mini CORI-FLOW Ex d XM12

Ex-proof Coriolis Mass Flow Meters/Controllers for low flow rates

mini CORI-FLOW Ex d Mass Flow Meters are precise and compact instruments for low flow rates, based on the Coriolis measuring principle, built in an explosion proof housing for use in IECEx and ATEX Zone 1 hazardous areas, ATEX approval II 2 G Ex d e IIB T6 Gb. Bronkhorst^® model XM12 Mass Flow Meter (MFM) is suited for highly accurate measurement of gas or liquid flow ranges between 0,1…5 g/h and 2…200 g/h (which corresponds with 1,33 …66,6 ml_n/min up to 0,03…2,66 l_n/min when used on nitrogen) at operating pressures up to 138 bar (a).

The instrument contains 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 or pump.

Technical specifications

Measurement / control system
Mass flow accuracy	Liquid: ±0,2% of rate; Gas: ±0,5% of rate
Turndown	Meter: up to 1:100; Controller: ≥ 1:50
Repeatability	±0,05% of rate ± ½(ZS* x 100/flow)% based on digital output
Zero Stability (ZS)*	< ±0,02 g/h
Response time, meter (t98%)	≤ 200 msec
Settling time, controller (<2% of setpoint)	1 sec. (typical)
Temperature range	Ambient temperature range: 0...55°C Process temperature range: 0...70°C (Other temperature ranges on request)
Temperature effect**	on zero: < 0,01 g/h/°C; on span: < 0,001% Rd/°C; self heating (at zero flow): ≤ 15°C
Temperature accuracy	±0,5°C
Density accuracy	< ±5 kg/m3
Mounting***	Any position, attitude sensitivity negligible
Leak integrity	Outboard < 2 x 10-9 mbar l/s He
Warm-up time	> 30 min. for optimum accuracy

Mechanical parts
Material (wetted parts)	stainless steel 316L or comparable
Sensor	single tube, DN 0.25
Pressure rating	138 bar abs
Process connections (welded)	1/8" OD compression type; other on request
Seals	metal
Valve seat (controllers)	Kalrez®-6375, other on request
Ingress protection (housing)	IP66

Electrical properties
Power supply	+15…24 Vdc +/- 10% Max. ripple recommended: 50 mV tt
Max. power consumption	Meter: max. 3 W; Controller: max. 7 W
Analog output	0...5 (10) Vdc, min. load impedance > 2 kΩ; 0 (4)...20 mA (sourcing), max. load impedance < 375 Ω; on request: Ex i output 4...20 mA
Analog setpoint (for MFM + pump or control valve)	0...5 (10) Vdc, min. load impedance > 100 kΩ; 0 (4)...20 mA (sourcing), max. load impedance ~ 250 Ω
Digital communication	standard: RS232; options: PROFIBUS DP, DeviceNet™, Modbus RTU or ASCII, FLOW-BUS
Electrical connection	All instrument connections are wired to screw terminals

External actuator options to be connected to the controller
Electromagnetic control valve (Bronkhorst®)	C2I valve with XC coil or XB coil through barrier
Pneumatic actuated control valve (Badger Meter)	RC200 valve with Ex d TEIP11 I/P converter
Mass Flow Meter controlled pump	Pump with ATEX zone 1 U/f converter

Ex-proof specifications
Approvals (MFM)	ATEX:  II 2 G Ex d e IIB T6 Gb             DEKRA 12ATEX0144X IECEx: Ex d e IIB T6 Gb             IECEx DEK 12.0040

* Guaranteed at constant temperature and for unchanging process and environment conditions.
**   Depends on flow rate, heat capacity fluid, T amb., T fluid and cooling capacity.
***  To be rigidly bolted to a stiff and heavy mass or construction for guaranteed zero stability.
External shocks or vibrations should be avoided.
Technical specifications and dimensions subject to change without notice.