Low Flow Coriolis Mass Flow Meters for Liquid and Gases
The mini CORI-FLOW? Mass Flow Meters and Controllers from Bronkhorst? are precise and compact instruments based on the Coriolis measurement principle. They are designed to address the needs of the low-flow market.
The Bronkhorst? model M14 Mass Flow Meter (MFM) is suitable for highly accurate measurement of gas or liquid flow in the range of 0 to 30 kg/h, which corresponds to 0 to 400 ln/min when used with nitrogen. These instruments can operate at pressures up to 200 bar, with the possibility of higher pressure ratings upon request.
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, as well as a PID controller for optional mass flow control. This control can be achieved by means of a separately mounted control valve or pump.
Technical specifications
| Measurement / control system | |
|---|---|
| Flow rates | Liquid: 0…30 kg/h (nominal flow rate: 10 kg/h); Gas: 0…400 ln/min (N2); Full Scale (FS) value is user-configurable |
| Mass flow accuracy | Liquid: ±0,2% Rd; Gas: ±0,5% Rd |
| Repeatability | ±?0,05?%?of rate ± ?(ZS* x 100/actual flow)% |
| Turndown ratio | up to 1:100 |
| Zero stability (ZS) | < ±?6?g/h (Guaranteed at constant temperature and for unchanging process and environment conditions.) |
| Response time (sensor) | ≤?200?msec |
| Temperature effect | on zero: < 0,5 g/h/°C; on span: < 0,001% Rd/°C; self heating (at zero flow): < 15°C (Depends on flow rate, heat capacity fluid, T amb., T fluid and cooling capacity.) |
| Operating temperature | 0?… 70?°C?; for ATEX Cat.3, Zone 2 max. 50°C |
| Mounting | any position, attitude sensitivity negligible. Instrument to be rigidly bolted to a stiff and heavy mass or construction for guaranteed zero stability. External shocks or vibrations should be avoided. |
| Temperature accuracy | ±?0,5?°C |
| Density accuracy | < ±?5?kg/m??(at full scale flow) |
| Leak integrity, outboard | tested < 2 x 10-9?mbar l/s He |
| Warm-up time | >?30 min?for optimum accuracy |
| Mechanical parts | |
|---|---|
| Sensor | single tube, DN 1.3 |
| Material (wetted parts) | stainless steel 316L or comparable; optional: Hastelloy-C22 |
| Housing | stainless steel 430F |
| Pressure rating (PN) | 200?bar abs?, higher on request |
| Process connections | compression type or face seal (VCR/VCO) couplings, or Tri-Clamp flanges (welded) |
| Seals | metal |
| Weight | 1,1?kg |
| Ingress protection | IP65 (weatherproof) |
| Electrical properties | |
|---|---|
| Power supply | +15…24 Vdc +/- 10% Max. ripple recommended: 50 mV tt |
| Max. power consumption | 3 W |
| Analog output | 0…5 (10) Vdc, min. load impedance > 2 k?; 0 (4)…20 mA (sourcing), max. load impedance < 375 ? |
| Analog setpoint | 0…5 (10) Vdc, min. load impedance > 100 k?; 0 (4)…20 mA (sourcing), max. load impedance ~ 250 ? |
| Digital communication | standard: RS232; options: PROFIBUS DP, DeviceNet?, Modbus RTU or FLOW-BUS |
| Electrical connection | |
|---|---|
| Analog/RS232 | 8-pin DIN (male); |
| PROFIBUS DP | bus: 5-pin M12 (female); power: 8-pin DIN (male); |
| CANopen? / DeviceNet? | 5-pin M12 (male); |
| FLOW-BUS/Modbus-RTU/ASCII | 5-pin M12 (male); |
Technical specifications subject to change without notice.
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