Maintenance; Cleaning The Window (All Models But Hygienic); Cleaning The Window (Hygienic Model) - ABB LLT100 Operating Instructions Manual

12 Maintenance

The LLT100 is an opto-electronic instrument designed to
withstand many industrial environmental conditions.
It has no moving parts. For this reason, no regular maintenance
is required to keep the instrument in compliance.
NOTICE
The LLT100 does not contain field replaceable parts
(except the O-ring for the hygienic model).
All service or maintenance not explained in this guide is
to be performed at the factory by qualified ABB service
personnel.
Opening the instrument voids the warranty.
However, a few handling precautions will ensure reliable
operation of the instrument for extended periods of time.
– DO NOT DROP THE TRANSMITTER.
– Do not open the transmitter compartment or expose the
internal electronics to water or dirt.
– Do not point the transmitter at the sun.
– Do not open or modify the transmitter.
– Store in a cool dry place.
Before installing the LLT100, it is recommended that you
perform a visual check on the lens. If dust particles are found,
see "Cleaning the window (all models BUT hygienic)" on
page 37.
When installed in a dusty environment, the LLT100 must be
equipped with a dust tube. This will ensure long-term reliability
and performance.
It is recommended to perform periodic inspections of the lens.
The higher the dust level or environmental exposure, the more
frequent these inspections should be.
NOTICE
Always turn the power off before removing or inspecting
the LLT100.

12.1 Cleaning the window (all models BUT hygienic)

The window must be cleaned with caution.
If needed, use dry, clean pressurized air, free of any particulate
or oil vapor, to properly blow dust off the flange window. Use
moderate pressure and adequate personal protection when
performing this operation. Isopropylic alcohol at 99.9% may be
used with clean optical wipes to clean the instrument further.
Avoid contact between the flange glass and any abrasive
material.
NOTICE
When cleaning with air, make sure that the air used is of
instrument grade at ambient temperature and humidity,
and that it is oil free.

12.2 Cleaning the window (hygienic model)

To clean the window of the hygienic model:
1. Remove the four set screws and clean them.
Figure 29 Removing the set screws
Set screws
OI-LLT100-EN Rev. D | User Guide 37