IN-FLOW F-231MI
Industrial Style High-Pressure Mass Flow Controller for Gases
♦ High accuracy, excellent repeatability
♦ Fast response
♦ Operating pressure / delta-P up to 400 bar
♦ Compact, rugged design (IP65, dust and waterproof)
♦ Virtually pressure and temperature independent

Industrial Style Gas Mass Flow Controllers for High Pressure / High Delta-P
Bronkhorst® model F-231MI Mass Flow Controllers (MFCs) are suited for accurate measurement and control of flow ranges between 10…500 mln/min and 0,2…10 ln/min with an operating pressure up to 400 bar and max. 400 bar pressure difference (ΔP). The MFC consists of a thermal mass flow sensor, a precise control valve and a microprocessor based pc-board with signal and fieldbus conversion. As a function of a setpoint value, the flow controller swiftly adjusts the desired flow rate. 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 or FM Class I, Div. 2 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 CANopen®, DeviceNet™, EtherCAT®, PROFIBUS DP, PROFINET, Modbus RTU, ASCII or TCP/IP, EtherNet/IP, POWERLINK or FLOW-BUS protocols.
Bronkhorst® model F-231MI Mass Flow Controllers (MFCs) are suited for accurate measurement and control of flow ranges between 10…500 mln/min and 0,2…10 ln/min with an operating pressure up to 400 bar and max. 400 bar pressure difference (ΔP). The MFC consists of a thermal mass flow sensor, a precise control valve and a microprocessor based pc-board with signal and fieldbus conversion. As a function of a setpoint value, the flow controller swiftly adjusts the desired flow rate. 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 or FM Class I, Div. 2 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 CANopen®, DeviceNet™, EtherCAT®, PROFIBUS DP, PROFINET, Modbus RTU, ASCII or TCP/IP, EtherNet/IP, POWERLINK or FLOW-BUS protocols.
Technical specifications
Measurement / control system Flow range (intermediate ranges available) min. 10…500 mln/min
max. 0,2…10 ln/min
(based on N2) Accuracy (incl. linearity) (based on actual calibration) ±0,5% Rd plus ±0,1% FS Repeatability < 0,2 % RD Turndown ratio 1:50 Multi fluid capability Storage of max. 8 calibration curves Settling time (in control, typical) 2 … 4 sec. Control stability < ± 0,1 % FS Operating temperature -10 … +70 °C
for ATEX cat. 3 and FM Class 1 Div 2 : 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% 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 (PN) 400 bar abs Min. ΔP 6 bar dif. Max. ΔP up to 400 bar dif. Process connections compression type or face seal couplings Seals standard: FKM/Viton®;
options: EPDM, FFKM/Kalrez® Weight 3,7 kg Ingress protection IP65
Electrical properties Power supply +15 … 24 Vdc Max. power consumption Supply
15 V
24 V at voltage I/O
290 mA
200 mA at current I/O
320 mA
215 mA extra for fieldbus
<75 mA
<50 mA
Analog output 0…5 (10) Vdc or 0 (4)…20 mA (sourcing output) Digital communication standard: RS232;
options: CANopen®, DeviceNet™, EtherCAT®, PROFIBUS DP, PROFINET, Modbus RTU, ASCII or TCP/IP, EtherNet/IP, POWERLINK or FLOW-BUS
Electrical connection Analog/RS232 8 DIN (male); PROFIBUS DP bus: 5-pin M12 (female);
power: 8 DIN (male); CANopen® / DeviceNet™ 5-pin M12 (male); FLOW-BUS/Modbus-RTU/ASCII 5-pin M12 (male) Modbus TCP / EtherNet/IP / POWERLINK bus: 2 x 5-pin M12 (female) (in/out);
power: 8 DIN (male); EtherCAT®/ PROFINET bus: 2 x 5-pin M12 (female) (in/out);
power: 8 DIN (male) IEC 61010-1 IEC-61010-1:2010 including national deviations for UL (61010-1:2012) and CSA (C22.2 No. 61010-1-12)
Technical specifications subject to change without notice.
Measurement / control system | |
---|---|
Flow range (intermediate ranges available) | min. 10…500 mln/min max. 0,2…10 ln/min (based on N2) |
Accuracy (incl. linearity) (based on actual calibration) | ±0,5% Rd plus ±0,1% FS |
Repeatability | < 0,2 % RD |
Turndown ratio | 1:50 |
Multi fluid capability | Storage of max. 8 calibration curves |
Settling time (in control, typical) | 2 … 4 sec. |
Control stability | < ± 0,1 % FS |
Operating temperature | -10 … +70 °C for ATEX cat. 3 and FM Class 1 Div 2 : 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% 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 (PN) | 400 bar abs |
Min. ΔP | 6 bar dif. |
Max. ΔP | up to 400 bar dif. |
Process connections | compression type or face seal couplings |
Seals | standard: FKM/Viton®; options: EPDM, FFKM/Kalrez® |
Weight | 3,7 kg |
Ingress protection | IP65 |
Electrical properties | |||||
---|---|---|---|---|---|
Power supply | +15 … 24 Vdc | ||||
Max. power consumption |
| ||||
Analog output | 0…5 (10) Vdc or 0 (4)…20 mA (sourcing output) | ||||
Digital communication | standard: RS232; options: CANopen®, DeviceNet™, EtherCAT®, PROFIBUS DP, PROFINET, Modbus RTU, ASCII or TCP/IP, EtherNet/IP, POWERLINK or FLOW-BUS |
Electrical connection | |
---|---|
Analog/RS232 | 8 DIN (male); |
PROFIBUS DP | bus: 5-pin M12 (female); power: 8 DIN (male); |
CANopen® / DeviceNet™ | 5-pin M12 (male); |
FLOW-BUS/Modbus-RTU/ASCII | 5-pin M12 (male) |
Modbus TCP / EtherNet/IP / POWERLINK | bus: 2 x 5-pin M12 (female) (in/out); power: 8 DIN (male); |
EtherCAT®/ PROFINET | bus: 2 x 5-pin M12 (female) (in/out); power: 8 DIN (male) |
IEC 61010-1 | IEC-61010-1:2010 including national deviations for UL (61010-1:2012) and CSA (C22.2 No. 61010-1-12) |
Technical specifications subject to change without notice.