Sensor Mounting; Optical Path Length Determination - Siemens SITRANS TDL Compact Operating Instructions

In situ laser gas analyzers

Hide thumbs Also See for SITRANS TDL:

Table of Contents

5.3

Sensor mounting

During operation, ambient temperature cannot exceed the values stated in the technical

specifications (Page 52). If the unit is exposed to direct solar radiation, ensure the total

temperature will not exceed the maximum permitted temperature. If these conditiions

cannot be fulfilled, a heat protection must be installed. Depending on local conditions,

solutions may range from installation of a sun shield to operating SITRANS TDL in a cabinet

with controlled environment.

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.

5.3.1

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 AUTOHOTSPOT. 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

Compact Operating Instructions, 05\2023, A5E51659183-AA – revised 03/2024

CAUTION

Purging path length

Measuring path length

Purging path length

Installing/mounting

5.3 Sensor mounting

Table of Contents