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Avoid condensation
As condensation is normally a problem when moving the device from outdoor to the inside of
a building, the device should be adapted to the new ambient conditions for a couple of hours
before starting it.
5.3.2
Optical path length determination
The optical path length is the distance the distance the laser beam passes through the process
gas. Correct optical path length is necessary for proper device performance. User must enter the
actual value of the measuring path length in meters via SITRANS TDL HMI or via the web server.
See parameter Path length (2.3) (Page 117). The measuring path length is defined as the
distance between the ends of purging tubes. In case no purging tubes are installed, the optical
path length is defined by the distance between surfaces of the process flanges.
①
②
③
SITRANS TDL
Operating Instructions, 05/2023, A5E51429088_AA
CAUTION
Purging path length
Measuring path length
Purging path length
Installing/mounting
5.3 Sensor mounting
45
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