Cement plants
No moving parts – minimal maintenance
Iron and steel plants
PC based setup, control and data logging
Crematoria
Long-life green LED source
Electrostatic precipitators
High measuring accuracy
Filter bag houses
Opacity or mg/m3
Heat insulator gasket
Green LED light
Stack
Flange
Alignment gasket (rubber)
Heat insulator gasket
←
POWER
→
ALARM CONTACTS
Reflector
→
4 … 20 mA
←→
Modbus
←→
USB
Purge air inlet
1" BSP thread fitting
Purge air inlet
1" BSP thread fitting
DUST MONITORING SYSTEM
(*) after on site calibration according to VDI 2066
DM 401 is the ideal dust monitoring
instrument for continuous monitoring of
flue gas particulates in the
ducts/stacks/chimneys of industrial
combustion.
Flange
Alignment gasket (rubber)
The DM 401 is designed for use in multiple
industries including:
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FEATURES:
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Transceiver
Y-connector
Air filter
Blower weather cover
AIR BLOWER
Both the transceiver and reflector are supplied with
ambient air (blower unit).
This will prevent dust particle deposition on the
optical lenses by continuous purging
with clean ambient air and extend substantially
the maintenance free operation.
TECHNICAL SPECIFICATIONS
DATA SUBJECT TO CHANGE WITHOUT NOTICE
Parameter
Units
Min
Max
Comments
Measurement performance
Path length
flange to flange distance
Flange to flange
feet
Measuring range
user selectable
after on site calibration
Accuracy
Resolution
display resolution
Damping
selectable
Drift with temperature
for every 20°C change
Operation wave length
green LED
Power and air requirements
Units
Min
Max
Comments
Voltage
optional 90 … 240 VAC PSU available
Air supply volume
optimal: 40 m3/h
Air supply pressure
must exceed max stack pressure
inH2O
Air supply fittings
1" BSP thread fitting
Interface options
Units
Min
Max
Comments
RS 485
Modbus RTU
Analog output
isolated and scalable
Relay contacts
level alarm and service alarm
Physical
Units
Min
Max
Comments
Protection class
for outdoor use
Operating temperature
air temperature around equipment
Gas temperature
optional insulators required above 300°C
optional insulators required above 572°F
Dimensions
Units
Comments
Transceiver
153 x 122 x 120
inch
6.02" x 4.8" x 4.72"
Reflector
153 x 122 x 120
inch
6.02" x 4.8" x 4.72"
Weight
2 kg each
lbs.
4.4 lbs. each
Enclosure
die cast aluminum
mmmmkg-4122
100
600
212
1112
1.6439s%nm
VDC
m3/h
mbarmAA°C°F°C-20
+50°F03IP65
500420
200
+24
+24560-2+2
510
540+20.1160-2%%0.512010100
1,000m%
mg/m3
MRU Instruments, Inc.
Houston, Texas 77044
Tel.: (832) 230 - 0155
Fax: (832) 230 - 1553
info@mru-instruments.com
www.mru-instruments.com
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