Description
2.5 Functional description
SITRANS SL
26 Operating Instructions, 12/2010, A5E01132948-04
Purging
The easiest way to avoid condensation and dust deposits on the sensor windows is to purge
them, e.g. with air. Purging must be selected depending on the application. The transmitted-
light sensors can therefore be configured for the respective situation.
The purging gas must not contain any concentrations of the measurement component. The
presence of the gas in the sensor heads or the purging tubes may influence the measured
concentration.
Recommendations for suitable purging and quality requirements of the purging gases can be
obtained from chapter Technical data (Page 181)
① Purging tube ⑤ Transmitter or receiver unit: optics tube
② Process flange (customer) ⑥ Transmitter or receiver unit: sensor head
③ Inlet for purging on the process side ⑦ Inlet for purging on sensor side if applicable
④ Outlet for purging on sensor side
if applicable
⑧ Process interface
Figure 2-9 Arrangement for purging on the sensor side of the SITRANS SL
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