Installing Process Flanges; Flange Installation - Siemens SITRANS TDL Compact Operating Instructions

In situ laser gas analyzers

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Installing/mounting

5.2 Installing process flanges

5.2.2

Installing process flanges

Note

Prior to the installation of receiver and emitter units, the process flanges must be welded in at

the measurement point and must be compatible with DN50/PN10-40 with the minimum

inner diameter of 50 mm (2.0 in).

The flanges must protrude at least 150 mm (5.9 in) (max. 250 mm (9.8 in)) from the wall and

25 to 40 mm (1.0 to 1.6 in) into the process area. Flange tubes should never be longer than

the purge tube at a standard length of 400 mm (15.7 in). The symmetry axis of the flanges

must align within +-1° to enable optimum (following) alignment of sensors to the optical

axis.

The emitter unit and the receiver unit need to be aligned with respect to the axis of symmetry

of the flange.

① Min. Ø 50 mm (2.0 in)

② DN50 flange

③ Approx. 25 to 40 mm (1.0 to 1.6

④ Max. deviation ± 1°

During the installation of the SITRANS TDL, check that the light from the laser inside the

emitter reaches the photodiode inside the receiver by using the alignment procedure.

5.2.3

Note

Process purging tube optional

Process purging is not a requirement, therefore the purging tube is optional. Depending on

the operation site, process purging may be necessary to achieve stable long term operation.

in)

⑤

DN50 flange

⑥

Dimension A

⑦

Dimension B

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

SITRANS TDL

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