www.sensirion.com

February 2015 V2

1/4

LG01-2000Axxx

Liquid Flow Switch and Bubble Detector



Detection of low liquid flow in the ml/min Range



Totally non-invasive



Ultra-fast response time of 100 ms

Product Summary

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 point and 0V below this limit or when air

or bubbles are found inside the sensor’s 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.

For more information on communication, please refer

to section 2 of this document.

1 Sensing Performance

Parameter

LG01-2000A090

LG01-2000A005

Unit

4.5

0.25

ml/min

50

220

ml/min

±10

±10

% of switching point

Switching hysteresis

±5

±5

% of switching point

+2

+14

% of switching point

Flow detection response time

50

ms

Response time on power-up

120

ms

Operating temperature

+10…+50

°C

-10…+60

°C

Operating pressure

3

bar

Proof pressure

5

bar

a

Better available on request

b

Maximum shift of switching point if mounted vertically

c

Non-condensing, flow path empty

1.1 Operation with Other Liquids than Water

Due to the measurement principle the LG01 flow switch characteristics is changing with the thermal properties of the

For hydrocarbon liquids such as oil, fuel, or organic solvents, the flow switch point shifts towards higher flow rates.

For indicative purpose, data is provided for isopropyl alcohol (IPA) below.

Table 2: Approximate switch levels of the LG01 liquid flow switch with hydrocarbon liquids

Parameter

LG01-2000A090

LG01-2000A005

Unit

Approximate flow switching point with IPA

9

1.4

ml/min

Maximum flow rate with IPA

>250

>250

ml/min