MIP LM 3086 SE/EPA3 manual, rev2
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16.10.2018
Page 42 / 105
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The best piece of advice is to monitor the below mentioned areas frequently for a couple of months to see
how the unit operates in the installed location and establish a maintenance schedule accordingly.
The following checks will be classified into three categories, daily checks that should be done on a daily basis
or near to it, frequent checks possibly weekly, and infrequent checks possibly monthly.
Every maintenance schedule will need to be adjusted according to historical observations.
5.1.2
DAILY CHECKS
1.
The daily calibrations, both zero and span on the instrument should be monitored for compliance
with the state or federal guidelines. Daily calibrations according to the EPA should be within 3 % of
the target value. This rule has exceptions based on drift tests, and state or local laws.
2.
The window dirt should be checked daily to determine whether the lens and its related components
should be cleaned. Calibrations with window dirt > 4%, are considered to invalidate data as per the
EPA regulations.
3.
Service numbers along with the laser power, and fibre level should be monitored. When either one of
these reaches 20%, an alarm will occur. The fibre will drop before the laser since the zero power is a
function of the laser light. Some signal loss occurs in the fibre link, resulting in a lower zero than laser
reading. As the fibre/laser power approaches 30 %, it’s a good idea to order a fresh laser to avoid a
malfunction of the unit. Lasers should not be ordered until needed since they have a six-month shelf
life. The life span of the laser itself is also somewhat unpredictable, depending on the physical
attributes of the stack. Heat, vibration and a repeated power up and down of the laser will result in a
shorter life span.
5.1.3
PERIODIC CHECKS
1.
The only check that falls into the periodic category is the status of the purge air system whether it is a
customer provided purge air system, or MIP supplied system. Purge air filters should be checked
weekly for cleanliness. If using the MIP system, check both the coarse out filter and the inner canister
filter. Simply banging the filter out is not sufficient if it is found to be dirty. Filter elements should be
replaced when they look dirty. If not, breakthrough may occur potentially damaging the sensitive
electronic
s. If the purge fail light comes on, and there appears to be purge air flowing, it’s likely that
the purge system has lost it’s flow due to either a clogged filter, or a malfunction of the blower
system.
2.
Checking the status buffers should be done once in a while to ensure accurate opacity readings. The
laser replacement procedure details how to do this, what they mean and how to correct them.
Assuring that the buffers are OK will result in a more linear, better operating instrument.
5.1.4
IRREGULAR CHECKS
Irregular checks involve examining areas of the monitor that are less likely to malfunction or collect dust. The
most important area to check is the chopper mirror. This involves disconnecting one of the wires on terminal
block XA3. The pins that provide power are labelled chopper motor. Removing the cover plate and viewing
the chopper mirror with a light will allow you to see if any dirt accumulation has occurred on the mirrors. If
the purge air is operating correctly, there should be little or no dirt accumulation on the mirrors. DO NOT use
alcohol when cleaning these mirrors, use lens cleaner. Don’t try to remove the mirrors or the chopper motor,
it’s easy to re
-install, but very awkward to re-align. The opacity readings depend heavily on the alignment of
the optical bench. This procedure is discussed in Appendix B.