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Insertion Style Dispersion Flow Meter

SMC's insertion 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. Its' 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 a rugged, windowed dual compartment enclosure for local or remote displays. Four models are available from the low cost blind meters to the more exotic featured SP models.

Calibration Self Check: The flowmeter has built in diagnostics - a display of the calibration milliwatts (mw) can be used to check the sensor’s operation by being compared to the original reported “zero flow” value noted on meter’s Certificate of Conformance (last few lines) and metallic tag. This convenient in-situ field diagnostic procedure verifies that the original factory calibration hasn’t drifted, shifted, or changed. This “Sensor Functionality and Zero Self Check” also verifies that the sensor is free from contamination, even without inspection.

Process Connections Threaded, Flanged, Ball Valve
Process temperature 32 to 851 °F (0 to +455°C)
Operating pressure 1000 PSIG (69 barg)
Velocity Range 0.23 to 665 feet/second (0.07 to 203 normal meters per second)
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
Gas pressure effect Minor; < ±20% of calibration pressure
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
Weight Integral Ex proof: 8.8 lbs (4.0 kg)Remote Ex proof: 15.4 lbs (7.0 kg)Integral Non-Ex proof: 3.3 lbs (1.5 kg)Remote Non Ex proof: 6.6 lbs (3.0 kg)
Signal Interface RS232 & RS485, MODBUS
Power Consumption 2 Watts or less
NIST traceable Standard for all calibration
Cable (remote version) 300 meters
Wetted materials SS #316 (Hastelloy and Monel optional)
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
  • Hot-tap ball valve kit available

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