Bronkhorst

EX-FLOW F-211AX

Ex-Proof Mass Flow Controller for Gases

  • ATEX approval Cat.2, Zone 1
  • High accuracy, excellent repeatability
  • Virtually pressure and temperature independent
  • Compact design
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EX-FLOWF-211AX

Intrinsically Safe Gas Mass Flow Controllers for low/medium flow rates

Bronkhorst® EX-FLOW Mass Flow Controllers (MFCs) are suited for precise gas flow control in ATEX Zone 1 hazardous areas. The flow meter part and the control valve of the MFC should be connected (via separate cables) to a power supply with galvanic isolation / preamplifier / readout system (located in the safe zone) which contains a controller board to complete the control loop. See Bronkhorst® E-8000 Series.

EX-FLOW model F-211AX covers flow ranges from 0,1...5 ln/min up to 2...100 ln/min (N2-equivalent) at operating pressures up to 100 bar.

The intrinsically safe measuring head of the flow meter is tested according to ATEX 114 Directive 2014/34/EU and approved under EC-Type Examination Number: KEMA 01ATEX1172, protection II 2 G Ex ib IIC T4 Gb.
The intrinsically safe valve coils are explosion proof certified and available in two options (ATEX certification only):
Coil XB: protection II 1 G Ex ia IIC T6 / protection II 1 D Ex ta IIIC T80°C
Coil XC: protection II 2 G Ex eb IIC T4 / protection II 2 D Ex tb IIIC T130°C


Technical specifications

Measurement / control system
Flow range (intermediate ranges available)min. 0,3…15 mln/min
max. 0,4…20 ln/min
(based on N2)
Accuracy (incl. linearity) (based on actual calibration)± 1 % FS
Repeatability< 2 % RD
Turndown ratio1:50 (2…100%)
Time constant5 sec.
Control stability≤ ± 0,1 % FS typical
Operating temperature-10 … +65 °C
Temperature sensitivityzero: < 0,05% FS/°C; span: < 0,05% Rd/°C
Max. Kv-valueValve with XB-coil: 4,3 x 10-3 /
Valve with XC-coil: 6,6 x 10-2
Leak integrity, outboardtested < 2 x 10-9  mbar l/s He
Attitude sensitivitymax. error at 90° off horizontal 0,2% FS at 1 bar, typical N2
Warm-up time30 min. for optimum accuracy
2 min. for accuracy ± 2% FS
Mechanical parts
Material (wetted parts)Stainless steel 316L or comparable
Pressure rating (PN)100 bar abs
Process connectionscompression type or face seal (VCR/VCO) couplings
Sealsstandard: Viton®;
options: EPDM, Kalrez® (FFKM), FDA and USP Class VI approved compounds
Weight1,7 kg
Ingress protectionIP65
Electrical properties
Signal circuittype of explosion protection: intrinsic safety Ex ib IIC, only for connection to a certified intrinsically safe circuit with the following maximum values:
Ui = 28 V, Ii = 98 mA, Pi = 686 mW
The effective internal capacitance between:
Terminals 1 and 3: Ci = 1 nF;
Effective internal inductance: Li = 0,3 mH
Output signal15 … 20 mA (linear)
I/O signals via PS/Readout (located in safe area)analog: 0…5 Vdc, 0…10 Vdc, 0…20 mA, 4…20 mA;
digital: RS232, PROFIBUS DP, DeviceNet™, Modbus RTU or ASCII, PROFINET, EtherCAT®, FLOW- BUS
XB-coilCoil voltage max. 28 V/110 mA;
295 Ohm at 20°C
XC-coilCoil voltage max. 24 V;
65 Ohm at 20°C, Pmax = 9 W at 20°C
Electrical connection
Ex-proof measuring headTerminal connection, cable gland M16x1,5
Control valve coilcable gland M20x1,5
Control valve options
External actuator options to be connected to the controller
Ex-proof specifications
Approvals / certificates

Technical specifications subject to change without notice.

For dimensional drawings and hook-up diagrams please visit the product page on our website

Downloads

Brochures
EX-FLOW brochure

Manuals
Manual EX-FLOW meters and controllers - ATEX
Manual EX-FLOW meters and controllers - IECEx
Manual EX-FLOW meters and controllers - TIIS
Manual EX-FLOW meters and controllers - KCs

Hook-up diagram
MFM Measuring Head
XB-Coil
XC-Coil

Dimensional drawing
Dimensional drawing F-201AX-F-211AX


Bronkhorst USA inc.

57 South Commerce Way
Suite 120
USA - Bethlehem, PA 18017 
Tel.  +1-610-866-6750
[email protected]

     
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