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Rosemount™ OPM4001 Opacity Dust Density Monitor - EPA Compliant (Obsolete)
rosemount opm 4001
This product is now obsolete.
Relevant documents and drawings are listed below.
Contact your local Emerson representative for your measurement needs.
Rosemount™ OPM4001 Opacity Dust Density Monitor - EPA Compliant (Obsolete)


Measurement Range
Opacity 0-99.9% or Optical Density 0-2000mg/m3 selectable via matrix or menu in the enhanced controller (only)
Communication Protocol
Modbus – RS485 port
Calibration Options
Manual zero and span calibrate with dedicated zero reflector or Zero with clear stack condition.
CE and UL Listed
Enclosure Rating
Panel mounted IP65/NEMA4X Dimensions 96x96x64 mm (3.8?x3.8´x2.5?). Power 20.4 to 28.8VDC < 10% ripple, 400mA.


  • Digital display instant percent opacity, average percent opacity and time to next calibration
  • 3 User selectable displays (instant opacity, average opacity and optical density)
  • U.S. Environmental Protection Agency (EPA) approved approved zero/span calibration technique
  • Communications Modbus (RS-485 )
  • Sensor location service module digital display for percent correlated opacity, T2, manual zero and span initiate and transceiver current loop test jacks
  • Insensitive to ambient light
  • Double pass optical system
  • Thru-the-lens (TTL) alignment
  • Light source rated for greater than 5 years
  • Electronic modulated light source
  • Two 4-20mA signals for instantaneous opacity, and 6 minute average
  • Calibration cycle control remote, manual and timed