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Instruction Manual
IM-105-4000, Original Issue
August 2005
OPM 4000
http://www.raihome.com
Section 1 Description and Specifications
System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1-1
Principle of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1-2
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1-4
SYSTEM OVERVIEW
The OPM 4000 Opacity/Dust Density Monitor provides continuous, low
maintenance, precision measurement of opacity and optical density in
industrial applications. It is a cost-effective instrument that serves as an aid in
operating pollution and/or process control equipment.
Transmissometer/Retro
Reflector
The OPM 4000 is a precision, double-pass, dual beam transmissometer that
consists of a transceiver (transmitter/receiver) mounted on one side of a stack
or duct and a passive reflector mounted on the opposite side. The light
source, photo detectors, and all measurement/reference optics used in
opacity measurement are housed in the transceiver.
The function of the reflector is to return the measurement beam to the
detector in the transceiver, creating a double pass across the process stream.
The standard reflector is used for measurement path lengths up to 15 feet
(4,6 m). For longer path lengths, maximum 60 feet (18,3 m), reflectors, optical
parts and electronics will vary.
Control Unit
Mounted in a control room environment, the OPM 4000 control unit provides
instrument control functions, opacity readings, alarms and fault indicators,
analog outputs, and diagnostics with contact closures.
Optional Air Purge
Weather Cover System
The transceiver and reflector may be mounted in weather covers. The
weather covers are fairly compact to allow movement around them even on a
three-foot walkway or platform. They protect the stack-mounted components
from dirt, moisture, stack temperatures within the specified ambient
temperature limits, and errant air currents around the stack.
The air purge system constantly circulates air past the optical window. The
airflow is directed through the hose to an air plenum on the stack side of the
optical window. The airflow in the air plenum area results in reduced pressure
and increased velocity. This venturi effect tends to continually draw the air
around the optical window into the purge air stream, thereby keeping the lens
clean for long periods.
Alignment System
The OPM 4000 includes a built-in through-the-lens alignment system. The
alignment target can be viewed through a window on the transceiver.
Adjustments to changes in alignment are provided by a 3-point alignment
system, which is integral to the air plenum.