1-100482-01

LG01-2000Axxx Liquid Flow Switch and Bubble Detector Detection 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) LG01-2000A005 LG01-2000A090 Parameter Maximum Flow Rate Flow Switch Limit Accuracya of Switching Point Switching Hysteresis Mounting Orientation Sensitivityb Flow Detection Response Time Response Time On Power-Up Operating Temperature Ambient storage temperature 50 4.5 ±10 ±5 +2 220 0.25 ±10 ±5 +14 50 120 +10…+50 -10…+60 ml/min ml/min % % % ms ms °C °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 LG01-2000A005 LG01-2000A090 Parameter 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 b Better available on request. 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 LG01 Liquid Flow Switch 3 Electrical and Mechanical Specifications 3.1 Electrical Specifications An electrical voltage output indicates flow above (5 V) or below (0 V) the Flow Switch Limit and/or air or bubbles inside the sensors flow channel. The product comes fully calibrated for water – for volume applications flow calibration for other media is available on requestTable 3: DC Characteristics. Parameter Conditions Min. Power Supply DC, VDD 5 Operating Current VDD = 9 V, no load Voltage Output High Voltage Output Low Flow>Flow Switch Limit and no air Flow