FLK Gas Sampling System - MPIP - Free

SQ250 FLK Gas Sampling System
It should be ensured that the connection between the probe and the connection point with the probe inserted always slopes
down ( no collection of condensate in "water pockets"). Also further on, the pipe must be laid as already stated either rising
or falling towards the analysis device.
With special analyses, such as for example SO 2 , a heated measuring gas line regulated thermostatically to approx. >150°C
must be used. This line is then directly connected to the measuring gas output of the heated filter. It must be fixed with
mounting clamps at the connection point and routed further up to the analysis equipment.
Secure all hose connections with hose clamps (e.g. Norma or UNEX K010 Hose Connectors).
To prevent mechanical damage, the measuring line can be laid in steel conduit or plastic ducting. It should be ensured that
edges are rounded off or fitted with plastic edging.
At points where there is a risk of frost the measuring line should be laid in an insulated plastic duct running in parallel with a
heater pipe. The heater must be designed such that the measuring gas line (e.g. plastic pipe) is not damaged, but freezing is
not possible.
Keep the length and internal diameter (ID) of the measuring line as small as possible in order to prevent unnecessary dead
time in the measurement; the display delay is dependent on the measuring gas flow (Figure 6) and on the length of the pipe
(Figure 7).
When laying the measuring gas lines, ensure absolute tightness of sealing, because otherwise extraneous air drawn in by the
negative pressure will give erroneous measurements.
Measuring gas
flow
For 1m gas line before the gas analysis device
4 mm ID 7 mm ID 10 mm ID
l/min sec. sec. sec.
1,5
1,6
4,8
9,6
c
1,0
0,8
2,4
4,8
b
1,5
0,6
1,6
3,2
a
2,0
0,4
1,2
2,4
Legends:
a 4mm ID
b 7mm ID
c 10mm ID
Fig. 6 Display delay in relation to the measuring gas flow
Fig. 7 Display delay in relation to the length of measuring gas line
2.9 Safety measures
It is recommended that the area around the probe, including the traverse path, is closed off and provided with warning signs
about the high temperature (up to 250° C) of the probe, coolant pipe and cooler as well as the automatic traversing.
An emergency-stop button, included in the supplied items, can be fitted within this area, so that when it is operated the
automatic probe traversing is stopped.
Caution: When there is a power failure and a compressed air motor is used, the probe withdraws despite the
EMERGENCY-STOP button being pressed on account of the compressed air.
Copyright ® SIEMENS Page 15 04/04