LG01-2000Axxx
Liquid Flow Switch and Bubble Detector
www.sensirion.com May_ 2011 _ V1.3 1/4
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.
Detection of low liquid flow in the ml-Range
Totally non invasive
Ultra fast response time of 100 ms
LG01 Liquid Flow Switch
www.sensirion.com May_ 2011 _ V1.3 2/4
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 request-
Table 3: DC Characteristics.
Parameter
Conditions
Min.
Typ.
Max.
Units
Power Supply DC, VDD
5
7
12a
V
Operating Current
VDD = 9 V, no load
6.8
mA
Voltage Output High
Flow>Flow Switch Limit and no air
5
V
Voltage Output Low
Flow<Flow Switch Limit or air found
0
V
3.2 Electrical Connector and Pinout
Connector type on PCB: 5 pin Molex PCB Header 53261-0590. Mating connector: Molex 51021-0500.
3.3 Mechanical Specifications and Pressure Rating
Inside the LG01 flow sensors a highly sensitive microsensor-chip is mounted on the outside of a straight glass
capillary and allows to measure the flow through the wall (US Patent 6,813,944 B2) using a thermal principle.
Table 4: Mechanical Specifications and Pressure Rating
Parameter
LG01-2000
Fluid Connector Ports (Fittings)
¼-28
for 1/16” or 1/8” OD plastic tubinga
Wetted Materials:
Internal Sensor Capillary Material
Borosilicate Glass 3.3
(Duran®)
Fitting Material
100% PEEK™ (polyetheretherketone)
Additional Sealing Material
ETFE(Tefzel®)
Overpressure Resistance
3 bar
40 psi
Maximum Pressure Drop (at max. flow rate)
1 mbar
Internal Sensor Capillary, Inner Diameter
1.8 mm
Total Internal Volume
<90 µl
Total Mass
6 g
a For fluid connection material use flat bottom ¼-28 standard components e.g. IDEX parts P-200/P-300. Various adapters e.g.
to Barb connectors are available from company Value Plastics as well.
Pin
1
do not connect
2
do not connect
3
VDD
4
GND
5
Voltage Output
Attention Fragile
Forces introduced by stiff fluid connection lines as well as connecting the fittings without
suitable tools causes stress on the internal thin-walled glass capillary.
This can cause it to break! Test for leakage every time after new connections are made.
!
3)
3)
1
2
3
4
5
LG01 Liquid Flow Switch
www.sensirion.com May_ 2011 _ V1.3 3/4
4 Physical Dimensions
5 Connectivity Kit
The optional LG01 connectivity kit contains material
for electrical and fluidic connections.
Assembled flat ribbon cable, 30 mm
(1-100482-01)
2x barb adapter to connect ID 1.6 mm (1/16”)
tubing (Value Plastics ABR004-J1A-2)
2x barb adapter to connect ID 3.2 mm (1/8”)
tubing (Value Plastics ABR013-J1A-1)
6 Ordering Information
The LG01 flow sensors can be ordered for OEM
volume applications.
Product
Article Number
LG01-2000A090
1-100796-01
LG01-2000A005
1-100797-01
LG01 Connectivity Kit
1-100814-01
7 Important Notices
7.1 Warning, personal injury
Do not use this product as safety or emergency
stop devices or in any other application where
failure of the product could result in personal
injury. Do not use this product for applications
other than its intended and authorized use.
Before installing, handling, using or servicing
this product, please consult the data sheet and
application notes. Failure to comply with these
instructions could result in death or serious
injury.
If the Buyer shall purchase or use SENSIRION products
for any unintended or unauthorized application, Buyer
shall defend, indemnify and hold harmless SENSIRION
and its officers, employees, subsidiaries, affiliates and
distributors against all claims, costs, damages and
expenses, and reasonable attorney fees arising out of,
directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use,
even if SENSIRION shall be allegedly negligent with
respect to the design or the manufacture of the product.
7.2 ESD Precautions
The inherent design of this component causes it to be
sensitive to electrostatic discharge (ESD). To prevent ESD-
induced damage and/or degradation, take customary and
statutory ESD precautions when handling this product.
