INSTRUCTION
AVDT25
i
Instruction for products manufactured from
December 2010. Read this instruction before
installation and wiring of the product.
Consult documentation in all cases where this symbol
is used, in order to find out the nature of the potential
hazards and any actions to be taken
1
AVDT25
Duct mounted air velocity transmitter
AVDT25 is a duct mounted air velocity transmitter for measuring air veloc-
ity in air handling systems.
The output can be set to 0...10 V or 4...20 mA.
Three different measuring ranges for full output signal can be set to give
the best possible accuracy at different air velocities.
Ranges:
0...10 m/s, 0...15 m/s and 0...20 m/s.
There is a choice of two different damping times for the output signal.
Installation
Note:
It is important that the unit is mounted so that the direction of the
sensor head opening corresponds to the direction of the air flow.
Ambient temperature:
-10...+50°C.
Drill a Ø13 mm hole in the duct wall. Hold the flange against the hole
and drill fastening holes using the flange as template. Fasten the flange.
Mount the sensor stem through the hole in the flange and fix it at desired
depth. 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
unobstructed, straight airflow past the sensor element.
Wiring
Connect supply voltage and output signal according to the diagram.
Supply voltage:
24 V AC/DC ±20 %.
Output signals:
0...10 V DC or 4...20 mA corresponding to the chosen
range. Choose range by moving the jumper.
Measuring accuracy:
0...10 m/s: ± (0.3 m/s + 3 % of measured value)
0...15 m/s: ± (0.3 m/s + 3 % of measured value)
0...20 m/s: ± (0.3 m/s + 4 % of measured value)
External load impedance:
> 10 kΩ for 0...10 V output signal.
< 500 Ω for 4...20 mA output signal.
Damping time:
The damping time is normally set to 4 seconds. By re-
moving 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.
EMC emissions & immunity standards
This product conforms to the requirements of the EMC Directive
2004/108/EC through product standards EN 61326-1 and EN 61326-2-3.
RoHS
This product conforms to the Directive 2011/65/EU of the European
Parliament and of the Council.
Contact
AB Regin, Box 116, 428 22 Kållered, Sweden
Tel: +46 31 720 02 00, Fax: +46 31 720 02 50
www.regin.se, [email protected]
3633J
AUG 15
EN
1 Supply voltage 24 V AC
2 System neutral
3 0...10 V or 4...20 mA
The output signal, working range and
response time are selected by the
jumpers according to the picture
t90 HI MED LO I U
t90 HI MED LO I U
t90 HI MED LO I U
t90 HI MED LO I U
t90 HI MED LO I U
t90 HI MED LO I U
t90 HI MED LO I U
Output
Working range
Response time
No jumper
Jumper
Jumper
Jumper
Jumper
FAST
approx. 0.7 s
Jumper
Current (I)
Jumper
Voltage (U)
= factory setting
= factory setting
= factory setting
0...10 m/s
0...15 m/s
0...20 m/s
SLOW approx. 4 s
