Flange Installation Requirements; Installation Of Flanges - Siemens LDS 6 Operating Instructions Manual

3.5

Flange Installation Requirements

Before the gas analyzer and its sensors can be used, a pair of process flanges should be
installed at the measurement site. The flanges must be installed at a safe and accessible
position to make installation and service easy to accomplish.
The flanges should be welded to the wall of the furnace or funnel as shown in the figure
below.
The flange must protrude at least 100 mm (4") from the wall and 0-30 mm (0-1.2") into the
furnace/funnel.
Figure 3-6
There are applications where furnace walls move due to variations in temperature. If the
furnace walls move the sensors will be miss-aligned and the measurement interrupted. To
overcome this, the sensor can be fixed to a girder or other structure that is not influenced by
the temperature and the flexible metal tube is fitted between the process flange and the
sensor flange. Remember that the flanges fitted for the sensors must not deviate more than
±2°.
Note
It is very important that the flanges are mounted so that they are aligned. Otherwise the
measurements will not be correct.
3.6

Installation of Flanges

When welding the flange tubes it is recommended to have the Flange Alignment Kit. The
Flange Alignment Kit from Siemens consists of a light source, two flanges, an aiming tool
and a battery charger for the light source.
Make sure there is enough room for the sensor. Especially take into consideration that it
should be easy to mount or dismount and that the sensors lid should be able to open fully.
Safe working space around the sensors are also needed, guardrails, ladders, etc. The figure
below illustrates the process for installation of flanges.
LDS 6
Operating Instructions, 01/2009, A5E00295894-05
Sensor CD 6 mounted on a process flange
Installation Guidelines
3.5 Flange Installation Requirements
37