7.3 Warranty
SENSIRION warrants solely to the original purchaser of this
product for a period of 12 months (one year) from the date of
delivery that this product shall be of the quality, material and
workmanship defined in SENSIRION’s published
specifications of the product. Within such period, if proven to
be defective, SENSIRION shall repair and/or replace this
product, in SENSIRION’s discretion, free of charge to the
Buyer, provided that:
notice in writing describing the defects shall be
given to SENSIRION within fourteen (14) days
after their appearance;
such defects shall be found, to SENSIRION’s
reasonable satisfaction, to have arisen from
LG01 Liquid Flow Switch
www.sensirion.com May_ 2011 _ V1.3 4/4
SENSIRION’s faulty design, material, or
workmanship;
the defective product shall be returned to
SENSIRION’s factory at the Buyer’s expense;
and
the warranty period for any repaired or replaced
product shall be limited to the unexpired portion
of the original period.
This warranty does not apply to any equipment which has
not been installed and used within the specifications
recommended by SENSIRION for the intended and proper
use of the equipment. EXCEPT FOR THE WARRANTIES
EXPRESSLY SET FORTH HEREIN, SENSIRION MAKES
NO WARRANTIES, EITHER EXPRESS OR IMPLIED,
WITH RESPECT TO THE PRODUCT. ANY AND ALL
WARRANTIES, INCLUDING WITHOUT LIMITATION,
WARRANTIES OF MERCHANTABILITY OR FITNESS
FOR A PARTICULAR PURPOSE, ARE EXPRESSLY
EXCLUDED AND DECLINED.
SENSIRION is only liable for defects of this product
arising under the conditions of operation provided for in
the data sheet and proper use of the goods. SENSIRION
explicitly disclaims all warranties, express or implied, for
any period during which the goods are operated or stored
not in accordance with the technical specifications.
SENSIRION does not assume any liability arising out of
any application or use of any product or circuit and
specifically disclaims any and all liability, including without
limitation consequential or incidental damages. All
operating parameters, including without limitation
recommended parameters, must be validated for each
customer’s applications by customer’s technical experts.
Recommended parameters can and do vary in different
applications.
SENSIRION reserves the right, without further notice, (i) to
change the product specifications and/or the information in
this document and (ii) to improve reliability, functions and
design of this product.
Copyright© 2001-2009, SENSIRION.
CMOSens® is a trademark of Sensirion
All rights reserved.
PEEK™ is a trademark of Victrex PLC
Teflon® and Tefzel® are registered trademarks
of DuPont Corporation
Duran® is a trademark of the SCHOTT-Group
7.4 RoHS and WEEE Statement
The LG01 product family complies with requirements of
the following directives:
EU Directive 2002/96/EC on waste electrical and
electronic equipment(WEEE), OJ13.02.2003; esp. its
Article 6 (1) with Annex II.
EU Directive 2002/95/EC on the restriction of the use
of certain hazardous substances in electrical and
electronic equipment (RoHS), OJ 13.02.2003; esp. its
Article 4.
Headquarter and Subsidiaries
SENSIRION AG
Laubisruetistr. 50
CH-8712 Staefa ZH
Switzerland
phone: +41 44 306 40 00
fax: +41 44 306 40 30
info@sensirion.com
www.sensirion.com
Sensirion Inc., USA
phone: +1 805 409 4900
info_us@sensirion.com
www.sensirion.com
Sensirion Japan Co. Ltd.
phone: +81 3 3444 4940
info@sensirion.co.jp
www.sensirion.co.jp
Sensirion Korea Co. Ltd.
phone: +82 31 345 0031 3
info@sensirion.co.kr
www.sensirion.co.kr
Sensirion China Co. Ltd.
phone: +86 755 8252 1501
info@sensirion.com.cn
www.sensirion.com.cn
Sensirion AG (Germany)
phone: +41 44 927 11 66
info@sensirion.com
www.sensirion.com
To find your local representative, please visit www.sensirion.com/contact
