LS32-1500 Liquid Flow Meter Compact Flow Meter for Low Flow Rates Liquid flow rates up to 40 ml/min 20 ms response time Excellent repeatability High chemical compatibility Product Summary Interface Options Digital The LS32-1500 enables precise, non-invasive mea- surements of dynamic liquid flow rates up to 40 ml/min - I2C-Bus bi-directionally. Excellent biocompatibility is ensured by the exclusive use of high-performance stainless steel, For more information on communication, please refer PTFE and PEEK for the wetted parts. The flow path of to page 2 of this document. the LS32-1500 liquid flow sensor is formed by an especially thin-walled, straight tube which assures excellent sensitivity. 1 Sensing Performance Table 1: Performance of LS32-1500 (all data for medium H O, 23C, 1 bar unless otherwise noted) 2 abs Parameter LS32-1500 Unit Full scale flow rate 40 ml/min a Sensor output limit 65 ml/min b 5 % of measured value Accuracy (whichever error is larger) 0.25 % of full scale b 0.5 % of measured value Repeatability (whichever error is larger) 0.025 % of full scale 0.25 % measured value / C Temperature coefficient (additional error per C whichever is larger) 0.00625 % full scale / C c Mounting orientation sensitivity <0.1 % of full scale 20 ms Flow detection response time 63 Response time on power-up 25 ms Operating temperature +5+50 (+41+122) C (F) d Ambient storage temperature -10+60 (+14+140) C (F) Recommended maximum operating pressure 12 (175) bar (psi) Burst pressure 25 (360) bar (psi) a Flow rate at which the sensor output saturates, see section 2 for performance specification between full scale and saturation point. b Accuracy respectively repeatability below 20 ml/min. See the charts in section 2 for the accuracy respectively repeatability specifications between 20 ml/min and full scale. c Maximum additional offset when flow channel is vertical. d Non-condensing, flow path empty. www.sensirion.com Version 5 January 2017 1/4 2 Specifications Charts Figure 1: Sensor accuracy and repeatability (% of Figure 2: Sensor accuracy and repeatability (ml/min) measured value) across the sensors flow range across the sensors flow range 3 Communication with the Sensor The OEM flow sensor LS32-1500 shows bidirectional, linear transfer characteristics. The product comes 3.3 Digital Communication via IC-Bus fully calibrated for water. Digital communication between a master and the LS32-1500 sensor runs via the standard IC-interface. Digital sampling time, 16 bit 74 ms The physical interface consists of two bus lines, a Digital sampling time, 9 bit 1 ms data line (SDA) and a clock line (SCL) which need to be connected via pull-up resistors to the bus voltage 2 of the system. By default, the I C address is set to 64 3.1 Electrical Specifications (hexadecimal: 40, binary: 1000000). Table 2: DC Characteristics These lines can be used on 3.3V or 5.0V level with a Parameter Conditions Min. Typ. Max. Units clock frequency of 100 kHz. For the detailed Power supply 4.0 5.0 6 V specifications of this IC communication, please refer DC, VDD to specific IC Application Notes from Sensirion. Operating VDD = 4.0-5.5 V 5.1 mA current 3.2 Electrical Connector and Sensor Pinout Connector Type: PCB Header Molex 4 Pin Vertical Art.-No. 0533980471. Pin 1 SCL (bi-directional) 2 VDD 3 GND 4 SDA www.sensirion.com Version 5 January 2017 2/4