Instruction manual

38
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Consumption
Description Order no.
Flow direction switch VA 409 0695 0409
Mains unit in wall housing 0554 0108
Connection cable VA/FA Series 400, 5 m with M12 plug 0553 0104
Connection cable VA/FA Series 400, 10 m with M12 plug 0553 0105
VA 409
Flow direction switch for compressed air systems
The new thermal flow direction switch
VA 409 with direction indication serves
for determination of the flow direction of
compressed air and gases especially in
closed circular pipelines.
By means of VA 409 with flow direction
indication the flow direction of the
compressed air can be determined
quickly and safely. Compared with the
former mechanical paddle flow switches
VA 409 is able to detect even the smallest
changes in the flow direction quickly and
without any mechanical movement.
The direction information in form of a
potential-free contact (normally closed
max. 60 VDC, 0.5 A) is transferred to the
consumption sensors VA 400/VA 420 or to
a separate building management system
(mbs). Two LEDs show the flow direction.
In connection with 2 consumption sensors
VA 400/VA 420 incoming and outflowing
compressed air in closed circular pipelines
can be measured precisely.
Special features
 detects smallest changes
< 0.1 m/s referred to 20 °C and
1000 mbar
 no mechanical wear parts
 easy installation under pressure
Technical data VA 409
Detection range < 0.1 m/s referred to
recognition flow 20°C and 1000 mbar
direction:
Measuring principle: calorimetric
measurement
Sensor: Pt 30/Pt 700/Pt 330
Measuring medium: air, gases
Operating temp.: 0...50 °C probe tube
-20...70 °C housing
Operating pressure: up to 16 bar
Power supply: 24 VDC, 40 mA
Power input: max. 80 mA up to
24 VDC
Protection class: IP 54
EMV: acc. to DIN EN 61326
Connection: 2 x M12, 5-pole,
plug A and plug B
2 potential-free 2 x U max. 60 VDC,
contacts: l max 0,5 A (normally
closed); on request:
Normally open
Housing: polycarbonate
Probe tube: stainless steel, 1,4301,
length 160 mm,
Ø 10 mm, safety ring
Ø 11.5 mm, longer
probes on request
Mounting thread: G 1/2”
Diameter housing: 65 mm
Flow direction: 2 LEDs