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Air-flow transducer

Air-flow transducer
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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~. 7132020003 04

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32.020/2 SVU Sauter Components Wiring diagram Dimension drawing Example of application Air speed is kept constant regardless of the amount that the sash is opened. 1 Volume-flow controller 5 VAV return-air controller for 8 Manual damper 2 Damper drive fume cupboards 9 Room-temperature controller 3 Reducing box 6 Air-flow transducer 10 Air-volume adding unit 7 Monitoring unit EY Control centre, night mode, collective alarm Printed in Switzerland Right of amendment reserved N.B.: A comma between cardinal numbers denotes a decimal point © Fr. Sauter AG, CH-4016 Basle 7132020003 04 3 1 2 10 5 6...

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Air-flow transducer 2Pages

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Air-flow transducer
2Pages