Datasheet Liquid Flow Sensor LG010 pages

LG01-2000Axxx Liquid Flow Switch and Bubble Detector ■ Dtection of low liquid flow in the ml-Range ■ Totally non invasive ■ Ultra fast response time of 100 ms 1 Introduction LG01 The LG01 Liquid Flow Switch enables detection of flow of liquid in the range of ml/min. The output signal is 5V when the flow rate is higher than the specified Flow Switch Limit and 0V below this limit or when air or bubbles are found inside the sensors flow channel instead of liquid. Excellent chemical resistance and bio-compatibility are ensured: The flow path of the LG01 Liquid Flow Switch is formed by a simple, straight glass capillary. 2 Sensing Performance Table 1: Model specific performance of LG01-2000Axxx (all data for medium H2O, 20°C, 1 barabs unless otherwise noted) Parameter LG01-2000A090 LG01-2000A005 Maximum Flow Rate 50 220 ml/min Flow Switch Limit 4.5 0.25 ml/min Accuracya of Switching Point ±10 ±10 % Switching Hysteresis ±5 ±5 % Mounting Orientation Sensitivityb +2 +14 % Flow Detection Response Time 50 ms Response Time On Power-Up 120 ms Operating Temperature +10...+50 °C Ambient storage temperature -10...+60 °C 2.1 Operation with other Liquids than Water Due to the measurement principle the LG01 flow switch characteristics is changing with the thermal properties of the liquid. For aqueous solutions the data above is a good approximation. For hydrocarbon liquids such as oil, fuel, solvents and so on the Flow Switch Limit is increased by the factors below. Table 2: Increase of Flow Switch Level for LG01-2000Axxx using hydrocarbon liquids Parameter LG01-2000A090 LG01-2000A005 Approximate Multiplication Factor for Flow Switch Limit 2 5.5 A Maximum Flow Rate of 250 ml/min and more is possible with hydrocarbon liquids for all LG01-2000Axxx models. a Better available on request. b Shift of switching point if not mounted in normal position (which is horizontal flow channel) but with vertical flow channel. www.sensirion.com May_ 2011 _ V1.3 1/4