CORI-FLOW™ M54

Low Flow Coriolis Mass Flow Meters / Controllers for Liquid and Gases

CORI-FLOW™ Mass Flow Meters and Controllers are precise and compact instruments, based on the Coriolis measuring principle, designed to cover the needs of the low flow market. Bronkhorst^® model M54 Mass Flow Meter (MFM) is suited for highly accurate measurement of gas or liquid flow ranges between 0,1…10 kg/h and 1…100 kg/h (which corresponds with 1,33…133,3 l_n/min up to 13,3…1333 l_n/min when used on nitrogen) at operating pressures up to 200 bar. The instruments are equipped with a robust IP65 weatherproof housing and are optionally available with ATEX approval for use in Zone 2 hazardous areas.

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	up to 1:100
Repeatability	±0,1% of rate (based on digital output)
Zero Stability (ZS)*	< ±0,05 kg/h
Operating temperature	standard: 0…70°C; max. 50°C for ATEX Cat.3, Zone 2; max. 120°C (ambient+fluid) for special version with remote electronics (130°C ≤ 1 hour allowed for CIP)
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; optional: Hastelloy-C22
Pressure rating	200 bar abs
Process connections (welded)	compression type or face seal couplings
Seals	metal
Ingress protection (housing)	IP65 (weatherproof)

Electrical properties
Power supply	+15…24 Vdc +/- 10% Max. ripple recommended: 50 mV tt
Power consumption	Meter: approx. 80 mA at 15 Vdc
Analog output	0...5 (10) Vdc, min. load impedance > 2 kΩ; 0 (4)...20 mA (sourcing), max. load impedance < 375 Ω
Analog setpoint (for MFM + pump or control valve)	0...5 (10) Vdc, min. load impedance > 424 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
Analog/RS232	8-pin DIN (male);
PROFIBUS DP	bus: 5-pin M12 (female); power: 8-pin DIN (male);
Devicenet™/FLOW-BUS/Modbus	5-pin M12 (male);

Control valve options
M54+C0I: Gas flow control valve	Kv-max= 6,6 x 10-2
M54+C2I: Liquid flow control valve	Kv-max= 2,3 x 10-3
M54+C5I: Gas/Liquid flow control valve	Kv-max= 6,6 x 10-2
M54+F-004AI: Gas/Liquid flow control	Kv-max= 3,0 x 10-1
M54+F-004BI: Gas/Liquid flow control	Kv-max= 1,0

* 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.
***  External shocks or vibrations should be avoided.
Technical specifications and dimensions subject to change without notice.