Instruction Manual
IM-105-4000, Rev 1.3
October 2008
OPM 4000
4-4
Remote Calibration
Cycle Acknowledgment
Dry contacts on terminal 4U (common) and 5U (NC) acknowledge when the
calibration is in progress. This contact remains closed until calibration is
completed, i.e. both zero and span.
SERVICE MODULE
The service module is used to:
• Pass signals to and from the transceiver and control unit.
• Display opacity via digital display.
• Initiate maintenance zero and span cycles.
• Insert an external current meter in the transceiver to control unit 4-20
mA loop.
The service module has a digital display for reading opacity from the control
unit and Transmittance
2
(T
2
) from the transceiver. It also has connections for
attaching a meter for troubleshooting or calibration when necessary. Other
switches are provided for initiating zero and span modes during service or
maintenance. If any switch causes the system to read data, other than stack
opacity, the control unit fault alarm system will be energized notifying the
operator. A fault output signal (open transistor collector) is also energized for
use with other alarms or DAS systems, which need to know opacity readings
are not representative of the actual stack opacity and a fault condition exists.
Only two conditions are considered normal operation:
1. Reading opacity
2. Computer or internal clock initiated calibration check cycle
Switches
OPACITY / T
2
This switch selects the display of the stack digital meter. In the opacity mode
the digital displays % opacity from the control unit. In the T
2
mode it is the
signal out of the transceiver in % Transmittance
2
.
OPERATE / ZERO
This switch controls the zero mirror solenoid. In the operate position the mirror
is not in the measuring path and is considered normal operation. When the
mirror solenoid is energized, the mirror is placed in the measurement path
and is considered a maintenance condition, i.e. signal is not representative of
the stack smoke. The control unit will indicate a fault.
• Energize and observe the digital meter to test the system response
to zero % opacity.
• Energize in conjunction with the span filter to observe the up scale
span % opacity calibration point.
OPERATE / SPAN
This switch controls the span filter solenoid. In the operate position the span
filter is not in the measuring path and is considered normal operation. When
the span filter solenoid is energized, the span filter is placed in the
measurement path and is considered a maintenance condition, i.e., signal is
not representative of the stack smoke. The control unit will indicate a Fault.
• Energize in conjunction with the zero mirror to observe the up scale
span calibration point.
Summary of Contents for Rosemount Analytical OPM 4000
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