Low-Flow Ultrasonic Flow Meter for Liquids

  • Fast and accurate measuring signal
  • Low pressure loss due to straight sensor tube
  • Medium independent and temperature insensitive
  • Hygienic design, display with capacitive touchscreen
  • IP66/IP67 rating and CIP cleanable
  • Flanged connection


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Low-Flow Ultrasonic Flow Meters for Liquids

ES-FLOW™ model ES-103I Liquid Flow Meters (LFMs) are suited for precise measurement of volume flow ranges between 4 and 1500 ml/min at operating pressures up to 10 bar. The LFM consists of a innovative ultrasonic flow sensor and an IP66/IP67 protected measuring head with bright LCD display and capacitive touchscreen for adjustment of the settings e.g. for flow indication, alarm, totalisation and control (if applicable). The electronics include a PID controller for optional flow control by means of a separately mounted control valve or pump. ES-FLOW™ model ES-103I has orbitally welded TriClamp flanges for hygienic applications.

Bronkhorst® ES-FLOW™ series are equipped with a digital pc-board, offering high accuracy, excellent temperature stability and fast response. The main digital pc-board contains all of the general functions needed for measurement and control. In addition to the standard RS232 output the instruments also offer analog I/O. As an option, an on-board interface can be mounted to provide CANopen®, DeviceNet™, PROFIBUS DP, PROFINET, Modbus RTU/ASCII or FLOW-BUS protocols.

Technical specifications

Measurement / control system
Minimum full scale flow200 ml/min
Maximum full scale flow1500 ml/min
Minimum flow4 ml/min
Volume flow accuracy±1% Rd ± 1 ml/min
Repeatability≤ 0,1% Rd ± 0,05 ml/min
Turndown ratiodigital 4:200 up to 4:1500 ml/min (full scale value scalable by the user);
analog: 1:50 (2...100%);
Fluidsliquids with sound speed between 1000 and 2000 m/s;
​fluid independent measurement; also suitable for non-conductive fluids
Response time (sensor)200 msec (meter, t98%)
Refresh (cycle) time10 msec
Fluid temperature max-10... 90 °C
Ambient temperature max10... 60 °C
MountingAny position, attitude sensitivity negligible.
Temperature accuracy± 1 °C
Warm-up timeapprox. 1/2 hour after power up for optimum performance
Mechanical parts
SensorStraight tube
Material (wetted parts)Stainless steel 316L
Surface qualityRa < 0,8 μm
Pressure rating (PN) 10 bara at TAMB = 15...35°C, |TAMB - TMED| ≤ 25°C;
for elevated temperatures please consult factory
Process connections1/4” Triclamp flanges (welded);
other on request
Weight Meter: 1,3 kg;
Controller: on request
Ingress protectionIP66 and IP67
Electrical properties
Power supply+ 15... 24 Vdc ±10%; max. ripple recommended: 50 mV tt
Max. power consumption2.8 W
Analog output0…5 (10) Vdc, min. load impedance > 2 kΩ; 0 (4)…20 mA (sourcing), max. load impedance < 375 Ω
Analog setpoint0…5 (10) Vdc, min. load impedance > 100 kΩ; 0 (4)…20 mA, load impedance ~100 Ω
Customised I/OAnalog control signal output: 0...10 Vdc or 4...20 mA;
Pulse output
Digital communicationStandard RS232;
Options: CANopen®, DeviceNet™, PROFIBUS DP, PROFINET, Modbus RTU/ASCII or FLOW-BUS
Electrical connection
Analog/RS232M12 connector (male)
Actuator/Remote display4-pin M8 connector (female)
PROFIBUS DPbus: M12 connector (female); power: M12 connector (male)
CANopen® / DeviceNet™5-pin M12 connector (male)
FLOW-BUS/Modbus-RTU/ASCIIM12 connector (male)
Control valve options
External actuator options to be connected to the controller
Ex-proof specifications
Approvals / certificates
Food contactEC 1935/2004
For dimensional drawings and hook-up diagrams please visit the product page on our website


ES-FLOW brochure
ES-FLOW model key

Manual ES-FLOW

ES-FLOW Series DoC EC1935-2004

Hook-up diagrams
Analog IO - RS232
Optional Bus and IO-Configurations

Dimensional drawing
Dimensional drawing ES-103I-ES-113I

Bronkhorst High-Tech B.V.

Nijverheidsstraat 1A
NL-7261 AK Ruurlo (NL)
Tel. +31 573 45 88 00
[email protected]

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