Regin AVDT25N Anleitung

INSTRUCTION
EN
AVDT25N
Read this instruction before
i
installation and wiring of the product.
Consult documentation in all cases where this symbol
is used, in order to fi nd out the nature of the potential
hazards and any actions to be taken
Duct mounted air velocity transmitter
AVDT25N is a duct mounted air velocity transmitter for measuring air
velocity in air handling systems.The air velocity sensor operates on
the hot-wire anemometer principle.
The output can be set to 0...10 V or 4...20 mA.
Different measuring ranges for full output signal can be set to give the
best possible accuracy.
There is a choice of two different response times for the output signal.
Installation
It is important that the unit is mounted so that the direction of the
sensor head opening corresponds to the direction of the air fl ow (an
arrow indicating the fl ow direction is shown inside the housing).
Correct
Air velocity Air velocity
.
Drill a <Ø16 mm hole in the duct wall. For optimal measuring results,
measuring points with turbulent air fl ow should be avoided. Preferably,
measuring should be performed at a distance of 2 duct diameters before
bends and branching and at 6 duct diameters after bends and branching.
Air velocity
Hold the fl ange against the hole and drill fastening holes using the fl ange
as template. Fasten the fl ange.
Mount the sensor stem through the hole in the fl ange and fi x it at desired
depth.
CORRECT
Air velocity
It is also possible to mount the sensor using the screw-pockets in the
sensor housing.
In both cases it is essential to position the sensor so that there can be an
Incorrect
unobstructed, straight airfl ow past the sensor element.
Wiring
<16 mm
60 mm
INCORRECT
Immersion length
30 - 50 % of pipe diameter
AVDT25N
Connect supply voltage and output signal according to the diagram
below.
1 Supply voltage 24 V AC
2 System neutral
3 0...10 V or 4...20 mA
Output
Working range
0...10 m/s
0...15 m/s
0...20 m/s
= factory setting
Response time
= factory setting
The output signal, working range and response time are selected by
the jumpers according to the picture above.
The response time is normally set to 4 seconds. By removing the
jumper it is shortened to 0.7 seconds.
Maintenance
Should the element become very dirty it can be blown clean using a
soft air-jet or be rinsed in isopropyl alcohol.
Jumper
Voltage (U)
= factory setting
Jumper
Current (I)
Jumper
Jumper
Jumper
No jumper
FAST approx. 0.7 s
Jumper
SLOW approx. 4 s
1