Air-flow transducer0 pages

32.020/1
Sauter Components
SVU: Air-flow transducer
How energy efficiency is improved
Enables the demand-led control of air volume in laboratory fume cupboards.
Areas of application
Accurate and long-term stable recording of air influx speeds to laboratory fume cupboards with a time
constant of < 100 ms. Especially suitable for laboratory fume cupboards with horizontal or vertical
sliding front doors.
Features
• Reliable recording of a change in the direction of flow
• Integrated filter unit to prevent contamination of the sensor
• Dynamic pressure sensor using thin-film design
• Quick and easy installation in laboratory fume cupboards
Technical description
• Power supply 24 V~
• Measuring range 0 to1 Pa
• Linearity 2% in relation to output signal
Operation
The temperature-dependent resistors, which are manufactured using thin-film technology, create
radiant heat in their substrate. Because of the air flowing past, the radiant heat is shifted and creates a
differential voltage at the resistors, which are connected so as to form a bridge.
This enables the SVU 100 to detect any reversal in the direction of air flow, i.e. the output voltage
stays at 0 V.
Application SVU 100 F005
The output signal of the flow sensor is fed to the PI controller in the RXE 110 F002 monitoring unit at
the actual-value input. The monitoring unit’s command signal w commands the return-air-volume
controller for fume cupboards. The air volume is regulated within seconds in proportion to the amount
that the fume cupboard’s sash is opened. This ensures that no toxic gases can escape from the fume
cupboard. The output signal reacts linearly to the air speed. The control action is A, i.e. the output
signal rises as the air speed increases.
Additional technical data
Complies with:-
EMC Directive 2004/108/EC EN 61000-6-1/ EN 61000-6-3
Y08201
PD/F
SVU 100 F005
Type Measuring span
m/s
Pressure
difference
Pa
Feature
Power
supply
Weight
kg
SVU 100 F005 0...1,3 1) approx. 0...1 linear to v [m/s] 2) 24 V~ 0,13
Power supply 24 V~ –15% / + 20% , 50...60 Hz Ambient temperature 5–55 °C
Power consumption 1 VA Ambient humidity < 90 %rh
Type of protection IP 40 (EN 60529)
Output signal 3) 0...10 V; load > 500 Ù with terminal cover
Linearity 2% Wiring diagram A08204
Time constant < 1 s Dimension drawing M08203
Air throughput 3 cm3/min (at 1m/s) Fitting instructions MV 505812
1) Recommend measuring span: 0,2...1,3 m/s (output 2...10 V)
2) Stated flow speed is based on ê = 1,2 kg/m³
3) Output is protected against short circuits and excess voltage up to 24 V~.
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