Industrial Style Mass Flow Meter for High Gas Flow

  • High accuracy, excellent repeatability
  • Pressure rating 100 bar
  • Virtually pressure and temperature independent
  • Compact design
  • Rugged, weatherproof housing (IP65, dust and waterproof)
  • Industrial Style Gas Mass Flow Meters for high flow rates

    Bronkhorst® model F-116AI Mass Flow Meters (MFMs) are suited for precise measurement of flow ranges between 0,3…15 m3n/h and 4…200 m3n/h at operating pressures up to 100 bar. The MFM consists of a thermal mass flow sensor and a microprocessor based pc-board with signal and fieldbus conversion and a PID controller for optional mass flow control by means of a separately mounted control valve. The IN-FLOW model is of rugged design (IP65) for use in industrial environments or even Zone 2 hazardous areas, with optional ATEX Cat. 3 approval.

    IN-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 DeviceNet™, PROFIBUS DP, Modbus or FLOW-BUS protocols.

Technical specifications

Measurement / control system

Accuracy (incl. linearity)
(based on actual calibration)

±1% FS



Multi fluid capability

storage of max. 8 calibration curves


< 0,2% Rd

Response time

typical: 0,5 seconds

Operating temperature

for ATEX cat. 3 0…50°C

Temperature sensitivity

zero: < 0,05% FS/°C; span: < 0,05% Rd/°C

Pressure sensitivity

0,1% Rd/bar typical N2; 0,01% Rd/bar typical H2

Leak integrity, outboard

tested < 2 x 10-9 mbar l/s He

Attitude sensitivity

max. error at 90° off horizontal 0,2% FS at 1 bar, typical N2

Warm-up time

30 min. for optimum accuracy
2 min for accuracy ± 2% FS


Mechanical parts

Material (wetted parts)

stainless steel 316L or comparable

Pressure rating

100 bar abs

Process connections

compression type or face seal couplings


standard: Viton®; options: EPDM, Kalrez® (FFKM)


5,0 kg

Ingress protection (housing)



Electrical properties

Power supply

+15…24 Vdc

Max. power consumption Meter

15 V
24 V

at voltage I/O
95 mA
65 mA

at current I/O
125 mA
85 mA

Max. power consumption Controller

15 V
24 V

at voltage I/O
290 mA
200 mA

at current I/O
320 mA
215 mA


add 53 mA (15 V supply) or 30 mA (24 V supply)


add 48 mA (24 V supply)

Analog output/command

0...5 (10) Vdc or 0 (4)…20 mA (sourcing output)

Digital communication

standard: RS232;
options: PROFIBUS DP, DeviceNet™, Modbus RTU or ASCII, FLOW-BUS