Mounting
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ASD 535, Mounting and installation, T 140 333 d en
2.3
Material for the sampling pipe
Notices
Tube materials and fittings must satisfy the requirements of at least Class 1131 of
EN 61386-1
. Document
T 131 194
lists materials that meet this standard; it is part of the device approval of the ASD 535 according to
EN 54-20.
Other materials do not conform to the EN 54-20 standard and may be used only if the manufacturer’s written con-
sent has been obtained and the following conditions are met.
•
Compression resistance
= at least 125 N (EN 61386-1)
•
Shock resistance
= at least 0.5 kg, fall height of 100 mm (EN 61386-1)
•
Temperature range
= at least –15°C to +60°C (EN 61386-1)
•
Tube inner diameter
= 19 to 22 mm
•
Bend radius
= at least 30 mm.
The tube material is available as different plastics and metals. The individual plastic tube parts are usually glued. The flexible
tube material for equipment monitoring is pluggable. The metal tubes are connected by means of press fittings.
The rigid plastic tubes can be shaped by heating them. The tubes can be painted a different colour, whereby attention must be
paid to the chemical compatibility of the paint to the tube.
The following materials are available:
Material
Connection method
PVC (polyvinyl chloride, contains halogen)
Gluing
ABS (acrylonitrile-butadiene styrene, contains no halogen)
Gluing
PA (polyamide, contains no halogen)
Plug-in connection
Copper
Press fitting
Stainless steel
Press fitting
Notices
•
The two materials that use glues (PVC and ABS) must not be combined, since different adhesives are used.
•
Transitions from PVC or ABS to PA materials (flexible tube parts) are possible with special adhesive screw
junctions.
•
PVC produces corrosive and toxic gases if burned or improperly disposed of. The use of PVC materials
should therefore be limited to where it is expressly permitted by the operator of the installation. In applications
where halogen-free plastics are prescribed, ABS or PA materials must be used for laying the sampling pipe.
Country-specific guidelines and regulations must be observed.
•
The adhesives and cleaning agents used for connecting PVC and ABS materials contain solvents and are
combustible. For this reason, prior to working with these materials it is imperative to read and observe the
safety instructions and information provided by the adhesive supplier.
A list of the available
materials for the sampling pipe
(tubes, fittings etc.) for the ASD 535 is available in a separate docu-
ment (
T 131 194
).
Содержание ASD 535
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