29 95-87142.2
maintEnancE
WARNING
Do not open cover when an explosive gas
atmosphere may be present.
NOTE
Refer to the LS2000 Safety Manual
(number 95-8727) for specific
requirements and recommendations
applicable to the proper installation,
operation, and maintenance of all
SIL-Certied LS2000 IR gas detectors.
ROUTINE INSPECTION
The LS2000 detector should be inspected
periodically to ensure that external obstructions
such as plastic bags, mud, snow, or other
materials do not block the path and thereby
impair the performance of the device.
OPTICS CLEANING
Cleaning of the LS2000 optical surfaces
is normally required only if an optical fault is
indicated.
Thoroughly douse both window surfaces using a
liberal amount of isopropyl alcohol to clear away
contaminant particles. Repeat the alcohol flush
to remove any remaining contaminants.
WARNING
Bypass/Inhibit: Volatile organic
compounds in cleaning solutions could
cause false alarms.
FUNCTIONAL CHECKING
Functional checks should be performed as
required by site conditions and local regulations.
For specific approval requirements regarding
functional checks, see appendices and the
LS2000 safety manual.
Det-Tronics provides two functional check
options for the LS2000. The test lm method
provides a basic functional check as described
in step 20 of the basic alignment procedure.
Alternatively, the gas test cell method can be
used for a more precise output verification.
The gas cell is typically used to verify the
factory calibration of the LS2000. The gas cell
has a known optical length and has infrared
transparent windows on both ends. When filled
with 100% v/v gas, it contains a specific LFL-M
amount of gas. When the gas cell is placed in
the beam of the detector, the output will rise to a
specific value.
The gas cell is not intended for routine use. It
does, however, demonstrate in a very direct way
the response of the detector to hydrocarbons
along with the resulting control action. This is
particularly useful when required by regulatory
authorities. See the gas cell instruction manual
95-8591 for further details and use instructions.
PROTECTIVE CAPS AND COVERS
Ensure that the wiring compartment cover is
installed and fully engaged.
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