BOREAS.usb –  massflow transmitter

Massflow transmitter for the USB port

  • Processor controlled linearization
  • Taring at the push of a button
  • Bidirectional USB communication
  • Power supply via the USB port
  • (optional) 4 … 20mA output
  • 5 selectable units
  • 6 gas standards switchable
  • 9-stage damping
  • Robust metal housing

The USB special edition of the Boreas series was developed especially for use on the USB port of a notebook or tablet.

The BOREAS.usb is a flow transmitter based on the calorimetric (thermal) principle, but it is much more compact than the BOREAS.

The “little brother” of the BOREAS comes in a small, robust metal housing and can be controlled and powered by the USB port of a notebook or tablet. It is therefore perfect as a mobile companion for all measuring tasks.

The output of the measured value or the signal transmission / control is effected digitally via the integrated serial-USB converter and can be implemented with free software.
The BOREAS.usb can be operated with various types of devices (notebooks, tablets, smartphones) as well as various operating systems.

For the stationary use of the BOREAS.usb, a version with an external 5V voltage supply is available as an alternative.

By using high-quality 16-bit digital-to-analog converters, the device can be optionally extended by a precise and low-noise 4 … 20 mA current output.

As with “normal” BOREAS, the curve is also digitally linearized at BOREAS.usb and the same excellent accuracy is achieved thanks to state-of-the-art process technology and temperature-compensated sensors.

The device can be tared at the push of a button, using software and for versions with external voltage supply (and / or 4 … 20mA signal output) also via an externally connected push-button.
The adjustable 9-stage damping serves to calm the display in the case of unsteady or pulsating flows.

The devices of the BOREAS-usb series are calibrated according to DIN1343 with air (0 ° C and 1013mbar), but a total of six different gas standards can be selected via software.

Whether as a handy, mobile companion or stationary, the BOREAS.usb delivers the best results with the smallest dimensions and we call it your “Swiss Army knife” among the portable flowmeters.

General specifications

Device name

Model name

Order number



Measuring ranges
  • 10 Nml/min
  • 20 Nml/min
  • 30 Nml/min
  • 100 Nml/min
  • 200 Nml/min
  • 300 Nml/min
  • 1000 Nml/min
  • 2000 Nml/min
  • 3000 Nml/min
Accuracy ± 1% rd. + 0,5% fs.
Dynamics 1:10 (10…100%)
Resolution (switchable)

0,001 / 0,01 Nml/min

0,01 / 0,1 Nml/min

0,1 / 1 Nml/min

up to 30 Nml/min

up to 300 Nml/min

up to 3000 Nml/min

Additional selectable units l/h, cm³/min, cm³/sec, in³/min
Adjustable gas standards
  • Din 1343 – (1013mbar / 0°C)
  • Din 102 – (981mbar / 20°C)
  • 936mbar / 20°C
  • 1013mbar / 20°C
  • 760mmHg / 25°C
  • ISO 2533 – (1013mbar / 15°C)
Sensor technology

Unidirectional sensor,

temperature compensated

Flow direction

Only positive flow

Calibrated at DIN 1343


Signal outputs
Current output (optional) 4…20mA – unidirectional sensor
Digital output

USB serial converter integrated,

bidirectional communication


Power supply
Power supply

5V DC / regulated, via USB port

Optional via 4 pin connector

Power consumption

Typical 85mA

plus current output

Electrical connection
  • Mini-USB (standard)

  • 4 pin. connector (optional)





Operating limits
Temperature range 0…50°C
Max. permissible flow 20 l/min
Max. permissible both side pressure
  • 25 PSI
  • 100 PSI – optional*
Warm-up time 30 min min for optimal results
Medium Air and dry, non corrosive gases


USB interface
USB port USB type B / mini
Transmission parameters

Baud rate: 9600

Data bits: 8

Stop bits: 1

Parity: none

Flow control: Xon / Xoff


Mechanical properties
Pressure connections

Hose connection with union nut:

  • 6/4 (4mm inside) – standard

Plug-in hose connection:

  • 6/4 (4mm inside)
Dimensions 114 x 55 x 30 mm
Weight 160 g
Enclosure material Aluminium
Mounting position Any
Protection class None


Scope of supply
Accessories (included)

USB cable: type A <> Mini type B

* On request (not available for all devices)

Data sheet:

Operating instructions, software and further downloads can be found here.

Current output

4…20mA via 4 pin connector, Binder

type 719

Power supply

External 5V power supply via

4 pin connector, Binder type 719

* On request (not available for all devices)

Questions to the product:

Here are some answers: +49 (0)9082 / 918 2221 or

To the shop / quote: