Securiton ASD 531, Technical Description

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Mounting
60 / 105 ASD 531, Technical description, T 140 416 en
5.5.8 Creating the sampling holes
The hole diameters for the sampling holes have to be deter-
mined and created by the customer as described in
Sec. 4.4.4.3 and according to the specifications of the
“ASD PipeFlow” calculation software.
The sampling holes must be drilled cleanly so that no burrs or
pressure points result. Use “new” drills with correctly ground
surfaces (
Fig. 25 ).
Whistling noises are a sign that the holes have not been
neatly drilled. If so, the holes should be re-drilled and/or de-
burred.
For space surveillance, the sequence of hole diameters set
out in Sec. 4.4.4.3 and the specifications of the “ASD Pipe-
Flow” calculation software must be observed strictly.
If required, the sampling holes can be made using the special
“sampling hole clips” (see 5.5.9).
Fig. 25 Creating the sampling holes
For equipment monitoring, the sampling holes are drilled in the sampling fixture. The sampling holes are drilled into the sam-
pling fixture in the direction of the air outlet from the object to be monitored. If required, these sampling holes can be fitted with
sampling funnels (Sec. 5.5.10).
5.5.9 Mounting the sampling hole clips and maintenance clips
Possible only with plastic tubes (PVC/ABS)!
At each required position in the sampling pipe drill a hole 8.5
mm in diameter (uniform Ø). The holes are made at right an-
gles, in the centre of the pipe axis (as shown in
Fig. 25 ).
The sampling hole clips are available in various sizes
(Ø 2.0 / 2.5 / 3.0 / 3.5 / 4.0 / 4.5 / 5.0 / 5.5 / 6.0 / 6.5 / 7.0 mm).
To determine the required sampling hole clips, refer to
Sec. 4.4.4.3 and the specifications of the “ASD PipeFlow” cal-
culation software.
The sampling hole clips and the maintenance clips are clipped
onto the sampling tube so they snap into the 8.5 mm borehole,
Fig. 26 .
Fig. 26 Mounting clips
5.5.10 Mounting the sampling funnel
Possible only with plastic tubes (PVC/ABS)!
On objects with a high air-flow rate (strong ventilation), the
sampling holes can be fitted with funnels for optimal smoke
detection.
If forced ventilation is used in rooms and/or on equipment, the
use of sampling funnels is imperative.
The sampling funnels are fastened to the tube and adjusted
on the previously drilled sampling holes,
Fig. 27 .
Fig. 27 Using sampling funnels
Angled hole
Pressure points
Burrs
wrong
correct
Hole not at
pipe centre
If whistling noises,
deburr or countersink
Sampling hole
Sampling
hole
clip
Maintenance
clip
Maintenance
sampling hole,
Ø 8.5 mm
Hole,
Ø 8.5 mm
PVC or ABS
sampling tube
Screws,
M4 x 25
Click pipe clamp
Top part
of funnel
Tube of
sampling fixture
Sampling hole
Bottom part
of funnel Funnel
opening
Funnel opening
Sampling funnel
Support rail