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
  • Local display with capacitive touchscreen
  • IP66/IP67 rating
  • Pressure rating 100 bar


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Low-Flow Ultrasonic Flow Meters for Liquids

ES-FLOW™ model ES-113I Liquid Flow Meters (LFMs) are suited for precise measurement of volume flow ranges between 4 and 1500 ml/min. 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-113I has orbitally welded compression type connections, making this instrument suitable for operating pressures up to 100 bar.

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 or FLOW-BUS protocols.

Technical specifications

Measurement  / Control system
Minimum full scale flow 200 ml/min
Maximum full scale flow 1500 ml/min
Minimum flow 4 ml/min
Volume flow accuracy ±1% Rd ± 1 ml/min
Repeatability ≤ 0.1% Rd ± 0.05 ml/min
Turndown ratio

analog: 1:50 (2...100%);
digital 4:200 up to 4:1500 ml/min;
full scale value scalable by the user


liquids with sound speed between 1000 and 2000 m/s;
fluid independent measurement; also suitable for non-conductive fluids 

Response time  ≤200 msec (meter, t98%)
Refresh (cycle) time ≤10 msec
Ambient temperature 10…60°C
Fluid temperature -10…90°C
Fluid temperature accuracy ±1 °C
Attitude sensitivity negligible; mounting in any position
Warm-up time approx. 1/2 hour after power up for optimum performance
Mechanical parts
Material (wetted parts) Stainless steel 316L
Surface roughness (wetted parts) Ra < 0,8 μm
Sensor Straight tube
Process connections (welded) 3 mm, 6 mm, 1/8”, 1/4” OD compression type or 1/4”face seal male
Seals (internal) None

Meter: 1,3 kg;
Controller: on request

Ingress protection (housing) IP66 and IP67
Pressure rating 10 bara at TAMB = 15...35°C, |TAMB - TMED| ≤ 25°C; for elevated temperatures please consult factory
Electrical properties
Power supply +15…24 Vdc ±10% Max. ripple recommended: 50 mV tt
Power consumption Max. 2.8 W
Analog output 0…5 (10) Vdc, min. load impedance > 2 kΩ; 0 (4)…20 mA (sourcing), max. load impedance < 375 Ω
Analog setpoint 0…5 (10) Vdc, min. load impedance > 100 kΩ; 0 (4)…20 mA, load impedance ~100 Ω
Customized I/O
(Pin 5 options)
Analog control signal output: 0...10 Vdc or 4...20 mA;
Pulse output
Digital communication Standard RS232; Options: CANopen®, DeviceNet™, PROFIBUS DP, PROFINET, Modbus or FLOW-BUS
Electrical connections
Analog/RS232 M12 connector (male)
PROFIBUS DP bus: M12 connector (female); power: M12 connector (male)
CANopen/DeviceNet 5-pin M12 connector (male)
Modbus (RTU/ASCII)/FLOW-BUS M12 connector (male)
Approvals / Certificate
Food contact EC 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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