Insertion Style Dispersion Flow Meter

  • Insertion Style Thermal Mass Flow Meter
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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.

  • 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
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)
Accuracy (and linearity): ±[1% of Reading + (.5% FS)] ± 0.2% of Full Scale
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
Turn down ratio: Over 100:1
Gas pressure effect: Minor; < ±20% of calibration pressure
Material : 316SS as per DIN 1.4571 (AISI 316 Ti)
Gas temperature effect: 0.01% /° C
Response Time: Less than one second
Housing Protection: NEMA 4,Class 1, Div 1, Groups B, C, & D
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)
Display Parameters: Flow, Total flow, Switch settings, Temperature, Elapsed time
Signal Interface: RS232 & RS485, MODBUS
Ex-protection: II 2 GD EEx d IIC T2 or T3
Cable (remote version): 300 meters
Wetted materials: SS #316 (Hastelloy and Monel optional)
Power requirements : 115VAC @, ⅛ A 230VAC @ ⅟₁₆ A24 VDC @ ¼A
Linear signal output: 0-5 VDC & 4-20 mA
NIST traceable: Standard for all calibration
Data storage: EPROM storage up to 10 years
Pulse Output: scalable
Power Consumption: 2 Watts or less
Relays: Two 1-amp, SPDT, User-selectable alarm functions

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