The LG01-2000A family of liquid flow switches from Sensirion are able to detect liquid flow by millilitres per minute (ml/min). It also provides bubble detection.
When the flow rate is more than the desired flow switch point, the output signal is 5 V. If the flow rate is lower than this point the output signal is 0 V. This is also the case for when air/bubbles are sensed within the sensor’s flow channel.
This non-invasive liquid flow switch has a straight glass capillary flow path. This also enables chemical resistance and bio-compatibility.
An additional Connectivity Kit can be purchased separately for the LG01 liquid flow switches.

Features of the LG01 liquid flow switches:
Flow switch & bubble detector
Non-invasive
Fast response time (100 ms)
Operating temperature: +10 to +50 °C

LG01-2000A090 switching point: 4.5 ml/min
LG01-2000A005 switching point: 0.25 ml/min

Part numbers:
8986738 - LG01-2000A005 / 1-100797-01
8986731 - LG01-2000A090 / 1-100796-01