The Sensors; Instruction: Installation Of Sensors - Siemens LDS 6 Operating Instructions Manual

8
2.2

The Sensors

The installation of the ATEX sensors can be performed by the cus-
tomer provided the instructions given in the certificate is fully
observed.
CAUTION
The ATEX certificate is a system certificate and is only valid if LDS 6
is installed according to the instructions given in the certificate.
NOTE
Do not install the sensors unless the purging media is accessible (for
sensors that require purging). Never leave a purged sensor with the
purging switched off since the wedge optics are easily damaged.
The transmitter and the receiver sensors require a process flange.
These have to be welded and aligned at the site before installa-
tion of LDS 6.
At installation of the cross duct sensor, the fibre end and the
photo-detector have to be aligned to the optical axis of the sen-
sor pair. Note that each sensor has an optical axis of its own
which is its axis of symmetry. Normally the process flanges are
mounted with an angle error. The sensors are however, equipped
with a flange pair with a spherical interface. This is used when
the sensor pair is aligned to each other. In this way an angle error
of up to ±2° on each side can be adjusted for.
Installation of Sensors
1. Check that the flanges are installed properly.
2. Mount the sensors, receiver and transmitter, with gaskets on
the flanges and cross-tighten the bolts.
3. Align the sensors as described in the Instruction manual.
NOTE
The stability of the sensor alignment depends on the stability of the
construction to which the customer's flange is mounted. If the incin-
erator wall or smoke duct is subject to movements due to, for
instance, thermal changes the sensors will need repeated realign-
ment. This can be avoided by mounting the sensor pair on an exter-
nal, more stable base, such as concrete or steel support.
Installation Guidelines
ATEX manual for LDS 6
A5E01206710-02