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Inline Style Dispersion Flow Meter

SMC inline mass Flowmeters are thermal dispersion type, utilizing the constant temperature difference method of measuring Gas Mass Flow Rate. It contains two reference grade platinum RTD sensors clad in a protective 316 SS sheath. Features include direct mass flow measurement for gases, wide range-ability, low pressure drop, excellent low end sensitivity, and no moving parts. The SMC ATMF series is microprocessor based and does not have any potentiometers. Electronics can be Integral Style, or remote mount with rugged, windowed dual compartment enclosure with local or remote display. Four models are available ranging from the low cost blind meters to the more advanced SP models. 

Process Connections Threaded, Flanged
Process temperature 32 to 392 °F (0 to +200 °C)
Mass Flow rate See model selection guide section
Operating pressure 1000 PSIG (69 barg)
Repeatability ± 0.25% of Full Scale
Flow units Kg/hr, Kg/mn, Kg/s Lbhr, Lb/m Lb/s, NCMH, SCFM, NLPM, SLPM, Mt/s, F/mn, BTU/Hr, BTU/min
Gas temperature effect 0.01% /° C
Accuracy (and linearity) ±[1% of Reading + (.5% FS)] ± 0.2% of Full Scale
Material 316SS as per DIN 1.4571 (AISI 316 Ti)
Linear signal output 0-5 VDC & 4-20 mA
Turn down ratio Over 100:1
Housing Protection NEMA 4,Class 1, Div 1, Groups B, C, & D
Response Time Less than one second
Power requirements 115VAC @, ⅛ A 230VAC @ ⅟₁₆ A24 VDC @ ¼A
Ex-protection II 2 GD EEx d IIC T2 or T3
Pulse Output scalable
Display Parameters Flow, Total flow, Switch settings, Temperature, Elapsed time
Data storage EPROM storage up to 10 years
Relays Two 1-amp, SPDT, User-selectable alarm functions
Signal Interface RS232 & RS485, MODBUS
weight (approximate) - integral type ¼" to 1": 2.2 to 8.8 lbs (1 to 4 Kg)1¼" to 2½": 4.4-6.6 lbs (2-3 Kg)3 and 4": 8.8-11 lbs (4-5 Kg)
Power Consumption 2 Watts or less
NIST traceable Standard for all calibration
Cable (remote version) 300 meters
Wetted materials 316 SS (std) Hastelloy (optional)
weight (approximate) - remote type ¼" to 1": 6.6 to 13.2 lbs (3-6 Kg)1¼" to 2½": 13.2-17.6 lbs (6-8 Kg)3 and 4": 16.8-22 lbs (8-10 KG)
Related Files:
  • Direct mass flow measurement of any gas with actual gas calibration
  • Opto-isolated outputs, with graphic display
  • Tracking of overall gas consumption over a turndown ratio of at least 100:1
  • Up to four independent, switchable flow curves
  • High contrast photo-emissive OLED display with rate, total, temperature and graphic display
  • User-selectable engineering units, dynamically converts the flow rate and total flow
  • Can measure higher velocity than any other thermal mass meter - up to 203 m/s
  • Display calibration milliwatt (mw) for ongoing diagnostics
  • Standard software available multi-curve fit programs
  • Low power dissipation under 2W
  • Flow condioners included with all meters

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