Service Module - Emerson OPM4001 Installation And Operation Manual

I N S T R U C T I O N M A N U A L

SERVICE MODULE

The service module is used to pass signals to and from the transceiver and control unit and display opacity via digital meter, initiate
maintenance zero and span cycles and insertion of external current meter in the transceiver to control unit 4-20mA loop.
OPACITY / T2 - 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.

Energizing and observe the digital meter to test the systems response to
zero % opacity.

Energize in conjunction with the span filter to observe the upscale 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 upscale span calibration point.
NORMAL / TEST - This switch controls the EXTERNAL mA METER connections. In the normal mode the terminals are shorted. In the
test mode the terminals are open and the current loop from the transceiver is interrupted allowing the use of an external current
meter to be placed in series with the transceiver current output. When this is in the test mode position it is considered a
maintenance condition and fault condition. If no current meter is in the test jacks the loop current the control unit will indicate full
scale and the control unit will indicate a Fault.
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