Siemens SITRANS SL Información Del Producto

Continuous Gas Analysis
SITRANS SL In-situ Laser Gas Analyzers
Amendment 2 to Operating Instructions SITRANS SL
Version 04
Product Information
Introduction
Introduction
This amendment contains necessary information to the following paragraphs of the Operating Instructions A5E011329xx-04:
● Section 4.5.1
● Section 9.1.1.2
● Section 11.1
To ensure safe operation of this device, make sure you also read the standard operating instructions for the SITRANS SL
laser gas analyzer (A5E011329xx) as of revision 04 whereat 'xx' in this number stands for one of the following languages:
48: English; 49: German; 51: French; 52: Italian; 53: Spanish.
This applies, above all, to the warnings and safety information provided there.
Product Information/Technical Update
Section 4.5.1
Section 4.5.1 - Sensor side purging - is modified to read as follows:
For some applications (e. g. oxygen) purging of the sensors is necessary. In this case a needle valve and an exit aperture
must be mounted on the sensors. The exit aperture is used to build up a slight overpressure inside the sensor to enable the
purging gas to penetrate all relevant areas within a short time during all measurements.
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. In oxygen measurements it is necessary to
purge the sensor with an oxygen free gas, such as nitrogen.
When measuring CO also purging of the sensor may be considered. Normally the CO content in standard air is lower than
the detection limit of SITRANS SL. Nevertheless, the CO content may be higher inside buildings and industrial plants due to
exhalation or combustion processes. In this case sensor purging is necessary.
WARNING
Damage to operating staff
Whenever the sensor heads are to be opened or disconnected from the process interface or the gas tubing make sure that
any overpressure in the sensor heads is removed prior to any work. Opening sensor heads under overpressure may result
in dangerous injuries to the operator.
NOTICE
Damage caused corrosive by process gas
When the sensor purging is connected to the process purging, it may be necessary to use non-return valves to ensure no
process gas can enter the purging gas line in the event of failure of the purging gas supply. This applies especially in the
case of cascaded process and sensor purging where there is otherwise the danger that, for example, corrosive process
gases could enter the sensor enclosure.
© Siemens AG 2019. All rights reserved
A5E47707441A-01, 07/2019
1