DM400
Dust Opacity Monitor

Product Description

May 18, 2009

DM400

Measurement Principle

The system consists of an across the stack, double pass measuring transceiver and a reflector unit.

The transceiver uses a high-intensity LED source that emits a beam of light that passes through a diffuser and a beam splitter. Half of the light is directed by a beam splitter to the reflector unit and the reflected light is focused on the measurement detector. The other half of the emitted light is focused on the reference detector. The opacity value is calculated from the ratio of the two detected signals.

Specifications

Technique:	Double pass transmissometer (minimum optical path length of 27” or 0.7m)
Light source:	Long life red LED
Ranges:	User selectable full scale 10 – 100% opacity or 0 – 999 mg/m3 (readings in mg/m3 require on site gravimetric calibration according to VDI-2066 )
Accuracy:	+/- 2%
Resolution:	+/- 0.25%
Repeatability:	+/- 2%
Drift:	< 2% opacity/month
Calibration:	Push buttons for setup, manual zero and span check, linearity check uses glass attenuator filter, single calibration factor for conversion to mg/m3
Display:	4 digit LED type
Stack gas temperature:	Up to 1100° F (600°C)
Humidity in stack:	Gas in stack must be dry - water droplets will prevent opacity readings. Stack gas temperature must be kept above dew point.
Flange temperature:	Up to 390o F (200°C)
Operating temperature:	-4° F to +130o F (-20°C to + 55°C)
Analog output:	4 –20mA
Relay:	2x alarm relays, switchover contacts
Power supply:	90 to 240Vac, 50-60Hz, 10W
Dimensions:	Transceiver: 16” x 5” x 6” (400 x 130 x 160 mm) L x W x D  Reflector: 8” x 5” x 5”  (200 x 130 x 130 mm) L x W x D
Weight:	Total: 15 lbs (7kg)
Enclosure:	Metal case, IP65

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