WAGNER TITANIUS TOP-SENS, Technical Manual

Page: 109 / 250

TITANUS
TOP·SENS
®
/Rev.a
Design
06/13 109
Project planning with air return
In some cases, in which differences of air pressure between the area of air
sampling device and the area of air sampling point exist, a channel of air
pressure of the aspirated test air in the pressure area of air sampling points
can be necessary. Therefore, an air sampling hose with a right length should
be connected on the air outlet of the air sampling device.
As the transport time of an air sampling smoke detection device can be ma-
nipulated negatively by an air return, the influence of the air return to the al-
lowed total length of pipe is to be respected.
An air return with a pipe with Ø 40 mm has no influence and can be pro-
jected and/or retrofitted without reducing the total pipe length and / or retrofit-
ted.
Consideration of air returns:
For calculation the maximum length of air sampling pipe, the length of the air
return must be multiplied by the certain factor and deducted from the allowed
total length of pipe.
Air sampling pipe length = Total pipe length – (Length of the air return * Factor a)
Factors to calculate the lengths of air return (∅ 25 mm):
Length of the
air return
Fan voltage
6.5 V 6.9 V >= 9.0 V
0 to 5 m 0.0 1.3 0.0
> 5 to 10 m 0.8 0.5 0.5
> 10 to 25 m 0.8 0.8 0.5
> 25 to 50 m 0.8 0.8 0.5
Factors to calculate the lengths of air return (∅ 32 mm):
Length of the
air return
Fan voltage
6,5 V 6.9 V >= 9.0 V
0 to 5 m 0.0 0.3 0.0
> 5 to 10 m 0.0 0.3 0.0
> 10 to 25 m 0.2 0.3 0.0
> 25 to 50 m 0.25 0.3 0.1
5.3.8