Siemens 6 Series Compact Operating Instructions page 20

Commissioning, operation, maintenance and servicing
6.4 Laser gas analyzers SITRANS SL and LDS 6
NOTICE
Damage to the optics
Always mount the purge device first before installing the sensors to prevent the optical
components from being damaged during the rest of the mounting process. Use sensors
equipped for this particular purge procedure for optimum results. These are available from
Siemens.
NOTICE
Damage due to overpressure during sensor-side purge
If the sensor purge lines are connected to the process purge lines, check valves may need to be
used to ensure that process gas cannot enter the purge line if a purge gas supply fails. This
especially applies to cascaded process and sensor purging, where otherwise there is a risk that
corrosive process gases may enter the sensor housing, for example.
Damage to the optics
The high-pressure glass in the sensors must not be exposed to any mechanical influence that
could lead to scratches or cracks.
• Use only a soft cloth to clean the glass.
• Before cleaning, make sure that the sensor can be dismantled without impairing safety.
20
CAUTION
Compact Operating Instructions, 09/2018, A5E45779403002-01
Safety instructions