MIP LM 3086 SE/EPA3 manual, rev2
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16.10.2018
Page 20 / 105
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2.2.3
MAIN MONITORING MODE
This mode is always entered automatically after completion of the diagnostic mode, calibration mode or via a
time-out from other modes. It can also be entered (before the time-out) via pushing buttons from manual,
set-up and service modes.
During the main mode, the opacity values, both real-time and averaged are continuously calculated,
displayed and outputted through the current loops. All alarms are detected and indicated at this time also.
The upper row in the LCD display presents real-time, and average opacity values, changing once per second
for real-time and at the end of the averaging period for the average value. This value is also stored in
memory. (Default average is 6 minutes, can be changed) Pushing the down arrow from the main monitoring
screen will toggle between block averages for opacity, and running average. The EPA requires 6-minute block
averages. There is no direct indication on the screen whether the unit is in block averages or running average
mode. The way to differentiate the two is the create a high opacity reading by closing the shutter, spiking the
instrument to 99.9 % OP. If the average block increases quickly, the unit is in running average, if the average
does not change immediately, the unit is in block average mode.
The default is 6-minute block averages.
The lower display row presents the currently selected instrument range (can be changed) and one of three
options. The first option is a bar graph display showing real-time opacity values. The second is optical density,
and the third is mass emissions. Mass emissions readings must be configured before getting an accurate
value. See paragraph 2.2.5.18 for details on setting the mass coefficient.
The default setting is the bar graph display.
The following modes will be occasionally activated by the internal chip program based on some user applied
settings.
2.2.4
AUTO ZERO MODE
This mode is entered automatically upon initiation of the automatic zero interval.
The zero interval will last for the time period set-up in the service mode (default 30 seconds). See paragraph
2.2.5.10 for details. This is not the same function as pushing the manual zero button on the unit, it is
activated internally by the chip program according to the set calibration interval. Manual calibrations are
described in paragraph 2.2.5.
During the zero cycle, the zero value is checked via the zero pipe optical fibre path, and the resulting value is
compared to the stored zero value from the previous zero calibration cycle. The computed result is shown on
the display and outputted to both current loops. At the end of the zero cycle, the opacity reading that
represents the shift in the zero level is stored in memory for future reference. At the same time the window
compensation value that represents the cumulative sum of all zero shifts is updated and stored as well. The
zero mode indicator LED will illuminate and the corresponding relay will close or open during this cycle
dependent on the relay logic set up (default N/O).