I N S T R U C T I O N M A N U A L R E V 4 . 2
7
RCU
The RCU provides instrument control functions, opacity readings, alarms, analog outputs,
communications, system information and more. The color 5x7” viewing screen can be seen in
low light levels and bright. The RCU is rated NEMA 4X/IP65 when panel mounted. Battery backup
for all memory is typically 7 years.
The control unit should be mounted in a control room environment i.e., clean, temperature with
max/min of +0
o
to +50
o
C (+32
o
to + 122
o
F). The OPM4001 ENHANCED control unit provides
instrument control functions, opacity readings, alarm and fault indicators, analog outputs, and
diagnostics with contact closures.
OPTIONAL AIR PURGE W EATHER 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
temperatures limits, and errant air currents around the stack.
The air purge system constantly circulates air past the optical window. The air flow is directed
through the hose to an air plenum on the stack side of the optical window. The air flow 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 OPM4001 ENHANCED 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.
CABLING
The standard cabling used between the stack-mounted units and the control unit is at a minimum 6-pair, #20 AWG, twisted,
shielded. Separation distances approximately 1000FT, more pairs or larger gage than 20 AWG is also acceptable.
