FLK Gas Sampling System - MPIP - Free

SQ253 Valve Combination
2. Installation
2.1 General information
The valve combination is constructed such that it can be easily mounted on the withdrawal device. If no withdrawal device is
being used, then fixing on a mounting frame is possible. Documentation for this can be requested from the SIEMENS
company in the relevant country.
2.2 Mounting on the withdrawal device
The valve combination is fastened to the four screw bolts provided on the opposite side of the drive motor on the traversing
carriage.
All internal connecting screws on the measuring gas line must be retightened, including the nuts on the condensate vessel
(Figure 2, Item 11). Once the valve combination has been mounted, the hose and cable connections to the withdrawal device
and the electrically heated filter must be made.
Note:
See general operating manual Chapter 2.5, Mounting the probe with withdrawal device.
The joining hardware needed for this is included in the supplied items (supplementary pack). All connections have been
labeled to eliminate confusion.
2.2.1 Hose connections to the withdrawal mechanism
These consist of:
Connections between valve combination and electrically heated filter
• Metal-braided hose with R 3/4" threaded joint at both ends for compressed air for the probe flushing.
• Metal-braided hose with R 1/2" threaded joint at both ends for compressed air for the filter flushing.
• Depending on the measuring gas connection between filter and condensate vessel (Figure 2, Items 11,20):
PTFE pressure hose with union nuts (M16x1.5) on both ends.
TEFLON pipe for high-corrosion version with TEFLON screwed glands.
Note: Special attention should be paid to ensure that the PTFE pressure hose or the TEFLON pipe continuously
slopes down to the condensate vessel.
Connections for the compressed air motor. ( Figure 2, View A. ):
• Compressed air feed line to the pneumatic limit switch connection M16x1.5
Valve combination "P2" to the pneumatic limit switch "R1/P2"
• Return line from pneumatic limit switch connection M16x1.5
Valve combination "A" to the pneumatic limit switch "A"
• Compressed air feed line to the compressed air motor connection M16x1.5
Copyright ® SIEMENS Page 64 04/04