IN-FLOW F-231MI mass flow controller

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 ml_n/min and 0,2…10 l_n/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 ml_n/min max. 0,2…10 l_n/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)

Control valve options

External actuator options to be connected to the controller

Certification for hazardous areas

Approvals / certificates

Downloads

Brochures
IN-FLOW brochure

Manuals
General manual digital instruments
Operating instructions digital instruments

Certificates
ATEX: KEMA 10ATEX0111X
FM approval Class I, Div. 2 (US), FM17US0363X
FM approval Class I, Div. 2 (CA), FM17CA0173X

Hook-up diagrams
Analog IO - RS232
DeviceNet
FLOW-BUS
Modbus RTU/ASCII
PROFIBUS DP
Industrial Ethernet (EtherCAT, EtherNet/IP, Modbus-TCP, POWERLINK, PROFINET)
CANopen
Optional Bus and IO Configurations